/src/libxml2/catalog.c

Source
/**
 * catalog.c: set of generic Catalog related routines
 *
 * Reference:  SGML Open Technical Resolution TR9401:1997.
 *             http://www.jclark.com/sp/catalog.htm
 *
 *             XML Catalogs Working Draft 06 August 2001
 *             http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#define IN_LIBXML
#include "libxml.h"

#ifdef LIBXML_CATALOG_ENABLED
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <fcntl.h>
#include <sys/stat.h>

#ifdef _WIN32
  #include <io.h>
#else
  #include <unistd.h>
#endif

#include <libxml/xmlmemory.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/parserInternals.h>
#include <libxml/catalog.h>
#include <libxml/xmlerror.h>
#include <libxml/threads.h>

#include "private/cata.h"
#include "private/buf.h"
#include "private/error.h"
#include "private/memory.h"
#include "private/threads.h"

#define MAX_DELEGATE  50
#define MAX_CATAL_DEPTH 50

#ifdef _WIN32
# define PATH_SEPARATOR ';'
#else
# define PATH_SEPARATOR ':'
#endif

#define XML_URN_PUBID "urn:publicid:"
#define XML_CATAL_BREAK ((xmlChar *) -1)
#ifndef XML_XML_DEFAULT_CATALOG
#define XML_XML_DEFAULT_CATALOG "file://" XML_SYSCONFDIR "/xml/catalog"
#endif

#ifdef LIBXML_SGML_CATALOG_ENABLED
#ifndef XML_SGML_DEFAULT_CATALOG
#define XML_SGML_DEFAULT_CATALOG "file://" XML_SYSCONFDIR "/sgml/catalog"
#endif
#endif

static xmlChar *xmlCatalogNormalizePublic(const xmlChar *pubID);
static int xmlExpandCatalog(xmlCatalogPtr catal, const char *filename, int depth);

/************************************************************************
 *                  *
 *      Types, all private        *
 *                  *
 ************************************************************************/

typedef enum {
    XML_CATA_REMOVED = -1,
    XML_CATA_NONE = 0,
    XML_CATA_CATALOG,
    XML_CATA_BROKEN_CATALOG,
    XML_CATA_NEXT_CATALOG,
    XML_CATA_GROUP,
    XML_CATA_PUBLIC,
    XML_CATA_SYSTEM,
    XML_CATA_REWRITE_SYSTEM,
    XML_CATA_DELEGATE_PUBLIC,
    XML_CATA_DELEGATE_SYSTEM,
    XML_CATA_URI,
    XML_CATA_REWRITE_URI,
    XML_CATA_DELEGATE_URI
#ifdef LIBXML_SGML_CATALOG_ENABLED
    ,
    SGML_CATA_SYSTEM,
    SGML_CATA_PUBLIC,
    SGML_CATA_ENTITY,
    SGML_CATA_PENTITY,
    SGML_CATA_DOCTYPE,
    SGML_CATA_LINKTYPE,
    SGML_CATA_NOTATION,
    SGML_CATA_DELEGATE,
    SGML_CATA_BASE,
    SGML_CATA_CATALOG,
    SGML_CATA_DOCUMENT,
    SGML_CATA_SGMLDECL
#endif
} xmlCatalogEntryType;

typedef struct _xmlCatalogEntry xmlCatalogEntry;
typedef xmlCatalogEntry *xmlCatalogEntryPtr;
struct _xmlCatalogEntry {
    struct _xmlCatalogEntry *next;
    struct _xmlCatalogEntry *parent;
    struct _xmlCatalogEntry *children;
    xmlCatalogEntryType type;
    xmlChar *name;
    xmlChar *value;
    xmlChar *URL;  /* The expanded URL using the base */
    xmlCatalogPrefer prefer;
    int dealloc;
    int depth;
    struct _xmlCatalogEntry *group;
};

typedef enum {
    XML_XML_CATALOG_TYPE = 1
#ifdef LIBXML_SGML_CATALOG_ENABLED
    ,
    XML_SGML_CATALOG_TYPE
#endif
} xmlCatalogType;

#ifdef LIBXML_SGML_CATALOG_ENABLED
#define XML_MAX_SGML_CATA_DEPTH 10
#endif
struct _xmlCatalog {
    xmlCatalogType type;  /* either XML or SGML */

#ifdef LIBXML_SGML_CATALOG_ENABLED
    /*
     * SGML Catalogs are stored as a simple hash table of catalog entries
     * Catalog stack to check against overflows when building the
     * SGML catalog
     */
    char *catalTab[XML_MAX_SGML_CATA_DEPTH];  /* stack of catals */
    int          catalNr; /* Number of current catal streams */
    int          catalMax;  /* Max number of catal streams */
    xmlHashTablePtr sgml;
#endif

    /*
     * XML Catalogs are stored as a tree of Catalog entries
     */
    xmlCatalogPrefer prefer;
    xmlCatalogEntryPtr xml;
};

/************************************************************************
 *                  *
 *      Global variables        *
 *                  *
 ************************************************************************/

/*
 * Those are preferences
 */
static int xmlDebugCatalogs = 0;   /* used for debugging */
static xmlCatalogAllow xmlCatalogDefaultAllow = XML_CATA_ALLOW_ALL;
static xmlCatalogPrefer xmlCatalogDefaultPrefer = XML_CATA_PREFER_PUBLIC;

/*
 * Hash table containing all the trees of XML catalogs parsed by
 * the application.
 */
static xmlHashTablePtr xmlCatalogXMLFiles = NULL;

/*
 * The default catalog in use by the application
 */
static xmlCatalogPtr xmlDefaultCatalog = NULL;

/*
 * A mutex for modifying the shared global catalog(s)
 * xmlDefaultCatalog tree.
 * It also protects xmlCatalogXMLFiles
 * The core of this readers/writer scheme is in #xmlFetchXMLCatalogFile
 */
static xmlRMutex xmlCatalogMutex;

/*
 * Whether the default system catalog was initialized.
 */
static int xmlCatalogInitialized = 0;

/*
 * HashTable to store any resolution query done to a XML_CATA_CATALOG
 * entry to avoid cycles in resolution.
 */
static xmlHashTablePtr xmlCatalogResolveCache = NULL;

/*
 * xmlResetCatalogResolveCache
 * Free the xmlCatalogResolveCache and sets to NULL
 */
static void
xmlResetCatalogResolveCache(void)
{
    xmlRMutexLock(&xmlCatalogMutex);
    if (xmlCatalogResolveCache != NULL) {
        xmlHashFree(xmlCatalogResolveCache, NULL);
        xmlCatalogResolveCache = NULL;
    }
    xmlRMutexUnlock(&xmlCatalogMutex);
}

/*
 * xmlCatalogResolveCacheVisited
 * Check if the url/pubID/sysID combination is present in the
 * xmlCatalogResolveCache, and if not insert it.
 *
 * @param url  The catalog url
 * @param pubID  The pubID resolve filed
 * @param sysID  The sysID resolve filed
 * @returns 1 if already present in the cache, 0 if not
 */
static int
xmlCatalogResolveCacheVisited(const xmlChar *url,
                              const xmlChar *pubID,
                              const xmlChar *sysID)
{
    int ret = 0;
    xmlRMutexLock(&xmlCatalogMutex);
    if (xmlCatalogResolveCache == NULL) {
        xmlCatalogResolveCache = xmlHashCreate(10);
        xmlHashAddEntry3(xmlCatalogResolveCache, url, pubID, sysID, BAD_CAST url);
        xmlRMutexUnlock(&xmlCatalogMutex);
        return 0;
    }

    if (xmlHashLookup3(xmlCatalogResolveCache, url, pubID, sysID)) {
        ret = 1;
    } else {
        xmlHashAddEntry3(xmlCatalogResolveCache, url, pubID, sysID, BAD_CAST url);
        ret = 0;
    }

    xmlRMutexUnlock(&xmlCatalogMutex);
    return ret;
}

/************************************************************************
 *                  *
 *      Catalog error handlers        *
 *                  *
 ************************************************************************/

/**
 * Handle an out of memory condition
 */
static void
xmlCatalogErrMemory(void)
{
    xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_CATALOG, NULL);
}

/**
 * Handle a catalog error
 *
 * @param catal  the Catalog entry
 * @param node  the context node
 * @param error  the error code
 * @param msg  the error message
 * @param str1  error string 1
 * @param str2  error string 2
 * @param str3  error string 3
 */
static void LIBXML_ATTR_FORMAT(4,0)
xmlCatalogErr(xmlCatalogEntryPtr catal, xmlNodePtr node, int error,
               const char *msg, const xmlChar *str1, const xmlChar *str2,
         const xmlChar *str3)
{
    int res;

    res = xmlRaiseError(NULL, NULL, NULL, catal, node,
                        XML_FROM_CATALOG, error, XML_ERR_ERROR, NULL, 0,
                        (const char *) str1, (const char *) str2,
                        (const char *) str3, 0, 0,
                        msg, str1, str2, str3);
    if (res < 0)
        xmlCatalogErrMemory();
}

static void
xmlCatalogPrintDebug(const char *fmt, ...) {
    va_list ap;

    va_start(ap, fmt);
    xmlVPrintErrorMessage(fmt, ap);
    va_end(ap);
}

/************************************************************************
 *                  *
 *      Allocation and Freeing        *
 *                  *
 ************************************************************************/

/**
 * create a new Catalog entry, this type is shared both by XML and
 * SGML catalogs, but the acceptable types values differs.
 *
 * @param type  type of entry
 * @param name  name of the entry
 * @param value  value of the entry
 * @param URL  URL of the entry
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @param group  for members of a group, the group entry
 * @returns the xmlCatalogEntry or NULL in case of error
 */
static xmlCatalogEntryPtr
xmlNewCatalogEntry(xmlCatalogEntryType type, const xmlChar *name,
     const xmlChar *value, const xmlChar *URL, xmlCatalogPrefer prefer,
     xmlCatalogEntryPtr group) {
    xmlCatalogEntryPtr ret;
    xmlChar *normid = NULL;

    ret = (xmlCatalogEntryPtr) xmlMalloc(sizeof(xmlCatalogEntry));
    if (ret == NULL) {
        xmlCatalogErrMemory();
  return(NULL);
    }
    ret->next = NULL;
    ret->parent = NULL;
    ret->children = NULL;
    ret->type = type;
    if (type == XML_CATA_PUBLIC || type == XML_CATA_DELEGATE_PUBLIC) {
        normid = xmlCatalogNormalizePublic(name);
        if (normid != NULL)
            name = (*normid != 0 ? normid : NULL);
    }
    if (name != NULL)
  ret->name = xmlStrdup(name);
    else
  ret->name = NULL;
    if (normid != NULL)
        xmlFree(normid);
    if (value != NULL)
  ret->value = xmlStrdup(value);
    else
  ret->value = NULL;
    if (URL == NULL)
  URL = value;
    if (URL != NULL)
  ret->URL = xmlStrdup(URL);
    else
  ret->URL = NULL;
    ret->prefer = prefer;
    ret->dealloc = 0;
    ret->depth = 0;
    ret->group = group;
    return(ret);
}

static void
xmlFreeCatalogEntryList(xmlCatalogEntryPtr ret);

/**
 * Free the memory allocated to a Catalog entry
 *
 * @param payload  a Catalog entry
 * @param name  unused
 */
static void
xmlFreeCatalogEntry(void *payload, const xmlChar *name ATTRIBUTE_UNUSED) {
    xmlCatalogEntryPtr ret = (xmlCatalogEntryPtr) payload;
    if (ret == NULL)
  return;
    /*
     * Entries stored in the file hash must be deallocated
     * only by the file hash cleaner !
     */
    if (ret->dealloc == 1)
  return;

    if (xmlDebugCatalogs) {
  if (ret->name != NULL)
      xmlCatalogPrintDebug(
        "Free catalog entry %s\n", ret->name);
  else if (ret->value != NULL)
      xmlCatalogPrintDebug(
        "Free catalog entry %s\n", ret->value);
  else
      xmlCatalogPrintDebug(
        "Free catalog entry\n");
    }

    if (ret->name != NULL)
  xmlFree(ret->name);
    if (ret->value != NULL)
  xmlFree(ret->value);
    if (ret->URL != NULL)
  xmlFree(ret->URL);
    xmlFree(ret);
}

/**
 * Free the memory allocated to a full chained list of Catalog entries
 *
 * @param ret  a Catalog entry list
 */
static void
xmlFreeCatalogEntryList(xmlCatalogEntryPtr ret) {
    xmlCatalogEntryPtr next;

    while (ret != NULL) {
  next = ret->next;
  xmlFreeCatalogEntry(ret, NULL);
  ret = next;
    }
}

/**
 * Free the memory allocated to list of Catalog entries from the
 * catalog file hash.
 *
 * @param payload  a Catalog entry list
 * @param name  unused
 */
static void
xmlFreeCatalogHashEntryList(void *payload,
                            const xmlChar *name ATTRIBUTE_UNUSED) {
    xmlCatalogEntryPtr catal = (xmlCatalogEntryPtr) payload;
    xmlCatalogEntryPtr children, next;

    if (catal == NULL)
  return;

    children = catal->children;
    while (children != NULL) {
  next = children->next;
  children->dealloc = 0;
  children->children = NULL;
  xmlFreeCatalogEntry(children, NULL);
  children = next;
    }
    catal->dealloc = 0;
    xmlFreeCatalogEntry(catal, NULL);
}

/**
 * create a new Catalog, this type is shared both by XML and
 * SGML catalogs, but the acceptable types values differs.
 *
 * @param type  type of catalog
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @returns the xmlCatalog or NULL in case of error
 */
static xmlCatalogPtr
xmlCreateNewCatalog(xmlCatalogType type, xmlCatalogPrefer prefer) {
    xmlCatalogPtr ret;

    ret = (xmlCatalogPtr) xmlMalloc(sizeof(xmlCatalog));
    if (ret == NULL) {
        xmlCatalogErrMemory();
  return(NULL);
    }
    memset(ret, 0, sizeof(xmlCatalog));
    ret->type = type;
    ret->prefer = prefer;
#ifdef LIBXML_SGML_CATALOG_ENABLED
    ret->catalNr = 0;
    ret->catalMax = XML_MAX_SGML_CATA_DEPTH;
    if (ret->type == XML_SGML_CATALOG_TYPE)
  ret->sgml = xmlHashCreate(10);
#endif
    return(ret);
}

/**
 * Free the memory allocated to a Catalog
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 */
void
xmlFreeCatalog(xmlCatalog *catal) {
    if (catal == NULL)
  return;
    if (catal->xml != NULL)
  xmlFreeCatalogEntryList(catal->xml);
#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->sgml != NULL)
  xmlHashFree(catal->sgml, xmlFreeCatalogEntry);
#endif
    xmlFree(catal);
}

/************************************************************************
 *                  *
 *      Serializing Catalogs        *
 *                  *
 ************************************************************************/

#ifdef LIBXML_OUTPUT_ENABLED
#ifdef LIBXML_SGML_CATALOG_ENABLED
/**
 * Serialize an SGML Catalog entry
 *
 * @param payload  the catalog entry
 * @param data  the file.
 * @param name  unused
 */
static void
xmlCatalogDumpEntry(void *payload, void *data,
                    const xmlChar *name ATTRIBUTE_UNUSED) {
    xmlCatalogEntryPtr entry = (xmlCatalogEntryPtr) payload;
    FILE *out = (FILE *) data;
    if ((entry == NULL) || (out == NULL))
  return;
    switch (entry->type) {
  case SGML_CATA_ENTITY:
      fprintf(out, "ENTITY "); break;
  case SGML_CATA_PENTITY:
      fprintf(out, "ENTITY %%"); break;
  case SGML_CATA_DOCTYPE:
      fprintf(out, "DOCTYPE "); break;
  case SGML_CATA_LINKTYPE:
      fprintf(out, "LINKTYPE "); break;
  case SGML_CATA_NOTATION:
      fprintf(out, "NOTATION "); break;
  case SGML_CATA_PUBLIC:
      fprintf(out, "PUBLIC "); break;
  case SGML_CATA_SYSTEM:
      fprintf(out, "SYSTEM "); break;
  case SGML_CATA_DELEGATE:
      fprintf(out, "DELEGATE "); break;
  case SGML_CATA_BASE:
      fprintf(out, "BASE "); break;
  case SGML_CATA_CATALOG:
      fprintf(out, "CATALOG "); break;
  case SGML_CATA_DOCUMENT:
      fprintf(out, "DOCUMENT "); break;
  case SGML_CATA_SGMLDECL:
      fprintf(out, "SGMLDECL "); break;
  default:
      return;
    }
    switch (entry->type) {
  case SGML_CATA_ENTITY:
  case SGML_CATA_PENTITY:
  case SGML_CATA_DOCTYPE:
  case SGML_CATA_LINKTYPE:
  case SGML_CATA_NOTATION:
      fprintf(out, "%s", (const char *) entry->name); break;
  case SGML_CATA_PUBLIC:
  case SGML_CATA_SYSTEM:
  case SGML_CATA_SGMLDECL:
  case SGML_CATA_DOCUMENT:
  case SGML_CATA_CATALOG:
  case SGML_CATA_BASE:
  case SGML_CATA_DELEGATE:
      fprintf(out, "\"%s\"", entry->name); break;
  default:
      break;
    }
    switch (entry->type) {
  case SGML_CATA_ENTITY:
  case SGML_CATA_PENTITY:
  case SGML_CATA_DOCTYPE:
  case SGML_CATA_LINKTYPE:
  case SGML_CATA_NOTATION:
  case SGML_CATA_PUBLIC:
  case SGML_CATA_SYSTEM:
  case SGML_CATA_DELEGATE:
      fprintf(out, " \"%s\"", entry->value); break;
  default:
      break;
    }
    fprintf(out, "\n");
}
#endif /* LIBXML_SGML_CATALOG_ENABLED */

/**
 * Serializes a Catalog entry, called by xmlDumpXMLCatalog and recursively
 * for group entries
 *
 * @param catal  top catalog entry
 * @param catalog  pointer to the xml tree
 * @param doc  the containing document
 * @param ns  the current namespace
 * @param cgroup  group node for group members
 */
static void xmlDumpXMLCatalogNode(xmlCatalogEntryPtr catal, xmlNodePtr catalog,
        xmlDocPtr doc, xmlNsPtr ns, xmlCatalogEntryPtr cgroup) {
    xmlNodePtr node;
    xmlCatalogEntryPtr cur;
    /*
     * add all the catalog entries
     */
    cur = catal;
    while (cur != NULL) {
        if (cur->group == cgroup) {
      switch (cur->type) {
          case XML_CATA_REMOVED:
        break;
          case XML_CATA_BROKEN_CATALOG:
          case XML_CATA_CATALOG:
        if (cur == catal) {
      cur = cur->children;
            continue;
        }
        break;
    case XML_CATA_NEXT_CATALOG:
        node = xmlNewDocNode(doc, ns, BAD_CAST "nextCatalog", NULL);
        xmlSetProp(node, BAD_CAST "catalog", cur->value);
        xmlAddChild(catalog, node);
                    break;
    case XML_CATA_NONE:
        break;
    case XML_CATA_GROUP:
        node = xmlNewDocNode(doc, ns, BAD_CAST "group", NULL);
        xmlSetProp(node, BAD_CAST "id", cur->name);
        if (cur->value != NULL) {
            xmlNsPtr xns;
      xns = xmlSearchNsByHref(doc, node, XML_XML_NAMESPACE);
      if (xns != NULL)
          xmlSetNsProp(node, xns, BAD_CAST "base",
           cur->value);
        }
        switch (cur->prefer) {
      case XML_CATA_PREFER_NONE:
                break;
      case XML_CATA_PREFER_PUBLIC:
                xmlSetProp(node, BAD_CAST "prefer", BAD_CAST "public");
          break;
      case XML_CATA_PREFER_SYSTEM:
                xmlSetProp(node, BAD_CAST "prefer", BAD_CAST "system");
          break;
        }
        xmlDumpXMLCatalogNode(cur->next, node, doc, ns, cur);
        xmlAddChild(catalog, node);
              break;
    case XML_CATA_PUBLIC:
        node = xmlNewDocNode(doc, ns, BAD_CAST "public", NULL);
        xmlSetProp(node, BAD_CAST "publicId", cur->name);
        xmlSetProp(node, BAD_CAST "uri", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_SYSTEM:
        node = xmlNewDocNode(doc, ns, BAD_CAST "system", NULL);
        xmlSetProp(node, BAD_CAST "systemId", cur->name);
        xmlSetProp(node, BAD_CAST "uri", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_REWRITE_SYSTEM:
        node = xmlNewDocNode(doc, ns, BAD_CAST "rewriteSystem", NULL);
        xmlSetProp(node, BAD_CAST "systemIdStartString", cur->name);
        xmlSetProp(node, BAD_CAST "rewritePrefix", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_DELEGATE_PUBLIC:
        node = xmlNewDocNode(doc, ns, BAD_CAST "delegatePublic", NULL);
        xmlSetProp(node, BAD_CAST "publicIdStartString", cur->name);
        xmlSetProp(node, BAD_CAST "catalog", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_DELEGATE_SYSTEM:
        node = xmlNewDocNode(doc, ns, BAD_CAST "delegateSystem", NULL);
        xmlSetProp(node, BAD_CAST "systemIdStartString", cur->name);
        xmlSetProp(node, BAD_CAST "catalog", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_URI:
        node = xmlNewDocNode(doc, ns, BAD_CAST "uri", NULL);
        xmlSetProp(node, BAD_CAST "name", cur->name);
        xmlSetProp(node, BAD_CAST "uri", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_REWRITE_URI:
        node = xmlNewDocNode(doc, ns, BAD_CAST "rewriteURI", NULL);
        xmlSetProp(node, BAD_CAST "uriStartString", cur->name);
        xmlSetProp(node, BAD_CAST "rewritePrefix", cur->value);
        xmlAddChild(catalog, node);
        break;
    case XML_CATA_DELEGATE_URI:
        node = xmlNewDocNode(doc, ns, BAD_CAST "delegateURI", NULL);
        xmlSetProp(node, BAD_CAST "uriStartString", cur->name);
        xmlSetProp(node, BAD_CAST "catalog", cur->value);
        xmlAddChild(catalog, node);
        break;
                default:
        break;
      }
        }
  cur = cur->next;
    }
}

static xmlDocPtr
xmlDumpXMLCatalogToDoc(xmlCatalogEntryPtr catal) {
    xmlNsPtr ns;
    xmlDtdPtr dtd;
    xmlNodePtr catalog;
    xmlDocPtr doc = xmlNewDoc(NULL);
    if (doc == NULL) {
        return(NULL);
    }

    dtd = xmlNewDtd(doc, BAD_CAST "catalog",
                    BAD_CAST "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN",
                    BAD_CAST "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd");

    xmlAddChild((xmlNodePtr) doc, (xmlNodePtr) dtd);

    ns = xmlNewNs(NULL, XML_CATALOGS_NAMESPACE, NULL);
    if (ns == NULL) {
        xmlFreeDoc(doc);
        return(NULL);
    }
    catalog = xmlNewDocNode(doc, ns, BAD_CAST "catalog", NULL);
    if (catalog == NULL) {
        xmlFreeDoc(doc);
        xmlFreeNs(ns);
        return(NULL);
    }
    catalog->nsDef = ns;
    xmlAddChild((xmlNodePtr) doc, catalog);
    xmlDumpXMLCatalogNode(catal, catalog, doc, ns, NULL);

    return(doc);
}

static int
xmlDumpXMLCatalog(FILE *out, xmlCatalogEntryPtr catal) {
    int ret;
    xmlDocPtr doc;
    xmlOutputBufferPtr buf;

    /*
     * Rebuild a catalog
     */
    doc = xmlDumpXMLCatalogToDoc(catal);
    if (doc == NULL) {
        return(-1);
    }

    /*
     * reserialize it
     */
    buf = xmlOutputBufferCreateFile(out, NULL);
    if (buf == NULL) {
  xmlFreeDoc(doc);
  return(-1);
    }
    ret = xmlSaveFormatFileTo(buf, doc, NULL, 1);

    /*
     * Free it
     */
    xmlFreeDoc(doc);

    return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/************************************************************************
 *                  *
 *      Converting SGML Catalogs to XML     *
 *                  *
 ************************************************************************/

#ifdef LIBXML_SGML_CATALOG_ENABLED

/**
 * Convert one entry from the catalog
 *
 * @param payload  the entry
 * @param data  pointer to the catalog being converted
 * @param name  unused
 */
static void
xmlCatalogConvertEntry(void *payload, void *data,
                       const xmlChar *name ATTRIBUTE_UNUSED) {
    xmlCatalogEntryPtr entry = (xmlCatalogEntryPtr) payload;
    xmlCatalogPtr catal = (xmlCatalogPtr) data;
    if ((entry == NULL) || (catal == NULL) || (catal->sgml == NULL) ||
  (catal->xml == NULL))
  return;
    switch (entry->type) {
  case SGML_CATA_ENTITY:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_PENTITY:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_DOCTYPE:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_LINKTYPE:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_NOTATION:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_PUBLIC:
      entry->type = XML_CATA_PUBLIC;
      break;
  case SGML_CATA_SYSTEM:
      entry->type = XML_CATA_SYSTEM;
      break;
  case SGML_CATA_DELEGATE:
      entry->type = XML_CATA_DELEGATE_PUBLIC;
      break;
  case SGML_CATA_CATALOG:
      entry->type = XML_CATA_CATALOG;
      break;
  default:
      xmlHashRemoveEntry(catal->sgml, entry->name, xmlFreeCatalogEntry);
      return;
    }
    /*
     * Conversion successful, remove from the SGML catalog
     * and add it to the default XML one
     */
    xmlHashRemoveEntry(catal->sgml, entry->name, NULL);
    entry->parent = catal->xml;
    entry->next = NULL;
    if (catal->xml->children == NULL)
  catal->xml->children = entry;
    else {
  xmlCatalogEntryPtr prev;

  prev = catal->xml->children;
  while (prev->next != NULL)
      prev = prev->next;
  prev->next = entry;
    }
}

/**
 * Convert all the SGML catalog entries as XML ones
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  the catalog
 * @returns the number of entries converted if successful, -1 otherwise
 */
int
xmlConvertSGMLCatalog(xmlCatalog *catal) {

    if ((catal == NULL) || (catal->type != XML_SGML_CATALOG_TYPE))
  return(-1);

    if (xmlDebugCatalogs) {
  xmlCatalogPrintDebug(
    "Converting SGML catalog to XML\n");
    }
    xmlHashScan(catal->sgml, xmlCatalogConvertEntry, &catal);
    return(0);
}

#endif /* LIBXML_SGML_CATALOG_ENABLED */

/************************************************************************
 *                  *
 *      Helper function         *
 *                  *
 ************************************************************************/

/**
 * Expand the URN into the equivalent Public Identifier
 *
 * @param urn  an "urn:publicid:" to unwrap
 * @returns the new identifier or NULL, the string must be deallocated
 *         by the caller.
 */
static xmlChar *
xmlCatalogUnWrapURN(const xmlChar *urn) {
    xmlChar result[2000];
    unsigned int i = 0;

    if (xmlStrncmp(urn, BAD_CAST XML_URN_PUBID, sizeof(XML_URN_PUBID) - 1))
  return(NULL);
    urn += sizeof(XML_URN_PUBID) - 1;

    while (*urn != 0) {
  if (i > sizeof(result) - 4)
      break;
  if (*urn == '+') {
      result[i++] = ' ';
      urn++;
  } else if (*urn == ':') {
      result[i++] = '/';
      result[i++] = '/';
      urn++;
  } else if (*urn == ';') {
      result[i++] = ':';
      result[i++] = ':';
      urn++;
  } else if (*urn == '%') {
      if ((urn[1] == '2') && (urn[2] == 'B'))
    result[i++] = '+';
      else if ((urn[1] == '3') && (urn[2] == 'A'))
    result[i++] = ':';
      else if ((urn[1] == '2') && (urn[2] == 'F'))
    result[i++] = '/';
      else if ((urn[1] == '3') && (urn[2] == 'B'))
    result[i++] = ';';
      else if ((urn[1] == '2') && (urn[2] == '7'))
    result[i++] = '\'';
      else if ((urn[1] == '3') && (urn[2] == 'F'))
    result[i++] = '?';
      else if ((urn[1] == '2') && (urn[2] == '3'))
    result[i++] = '#';
      else if ((urn[1] == '2') && (urn[2] == '5'))
    result[i++] = '%';
      else {
    result[i++] = *urn;
    urn++;
    continue;
      }
      urn += 3;
  } else {
      result[i++] = *urn;
      urn++;
  }
    }
    result[i] = 0;

    return(xmlStrdup(result));
}

/**
 * parse an XML file and build a tree. It's like #xmlParseFile
 * except it bypass all catalog lookups.
 *
 * @deprecated Internal function, don't use
 *
 * @param filename  the filename
 * @returns the resulting document tree or NULL in case of error
 */

xmlDoc *
xmlParseCatalogFile(const char *filename) {
    xmlDocPtr ret;
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr inputStream;
    xmlParserInputBufferPtr buf;

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlCatalogErrMemory();
  return(NULL);
    }

    buf = xmlParserInputBufferCreateFilename(filename, XML_CHAR_ENCODING_NONE);
    if (buf == NULL) {
  xmlFreeParserCtxt(ctxt);
  return(NULL);
    }

    inputStream = xmlNewInputStream(ctxt);
    if (inputStream == NULL) {
  xmlFreeParserInputBuffer(buf);
  xmlFreeParserCtxt(ctxt);
  return(NULL);
    }

    inputStream->filename = (char *) xmlCanonicPath((const xmlChar *)filename);
    inputStream->buf = buf;
    xmlBufResetInput(buf->buffer, inputStream);

    if (xmlCtxtPushInput(ctxt, inputStream) < 0) {
        xmlFreeInputStream(inputStream);
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    ctxt->valid = 0;
    ctxt->validate = 0;
    ctxt->loadsubset = 0;
    ctxt->pedantic = 0;
    ctxt->dictNames = 1;

    xmlParseDocument(ctxt);

    if (ctxt->wellFormed)
  ret = ctxt->myDoc;
    else {
        ret = NULL;
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * Load a file content into memory.
 *
 * @param filename  a file path
 * @returns a pointer to the 0 terminated string or NULL in case of error
 */
static xmlChar *
xmlLoadFileContent(const char *filename)
{
    int fd;
    int len;
    long size;

    struct stat info;
    xmlChar *content;

    if (filename == NULL)
        return (NULL);

    if (stat(filename, &info) < 0)
        return (NULL);

    fd = open(filename, O_RDONLY);
    if (fd  < 0)
    {
        return (NULL);
    }
    size = info.st_size;
    content = xmlMalloc(size + 10);
    if (content == NULL) {
        xmlCatalogErrMemory();
  close(fd);
        return (NULL);
    }
    len = read(fd, content, size);
    close(fd);
    if (len < 0) {
        xmlFree(content);
        return (NULL);
    }
    content[len] = 0;

    return(content);
}

/**
 *  Normalizes the Public Identifier
 *
 * Implements 6.2. Public Identifier Normalization
 * from http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * @param pubID  the public ID string
 * @returns the new string or NULL, the string must be deallocated
 *         by the caller.
 */
static xmlChar *
xmlCatalogNormalizePublic(const xmlChar *pubID)
{
    int ok = 1;
    int white;
    const xmlChar *p;
    xmlChar *ret;
    xmlChar *q;

    if (pubID == NULL)
        return(NULL);

    white = 1;
    for (p = pubID;*p != 0 && ok;p++) {
        if (!xmlIsBlank_ch(*p))
            white = 0;
        else if (*p == 0x20 && !white)
            white = 1;
        else
            ok = 0;
    }
    if (ok && !white) /* is normalized */
        return(NULL);

    ret = xmlStrdup(pubID);
    q = ret;
    white = 0;
    for (p = pubID;*p != 0;p++) {
        if (xmlIsBlank_ch(*p)) {
            if (q != ret)
                white = 1;
        } else {
            if (white) {
                *(q++) = 0x20;
                white = 0;
            }
            *(q++) = *p;
        }
    }
    *q = 0;
    return(ret);
}

/************************************************************************
 *                  *
 *      The XML Catalog parser        *
 *                  *
 ************************************************************************/

static xmlCatalogEntryPtr
xmlParseXMLCatalogFile(xmlCatalogPrefer prefer, const xmlChar *filename);
static void
xmlParseXMLCatalogNodeList(xmlNodePtr cur, xmlCatalogPrefer prefer,
                     xmlCatalogEntryPtr parent, xmlCatalogEntryPtr cgroup);
static xmlChar *
xmlCatalogListXMLResolve(xmlCatalogEntryPtr catal, const xmlChar *pubID,
                const xmlChar *sysID);
static xmlChar *
xmlCatalogListXMLResolveURI(xmlCatalogEntryPtr catal, const xmlChar *URI);


/**
 * lookup the internal type associated to an XML catalog entry name
 *
 * @param name  the name
 * @returns the type associated with that name
 */
static xmlCatalogEntryType
xmlGetXMLCatalogEntryType(const xmlChar *name) {
    xmlCatalogEntryType type = XML_CATA_NONE;
    if (xmlStrEqual(name, (const xmlChar *) "system"))
  type = XML_CATA_SYSTEM;
    else if (xmlStrEqual(name, (const xmlChar *) "public"))
  type = XML_CATA_PUBLIC;
    else if (xmlStrEqual(name, (const xmlChar *) "rewriteSystem"))
  type = XML_CATA_REWRITE_SYSTEM;
    else if (xmlStrEqual(name, (const xmlChar *) "delegatePublic"))
  type = XML_CATA_DELEGATE_PUBLIC;
    else if (xmlStrEqual(name, (const xmlChar *) "delegateSystem"))
  type = XML_CATA_DELEGATE_SYSTEM;
    else if (xmlStrEqual(name, (const xmlChar *) "uri"))
  type = XML_CATA_URI;
    else if (xmlStrEqual(name, (const xmlChar *) "rewriteURI"))
  type = XML_CATA_REWRITE_URI;
    else if (xmlStrEqual(name, (const xmlChar *) "delegateURI"))
  type = XML_CATA_DELEGATE_URI;
    else if (xmlStrEqual(name, (const xmlChar *) "nextCatalog"))
  type = XML_CATA_NEXT_CATALOG;
    else if (xmlStrEqual(name, (const xmlChar *) "catalog"))
  type = XML_CATA_CATALOG;
    return(type);
}

/**
 * Finishes the examination of an XML tree node of a catalog and build
 * a Catalog entry from it.
 *
 * @param cur  the XML node
 * @param type  the type of Catalog entry
 * @param name  the name of the node
 * @param attrName  the attribute holding the value
 * @param uriAttrName  the attribute holding the URI-Reference
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @param cgroup  the group which includes this node
 * @returns the new Catalog entry node or NULL in case of error.
 */
static xmlCatalogEntryPtr
xmlParseXMLCatalogOneNode(xmlNodePtr cur, xmlCatalogEntryType type,
        const xmlChar *name, const xmlChar *attrName,
        const xmlChar *uriAttrName, xmlCatalogPrefer prefer,
        xmlCatalogEntryPtr cgroup) {
    int ok = 1;
    xmlChar *uriValue;
    xmlChar *nameValue = NULL;
    xmlChar *base = NULL;
    xmlChar *URL = NULL;
    xmlCatalogEntryPtr ret = NULL;

    if (attrName != NULL) {
  nameValue = xmlGetProp(cur, attrName);
  if (nameValue == NULL) {
      xmlCatalogErr(ret, cur, XML_CATALOG_MISSING_ATTR,
        "%s entry lacks '%s'\n", name, attrName, NULL);
      ok = 0;
  }
    }
    uriValue = xmlGetProp(cur, uriAttrName);
    if (uriValue == NULL) {
  xmlCatalogErr(ret, cur, XML_CATALOG_MISSING_ATTR,
    "%s entry lacks '%s'\n", name, uriAttrName, NULL);
  ok = 0;
    }
    if (!ok) {
  if (nameValue != NULL)
      xmlFree(nameValue);
  if (uriValue != NULL)
      xmlFree(uriValue);
  return(NULL);
    }

    base = xmlNodeGetBase(cur->doc, cur);
    URL = xmlBuildURI(uriValue, base);
    if (URL != NULL) {
  if (xmlDebugCatalogs > 1) {
      if (nameValue != NULL)
    xmlCatalogPrintDebug(
      "Found %s: '%s' '%s'\n", name, nameValue, URL);
      else
    xmlCatalogPrintDebug(
      "Found %s: '%s'\n", name, URL);
  }
  ret = xmlNewCatalogEntry(type, nameValue, uriValue, URL, prefer, cgroup);
    } else {
  xmlCatalogErr(ret, cur, XML_CATALOG_ENTRY_BROKEN,
    "%s entry '%s' broken ?: %s\n", name, uriAttrName, uriValue);
    }
    if (nameValue != NULL)
  xmlFree(nameValue);
    if (uriValue != NULL)
  xmlFree(uriValue);
    if (base != NULL)
  xmlFree(base);
    if (URL != NULL)
  xmlFree(URL);
    return(ret);
}


/**
 * Examines an XML tree node of a catalog and build
 * a Catalog entry from it adding it to its parent. The examination can
 * be recursive.
 *
 * @param cur  the XML node
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @param parent  the parent Catalog entry
 * @param cgroup  the group which includes this node
 */
static void
xmlParseXMLCatalogNode(xmlNodePtr cur, xmlCatalogPrefer prefer,
                 xmlCatalogEntryPtr parent, xmlCatalogEntryPtr cgroup)
{
    xmlChar *base = NULL;
    xmlCatalogEntryPtr entry = NULL;

    if (cur == NULL)
        return;
    if (xmlStrEqual(cur->name, BAD_CAST "group")) {
        xmlChar *prop;
  xmlCatalogPrefer pref = XML_CATA_PREFER_NONE;

        prop = xmlGetProp(cur, BAD_CAST "prefer");
        if (prop != NULL) {
            if (xmlStrEqual(prop, BAD_CAST "system")) {
                prefer = XML_CATA_PREFER_SYSTEM;
            } else if (xmlStrEqual(prop, BAD_CAST "public")) {
                prefer = XML_CATA_PREFER_PUBLIC;
            } else {
    xmlCatalogErr(parent, cur, XML_CATALOG_PREFER_VALUE,
                              "Invalid value for prefer: '%s'\n",
            prop, NULL, NULL);
            }
            xmlFree(prop);
      pref = prefer;
        }
  prop = xmlGetProp(cur, BAD_CAST "id");
  base = xmlGetNsProp(cur, BAD_CAST "base", XML_XML_NAMESPACE);
  entry = xmlNewCatalogEntry(XML_CATA_GROUP, prop, base, NULL, pref, cgroup);
  xmlFree(prop);
    } else if (xmlStrEqual(cur->name, BAD_CAST "public")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_PUBLIC,
    BAD_CAST "public", BAD_CAST "publicId", BAD_CAST "uri", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "system")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_SYSTEM,
    BAD_CAST "system", BAD_CAST "systemId", BAD_CAST "uri", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "rewriteSystem")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_REWRITE_SYSTEM,
    BAD_CAST "rewriteSystem", BAD_CAST "systemIdStartString",
    BAD_CAST "rewritePrefix", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "delegatePublic")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_DELEGATE_PUBLIC,
    BAD_CAST "delegatePublic", BAD_CAST "publicIdStartString",
    BAD_CAST "catalog", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "delegateSystem")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_DELEGATE_SYSTEM,
    BAD_CAST "delegateSystem", BAD_CAST "systemIdStartString",
    BAD_CAST "catalog", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "uri")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_URI,
    BAD_CAST "uri", BAD_CAST "name",
    BAD_CAST "uri", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "rewriteURI")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_REWRITE_URI,
    BAD_CAST "rewriteURI", BAD_CAST "uriStartString",
    BAD_CAST "rewritePrefix", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "delegateURI")) {
  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_DELEGATE_URI,
    BAD_CAST "delegateURI", BAD_CAST "uriStartString",
    BAD_CAST "catalog", prefer, cgroup);
    } else if (xmlStrEqual(cur->name, BAD_CAST "nextCatalog")) {
  xmlCatalogEntryPtr prev = parent->children;

  entry = xmlParseXMLCatalogOneNode(cur, XML_CATA_NEXT_CATALOG,
    BAD_CAST "nextCatalog", NULL,
    BAD_CAST "catalog", prefer, cgroup);
  /* Avoid duplication of nextCatalog */
  while (prev != NULL) {
      if ((prev->type == XML_CATA_NEXT_CATALOG) &&
    (xmlStrEqual (prev->URL, entry->URL)) &&
    (prev->prefer == entry->prefer) &&
    (prev->group == entry->group)) {
        if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
          "Ignoring repeated nextCatalog %s\n", entry->URL);
        xmlFreeCatalogEntry(entry, NULL);
        entry = NULL;
        break;
      }
      prev = prev->next;
  }
    }
    if (entry != NULL) {
        if (parent != NULL) {
      entry->parent = parent;
      if (parent->children == NULL)
    parent->children = entry;
      else {
    xmlCatalogEntryPtr prev;

    prev = parent->children;
    while (prev->next != NULL)
        prev = prev->next;
    prev->next = entry;
      }
  }
  if (entry->type == XML_CATA_GROUP) {
      /*
       * Recurse to propagate prefer to the subtree
       * (xml:base handling is automated)
       */
            xmlParseXMLCatalogNodeList(cur->children, prefer, parent, entry);
  }
    }
    if (base != NULL)
  xmlFree(base);
}

/**
 * Examines a list of XML sibling nodes of a catalog and build
 * a list of Catalog entry from it adding it to the parent.
 * The examination will recurse to examine node subtrees.
 *
 * @param cur  the XML node list of siblings
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @param parent  the parent Catalog entry
 * @param cgroup  the group which includes this list
 */
static void
xmlParseXMLCatalogNodeList(xmlNodePtr cur, xmlCatalogPrefer prefer,
                     xmlCatalogEntryPtr parent, xmlCatalogEntryPtr cgroup) {
    while (cur != NULL) {
  if ((cur->ns != NULL) && (cur->ns->href != NULL) &&
      (xmlStrEqual(cur->ns->href, XML_CATALOGS_NAMESPACE))) {
      xmlParseXMLCatalogNode(cur, prefer, parent, cgroup);
  }
  cur = cur->next;
    }
    /* TODO: sort the list according to REWRITE lengths and prefer value */
}

/**
 * Parses the catalog file to extract the XML tree and then analyze the
 * tree to build a list of Catalog entries corresponding to this catalog
 *
 * @param prefer  the PUBLIC vs. SYSTEM current preference value
 * @param filename  the filename for the catalog
 * @returns the resulting Catalog entries list
 */
static xmlCatalogEntryPtr
xmlParseXMLCatalogFile(xmlCatalogPrefer prefer, const xmlChar *filename) {
    xmlDocPtr doc;
    xmlNodePtr cur;
    xmlChar *prop;
    xmlCatalogEntryPtr parent = NULL;

    if (filename == NULL)
        return(NULL);

    doc = xmlParseCatalogFile((const char *) filename);
    if (doc == NULL) {
  if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
        "Failed to parse catalog %s\n", filename);
  return(NULL);
    }

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Parsing catalog %s\n", filename);

    cur = xmlDocGetRootElement(doc);
    if ((cur != NULL) && (xmlStrEqual(cur->name, BAD_CAST "catalog")) &&
  (cur->ns != NULL) && (cur->ns->href != NULL) &&
  (xmlStrEqual(cur->ns->href, XML_CATALOGS_NAMESPACE))) {

  parent = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL,
            (const xmlChar *)filename, NULL, prefer, NULL);
        if (parent == NULL) {
      xmlFreeDoc(doc);
      return(NULL);
  }

  prop = xmlGetProp(cur, BAD_CAST "prefer");
  if (prop != NULL) {
      if (xmlStrEqual(prop, BAD_CAST "system")) {
    prefer = XML_CATA_PREFER_SYSTEM;
      } else if (xmlStrEqual(prop, BAD_CAST "public")) {
    prefer = XML_CATA_PREFER_PUBLIC;
      } else {
    xmlCatalogErr(NULL, cur, XML_CATALOG_PREFER_VALUE,
            "Invalid value for prefer: '%s'\n",
            prop, NULL, NULL);
      }
      xmlFree(prop);
  }
  cur = cur->children;
  xmlParseXMLCatalogNodeList(cur, prefer, parent, NULL);
    } else {
  xmlCatalogErr(NULL, (xmlNodePtr) doc, XML_CATALOG_NOT_CATALOG,
          "File %s is not an XML Catalog\n",
          filename, NULL, NULL);
  xmlFreeDoc(doc);
  return(NULL);
    }
    xmlFreeDoc(doc);
    return(parent);
}

/**
 * Fetch and parse the subcatalog referenced by an entry
 *
 * @param catal  an existing but incomplete catalog entry
 * @returns 0 in case of success, -1 otherwise
 */
static int
xmlFetchXMLCatalogFile(xmlCatalogEntryPtr catal) {
    xmlCatalogEntryPtr doc;

    if (catal == NULL)
  return(-1);
    if (catal->URL == NULL)
  return(-1);

    /*
     * lock the whole catalog for modification
     */
    xmlRMutexLock(&xmlCatalogMutex);
    if (catal->children != NULL) {
  /* Okay someone else did it in the meantime */
  xmlRMutexUnlock(&xmlCatalogMutex);
  return(0);
    }

    if (xmlCatalogXMLFiles != NULL) {
  doc = (xmlCatalogEntryPtr)
      xmlHashLookup(xmlCatalogXMLFiles, catal->URL);
  if (doc != NULL) {
      if (xmlDebugCatalogs)
    xmlCatalogPrintDebug(
        "Found %s in file hash\n", catal->URL);

      if (catal->type == XML_CATA_CATALOG)
    catal->children = doc->children;
      else
    catal->children = doc;
      catal->dealloc = 0;
      xmlRMutexUnlock(&xmlCatalogMutex);
      return(0);
  }
  if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
    "%s not found in file hash\n", catal->URL);
    }

    /*
     * Fetch and parse. Note that xmlParseXMLCatalogFile does not
     * use the existing catalog, there is no recursion allowed at
     * that level.
     */
    doc = xmlParseXMLCatalogFile(catal->prefer, catal->URL);
    if (doc == NULL) {
  catal->type = XML_CATA_BROKEN_CATALOG;
  xmlRMutexUnlock(&xmlCatalogMutex);
  return(-1);
    }

    if (catal->type == XML_CATA_CATALOG)
  catal->children = doc->children;
    else
  catal->children = doc;

    doc->dealloc = 1;

    if (xmlCatalogXMLFiles == NULL)
  xmlCatalogXMLFiles = xmlHashCreate(10);
    if (xmlCatalogXMLFiles != NULL) {
  if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
    "%s added to file hash\n", catal->URL);
  xmlHashAddEntry(xmlCatalogXMLFiles, catal->URL, doc);
    }
    xmlRMutexUnlock(&xmlCatalogMutex);
    return(0);
}

/************************************************************************
 *                  *
 *      XML Catalog handling        *
 *                  *
 ************************************************************************/

/**
 * Add an entry in the XML catalog, it may overwrite existing but
 * different entries.
 *
 * @param catal  top of an XML catalog
 * @param type  the type of record to add to the catalog
 * @param orig  the system, public or prefix to match (or NULL)
 * @param replace  the replacement value for the match
 * @returns 0 if successful, -1 otherwise
 */
static int
xmlAddXMLCatalog(xmlCatalogEntryPtr catal, const xmlChar *type,
        const xmlChar *orig, const xmlChar *replace) {
    xmlCatalogEntryPtr cur;
    xmlCatalogEntryType typ;
    int doregister = 0;

    if ((catal == NULL) ||
  ((catal->type != XML_CATA_CATALOG) &&
   (catal->type != XML_CATA_BROKEN_CATALOG)))
  return(-1);
    if (catal->children == NULL) {
  xmlFetchXMLCatalogFile(catal);
    }
    if (catal->children == NULL)
  doregister = 1;

    typ = xmlGetXMLCatalogEntryType(type);
    if (typ == XML_CATA_NONE) {
  if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
        "Failed to add unknown element %s to catalog\n", type);
  return(-1);
    }

    cur = catal->children;
    /*
     * Might be a simple "update in place"
     */
    if (cur != NULL) {
  while (cur != NULL) {
      if ((orig != NULL) && (cur->type == typ) &&
    (xmlStrEqual(orig, cur->name))) {
    if (xmlDebugCatalogs)
        xmlCatalogPrintDebug(
          "Updating element %s to catalog\n", type);
    if (cur->value != NULL)
        xmlFree(cur->value);
    if (cur->URL != NULL)
        xmlFree(cur->URL);
    cur->value = xmlStrdup(replace);
    cur->URL = xmlStrdup(replace);
    return(0);
      }
      if (cur->next == NULL)
    break;
      cur = cur->next;
  }
    }
    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Adding element %s to catalog\n", type);
    if (cur == NULL)
  catal->children = xmlNewCatalogEntry(typ, orig, replace,
                                 NULL, catal->prefer, NULL);
    else
  cur->next = xmlNewCatalogEntry(typ, orig, replace,
                           NULL, catal->prefer, NULL);
    if (doregister) {
        catal->type = XML_CATA_CATALOG;
  cur = (xmlCatalogEntryPtr)xmlHashLookup(xmlCatalogXMLFiles, catal->URL);
  if (cur != NULL)
      cur->children = catal->children;
    }

    return(0);
}

/**
 * Remove entries in the XML catalog where the value or the URI
 * is equal to `value`
 *
 * @param catal  top of an XML catalog
 * @param value  the value to remove from the catalog
 * @returns the number of entries removed if successful, -1 otherwise
 */
static int
xmlDelXMLCatalog(xmlCatalogEntryPtr catal, const xmlChar *value) {
    xmlCatalogEntryPtr cur;
    int ret = 0;

    if ((catal == NULL) ||
  ((catal->type != XML_CATA_CATALOG) &&
   (catal->type != XML_CATA_BROKEN_CATALOG)))
  return(-1);
    if (value == NULL)
  return(-1);
    if (catal->children == NULL) {
  xmlFetchXMLCatalogFile(catal);
    }

    /*
     * Scan the children
     */
    cur = catal->children;
    while (cur != NULL) {
  if (((cur->name != NULL) && (xmlStrEqual(value, cur->name))) ||
      (xmlStrEqual(value, cur->value))) {
      if (xmlDebugCatalogs) {
    if (cur->name != NULL)
        xmlCatalogPrintDebug(
          "Removing element %s from catalog\n", cur->name);
    else
        xmlCatalogPrintDebug(
          "Removing element %s from catalog\n", cur->value);
      }
      cur->type = XML_CATA_REMOVED;
  }
  cur = cur->next;
    }
    return(ret);
}

/**
 * Do a complete resolution lookup of an External Identifier for a
 * list of catalog entries.
 *
 * Implements (or tries to) 7.1. External Identifier Resolution
 * from http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * @param catal  a catalog list
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found
 */
static xmlChar *
xmlCatalogXMLResolve(xmlCatalogEntryPtr catal, const xmlChar *pubID,
                const xmlChar *sysID) {
    xmlChar *ret = NULL;
    xmlCatalogEntryPtr cur;
    int haveDelegate = 0;
    int haveNext = 0;

    /*
     * protection against loops
     */
    if (catal->depth > MAX_CATAL_DEPTH) {
  xmlCatalogErr(catal, NULL, XML_CATALOG_RECURSION,
          "Detected recursion in catalog %s\n",
          catal->name, NULL, NULL);
  return(NULL);
    }
    catal->depth++;

    /*
     * First tries steps 2/ 3/ 4/ if a system ID is provided.
     */
    if (sysID != NULL) {
  xmlCatalogEntryPtr rewrite = NULL;
  int lenrewrite = 0, len;
  cur = catal;
  haveDelegate = 0;
  while (cur != NULL) {
      switch (cur->type) {
    case XML_CATA_SYSTEM:
        if (xmlStrEqual(sysID, cur->name)) {
      if (xmlDebugCatalogs)
          xmlCatalogPrintDebug(
            "Found system match %s, using %s\n",
                    cur->name, cur->URL);
      catal->depth--;
      return(xmlStrdup(cur->URL));
        }
        break;
    case XML_CATA_REWRITE_SYSTEM:
        len = xmlStrlen(cur->name);
        if ((len > lenrewrite) &&
      (!xmlStrncmp(sysID, cur->name, len))) {
      lenrewrite = len;
      rewrite = cur;
        }
        break;
    case XML_CATA_DELEGATE_SYSTEM:
        if (!xmlStrncmp(sysID, cur->name, xmlStrlen(cur->name)))
      haveDelegate++;
        break;
    case XML_CATA_NEXT_CATALOG:
        haveNext++;
        break;
    default:
        break;
      }
      cur = cur->next;
  }
  if (rewrite != NULL) {
      if (xmlDebugCatalogs)
    xmlCatalogPrintDebug(
      "Using rewriting rule %s\n", rewrite->name);
      ret = xmlStrdup(rewrite->URL);
      if (ret != NULL)
    ret = xmlStrcat(ret, &sysID[lenrewrite]);
      catal->depth--;
      return(ret);
  }
  if (haveDelegate) {
      const xmlChar *delegates[MAX_DELEGATE];
      int nbList = 0, i;

      /*
       * Assume the entries have been sorted by decreasing substring
       * matches when the list was produced.
       */
      cur = catal;
      while (cur != NULL) {
    if ((cur->type == XML_CATA_DELEGATE_SYSTEM) &&
        (!xmlStrncmp(sysID, cur->name, xmlStrlen(cur->name)))) {
        for (i = 0;i < nbList;i++)
      if (xmlStrEqual(cur->URL, delegates[i]))
          break;
        if (i < nbList) {
      cur = cur->next;
      continue;
        }
        if (nbList < MAX_DELEGATE)
      delegates[nbList++] = cur->URL;

        if (cur->children == NULL) {
      xmlFetchXMLCatalogFile(cur);
        }
        if (cur->children != NULL) {
      if (xmlDebugCatalogs)
          xmlCatalogPrintDebug(
            "Trying system delegate %s\n", cur->URL);
      ret = xmlCatalogListXMLResolve(
        cur->children, NULL, sysID);
      if (ret != NULL) {
          catal->depth--;
          return(ret);
      }
        }
    }
    cur = cur->next;
      }
      /*
       * Apply the cut algorithm explained in 4/
       */
      catal->depth--;
      return(XML_CATAL_BREAK);
  }
    }
    /*
     * Then tries 5/ 6/ if a public ID is provided
     */
    if (pubID != NULL) {
  cur = catal;
  haveDelegate = 0;
  while (cur != NULL) {
      switch (cur->type) {
    case XML_CATA_PUBLIC:
        if (xmlStrEqual(pubID, cur->name)) {
      if (xmlDebugCatalogs)
          xmlCatalogPrintDebug(
            "Found public match %s\n", cur->name);
      catal->depth--;
      return(xmlStrdup(cur->URL));
        }
        break;
    case XML_CATA_DELEGATE_PUBLIC:
        if (!xmlStrncmp(pubID, cur->name, xmlStrlen(cur->name)) &&
      (cur->prefer == XML_CATA_PREFER_PUBLIC))
      haveDelegate++;
        break;
    case XML_CATA_NEXT_CATALOG:
        if (sysID == NULL)
      haveNext++;
        break;
    default:
        break;
      }
      cur = cur->next;
  }
  if (haveDelegate) {
      const xmlChar *delegates[MAX_DELEGATE];
      int nbList = 0, i;

      /*
       * Assume the entries have been sorted by decreasing substring
       * matches when the list was produced.
       */
      cur = catal;
      while (cur != NULL) {
    if ((cur->type == XML_CATA_DELEGATE_PUBLIC) &&
        (cur->prefer == XML_CATA_PREFER_PUBLIC) &&
        (!xmlStrncmp(pubID, cur->name, xmlStrlen(cur->name)))) {

        for (i = 0;i < nbList;i++)
      if (xmlStrEqual(cur->URL, delegates[i]))
          break;
        if (i < nbList) {
      cur = cur->next;
      continue;
        }
        if (nbList < MAX_DELEGATE)
      delegates[nbList++] = cur->URL;

        if (cur->children == NULL) {
      xmlFetchXMLCatalogFile(cur);
        }
        if (cur->children != NULL) {
      if (xmlDebugCatalogs)
          xmlCatalogPrintDebug(
            "Trying public delegate %s\n", cur->URL);
      ret = xmlCatalogListXMLResolve(
        cur->children, pubID, NULL);
      if (ret != NULL) {
          catal->depth--;
          return(ret);
      }
        }
    }
    cur = cur->next;
      }
      /*
       * Apply the cut algorithm explained in 4/
       */
      catal->depth--;
      return(XML_CATAL_BREAK);
  }
    }
    if (haveNext) {
  cur = catal;
  while (cur != NULL) {
      if (cur->type == XML_CATA_NEXT_CATALOG) {
    if (cur->children == NULL) {
        xmlFetchXMLCatalogFile(cur);
    }
    if (cur->children != NULL) {
        ret = xmlCatalogListXMLResolve(cur->children, pubID, sysID);
        if (ret != NULL) {
      catal->depth--;
      return(ret);
        } else if (catal->depth > MAX_CATAL_DEPTH) {
            return(NULL);
        }
    }
      }
      cur = cur->next;
  }
    }

    catal->depth--;
    return(NULL);
}

/**
 * Do a complete resolution lookup of an External Identifier for a
 * list of catalog entries.
 *
 * Implements (or tries to) 7.2.2. URI Resolution
 * from http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * @param catal  a catalog list
 * @param URI  the URI
 * @returns the URI of the resource or NULL if not found
 */
static xmlChar *
xmlCatalogXMLResolveURI(xmlCatalogEntryPtr catal, const xmlChar *URI) {
    xmlChar *ret = NULL;
    xmlCatalogEntryPtr cur;
    int haveDelegate = 0;
    int haveNext = 0;
    xmlCatalogEntryPtr rewrite = NULL;
    int lenrewrite = 0, len;

    if (catal == NULL)
  return(NULL);

    if (URI == NULL)
  return(NULL);

    if (catal->depth > MAX_CATAL_DEPTH) {
  xmlCatalogErr(catal, NULL, XML_CATALOG_RECURSION,
          "Detected recursion in catalog %s\n",
          catal->name, NULL, NULL);
  return(NULL);
    }

    /*
     * First tries steps 2/ 3/ 4/ if a system ID is provided.
     */
    cur = catal;
    haveDelegate = 0;
    while (cur != NULL) {
  switch (cur->type) {
      case XML_CATA_URI:
    if (xmlStrEqual(URI, cur->name)) {
        if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
        "Found URI match %s\n", cur->name);
        return(xmlStrdup(cur->URL));
    }
    break;
      case XML_CATA_REWRITE_URI:
    len = xmlStrlen(cur->name);
    if ((len > lenrewrite) &&
        (!xmlStrncmp(URI, cur->name, len))) {
        lenrewrite = len;
        rewrite = cur;
    }
    break;
      case XML_CATA_DELEGATE_URI:
    if (!xmlStrncmp(URI, cur->name, xmlStrlen(cur->name)))
        haveDelegate++;
    break;
      case XML_CATA_NEXT_CATALOG:
    haveNext++;
    break;
      default:
    break;
  }
  cur = cur->next;
    }
    if (rewrite != NULL) {
  if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
        "Using rewriting rule %s\n", rewrite->name);
  ret = xmlStrdup(rewrite->URL);
  if (ret != NULL)
      ret = xmlStrcat(ret, &URI[lenrewrite]);
  return(ret);
    }
    if (haveDelegate) {
  const xmlChar *delegates[MAX_DELEGATE];
  int nbList = 0, i;

  /*
   * Assume the entries have been sorted by decreasing substring
   * matches when the list was produced.
   */
  cur = catal;
  while (cur != NULL) {
      if (((cur->type == XML_CATA_DELEGATE_SYSTEM) ||
           (cur->type == XML_CATA_DELEGATE_URI)) &&
    (!xmlStrncmp(URI, cur->name, xmlStrlen(cur->name)))) {
    for (i = 0;i < nbList;i++)
        if (xmlStrEqual(cur->URL, delegates[i]))
      break;
    if (i < nbList) {
        cur = cur->next;
        continue;
    }
    if (nbList < MAX_DELEGATE)
        delegates[nbList++] = cur->URL;

    if (cur->children == NULL) {
        xmlFetchXMLCatalogFile(cur);
    }
    if (cur->children != NULL) {
        if (xmlDebugCatalogs)
      xmlCatalogPrintDebug(
        "Trying URI delegate %s\n", cur->URL);
        ret = xmlCatalogListXMLResolveURI(
          cur->children, URI);
        if (ret != NULL)
      return(ret);
    }
      }
      cur = cur->next;
  }
  /*
   * Apply the cut algorithm explained in 4/
   */
  return(XML_CATAL_BREAK);
    }
    if (haveNext) {
  cur = catal;
  while (cur != NULL) {
      if (cur->type == XML_CATA_NEXT_CATALOG) {
    if (cur->children == NULL) {
        xmlFetchXMLCatalogFile(cur);
    }
    if (cur->children != NULL) {
        ret = xmlCatalogListXMLResolveURI(cur->children, URI);
        if (ret != NULL)
      return(ret);
    }
      }
      cur = cur->next;
  }
    }

    return(NULL);
}

/**
 * Do a complete resolution lookup of an External Identifier for a
 * list of catalogs
 *
 * Implements (or tries to) 7.1. External Identifier Resolution
 * from http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * @param catal  a catalog list
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found
 */
static xmlChar *
xmlCatalogListXMLResolve(xmlCatalogEntryPtr catal, const xmlChar *pubID,
                const xmlChar *sysID) {
    xmlChar *ret = NULL;
    xmlChar *urnID = NULL;
    xmlChar *normid;

    if (catal == NULL)
        return(NULL);
    if ((pubID == NULL) && (sysID == NULL))
  return(NULL);

    normid = xmlCatalogNormalizePublic(pubID);
    if (normid != NULL)
        pubID = (*normid != 0 ? normid : NULL);

    if (!xmlStrncmp(pubID, BAD_CAST XML_URN_PUBID, sizeof(XML_URN_PUBID) - 1)) {
  urnID = xmlCatalogUnWrapURN(pubID);
  if (xmlDebugCatalogs) {
      if (urnID == NULL)
    xmlCatalogPrintDebug(
      "Public URN ID %s expanded to NULL\n", pubID);
      else
    xmlCatalogPrintDebug(
      "Public URN ID expanded to %s\n", urnID);
  }
  ret = xmlCatalogListXMLResolve(catal, urnID, sysID);
  if (urnID != NULL)
      xmlFree(urnID);
  if (normid != NULL)
      xmlFree(normid);
  return(ret);
    }
    if (!xmlStrncmp(sysID, BAD_CAST XML_URN_PUBID, sizeof(XML_URN_PUBID) - 1)) {
  urnID = xmlCatalogUnWrapURN(sysID);
  if (xmlDebugCatalogs) {
      if (urnID == NULL)
    xmlCatalogPrintDebug(
      "System URN ID %s expanded to NULL\n", sysID);
      else
    xmlCatalogPrintDebug(
      "System URN ID expanded to %s\n", urnID);
  }
  if (pubID == NULL)
      ret = xmlCatalogListXMLResolve(catal, urnID, NULL);
  else if (xmlStrEqual(pubID, urnID))
      ret = xmlCatalogListXMLResolve(catal, pubID, NULL);
  else {
      ret = xmlCatalogListXMLResolve(catal, pubID, urnID);
  }
  if (urnID != NULL)
      xmlFree(urnID);
  if (normid != NULL)
      xmlFree(normid);
  return(ret);
    }
    while (catal != NULL) {
  if (catal->type == XML_CATA_CATALOG) {
            if (xmlCatalogResolveCacheVisited(catal->URL, pubID, sysID)) {
                if (xmlDebugCatalogs) xmlCatalogPrintDebug("Ignoring %s, already visited for %s, %s\n", catal->URL, pubID, sysID);
                catal = catal->next;
                continue;
            }
      if (catal->children == NULL) {
    xmlFetchXMLCatalogFile(catal);
      }
      if (catal->children != NULL) {
    ret = xmlCatalogXMLResolve(catal->children, pubID, sysID);
    if (ret != NULL) {
        break;
                } else if (catal->children->depth > MAX_CATAL_DEPTH) {
              ret = NULL;
        break;
          }
      }
  }
  catal = catal->next;
    }
    if (normid != NULL)
  xmlFree(normid);
    return(ret);
}

/**
 * Do a complete resolution lookup of an URI for a list of catalogs
 *
 * Implements (or tries to) 7.2. URI Resolution
 * from http://www.oasis-open.org/committees/entity/spec-2001-08-06.html
 *
 * @param catal  a catalog list
 * @param URI  the URI
 * @returns the URI of the resource or NULL if not found
 */
static xmlChar *
xmlCatalogListXMLResolveURI(xmlCatalogEntryPtr catal, const xmlChar *URI) {
    xmlChar *ret = NULL;
    xmlChar *urnID = NULL;
    xmlCatalogEntryPtr cur = NULL;

    if (catal == NULL)
        return(NULL);
    if (URI == NULL)
  return(NULL);

    if (catal->depth > MAX_CATAL_DEPTH) {
  xmlCatalogErr(catal, NULL, XML_CATALOG_RECURSION,
          "Detected recursion in catalog %s\n",
          catal->name, NULL, NULL);
  return(NULL);
    }
    catal->depth++;

    if (!xmlStrncmp(URI, BAD_CAST XML_URN_PUBID, sizeof(XML_URN_PUBID) - 1)) {
  urnID = xmlCatalogUnWrapURN(URI);
  if (xmlDebugCatalogs) {
      if (urnID == NULL)
    xmlCatalogPrintDebug(
      "URN ID %s expanded to NULL\n", URI);
      else
    xmlCatalogPrintDebug(
      "URN ID expanded to %s\n", urnID);
  }
  ret = xmlCatalogListXMLResolve(catal, urnID, NULL);
  if (urnID != NULL)
      xmlFree(urnID);
  catal->depth--;
  return(ret);
    }
    cur = catal;
    while (cur != NULL) {
  if (cur->type == XML_CATA_CATALOG) {
            if (xmlCatalogResolveCacheVisited(cur->URL, URI, NULL)) {
                if (xmlDebugCatalogs) xmlCatalogPrintDebug("Ignoring %s, already visited for %s\n", cur->URL, URI);
                cur = cur->next;
                continue;
            }

      if (cur->children == NULL) {
    xmlFetchXMLCatalogFile(cur);
      }
      if (cur->children != NULL) {
    ret = xmlCatalogXMLResolveURI(cur->children, URI);
    if (ret != NULL) {
        catal->depth--;
        return(ret);
    }
      }
  }
  cur = cur->next;
    }

    catal->depth--;
    return(ret);
}

#ifdef LIBXML_SGML_CATALOG_ENABLED

/************************************************************************
 *                  *
 *      The SGML Catalog parser       *
 *                  *
 ************************************************************************/


#define RAW *cur
#define NEXT cur++;
#define SKIP(x) cur += x;

#define SKIP_BLANKS while (IS_BLANK_CH(*cur)) NEXT;

/**
 * Skip a comment in an SGML catalog
 *
 * @param cur  the current character
 * @returns new current character
 */
static const xmlChar *
xmlParseSGMLCatalogComment(const xmlChar *cur) {
    if ((cur[0] != '-') || (cur[1] != '-'))
  return(cur);
    SKIP(2);
    while ((cur[0] != 0) && ((cur[0] != '-') || ((cur[1] != '-'))))
  NEXT;
    if (cur[0] == 0) {
  return(NULL);
    }
    return(cur + 2);
}

/**
 * Parse an SGML catalog ID
 *
 * @param cur  the current character
 * @param id  the return location
 * @returns new current character and store the value in `id`
 */
static const xmlChar *
xmlParseSGMLCatalogPubid(const xmlChar *cur, xmlChar **id) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = 50;
    xmlChar stop;

    *id = NULL;

    if (RAW == '"') {
        NEXT;
  stop = '"';
    } else if (RAW == '\'') {
        NEXT;
  stop = '\'';
    } else {
  stop = ' ';
    }
    buf = xmlMalloc(size);
    if (buf == NULL) {
        xmlCatalogErrMemory();
  return(NULL);
    }
    while (IS_PUBIDCHAR_CH(*cur) || (*cur == '?')) {
  if ((*cur == stop) && (stop != ' '))
      break;
  if ((stop == ' ') && (IS_BLANK_CH(*cur)))
      break;
  if (len + 1 >= size) {
            xmlChar *tmp;
            int newSize;

            newSize = xmlGrowCapacity(size, 1, 1, XML_MAX_ITEMS);
            if (newSize < 0) {
    xmlCatalogErrMemory();
    xmlFree(buf);
    return(NULL);
            }
      tmp = xmlRealloc(buf, newSize);
      if (tmp == NULL) {
    xmlCatalogErrMemory();
    xmlFree(buf);
    return(NULL);
      }
      buf = tmp;
            size = newSize;
  }
  buf[len++] = *cur;
  NEXT;
    }
    buf[len] = 0;
    if (stop == ' ') {
  if (!IS_BLANK_CH(*cur)) {
      xmlFree(buf);
      return(NULL);
  }
    } else {
  if (*cur != stop) {
      xmlFree(buf);
      return(NULL);
  }
  NEXT;
    }
    *id = buf;
    return(cur);
}

/**
 * Parse an SGML catalog name
 *
 * @param cur  the current character
 * @param name  the return location
 * @returns new current character and store the value in `name`
 */
static const xmlChar *
xmlParseSGMLCatalogName(const xmlChar *cur, xmlChar **name) {
    xmlChar buf[XML_MAX_NAMELEN + 5];
    int len = 0;
    int c;

    *name = NULL;

    /*
     * Handler for more complex cases
     */
    c = *cur;
    if ((!IS_LETTER(c) && (c != '_') && (c != ':'))) {
  return(NULL);
    }

    while (((IS_LETTER(c)) || (IS_DIGIT(c)) ||
            (c == '.') || (c == '-') ||
      (c == '_') || (c == ':'))) {
  buf[len++] = c;
  cur++;
  c = *cur;
  if (len >= XML_MAX_NAMELEN)
      return(NULL);
    }
    *name = xmlStrndup(buf, len);
    return(cur);
}

/**
 * Get the Catalog entry type for a given SGML Catalog name
 *
 * @param name  the entry name
 * @returns Catalog entry type
 */
static xmlCatalogEntryType
xmlGetSGMLCatalogEntryType(const xmlChar *name) {
    xmlCatalogEntryType type = XML_CATA_NONE;
    if (xmlStrEqual(name, (const xmlChar *) "SYSTEM"))
  type = SGML_CATA_SYSTEM;
    else if (xmlStrEqual(name, (const xmlChar *) "PUBLIC"))
  type = SGML_CATA_PUBLIC;
    else if (xmlStrEqual(name, (const xmlChar *) "DELEGATE"))
  type = SGML_CATA_DELEGATE;
    else if (xmlStrEqual(name, (const xmlChar *) "ENTITY"))
  type = SGML_CATA_ENTITY;
    else if (xmlStrEqual(name, (const xmlChar *) "DOCTYPE"))
  type = SGML_CATA_DOCTYPE;
    else if (xmlStrEqual(name, (const xmlChar *) "LINKTYPE"))
  type = SGML_CATA_LINKTYPE;
    else if (xmlStrEqual(name, (const xmlChar *) "NOTATION"))
  type = SGML_CATA_NOTATION;
    else if (xmlStrEqual(name, (const xmlChar *) "SGMLDECL"))
  type = SGML_CATA_SGMLDECL;
    else if (xmlStrEqual(name, (const xmlChar *) "DOCUMENT"))
  type = SGML_CATA_DOCUMENT;
    else if (xmlStrEqual(name, (const xmlChar *) "CATALOG"))
  type = SGML_CATA_CATALOG;
    else if (xmlStrEqual(name, (const xmlChar *) "BASE"))
  type = SGML_CATA_BASE;
    return(type);
}

/**
 * Parse an SGML catalog content and fill up the `catal` hash table with
 * the new entries found.
 *
 * @param catal  the SGML Catalog
 * @param value  the content of the SGML Catalog serialization
 * @param file  the filepath for the catalog
 * @param super  should this be handled as a Super Catalog in which case
 *          parsing is not recursive
 * @param depth  the current depth of the catalog
 * @returns 0 in case of success, -1 in case of error.
 */
static int
xmlParseSGMLCatalog(xmlCatalogPtr catal, const xmlChar *value,
              const char *file, int super, int depth) {
    const xmlChar *cur = value;
    xmlChar *base = NULL;
    int res;

    if ((cur == NULL) || (file == NULL))
        return(-1);

    /* Check recursion depth */
    if (depth > MAX_CATAL_DEPTH) {
        return(-1);
    }

    base = xmlStrdup((const xmlChar *) file);

    while ((cur != NULL) && (cur[0] != 0)) {
  SKIP_BLANKS;
  if (cur[0] == 0)
      break;
  if ((cur[0] == '-') && (cur[1] == '-')) {
      cur = xmlParseSGMLCatalogComment(cur);
      if (cur == NULL) {
    /* error */
    break;
      }
  } else {
      xmlChar *sysid = NULL;
      xmlChar *name = NULL;
      xmlCatalogEntryType type = XML_CATA_NONE;

      cur = xmlParseSGMLCatalogName(cur, &name);
      if (cur == NULL || name == NULL) {
    /* error */
    break;
      }
      if (!IS_BLANK_CH(*cur)) {
    /* error */
    xmlFree(name);
    break;
      }
      SKIP_BLANKS;
      if (xmlStrEqual(name, (const xmlChar *) "SYSTEM"))
                type = SGML_CATA_SYSTEM;
      else if (xmlStrEqual(name, (const xmlChar *) "PUBLIC"))
                type = SGML_CATA_PUBLIC;
      else if (xmlStrEqual(name, (const xmlChar *) "DELEGATE"))
                type = SGML_CATA_DELEGATE;
      else if (xmlStrEqual(name, (const xmlChar *) "ENTITY"))
                type = SGML_CATA_ENTITY;
      else if (xmlStrEqual(name, (const xmlChar *) "DOCTYPE"))
                type = SGML_CATA_DOCTYPE;
      else if (xmlStrEqual(name, (const xmlChar *) "LINKTYPE"))
                type = SGML_CATA_LINKTYPE;
      else if (xmlStrEqual(name, (const xmlChar *) "NOTATION"))
                type = SGML_CATA_NOTATION;
      else if (xmlStrEqual(name, (const xmlChar *) "SGMLDECL"))
                type = SGML_CATA_SGMLDECL;
      else if (xmlStrEqual(name, (const xmlChar *) "DOCUMENT"))
                type = SGML_CATA_DOCUMENT;
      else if (xmlStrEqual(name, (const xmlChar *) "CATALOG"))
                type = SGML_CATA_CATALOG;
      else if (xmlStrEqual(name, (const xmlChar *) "BASE"))
                type = SGML_CATA_BASE;
      else if (xmlStrEqual(name, (const xmlChar *) "OVERRIDE")) {
    xmlFree(name);
    cur = xmlParseSGMLCatalogName(cur, &name);
    if (name == NULL) {
        /* error */
        break;
    }
    xmlFree(name);
    continue;
      }
      xmlFree(name);
      name = NULL;

      switch(type) {
    case SGML_CATA_ENTITY:
        if (*cur == '%')
      type = SGML_CATA_PENTITY;
                    /* Falls through. */
    case SGML_CATA_PENTITY:
    case SGML_CATA_DOCTYPE:
    case SGML_CATA_LINKTYPE:
    case SGML_CATA_NOTATION:
        cur = xmlParseSGMLCatalogName(cur, &name);
        if (cur == NULL) {
      /* error */
      break;
        }
        if (!IS_BLANK_CH(*cur)) {
      /* error */
      break;
        }
        SKIP_BLANKS;
        cur = xmlParseSGMLCatalogPubid(cur, &sysid);
        if (cur == NULL) {
      /* error */
      break;
        }
        break;
    case SGML_CATA_PUBLIC:
    case SGML_CATA_SYSTEM:
    case SGML_CATA_DELEGATE:
        cur = xmlParseSGMLCatalogPubid(cur, &name);
        if (cur == NULL) {
      /* error */
      break;
        }
        if (type != SGML_CATA_SYSTEM) {
            xmlChar *normid;

            normid = xmlCatalogNormalizePublic(name);
            if (normid != NULL) {
                if (name != NULL)
                    xmlFree(name);
                if (*normid != 0)
                    name = normid;
                else {
                    xmlFree(normid);
                    name = NULL;
                }
            }
        }
        if (!IS_BLANK_CH(*cur)) {
      /* error */
      break;
        }
        SKIP_BLANKS;
        cur = xmlParseSGMLCatalogPubid(cur, &sysid);
        if (cur == NULL) {
      /* error */
      break;
        }
        break;
    case SGML_CATA_BASE:
    case SGML_CATA_CATALOG:
    case SGML_CATA_DOCUMENT:
    case SGML_CATA_SGMLDECL:
        cur = xmlParseSGMLCatalogPubid(cur, &sysid);
        if (cur == NULL) {
      /* error */
      break;
        }
        break;
    default:
        break;
      }
      if (cur == NULL) {
    if (name != NULL)
        xmlFree(name);
    if (sysid != NULL)
        xmlFree(sysid);
    break;
      } else if (type == SGML_CATA_BASE) {
    if (base != NULL)
        xmlFree(base);
    base = xmlStrdup(sysid);
      } else if ((type == SGML_CATA_PUBLIC) ||
           (type == SGML_CATA_SYSTEM)) {
    xmlChar *filename;

    filename = xmlBuildURI(sysid, base);
    if (filename != NULL) {
        xmlCatalogEntryPtr entry;

        entry = xmlNewCatalogEntry(type, name, filename,
                             NULL, XML_CATA_PREFER_NONE, NULL);
        res = xmlHashAddEntry(catal->sgml, name, entry);
        if (res < 0) {
      xmlFreeCatalogEntry(entry, NULL);
        }
        xmlFree(filename);
    }

      } else if (type == SGML_CATA_CATALOG) {
    if (super) {
        xmlCatalogEntryPtr entry;

        entry = xmlNewCatalogEntry(type, sysid, NULL, NULL,
                             XML_CATA_PREFER_NONE, NULL);
        res = xmlHashAddEntry(catal->sgml, sysid, entry);
        if (res < 0) {
      xmlFreeCatalogEntry(entry, NULL);
        }
    } else {
        xmlChar *filename;

        filename = xmlBuildURI(sysid, base);
        if (filename != NULL) {
      xmlExpandCatalog(catal, (const char *)filename, depth);
      xmlFree(filename);
        }
    }
      }
      /*
       * drop anything else we won't handle it
       */
      if (name != NULL)
    xmlFree(name);
      if (sysid != NULL)
    xmlFree(sysid);
  }
    }
    if (base != NULL)
  xmlFree(base);
    if (cur == NULL)
  return(-1);
    return(0);
}

/************************************************************************
 *                  *
 *      SGML Catalog handling       *
 *                  *
 ************************************************************************/

/**
 * Try to lookup the catalog local reference associated to a public ID
 *
 * @param catal  an SGML catalog hash
 * @param pubID  the public ID string
 * @returns the local resource if found or NULL otherwise.
 */
static const xmlChar *
xmlCatalogGetSGMLPublic(xmlHashTablePtr catal, const xmlChar *pubID) {
    xmlCatalogEntryPtr entry;
    xmlChar *normid;

    if (catal == NULL)
  return(NULL);

    normid = xmlCatalogNormalizePublic(pubID);
    if (normid != NULL)
        pubID = (*normid != 0 ? normid : NULL);

    entry = (xmlCatalogEntryPtr) xmlHashLookup(catal, pubID);
    if (entry == NULL) {
  if (normid != NULL)
      xmlFree(normid);
  return(NULL);
    }
    if (entry->type == SGML_CATA_PUBLIC) {
  if (normid != NULL)
      xmlFree(normid);
  return(entry->URL);
    }
    if (normid != NULL)
        xmlFree(normid);
    return(NULL);
}

/**
 * Try to lookup the catalog local reference for a system ID
 *
 * @param catal  an SGML catalog hash
 * @param sysID  the system ID string
 * @returns the local resource if found or NULL otherwise.
 */
static const xmlChar *
xmlCatalogGetSGMLSystem(xmlHashTablePtr catal, const xmlChar *sysID) {
    xmlCatalogEntryPtr entry;

    if (catal == NULL)
  return(NULL);

    entry = (xmlCatalogEntryPtr) xmlHashLookup(catal, sysID);
    if (entry == NULL)
  return(NULL);
    if (entry->type == SGML_CATA_SYSTEM)
  return(entry->URL);
    return(NULL);
}

/**
 * Do a complete resolution lookup of an External Identifier
 *
 * @param catal  the SGML catalog
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found
 */
static const xmlChar *
xmlCatalogSGMLResolve(xmlCatalogPtr catal, const xmlChar *pubID,
                const xmlChar *sysID) {
    const xmlChar *ret = NULL;

    if (catal->sgml == NULL)
  return(NULL);

    if (pubID != NULL)
  ret = xmlCatalogGetSGMLPublic(catal->sgml, pubID);
    if (ret != NULL)
  return(ret);
    if (sysID != NULL)
  ret = xmlCatalogGetSGMLSystem(catal->sgml, sysID);
    if (ret != NULL)
  return(ret);
    return(NULL);
}

#endif /* LIBXML_SGML_CATALOG_ENABLED */

/************************************************************************
 *                  *
 *      Specific Public interfaces      *
 *                  *
 ************************************************************************/

#ifdef LIBXML_SGML_CATALOG_ENABLED
/**
 * Load an SGML super catalog. It won't expand CATALOG or DELEGATE
 * references. This is only needed for manipulating SGML Super Catalogs
 * like adding and removing CATALOG or DELEGATE entries.
 *
 * @deprecated Internal function, don't use
 *
 * @param filename  a file path
 * @returns the catalog parsed or NULL in case of error
 */
xmlCatalog *
xmlLoadSGMLSuperCatalog(const char *filename)
{
    xmlChar *content;
    xmlCatalogPtr catal;
    int ret;

    content = xmlLoadFileContent(filename);
    if (content == NULL)
        return(NULL);

    catal = xmlCreateNewCatalog(XML_SGML_CATALOG_TYPE, xmlCatalogDefaultPrefer);
    if (catal == NULL) {
  xmlFree(content);
  return(NULL);
    }

    ret = xmlParseSGMLCatalog(catal, content, filename, 1, 0);
    xmlFree(content);
    if (ret < 0) {
  xmlFreeCatalog(catal);
  return(NULL);
    }
    return (catal);
}
#endif /* LIBXML_SGML_CATALOG_ENABLED */

/**
 * Load the catalog and build the associated data structures.
 * This can be either an XML Catalog or an SGML Catalog
 * It will recurse in SGML CATALOG entries. On the other hand XML
 * Catalogs are not handled recursively.
 *
 * @deprecated Internal function, don't use
 *
 * @param filename  a file path
 * @returns the catalog parsed or NULL in case of error
 */
xmlCatalog *
xmlLoadACatalog(const char *filename)
{
    xmlChar *content;
    xmlChar *first;
    xmlCatalogPtr catal;

    content = xmlLoadFileContent(filename);
    if (content == NULL)
        return(NULL);


    first = content;

    while ((*first != 0) && (*first != '-') && (*first != '<') &&
     (!(((*first >= 'A') && (*first <= 'Z')) ||
        ((*first >= 'a') && (*first <= 'z')))))
  first++;

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (*first != '<') {
        int ret;

  catal = xmlCreateNewCatalog(XML_SGML_CATALOG_TYPE, xmlCatalogDefaultPrefer);
  if (catal == NULL) {
      xmlFree(content);
      return(NULL);
  }
        ret = xmlParseSGMLCatalog(catal, content, filename, 0, 0);
  if (ret < 0) {
      xmlFreeCatalog(catal);
      xmlFree(content);
      return(NULL);
  }
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  catal = xmlCreateNewCatalog(XML_XML_CATALOG_TYPE, xmlCatalogDefaultPrefer);
  if (catal == NULL) {
      xmlFree(content);
      return(NULL);
  }
        catal->xml = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL,
           NULL, BAD_CAST filename, xmlCatalogDefaultPrefer, NULL);
    }
    xmlFree(content);
    return (catal);
}

/**
 * Load the catalog and expand the existing catal structure.
 * This can be either an XML Catalog or an SGML Catalog
 *
 * @param catal  a catalog
 * @param filename  a file path
 * @param depth  the current depth of the catalog
 * @returns 0 in case of success, -1 in case of error
 */
static int
xmlExpandCatalog(xmlCatalogPtr catal, const char *filename, int depth)
{
    if ((catal == NULL) || (filename == NULL))
  return(-1);

    /* Check recursion depth */
    if (depth > MAX_CATAL_DEPTH) {
  return(-1);
    }

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  xmlChar *content;
        int ret;

  content = xmlLoadFileContent(filename);
  if (content == NULL)
      return(-1);

        ret = xmlParseSGMLCatalog(catal, content, filename, 0, depth + 1);
  if (ret < 0) {
      xmlFree(content);
      return(-1);
  }
  xmlFree(content);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  xmlCatalogEntryPtr tmp, cur;
  tmp = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL,
           NULL, BAD_CAST filename, xmlCatalogDefaultPrefer, NULL);

  cur = catal->xml;
  if (cur == NULL) {
      catal->xml = tmp;
  } else {
      while (cur->next != NULL) cur = cur->next;
      cur->next = tmp;
  }
    }
    return (0);
}

/**
 * Try to lookup the catalog resource for a system ID
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param sysID  the system ID string
 * @returns the resource if found or NULL otherwise, the value returned
 *      must be freed by the caller.
 */
xmlChar *
xmlACatalogResolveSystem(xmlCatalog *catal, const xmlChar *sysID) {
    xmlChar *ret = NULL;

    if ((sysID == NULL) || (catal == NULL))
  return(NULL);

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Resolve sysID %s\n", sysID);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  const xmlChar *sgml;

  sgml = xmlCatalogGetSGMLSystem(catal->sgml, sysID);
  if (sgml != NULL)
      ret = xmlStrdup(sgml);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
        xmlResetCatalogResolveCache();
        ret = xmlCatalogListXMLResolve(catal->xml, NULL, sysID);
        xmlResetCatalogResolveCache();
  if (ret == XML_CATAL_BREAK)
      ret = NULL;
    }
    return(ret);
}

/**
 * Try to lookup the catalog local reference associated to a public ID in that catalog
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param pubID  the public ID string
 * @returns the local resource if found or NULL otherwise, the value returned
 *      must be freed by the caller.
 */
xmlChar *
xmlACatalogResolvePublic(xmlCatalog *catal, const xmlChar *pubID) {
    xmlChar *ret = NULL;

    if ((pubID == NULL) || (catal == NULL))
  return(NULL);

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Resolve pubID %s\n", pubID);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  const xmlChar *sgml;

  sgml = xmlCatalogGetSGMLPublic(catal->sgml, pubID);
  if (sgml != NULL)
      ret = xmlStrdup(sgml);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
        xmlResetCatalogResolveCache();
        ret = xmlCatalogListXMLResolve(catal->xml, pubID, NULL);
        xmlResetCatalogResolveCache();
  if (ret == XML_CATAL_BREAK)
      ret = NULL;
    }
    return(ret);
}

/**
 * Do a complete resolution lookup of an External Identifier
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlACatalogResolve(xmlCatalog *catal, const xmlChar * pubID,
                   const xmlChar * sysID)
{
    xmlChar *ret = NULL;

    if (((pubID == NULL) && (sysID == NULL)) || (catal == NULL))
        return (NULL);

    if (xmlDebugCatalogs) {
         if ((pubID != NULL) && (sysID != NULL)) {
             xmlCatalogPrintDebug(
                             "Resolve: pubID %s sysID %s\n", pubID, sysID);
         } else if (pubID != NULL) {
             xmlCatalogPrintDebug(
                             "Resolve: pubID %s\n", pubID);
         } else {
             xmlCatalogPrintDebug(
                             "Resolve: sysID %s\n", sysID);
         }
    }

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
        const xmlChar *sgml;

        sgml = xmlCatalogSGMLResolve(catal, pubID, sysID);
        if (sgml != NULL)
            ret = xmlStrdup(sgml);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
        xmlResetCatalogResolveCache();
        ret = xmlCatalogListXMLResolve(catal->xml, pubID, sysID);
        xmlResetCatalogResolveCache();

  if (ret == XML_CATAL_BREAK)
      ret = NULL;
    }
    return (ret);
}

/**
 * Do a complete resolution lookup of an URI
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param URI  the URI
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlACatalogResolveURI(xmlCatalog *catal, const xmlChar *URI) {
    xmlChar *ret = NULL;

    if ((URI == NULL) || (catal == NULL))
  return(NULL);

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Resolve URI %s\n", URI);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  const xmlChar *sgml;

  sgml = xmlCatalogSGMLResolve(catal, NULL, URI);
  if (sgml != NULL)
            ret = xmlStrdup(sgml);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  ret = xmlCatalogListXMLResolveURI(catal->xml, URI);
  if (ret == XML_CATAL_BREAK)
      ret = NULL;
    }
    return(ret);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * Dump the given catalog to the given file.
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param out  the file.
 */
void
xmlACatalogDump(xmlCatalog *catal, FILE *out) {
    if ((out == NULL) || (catal == NULL))
  return;

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  xmlHashScan(catal->sgml, xmlCatalogDumpEntry, out);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  xmlDumpXMLCatalog(out, catal->xml);
    }
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * Add an entry in the catalog, it may overwrite existing but
 * different entries.
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param type  the type of record to add to the catalog
 * @param orig  the system, public or prefix to match
 * @param replace  the replacement value for the match
 * @returns 0 if successful, -1 otherwise
 */
int
xmlACatalogAdd(xmlCatalog *catal, const xmlChar * type,
              const xmlChar * orig, const xmlChar * replace)
{
    int res = -1;

    if (catal == NULL)
  return(-1);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
        xmlCatalogEntryType cattype;

        cattype = xmlGetSGMLCatalogEntryType(type);
        if (cattype != XML_CATA_NONE) {
            xmlCatalogEntryPtr entry;

            entry = xmlNewCatalogEntry(cattype, orig, replace, NULL,
                                       XML_CATA_PREFER_NONE, NULL);
      if (catal->sgml == NULL)
    catal->sgml = xmlHashCreate(10);
            res = xmlHashAddEntry(catal->sgml, orig, entry);
            if (res < 0)
                xmlFreeCatalogEntry(entry, NULL);
        }
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
        res = xmlAddXMLCatalog(catal->xml, type, orig, replace);
    }
    return (res);
}

/**
 * Remove an entry from the catalog
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  a Catalog
 * @param value  the value to remove
 * @returns the number of entries removed if successful, -1 otherwise
 */
int
xmlACatalogRemove(xmlCatalog *catal, const xmlChar *value) {
    int res = -1;

    if ((catal == NULL) || (value == NULL))
  return(-1);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  res = xmlHashRemoveEntry(catal->sgml, value, xmlFreeCatalogEntry);
  if (res == 0)
      res = 1;
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  res = xmlDelXMLCatalog(catal->xml, value);
    }
    return(res);
}

/**
 * create a new Catalog.
 *
 * @deprecated Internal function, don't use
 *
 * @param sgml  should this create an SGML catalog
 * @returns the xmlCatalog or NULL in case of error
 */
xmlCatalog *
xmlNewCatalog(int sgml) {
    xmlCatalogPtr catal = NULL;

    (void) sgml;

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (sgml) {
  catal = xmlCreateNewCatalog(XML_SGML_CATALOG_TYPE,
                        xmlCatalogDefaultPrefer);
        if ((catal != NULL) && (catal->sgml == NULL))
      catal->sgml = xmlHashCreate(10);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  catal = xmlCreateNewCatalog(XML_XML_CATALOG_TYPE,
                        xmlCatalogDefaultPrefer);
    }
    return(catal);
}

/**
 * Check is a catalog is empty
 *
 * @deprecated Internal function, don't use
 *
 * @param catal  should this create an SGML catalog
 * @returns 1 if the catalog is empty, 0 if not, amd -1 in case of error.
 */
int
xmlCatalogIsEmpty(xmlCatalog *catal) {
    if (catal == NULL)
  return(-1);

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (catal->type == XML_SGML_CATALOG_TYPE) {
  int res;

  if (catal->sgml == NULL)
      return(1);
  res = xmlHashSize(catal->sgml);
  if (res == 0)
      return(1);
  if (res < 0)
      return(-1);
    } else
#endif /* LIBXML_SGML_CATALOG_ENABLED */
    {
  if (catal->xml == NULL)
      return(1);
  if ((catal->xml->type != XML_CATA_CATALOG) &&
      (catal->xml->type != XML_CATA_BROKEN_CATALOG))
      return(-1);
  if (catal->xml->children == NULL)
      return(1);
        return(0);
    }
    return(0);
}

/************************************************************************
 *                  *
 *   Public interfaces manipulating the global shared default catalog *
 *                  *
 ************************************************************************/

/**
 * Do the catalog initialization only of global data, doesn't try to load
 * any catalog actually.
 */
void
xmlInitCatalogInternal(void) {
    if (getenv("XML_DEBUG_CATALOG"))
  xmlDebugCatalogs = 1;
    xmlInitRMutex(&xmlCatalogMutex);
}

/**
 * Load the default system catalog.
 */
void
xmlInitializeCatalog(void) {
    if (xmlCatalogInitialized != 0)
  return;

    xmlInitParser();

    xmlRMutexLock(&xmlCatalogMutex);

    if (xmlDefaultCatalog == NULL) {
  const char *catalogs;
  char *path;
  const char *cur, *paths;
  xmlCatalogPtr catal;
  xmlCatalogEntryPtr *nextent;

  catalogs = (const char *) getenv("XML_CATALOG_FILES");
  if (catalogs == NULL)
      catalogs = XML_XML_DEFAULT_CATALOG;

  catal = xmlCreateNewCatalog(XML_XML_CATALOG_TYPE,
    xmlCatalogDefaultPrefer);
  if (catal != NULL) {
      /* the XML_CATALOG_FILES envvar is allowed to contain a
         space-separated list of entries. */
      cur = catalogs;
      nextent = &catal->xml;
      while (*cur != '\0') {
    while (xmlIsBlank_ch(*cur))
        cur++;
    if (*cur != 0) {
        paths = cur;
        while ((*cur != 0) && (!xmlIsBlank_ch(*cur)))
      cur++;
        path = (char *) xmlStrndup((const xmlChar *)paths, cur - paths);
        if (path != NULL) {
      *nextent = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL,
        NULL, BAD_CAST path, xmlCatalogDefaultPrefer, NULL);
      if (*nextent != NULL)
          nextent = &((*nextent)->next);
      xmlFree(path);
        }
    }
      }
      xmlDefaultCatalog = catal;
  }
    }

    xmlRMutexUnlock(&xmlCatalogMutex);

    xmlCatalogInitialized = 1;
}


/**
 * Load the catalog and makes its definitions effective for the default
 * external entity loader. It will recurse in SGML CATALOG entries.
 * this function is not thread safe, catalog initialization should
 * preferably be done once at startup
 *
 * @param filename  a file path
 * @returns 0 in case of success -1 in case of error
 */
int
xmlLoadCatalog(const char *filename)
{
    int ret;
    xmlCatalogPtr catal;

    xmlInitParser();

    xmlRMutexLock(&xmlCatalogMutex);

    if (xmlDefaultCatalog == NULL) {
  catal = xmlLoadACatalog(filename);
  if (catal == NULL) {
      xmlRMutexUnlock(&xmlCatalogMutex);
      return(-1);
  }

  xmlDefaultCatalog = catal;
  xmlRMutexUnlock(&xmlCatalogMutex);
        xmlCatalogInitialized = 1;
  return(0);
    }

    ret = xmlExpandCatalog(xmlDefaultCatalog, filename, 0);
    xmlRMutexUnlock(&xmlCatalogMutex);
    return(ret);
}

/**
 * Load the catalogs and makes their definitions effective for the default
 * external entity loader.
 * this function is not thread safe, catalog initialization should
 * preferably be done once at startup
 *
 * @param pathss  a list of directories separated by a colon or a space.
 */
void
xmlLoadCatalogs(const char *pathss) {
    const char *cur;
    const char *paths;
    xmlChar *path;
#ifdef LIBXML2_WINPATH_ENABLED
    int i, iLen;
#endif

    if (pathss == NULL)
  return;

    cur = pathss;
    while (*cur != 0) {
  while (xmlIsBlank_ch(*cur)) cur++;
  if (*cur != 0) {
      paths = cur;
      while ((*cur != 0) && (*cur != PATH_SEPARATOR) && (!xmlIsBlank_ch(*cur)))
    cur++;
      path = xmlStrndup((const xmlChar *)paths, cur - paths);
      if (path != NULL) {
#ifdef LIBXML2_WINPATH_ENABLED
        iLen = strlen((const char*)path);
        for(i = 0; i < iLen; i++) {
            if(path[i] == '\\') {
                path[i] = '/';
            }
        }
#endif
    xmlLoadCatalog((const char *) path);
    xmlFree(path);
      }
  }
  while (*cur == PATH_SEPARATOR)
      cur++;
    }
}

/**
 * Free up all the memory associated with catalogs
 */
void
xmlCatalogCleanup(void) {
    xmlRMutexLock(&xmlCatalogMutex);
    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Catalogs cleanup\n");
    if (xmlCatalogXMLFiles != NULL)
  xmlHashFree(xmlCatalogXMLFiles, xmlFreeCatalogHashEntryList);
    xmlCatalogXMLFiles = NULL;
    if (xmlDefaultCatalog != NULL)
  xmlFreeCatalog(xmlDefaultCatalog);
    xmlDefaultCatalog = NULL;
    xmlDebugCatalogs = 0;
    xmlCatalogInitialized = 0;
    xmlRMutexUnlock(&xmlCatalogMutex);
}

/**
 * Free global data.
 */
void
xmlCleanupCatalogInternal(void) {
    xmlCleanupRMutex(&xmlCatalogMutex);
}

/**
 * Try to lookup the catalog resource for a system ID
 *
 * @param sysID  the system ID string
 * @returns the resource if found or NULL otherwise, the value returned
 *      must be freed by the caller.
 */
xmlChar *
xmlCatalogResolveSystem(const xmlChar *sysID) {
    xmlChar *ret;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    ret = xmlACatalogResolveSystem(xmlDefaultCatalog, sysID);
    return(ret);
}

/**
 * Try to lookup the catalog reference associated to a public ID
 *
 * @param pubID  the public ID string
 * @returns the resource if found or NULL otherwise, the value returned
 *      must be freed by the caller.
 */
xmlChar *
xmlCatalogResolvePublic(const xmlChar *pubID) {
    xmlChar *ret;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    ret = xmlACatalogResolvePublic(xmlDefaultCatalog, pubID);
    return(ret);
}

/**
 * Do a complete resolution lookup of an External Identifier
 *
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlCatalogResolve(const xmlChar *pubID, const xmlChar *sysID) {
    xmlChar *ret;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    ret = xmlACatalogResolve(xmlDefaultCatalog, pubID, sysID);
    return(ret);
}

/**
 * Do a complete resolution lookup of an URI
 *
 * @param URI  the URI
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlCatalogResolveURI(const xmlChar *URI) {
    xmlChar *ret;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    ret = xmlACatalogResolveURI(xmlDefaultCatalog, URI);
    return(ret);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * Dump all the global catalog content to the given file.
 *
 * @param out  the file.
 */
void
xmlCatalogDump(FILE *out) {
    if (out == NULL)
  return;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    xmlACatalogDump(xmlDefaultCatalog, out);
}

/**
 * Dump all the global catalog content as a xmlDoc
 * This function is just for testing/debugging purposes
 *
 * @returns  The catalog as xmlDoc or NULL if failed, it must be freed by the caller.
 */
xmlDocPtr
xmlCatalogDumpDoc(void) {
    if (!xmlCatalogInitialized)
        xmlInitializeCatalog();

    return xmlDumpXMLCatalogToDoc(xmlDefaultCatalog->xml);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * Add an entry in the catalog, it may overwrite existing but
 * different entries.
 * If called before any other catalog routine, allows to override the
 * default shared catalog put in place by #xmlInitializeCatalog;
 *
 * @param type  the type of record to add to the catalog
 * @param orig  the system, public or prefix to match
 * @param replace  the replacement value for the match
 * @returns 0 if successful, -1 otherwise
 */
int
xmlCatalogAdd(const xmlChar *type, const xmlChar *orig, const xmlChar *replace) {
    int res = -1;

    xmlInitParser();

    xmlRMutexLock(&xmlCatalogMutex);
    /*
     * Specific case where one want to override the default catalog
     * put in place by xmlInitializeCatalog();
     */
    if ((xmlDefaultCatalog == NULL) &&
  (xmlStrEqual(type, BAD_CAST "catalog"))) {
  xmlDefaultCatalog = xmlCreateNewCatalog(XML_XML_CATALOG_TYPE,
                              xmlCatalogDefaultPrefer);
  if (xmlDefaultCatalog != NULL) {
     xmlDefaultCatalog->xml = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL,
            orig, NULL,  xmlCatalogDefaultPrefer, NULL);
  }
  xmlRMutexUnlock(&xmlCatalogMutex);
        xmlCatalogInitialized = 1;
  return(0);
    }

    res = xmlACatalogAdd(xmlDefaultCatalog, type, orig, replace);
    xmlRMutexUnlock(&xmlCatalogMutex);
    return(res);
}

/**
 * Remove an entry from the catalog
 *
 * @param value  the value to remove
 * @returns the number of entries removed if successful, -1 otherwise
 */
int
xmlCatalogRemove(const xmlChar *value) {
    int res;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    xmlRMutexLock(&xmlCatalogMutex);
    res = xmlACatalogRemove(xmlDefaultCatalog, value);
    xmlRMutexUnlock(&xmlCatalogMutex);
    return(res);
}

#ifdef LIBXML_SGML_CATALOG_ENABLED
/**
 * Convert all the SGML catalog entries as XML ones
 *
 * @returns the number of entries converted if successful, -1 otherwise
 */
int
xmlCatalogConvert(void) {
    int res = -1;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    xmlRMutexLock(&xmlCatalogMutex);
    res = xmlConvertSGMLCatalog(xmlDefaultCatalog);
    xmlRMutexUnlock(&xmlCatalogMutex);
    return(res);
}
#endif /* LIBXML_SGML_CATALOG_ENABLED */

/************************************************************************
 *                  *
 *  Public interface manipulating the common preferences    *
 *                  *
 ************************************************************************/

/**
 * Used to get the user preference w.r.t. to what catalogs should
 * be accepted
 *
 * @deprecated Use XML_PARSE_NO_SYS_CATALOG and
 * XML_PARSE_CATALOG_PI.
 *
 * @returns the current xmlCatalogAllow value
 */
xmlCatalogAllow
xmlCatalogGetDefaults(void) {
    return(xmlCatalogDefaultAllow);
}

/**
 * Used to set the user preference w.r.t. to what catalogs should
 * be accepted
 *
 * @deprecated Use XML_PARSE_NO_SYS_CATALOG and
 * XML_PARSE_CATALOG_PI.
 *
 * @param allow  what catalogs should be accepted
 */
void
xmlCatalogSetDefaults(xmlCatalogAllow allow) {
    if (xmlDebugCatalogs) {
  switch (allow) {
      case XML_CATA_ALLOW_NONE:
    xmlCatalogPrintDebug(
      "Disabling catalog usage\n");
    break;
      case XML_CATA_ALLOW_GLOBAL:
    xmlCatalogPrintDebug(
      "Allowing only global catalogs\n");
    break;
      case XML_CATA_ALLOW_DOCUMENT:
    xmlCatalogPrintDebug(
      "Allowing only catalogs from the document\n");
    break;
      case XML_CATA_ALLOW_ALL:
    xmlCatalogPrintDebug(
      "Allowing all catalogs\n");
    break;
  }
    }
    xmlCatalogDefaultAllow = allow;
}

/**
 * Allows to set the preference between public and system for deletion
 * in XML Catalog resolution. C.f. section 4.1.1 of the spec
 * Values accepted are XML_CATA_PREFER_PUBLIC or XML_CATA_PREFER_SYSTEM
 *
 * @deprecated This setting is global and not thread-safe.
 *
 * @param prefer  the default preference for delegation
 * @returns the previous value of the default preference for delegation
 */
xmlCatalogPrefer
xmlCatalogSetDefaultPrefer(xmlCatalogPrefer prefer) {
    xmlCatalogPrefer ret = xmlCatalogDefaultPrefer;

    if (prefer == XML_CATA_PREFER_NONE)
  return(ret);

    if (xmlDebugCatalogs) {
  switch (prefer) {
      case XML_CATA_PREFER_PUBLIC:
    xmlCatalogPrintDebug(
      "Setting catalog preference to PUBLIC\n");
    break;
      case XML_CATA_PREFER_SYSTEM:
    xmlCatalogPrintDebug(
      "Setting catalog preference to SYSTEM\n");
    break;
      default:
    return(ret);
  }
    }
    xmlCatalogDefaultPrefer = prefer;
    return(ret);
}

/**
 * Used to set the debug level for catalog operation, 0 disable
 * debugging, 1 enable it
 *
 * @param level  the debug level of catalogs required
 * @returns the previous value of the catalog debugging level
 */
int
xmlCatalogSetDebug(int level) {
    int ret = xmlDebugCatalogs;

    if (level <= 0)
        xmlDebugCatalogs = 0;
    else
  xmlDebugCatalogs = level;
    return(ret);
}

/************************************************************************
 *                  *
 *   Minimal interfaces used for per-document catalogs by the parser  *
 *                  *
 ************************************************************************/

/**
 * Free up the memory associated to the catalog list
 *
 * @param catalogs  a document's list of catalogs
 */
void
xmlCatalogFreeLocal(void *catalogs) {
    xmlCatalogEntryPtr catal;

    catal = (xmlCatalogEntryPtr) catalogs;
    if (catal != NULL)
  xmlFreeCatalogEntryList(catal);
}


/**
 * Add the new entry to the catalog list
 *
 * @param catalogs  a document's list of catalogs
 * @param URL  the URL to a new local catalog
 * @returns the updated list
 */
void *
xmlCatalogAddLocal(void *catalogs, const xmlChar *URL) {
    xmlCatalogEntryPtr catal, add;

    xmlInitParser();

    if (URL == NULL)
  return(catalogs);

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Adding document catalog %s\n", URL);

    add = xmlNewCatalogEntry(XML_CATA_CATALOG, NULL, URL, NULL,
                       xmlCatalogDefaultPrefer, NULL);
    if (add == NULL)
  return(catalogs);

    catal = (xmlCatalogEntryPtr) catalogs;
    if (catal == NULL)
  return((void *) add);

    while (catal->next != NULL)
  catal = catal->next;
    catal->next = add;
    return(catalogs);
}

/**
 * Do a complete resolution lookup of an External Identifier using a
 * document's private catalog list
 *
 * @param catalogs  a document's list of catalogs
 * @param pubID  the public ID string
 * @param sysID  the system ID string
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlCatalogLocalResolve(void *catalogs, const xmlChar *pubID,
                 const xmlChar *sysID) {
    xmlCatalogEntryPtr catal;
    xmlChar *ret;

    if ((pubID == NULL) && (sysID == NULL))
  return(NULL);

    if (xmlDebugCatalogs) {
        if ((pubID != NULL) && (sysID != NULL)) {
            xmlCatalogPrintDebug(
                            "Local Resolve: pubID %s sysID %s\n", pubID, sysID);
        } else if (pubID != NULL) {
            xmlCatalogPrintDebug(
                            "Local Resolve: pubID %s\n", pubID);
        } else {
            xmlCatalogPrintDebug(
                            "Local Resolve: sysID %s\n", sysID);
        }
    }

    catal = (xmlCatalogEntryPtr) catalogs;
    if (catal == NULL)
  return(NULL);
    xmlResetCatalogResolveCache();
    ret = xmlCatalogListXMLResolve(catal, pubID, sysID);
    xmlResetCatalogResolveCache();
    if ((ret != NULL) && (ret != XML_CATAL_BREAK))
  return(ret);
    return(NULL);
}

/**
 * Do a complete resolution lookup of an URI using a
 * document's private catalog list
 *
 * @param catalogs  a document's list of catalogs
 * @param URI  the URI
 * @returns the URI of the resource or NULL if not found, it must be freed
 *      by the caller.
 */
xmlChar *
xmlCatalogLocalResolveURI(void *catalogs, const xmlChar *URI) {
    xmlCatalogEntryPtr catal;
    xmlChar *ret;

    if (URI == NULL)
  return(NULL);

    if (xmlDebugCatalogs)
  xmlCatalogPrintDebug(
    "Resolve URI %s\n", URI);

    catal = (xmlCatalogEntryPtr) catalogs;
    if (catal == NULL)
  return(NULL);
    ret = xmlCatalogListXMLResolveURI(catal, URI);
    if ((ret != NULL) && (ret != XML_CATAL_BREAK))
  return(ret);
    return(NULL);
}

/************************************************************************
 *                  *
 *      Deprecated interfaces       *
 *                  *
 ************************************************************************/
/**
 * Try to lookup the catalog reference associated to a system ID
 *
 * @deprecated use #xmlCatalogResolveSystem
 *
 * @param sysID  the system ID string
 * @returns the resource if found or NULL otherwise.
 */
const xmlChar *
xmlCatalogGetSystem(const xmlChar *sysID) {
    xmlChar *ret;
    static xmlChar result[1000];
    static int msg = 0;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    if (msg == 0) {
  xmlPrintErrorMessage(
    "Use of deprecated xmlCatalogGetSystem() call\n");
  msg++;
    }

    if (sysID == NULL)
  return(NULL);

    /*
     * Check first the XML catalogs
     */
    if (xmlDefaultCatalog != NULL) {
        xmlResetCatalogResolveCache();
        ret = xmlCatalogListXMLResolve(xmlDefaultCatalog->xml, NULL, sysID);
        xmlResetCatalogResolveCache();
  if ((ret != NULL) && (ret != XML_CATAL_BREAK)) {
      snprintf((char *) result, sizeof(result) - 1, "%s", (char *) ret);
      result[sizeof(result) - 1] = 0;
      return(result);
  }
    }

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (xmlDefaultCatalog != NULL)
  return(xmlCatalogGetSGMLSystem(xmlDefaultCatalog->sgml, sysID));
#endif
    return(NULL);
}

/**
 * Try to lookup the catalog reference associated to a public ID
 *
 * @deprecated use #xmlCatalogResolvePublic
 *
 * @param pubID  the public ID string
 * @returns the resource if found or NULL otherwise.
 */
const xmlChar *
xmlCatalogGetPublic(const xmlChar *pubID) {
    xmlChar *ret;
    static xmlChar result[1000];
    static int msg = 0;

    if (!xmlCatalogInitialized)
  xmlInitializeCatalog();

    if (msg == 0) {
  xmlPrintErrorMessage(
    "Use of deprecated xmlCatalogGetPublic() call\n");
  msg++;
    }

    if (pubID == NULL)
  return(NULL);

    /*
     * Check first the XML catalogs
     */
    if (xmlDefaultCatalog != NULL) {
        xmlResetCatalogResolveCache();
        ret = xmlCatalogListXMLResolve(xmlDefaultCatalog->xml, pubID, NULL);
        xmlResetCatalogResolveCache();
  if ((ret != NULL) && (ret != XML_CATAL_BREAK)) {
      snprintf((char *) result, sizeof(result) - 1, "%s", (char *) ret);
      result[sizeof(result) - 1] = 0;
      return(result);
  }
    }

#ifdef LIBXML_SGML_CATALOG_ENABLED
    if (xmlDefaultCatalog != NULL)
  return(xmlCatalogGetSGMLPublic(xmlDefaultCatalog->sgml, pubID));
#endif
    return(NULL);
}

#endif /* LIBXML_CATALOG_ENABLED */

Coverage Report

Created: 2026-02-26 06:55