/* Copyright (C) 2001-2025 Artifex Software, Inc.

   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or

   implied.

   This software is distributed under license and may not be copied,

   modified or distributed except as expressly authorized under the terms

   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact

   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,

   CA 94129, USA, for further information.

*/

/*

 * This is a DSC parser, based on the DSC 3.0 spec,

 * with a few DSC 2.1 additions for page size.

 *

 * Current limitations:

 * %%+ may be used after any comment in the comment or trailer,

 * but is currently only supported by

 *   %%DocumentMedia

 *

 * DSC 2.1 additions (discontinued in DSC 3.0):

 * %%DocumentPaperColors:

 * %%DocumentPaperForms:

 * %%DocumentPaperSizes:

 * %%DocumentPaperWeights:

 * %%PaperColor:   (ignored)

 * %%PaperForm:    (ignored)

 * %%PaperSize:

 * %%PaperWeight:  (ignored)

 *

 * Other additions for defaults or page section

 % %%ViewingOrientation: xx xy yx yy

*/

#include <stdio_.h> /* for sprintf(), not file I/O */

#include <stdlib.h>

#include <string_.h>

#include <ctype.h>

#define MAXSTR 256

#include "dscparse.h"

/* Macros for comparing string literals

 * For maximum speed, the length of the second macro argument is

 * computed at compile time.

 * THE SECOND MACRO ARGUMENT MUST BE A STRING LITERAL.

 */

#define COMPARE(p,str) (strncmp((const char *)(p), (str), sizeof(str)-1)==0)

#define IS_DSC(line, str) (COMPARE((line), (str)))

/* Macros for comparing the first one or two characters */

#define IS_WHITE(ch) (((ch)==' ') || ((ch)=='\t'))

#define IS_EOL(ch) (((ch)=='\r') || ((ch)=='\n'))

#define IS_WHITE_OR_EOL(ch) (IS_WHITE(ch) || IS_EOL(ch))

#define IS_BLANK(str) (IS_EOL(str[0]))

#define NOT_DSC_LINE(str) (((str)[0]!='%') || ((str)[1]!='%'))

/* Macros for document offset to start and end of line */

#define DSC_START(dsc)  ((dsc)->data_offset + (dsc)->data_index - (dsc)->line_length)

#define DSC_END(dsc)  ((dsc)->data_offset + (dsc)->data_index)

/* dsc_scan_SECTION() functions return one of

 * CDSC_ERROR, CDSC_OK, CDSC_NOTDSC

 * or one of the following

 */

/* The line should be passed on to the next section parser. */

#define CDSC_PROPAGATE  10

/* If document is DOS EPS and we haven't read 30 bytes, ask for more. */

#define CDSC_NEEDMORE 11

/* local prototypes */

static void * dsc_memalloc(CDSC *dsc, size_t size);

static void dsc_memfree(CDSC*dsc, void *ptr);

static CDSC * dsc_init2(CDSC *dsc);

static void dsc_reset(CDSC *dsc);

static void dsc_section_join(DSC_OFFSET begin, DSC_OFFSET *pend, DSC_OFFSET **pplast);

static int dsc_read_line(CDSC *dsc);

static int dsc_read_doseps(CDSC *dsc);

static int dsc_read_macbin(CDSC *dsc);

static int dsc_read_applesingle(CDSC *dsc);

static char * dsc_alloc_string(CDSC *dsc, const char *str, int len);

static char * dsc_add_line(CDSC *dsc, const char *line, unsigned int len);

static char * dsc_copy_string(char *str, unsigned int slen,

    char *line, unsigned int len, unsigned int *offset);

static GSDWORD dsc_get_dword(const unsigned char *buf);

static GSWORD dsc_get_word(const unsigned char *buf);

static GSDWORD dsc_get_bigendian_dword(const unsigned char *buf);

static GSWORD dsc_get_bigendian_word(const unsigned char *buf);

static int dsc_get_int(const char *line, unsigned int len, unsigned int *offset);

static float dsc_get_real(const char *line, unsigned int len,

    unsigned int *offset);

static void dsc_unknown(CDSC *dsc);

static GSBOOL dsc_is_section(char *line);

static int dsc_parse_pages(CDSC *dsc);

static int dsc_parse_bounding_box(CDSC *dsc, CDSCBBOX** pbbox, int offset);

static int dsc_parse_float_bounding_box(CDSC *dsc, CDSCFBBOX** pfbbox, int offset);

static int dsc_parse_orientation(CDSC *dsc, unsigned int *porientation,

    int offset);

static int dsc_parse_order(CDSC *dsc);

static int dsc_parse_media(CDSC *dsc, const CDSCMEDIA **page_media);

static int dsc_parse_document_media(CDSC *dsc);

static int dsc_parse_viewing_orientation(CDSC *dsc, CDSCCTM **pctm);

static int dsc_parse_page(CDSC *dsc);

static void dsc_save_line(CDSC *dsc);

static int dsc_scan_type(CDSC *dsc);

static int dsc_scan_comments(CDSC *dsc);

static int dsc_scan_preview(CDSC *dsc);

static int dsc_scan_defaults(CDSC *dsc);

static int dsc_scan_prolog(CDSC *dsc);

static int dsc_scan_setup(CDSC *dsc);

static int dsc_scan_page(CDSC *dsc);

static int dsc_scan_trailer(CDSC *dsc);

static int dsc_error(CDSC *dsc, unsigned int explanation,

    char *line, unsigned int line_len);

static int dsc_dcs2_fixup(CDSC *dsc);

static int dsc_parse_platefile(CDSC *dsc);

static int dsc_parse_dcs1plate(CDSC *dsc);

static CDSCCOLOUR * dsc_find_colour(CDSC *dsc, const char *colourname);

static int dsc_parse_process_colours(CDSC *dsc);

static int dsc_parse_custom_colours(CDSC *dsc);

static int dsc_parse_cmyk_custom_colour(CDSC *dsc);

static int dsc_parse_rgb_custom_colour(CDSC *dsc);

/* DSC error reporting */

static const int dsc_severity[] = {

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_BBOX */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_EARLY_TRAILER */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_EARLY_EOF */

    CDSC_ERROR_ERROR,   /* CDSC_MESSAGE_PAGE_IN_TRAILER */

    CDSC_ERROR_ERROR,   /* CDSC_MESSAGE_PAGE_ORDINAL */

    CDSC_ERROR_ERROR,   /* CDSC_MESSAGE_PAGES_WRONG */

    CDSC_ERROR_ERROR,   /* CDSC_MESSAGE_EPS_NO_BBOX */

    CDSC_ERROR_ERROR,   /* CDSC_MESSAGE_EPS_PAGES */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_NO_MEDIA */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_ATEND */

    CDSC_ERROR_INFORM,  /* CDSC_MESSAGE_DUP_COMMENT */

    CDSC_ERROR_INFORM,  /* CDSC_MESSAGE_DUP_TRAILER */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_BEGIN_END */

    CDSC_ERROR_INFORM,  /* CDSC_MESSAGE_BAD_SECTION */

    CDSC_ERROR_INFORM,  /* CDSC_MESSAGE_LONG_LINE */

    CDSC_ERROR_WARN,  /* CDSC_MESSAGE_INCORRECT_USAGE */

    0

};

#define DSC_MAX_ERROR ((sizeof(dsc_severity) / sizeof(int))-2)

const CDSCMEDIA dsc_known_media[CDSC_KNOWN_MEDIA] = {

    /* These sizes taken from Ghostscript gs_statd.ps */

    {"11x17", 792, 1224, 0, NULL, NULL},

    {"A3", 842, 1190, 0, NULL, NULL},

    {"A4", 595, 842, 0, NULL, NULL},

    {"A5", 421, 595, 0, NULL, NULL},

    {"B4", 709, 1002, 0, NULL, NULL}, /* ISO, but not Adobe standard */

    {"B5", 501, 709, 0, NULL, NULL},  /* ISO, but not Adobe standard */

    {"Ledger", 1224, 792, 0, NULL, NULL},

    {"Legal", 612, 1008, 0, NULL, NULL},

    {"Letter", 612, 792, 0, NULL, NULL},

    {"Note", 612, 792, 0, NULL, NULL},

    {NULL, 0, 0, 0, NULL, NULL}

};

/* parser state */

enum CDSC_SCAN_SECTION {

    scan_none = 0,

    scan_comments = 1,

    scan_pre_preview = 2,

    scan_preview = 3,

    scan_pre_defaults = 4,

    scan_defaults = 5,

    scan_pre_prolog = 6,

    scan_prolog = 7,

    scan_pre_setup = 8,

    scan_setup = 9,

    scan_pre_pages = 10,

    scan_pages = 11,

    scan_pre_trailer = 12,

    scan_trailer = 13,

    scan_eof = 14

};

static const char * const dsc_scan_section_name[15] = {

 "Type", "Comments",

 "pre-Preview", "Preview",

 "pre-Defaults", "Defaults",

 "pre-Prolog", "Prolog",

 "pre-Setup", "Setup",

 "pre-Page", "Page",

 "pre-Trailer", "Trailer",

 "EOF"

};

/******************************************************************/

/* Public functions                                               */

/******************************************************************/

/* constructor */

CDSC *

dsc_init(void *caller_data)

{

    CDSC *dsc = (CDSC *)malloc(sizeof(CDSC));

    if (dsc == NULL)

        return NULL;

    memset(dsc, 0, sizeof(CDSC));

    dsc->caller_data = caller_data;

    dsc->ref_count = 0;

    dsc_ref(dsc);

    return dsc_init2(dsc);

}

/* constructor, with caller supplied memalloc */

CDSC *

dsc_init_with_alloc(

    void *caller_data,

    void *(*memalloc)(size_t size, void *closure_data),

    void (*memfree)(void *ptr, void *closure_data),

    void *closure_data)

{

    CDSC *dsc = (CDSC *)memalloc(sizeof(CDSC), closure_data);

    if (dsc == NULL)

        return NULL;

    memset(dsc, 0, sizeof(CDSC));

    dsc->caller_data = caller_data;

    dsc->memalloc = memalloc;

    dsc->memfree = memfree;

    dsc->mem_closure_data = closure_data;

    dsc->ref_count = 0;

    dsc_ref(dsc);

    return dsc_init2(dsc);

}

/* destructor */

void

dsc_free(CDSC *dsc)

{

    if (dsc == NULL)

        return;

    dsc_reset(dsc);

    dsc_memfree(dsc, dsc);

}

CDSC *

dsc_new(void *caller_data)

{

    return dsc_init(caller_data);

}

int

dsc_ref(CDSC *dsc)

{

    return ++(dsc->ref_count);

}

int

dsc_unref(CDSC *dsc)

{

    if (dsc->ref_count <= 0)

        return -1;

    dsc->ref_count--;

    if (dsc->ref_count == 0) {

        dsc_free(dsc);

        return 0;

    }

    return dsc->ref_count;

}

/* Tell DSC parser how long document will be, to allow ignoring

 * of early %%Trailer and %%EOF.  This is optional.

 */

void

dsc_set_length(CDSC *dsc, DSC_OFFSET len)

{

    dsc->file_length = len;

}

/* Process a buffer containing DSC comments and PostScript */

/* Return value is < 0 for error, >=0 for OK.

 *  CDSC_ERROR

 *  CDSC_OK

 *  CDSC_NOTDSC (DSC will be ignored)

 *  other values indicate the last DSC comment read

 */

int

dsc_scan_data(CDSC *dsc, const char *data, int length)

{

    int bytes_read;

    int code = 0;

    if (dsc == NULL)

        return CDSC_ERROR;

    if (dsc->id == CDSC_NOTDSC)

        return CDSC_NOTDSC;

    dsc->id = CDSC_OK;

    if (dsc->eof)

        return CDSC_OK; /* ignore */

    if (length == 0) {

        /* EOF, so process what remains */

        dsc->eof = TRUE;

    }

    do {

        if (dsc->id == CDSC_NOTDSC)

            break;

        if (length != 0) {

            /* move existing data if needed */

            if (dsc->data_length > CDSC_DATA_LENGTH/2) {

                memmove(dsc->data, dsc->data + dsc->data_index,

                    dsc->data_length - dsc->data_index);

                dsc->data_offset += dsc->data_index;

                dsc->data_length -= dsc->data_index;

                dsc->data_index = 0;

            }

            /* append to buffer */

            bytes_read = min(length, (int)(CDSC_DATA_LENGTH - dsc->data_length));

            memcpy(dsc->data + dsc->data_length, data, bytes_read);

            dsc->data_length += bytes_read;

            data += bytes_read;

            length -= bytes_read;

        }

        if (dsc->scan_section == scan_none) {

            code = dsc_scan_type(dsc);

            if (code == CDSC_NEEDMORE) {

                /* need more characters before we can identify type */

                code = CDSC_OK;

                break;

            }

            dsc->id = code;

        }

        if (code == CDSC_NOTDSC) {

            dsc->id = CDSC_NOTDSC;

            break;

        }

        while ((code = dsc_read_line(dsc)) > 0) {

            if (dsc->id == CDSC_NOTDSC)

                break;

            if (dsc->file_length &&

                (dsc->data_offset + dsc->data_index > dsc->file_length)) {

                /* have read past end of where we need to parse. */

                return CDSC_OK; /* ignore */

            }

            if (dsc->doseps_end &&

                (dsc->data_offset + dsc->data_index > dsc->doseps_end)) {

                /* have read past end of DOS EPS or Mac Binary

                 * PostScript section

                 */

                return CDSC_OK; /* ignore */

            }

            if (dsc->eof)

                return CDSC_OK;

            if (dsc->skip_document)

                continue;  /* embedded document */

            if (dsc->skip_lines)

                continue; /* embedded lines */

            if (IS_DSC(dsc->line, "%%BeginData:"))

                continue;

            if (IS_DSC(dsc->line, "%%BeginBinary:"))

                continue;

            if (IS_DSC(dsc->line, "%%EndDocument"))

                continue;

            if (IS_DSC(dsc->line, "%%EndData"))

                continue;

            if (IS_DSC(dsc->line, "%%EndBinary"))

                continue;

            do {

                switch (dsc->scan_section) {

                    case scan_comments:

                        code = dsc_scan_comments(dsc);

                        break;

                    case scan_pre_preview:

                    case scan_preview:

                        code = dsc_scan_preview(dsc);

                        break;

                    case scan_pre_defaults:

                    case scan_defaults:

                        code = dsc_scan_defaults(dsc);

                        break;

                    case scan_pre_prolog:

                    case scan_prolog:

                        code = dsc_scan_prolog(dsc);

                        break;

                    case scan_pre_setup:

                    case scan_setup:

                        code = dsc_scan_setup(dsc);

                        break;

                    case scan_pre_pages:

                    case scan_pages:

                        code = dsc_scan_page(dsc);

                        break;

                    case scan_pre_trailer:

                    case scan_trailer:

                        code = dsc_scan_trailer(dsc);

                        break;

                    case scan_eof:

                        code = CDSC_OK;

                        break;

                    default:

                        /* invalid state */

                        code = CDSC_ERROR;

                }

                /* repeat if line is start of next section */

            } while (code == CDSC_PROPAGATE);

            /* if DOS EPS header not complete, ask for more */

            if (code == CDSC_NEEDMORE) {

                code = CDSC_OK;

                break;

            }

            if (code == CDSC_NOTDSC) {

                dsc->id = CDSC_NOTDSC;

                break;

            }

        }

    } while (length != 0);

    return (code < 0) ? code : dsc->id;

}

/* Tidy up from incorrect DSC comments */

int

dsc_fixup(CDSC *dsc)

{

    unsigned int i;

    char buf[32];

    DSC_OFFSET *last;

    if (dsc->id == CDSC_NOTDSC)

        return 0;

    /* flush last partial line */

    dsc_scan_data(dsc, NULL, 0);

    /* Fix DSC error: EOF before end of %%BeginData */

    if (dsc->eof &&

        (dsc->skip_lines || dsc->skip_bytes || dsc->skip_document)) {

        switch (dsc->scan_section) {

            case scan_comments:

                dsc->endcomments = DSC_END(dsc);

                break;

            case scan_preview:

                dsc->endpreview = DSC_END(dsc);

                break;

            case scan_defaults:

                dsc->enddefaults = DSC_END(dsc);

                break;

            case scan_prolog:

                dsc->endprolog = DSC_END(dsc);

                break;

            case scan_setup:

                dsc->endsetup = DSC_END(dsc);

                break;

            case scan_pages:

                if (dsc->page_count)

                    dsc->page[dsc->page_count-1].end = DSC_END(dsc);

                break;

            case scan_trailer:

            case scan_eof:

                dsc->endtrailer = DSC_END(dsc);

                break;

        }

    }

    /* Fix DSC error: code between %%EndSetup and %%Page */

    if (dsc->page_count && (dsc->page[0].begin != dsc->endsetup)

                && (dsc->endsetup != dsc->beginsetup)) {

        dsc->endsetup = dsc->page[0].begin;

        dsc_debug_print(dsc, "Warning: code included between setup and first page\n");

    }

    /* Last page contained a false trailer, */

    /* so extend last page to start of trailer */

    if (dsc->page_count && (dsc->begintrailer != 0) &&

        (dsc->page[dsc->page_count-1].end != dsc->begintrailer)) {

        dsc_debug_print(dsc, "Ignoring earlier misplaced trailer\n");

        dsc_debug_print(dsc, "and extending last page to start of trailer\n");

        dsc->page[dsc->page_count-1].end = dsc->begintrailer;

    }

    /*

     * Join up all sections.

     * There might be extra code between them, or we might have

     * missed including the \n which followed \r.

     */

    last = &dsc->endcomments;

    dsc_section_join(dsc->beginpreview, &dsc->endpreview, &last);

    dsc_section_join(dsc->begindefaults, &dsc->enddefaults, &last);

    dsc_section_join(dsc->beginprolog, &dsc->endprolog, &last);

    dsc_section_join(dsc->beginsetup, &dsc->endsetup, &last);

    for (i=0; i<dsc->page_count; i++)

        dsc_section_join(dsc->page[i].begin, &dsc->page[i].end, &last);

    if (dsc->begintrailer)

        *last = dsc->begintrailer;

    if ((dsc->page_pages == 0) && (dsc->page_count == 1)) {

        /* don't flag an error if %%Pages absent but one %%Page found */

        /* adjust incorrect page count */

        dsc->page_pages = dsc->page_count;

    }

    /* Warnings and Errors that we can now identify */

    if ((dsc->page_count != dsc->page_pages)) {

        int rc = dsc_error(dsc, CDSC_MESSAGE_PAGES_WRONG, NULL, 0);

        switch (rc) {

            case CDSC_RESPONSE_OK:

                /* adjust incorrect page count */

                dsc->page_pages = dsc->page_count;

                break;

            case CDSC_RESPONSE_CANCEL:

                break;;

            case CDSC_RESPONSE_IGNORE_ALL:

                return CDSC_NOTDSC;

        }

    }

    if (dsc->epsf && (dsc->bbox == (CDSCBBOX *)NULL)) {

        /* EPS files MUST include a BoundingBox */

        int rc = dsc_error(dsc, CDSC_MESSAGE_EPS_NO_BBOX, NULL, 0);

        switch (rc) {

            case CDSC_RESPONSE_OK:

                /* Assume that it is EPS */

                break;

            case CDSC_RESPONSE_CANCEL:

                /* Is NOT an EPS file */

                dsc->epsf = FALSE;

            case CDSC_RESPONSE_IGNORE_ALL:

                return CDSC_NOTDSC;

        }

    }

    if (dsc->epsf && ((dsc->page_count > 1) || (dsc->page_pages > 1))) {

        int rc = dsc_error(dsc, CDSC_MESSAGE_EPS_PAGES, NULL, 0);

        switch (rc) {

            case CDSC_RESPONSE_OK:

                /* Is an EPS file */

                break;

            case CDSC_RESPONSE_CANCEL:

                /* Is NOT an EPS file */

                dsc->epsf = FALSE;

                break;

            case CDSC_RESPONSE_IGNORE_ALL:

                return CDSC_NOTDSC;

        }

    }

    /* convert single file DSC 2.0 into multiple pages */

    dsc_dcs2_fixup(dsc);

    if ((dsc->media_count == 1) && (dsc->page_media == NULL)) {

        /* if one only media was specified, and default page media */

        /* was not specified, assume that default is the only media. */

        dsc->page_media = dsc->media[0];

    }

    if ((dsc->media_count != 0) && (dsc->page_media == NULL)) {

        int rc = dsc_error(dsc, CDSC_MESSAGE_NO_MEDIA, NULL, 0);

        switch (rc) {

            case CDSC_RESPONSE_OK:

                /* default media is first listed */

                dsc->page_media = dsc->media[0];

                break;

            case CDSC_RESPONSE_CANCEL:

                /* No default media */

                break;

            case CDSC_RESPONSE_IGNORE_ALL:

                return CDSC_NOTDSC;

        }

    }

    /* make sure all pages have a label */

    for (i=0; i<dsc->page_count; i++) {

        if (strlen(dsc->page[i].label) == 0) {

            gs_snprintf(buf, sizeof(buf), "%d", i+1);

            if ((dsc->page[i].label = dsc_alloc_string(dsc, buf, (int)strlen(buf)))

                == (char *)NULL)

                return CDSC_ERROR; /* no memory */

        }

    }

    return CDSC_OK;

}

/* Install a function to be used for displaying messages about

 * DSC errors and warnings, and to request advice from user.

 * Installing an error function is optional.

 */

void

dsc_set_error_function(CDSC *dsc,

        int (*fn)(void *caller_data, CDSC *dsc,

        unsigned int explanation, const char *line, unsigned int line_len))

{

    dsc->dsc_error_fn = fn;

}

/* Install a function for printing debug messages */

/* This is optional */

void

dsc_set_debug_function(CDSC *dsc,

        void (*debug_fn)(void *caller_data, const char *str))

{

    dsc->debug_print_fn = debug_fn;

}

/* Doesn't need to be public for PostScript documents */

/* Made public so GSview can add pages when processing PDF files */

int

dsc_add_page(CDSC *dsc, int ordinal, char *label)

{

    dsc->page[dsc->page_count].ordinal = ordinal;

    dsc->page[dsc->page_count].label =

        dsc_alloc_string(dsc, label, (int)strlen(label)+1);

    if (dsc->page[dsc->page_count].label == NULL)

        return CDSC_ERROR; /* out of memory */

    dsc->page[dsc->page_count].begin = 0;

    dsc->page[dsc->page_count].end = 0;

    dsc->page[dsc->page_count].orientation = CDSC_ORIENT_UNKNOWN;

    dsc->page[dsc->page_count].media = NULL;

    dsc->page[dsc->page_count].bbox = NULL;

    dsc->page[dsc->page_count].viewing_orientation = NULL;

    dsc->page[dsc->page_count].crop_box = NULL;

    dsc->page_count++;

    if (dsc->page_count >= dsc->page_chunk_length) {

        CDSCPAGE *new_page = (CDSCPAGE *)dsc_memalloc(dsc,

            (CDSC_PAGE_CHUNK+dsc->page_count) * sizeof(CDSCPAGE));

        if (new_page == NULL)

            return CDSC_ERROR; /* out of memory */

        memcpy(new_page, dsc->page,

            dsc->page_count * sizeof(CDSCPAGE));

        dsc_memfree(dsc, dsc->page);

        dsc->page= new_page;

        dsc->page_chunk_length = CDSC_PAGE_CHUNK+dsc->page_count;

    }

    return CDSC_OK;

}

/* Doesn't need to be public for PostScript documents */

/* Made public so GSview can store PDF MediaBox */

int

dsc_add_media(CDSC *dsc, CDSCMEDIA *media)

{

    CDSCMEDIA **newmedia_array;

    CDSCMEDIA *newmedia;

    /* extend media array  */

    newmedia_array = (CDSCMEDIA **)dsc_memalloc(dsc,

        (dsc->media_count + 1) * sizeof(CDSCMEDIA *));

    if (newmedia_array == NULL)

        return CDSC_ERROR; /* out of memory */

    if (dsc->media != NULL) {

        memcpy(newmedia_array, dsc->media,

            dsc->media_count * sizeof(CDSCMEDIA *));

        dsc_memfree(dsc, dsc->media);

    }

    dsc->media = newmedia_array;

    /* allocate new media */

    newmedia = dsc->media[dsc->media_count] =

        (CDSCMEDIA *)dsc_memalloc(dsc, sizeof(CDSCMEDIA));

    if (newmedia == NULL)

        return CDSC_ERROR; /* out of memory */

    newmedia->name = NULL;

    newmedia->width = 595.0;

    newmedia->height = 842.0;

    newmedia->weight = 80.0;

    newmedia->colour = NULL;

    newmedia->type = NULL;

    newmedia->mediabox = NULL;

    dsc->media_count++;

    if (media->name) {

        newmedia->name = dsc_alloc_string(dsc, media->name,

            (int)strlen(media->name));

        if (newmedia->name == NULL)

            return CDSC_ERROR; /* no memory */

    }

    newmedia->width = media->width;

    newmedia->height = media->height;

    newmedia->weight = media->weight;

    if (media->colour) {

        newmedia->colour = dsc_alloc_string(dsc, media->colour,

            (int)strlen(media->colour));

        if (newmedia->colour == NULL)

            return CDSC_ERROR; /* no memory */

    }

    if (media->type) {

        newmedia->type = dsc_alloc_string(dsc, media->type,

            (int)strlen(media->type));

        if (newmedia->type == NULL)

            return CDSC_ERROR; /* no memory */

    }

    newmedia->mediabox = NULL;

    if (media->mediabox) {

        newmedia->mediabox = (CDSCBBOX *)dsc_memalloc(dsc, sizeof(CDSCBBOX));

        if (newmedia->mediabox == NULL)

            return CDSC_ERROR; /* no memory */

        *newmedia->mediabox = *media->mediabox;

    }

    return CDSC_OK;

}

/* Doesn't need to be public for PostScript documents */

/* Made public so GSview can store PDF CropBox */

int

dsc_set_page_bbox(CDSC *dsc, unsigned int page_number,

    int llx, int lly, int urx, int ury)

{

    CDSCBBOX *bbox;

    if (page_number >= dsc->page_count)

        return CDSC_ERROR;

    bbox = dsc->page[page_number].bbox;

    if (bbox == NULL)

        dsc->page[page_number].bbox = bbox =

            (CDSCBBOX *)dsc_memalloc(dsc, sizeof(CDSCBBOX));

    if (bbox == NULL)

        return CDSC_ERROR;

    bbox->llx = llx;

    bbox->lly = lly;

    bbox->urx = urx;

    bbox->ury = ury;

    return CDSC_OK;

}

/******************************************************************/

/* Private functions below here.                                  */

/******************************************************************/

static void *

dsc_memalloc(CDSC *dsc, size_t size)

{

    if (dsc->memalloc)

        return dsc->memalloc(size, dsc->mem_closure_data);

    return malloc(size);

}

static void

dsc_memfree(CDSC*dsc, void *ptr)

{

    if (dsc->memfree)

        dsc->memfree(ptr, dsc->mem_closure_data);

    else

        free(ptr);

}

/* private constructor */

static CDSC *

dsc_init2(CDSC *dsc)

{

    dsc_reset(dsc);

    dsc->string_head = (CDSCSTRING *)dsc_memalloc(dsc, sizeof(CDSCSTRING));

    if (dsc->string_head == NULL) {

        dsc_free(dsc);

        return NULL;  /* no memory */

    }

    dsc->string = dsc->string_head;

    dsc->string->next = NULL;

    dsc->string->data = (char *)dsc_memalloc(dsc, CDSC_STRING_CHUNK);

    if (dsc->string->data == NULL) {

        dsc_free(dsc);

        return NULL;  /* no memory */

    }

    dsc->string->index = 0;

    dsc->string->length = CDSC_STRING_CHUNK;

    dsc->page = (CDSCPAGE *)dsc_memalloc(dsc, CDSC_PAGE_CHUNK * sizeof(CDSCPAGE));

    if (dsc->page == NULL) {

        dsc_free(dsc);

        return NULL;  /* no memory */

    }

    dsc->page_chunk_length = CDSC_PAGE_CHUNK;

    dsc->page_count = 0;

    dsc->line = NULL;

    dsc->data_length = 0;

    dsc->data_index = dsc->data_length;

    return dsc;

}

static void

dsc_reset(CDSC *dsc)

{

    unsigned int i;

    /* Clear public members */

    dsc->dsc = FALSE;

    dsc->ctrld = FALSE;

    dsc->pjl = FALSE;

    dsc->epsf = FALSE;

    dsc->pdf = FALSE;

    dsc->epsf = FALSE;

    dsc->preview = CDSC_NOPREVIEW;

    dsc->dsc_version = NULL;  /* stored in dsc->string */

    dsc->language_level = 0;

    dsc->document_data = CDSC_DATA_UNKNOWN;

    dsc->begincomments = 0;

    dsc->endcomments = 0;

    dsc->beginpreview = 0;

    dsc->endpreview = 0;

    dsc->begindefaults = 0;

    dsc->enddefaults = 0;

    dsc->beginprolog = 0;

    dsc->endprolog = 0;

    dsc->beginsetup = 0;

    dsc->endsetup = 0;

    dsc->begintrailer = 0;

    dsc->endtrailer = 0;

    for (i=0; i<dsc->page_count; i++) {

        /* page media is pointer to an element of media or dsc_known_media */

        /* do not free it. */

        if (dsc->page[i].bbox)

            dsc_memfree(dsc, dsc->page[i].bbox);

        if (dsc->page[i].viewing_orientation)

            dsc_memfree(dsc, dsc->page[i].viewing_orientation);

        if (dsc->page[i].crop_box)

            dsc_memfree(dsc, dsc->page[i].crop_box);

    }

    if (dsc->page)

        dsc_memfree(dsc, dsc->page);

    dsc->page = NULL;

    dsc->page_count = 0;

    dsc->page_pages = 0;

    dsc->page_order = CDSC_ORDER_UNKNOWN;

    dsc->page_orientation = CDSC_ORIENT_UNKNOWN;

    if (dsc->viewing_orientation)

        dsc_memfree(dsc, dsc->viewing_orientation);

    dsc->viewing_orientation = NULL;

    if (dsc->media) {

        for (i=0; i<dsc->media_count; i++) {

            if (dsc->media[i]) {

                if (dsc->media[i]->mediabox)

                    dsc_memfree(dsc, dsc->media[i]->mediabox);

                dsc_memfree(dsc, dsc->media[i]);

            }

        }

        dsc_memfree(dsc, dsc->media);

    }

    dsc->media_count = 0;

    dsc->media = NULL;

    /* page_media is pointer to an element of media or dsc_known_media */

    /* do not free it. */

    dsc->page_media = NULL;

    if (dsc->bbox)

        dsc_memfree(dsc, dsc->bbox);

    dsc->bbox = NULL;

    if (dsc->page_bbox)

        dsc_memfree(dsc, dsc->page_bbox);

    dsc->page_bbox = NULL;

    if (dsc->doseps)

        dsc_memfree(dsc, dsc->doseps);

    dsc->doseps = NULL;

    dsc->dsc_title = NULL;

    dsc->dsc_creator = NULL;

    dsc->dsc_date = NULL;

    dsc->dsc_for = NULL;

    dsc->max_error = DSC_MAX_ERROR;

    dsc->severity = dsc_severity;

    /* Clear private members */

    /* Don't touch dsc->caller_data */

    dsc->id = CDSC_OK;

    dsc->scan_section = scan_none;

    dsc->doseps_end = 0;

    dsc->page_chunk_length = 0;

    dsc->file_length = 0;

    dsc->skip_document = 0;

    dsc->skip_bytes = 0;

    dsc->skip_lines = 0;

    dsc->skip_pjl = 0;

    dsc->begin_font_count = 0;

    dsc->begin_feature_count = 0;

    dsc->begin_resource_count = 0;

    dsc->begin_procset_count = 0;

    dsc->data_length = 0;

    dsc->data_index = 0;

    dsc->data_offset = 0;

    dsc->eof = 0;

    dsc->line = 0;

    dsc->line_length = 0;

    dsc->eol = 0;

    dsc->last_cr = FALSE;

    dsc->line_count = 1;

    dsc->long_line = FALSE;

    memset(dsc->last_line, 0, sizeof(dsc->last_line));

    dsc->string = dsc->string_head;

    while (dsc->string != (CDSCSTRING *)NULL) {

        if (dsc->string->data)

            dsc_memfree(dsc, dsc->string->data);

        dsc->string_head = dsc->string;

        dsc->string = dsc->string->next;

        dsc_memfree(dsc, dsc->string_head);

    }

    dsc->string_head = NULL;

    dsc->string = NULL;

    /* don't touch caller functions */

    /* public data */

    if (dsc->hires_bbox)

        dsc_memfree(dsc, dsc->hires_bbox);

    dsc->hires_bbox = NULL;

    if (dsc->crop_box)

        dsc_memfree(dsc, dsc->crop_box);

    dsc->crop_box = NULL;

    if (dsc->dcs2) {

        CDCS2 *this_dcs, *next_dcs;

        this_dcs = dsc->dcs2;

        while (this_dcs) {

            next_dcs = this_dcs->next;

            /* strings have already been freed */

            dsc_memfree(dsc, this_dcs);

            this_dcs = next_dcs;

        }

        dsc->dcs2 = NULL;

    }

    if (dsc->colours) {

        CDSCCOLOUR *this_colour, *next_colour;

        this_colour = dsc->colours;

        while (this_colour) {

            next_colour = this_colour->next;

            /* strings have already been freed */

            dsc_memfree(dsc, this_colour);

            this_colour = next_colour;

        }

        dsc->colours = NULL;

    }

    if (dsc->macbin)

        dsc_memfree(dsc, dsc->macbin);

    dsc->macbin = NULL;

}

/*

* Join up all sections.

* There might be extra code between them, or we might have

* missed including the \n which followed \r.

* begin is the start of this section

* pend is a pointer to the end of this section

* pplast is a pointer to a pointer of the end of the previous section

*/

static void

dsc_section_join(DSC_OFFSET begin, DSC_OFFSET *pend, DSC_OFFSET **pplast)

{

    if (begin)

        **pplast = begin;