/src/CMake/Utilities/cmlibarchive/libarchive/archive_write.c

Source
/*-
 * Copyright (c) 2003-2010 Tim Kientzle
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "archive_platform.h"

/*
 * This file contains the "essential" portions of the write API, that
 * is, stuff that will essentially always be used by any client that
 * actually needs to write an archive.  Optional pieces have been, as
 * far as possible, separated out into separate files to reduce
 * needlessly bloating statically-linked clients.
 */

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_private.h"

static int  _archive_filter_code(struct archive *, int);
static const char *_archive_filter_name(struct archive *, int);
static int64_t  _archive_filter_bytes(struct archive *, int);
static int  _archive_write_filter_count(struct archive *);
static int  _archive_write_close(struct archive *);
static int  _archive_write_free(struct archive *);
static int  _archive_write_header(struct archive *, struct archive_entry *);
static int  _archive_write_finish_entry(struct archive *);
static ssize_t  _archive_write_data(struct archive *, const void *, size_t);

struct client {
  size_t buffer_size;
  size_t avail;
  char *buffer;
  char *next;
};

static const struct archive_vtable
archive_write_vtable = {
  .archive_close = _archive_write_close,
  .archive_filter_bytes = _archive_filter_bytes,
  .archive_filter_code = _archive_filter_code,
  .archive_filter_name = _archive_filter_name,
  .archive_filter_count = _archive_write_filter_count,
  .archive_free = _archive_write_free,
  .archive_write_header = _archive_write_header,
  .archive_write_finish_entry = _archive_write_finish_entry,
  .archive_write_data = _archive_write_data,
};

/*
 * Allocate, initialize and return an archive object.
 */
struct archive *
archive_write_new(void)
{
  struct archive_write *a;
  unsigned char *nulls;

  a = calloc(1, sizeof(*a));
  if (a == NULL)
    return (NULL);
  a->archive.magic = ARCHIVE_WRITE_MAGIC;
  a->archive.state = ARCHIVE_STATE_NEW;
  a->archive.vtable = &archive_write_vtable;
  /*
   * The value 10240 here matches the traditional tar default,
   * but is otherwise arbitrary.
   * TODO: Set the default block size from the format selected.
   */
  a->bytes_per_block = 10240;
  a->bytes_in_last_block = -1;  /* Default */

  /* Initialize a block of nulls for padding purposes. */
  a->null_length = 1024;
  nulls = calloc(a->null_length, sizeof(unsigned char));
  if (nulls == NULL) {
    free(a);
    return (NULL);
  }
  a->nulls = nulls;
  return (&a->archive);
}

/*
 * Set the block size.  Returns 0 if successful.
 */
int
archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
{
  struct archive_write *a = (struct archive_write *)_a;
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");

  if (bytes_per_block < 0) {
    // Do nothing if the bytes_per_block is negative
    return ARCHIVE_OK;
  }
  a->bytes_per_block = bytes_per_block;
  return (ARCHIVE_OK);
}

/*
 * Get the current block size.
 */
int
archive_write_get_bytes_per_block(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
  if (a->bytes_per_block < 0) {
    // Don't return a negative value
    return 1;
  }
  return (a->bytes_per_block);
}

/*
 * Set the size for the last block.
 * Returns 0 if successful.
 */
int
archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
{
  struct archive_write *a = (struct archive_write *)_a;
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
  a->bytes_in_last_block = bytes;
  return (ARCHIVE_OK);
}

/*
 * Return the value set above.  -1 indicates it has not been set.
 */
int
archive_write_get_bytes_in_last_block(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
  return (a->bytes_in_last_block);
}

/*
 * dev/ino of a file to be rejected.  Used to prevent adding
 * an archive to itself recursively.
 */
int
archive_write_set_skip_file(struct archive *_a, la_int64_t d, la_int64_t i)
{
  struct archive_write *a = (struct archive_write *)_a;
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
  a->skip_file_set = 1;
  a->skip_file_dev = d;
  a->skip_file_ino = i;
  return (ARCHIVE_OK);
}

/*
 * Allocate and return the next filter structure.
 */
struct archive_write_filter *
__archive_write_allocate_filter(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  struct archive_write_filter *f;

  f = calloc(1, sizeof(*f));

  if (f == NULL)
    return (NULL);

  f->archive = _a;
  f->state = ARCHIVE_WRITE_FILTER_STATE_NEW;
  if (a->filter_first == NULL)
    a->filter_first = f;
  else
    a->filter_last->next_filter = f;
  a->filter_last = f;
  return f;
}

/*
 * Write data to a particular filter.
 */
int
__archive_write_filter(struct archive_write_filter *f,
    const void *buff, size_t length)
{
  int r;
  /* Never write to non-open filters */
  if (f->state != ARCHIVE_WRITE_FILTER_STATE_OPEN)
    return(ARCHIVE_FATAL);
  if (length == 0)
    return(ARCHIVE_OK);
  if (f->write == NULL)
    /* If unset, a fatal error has already occurred, so this filter
     * didn't open. We cannot write anything. */
    return(ARCHIVE_FATAL);
  if (length > (uint64_t)(INT64_MAX - f->bytes_written))
    return(ARCHIVE_FATAL);
  r = (f->write)(f, buff, length);
  f->bytes_written += (int64_t)length;
  return (r);
}

/*
 * Recursive function for opening the filter chain
 * Last filter is opened first
 */
static int
__archive_write_open_filter(struct archive_write_filter *f)
{
  int ret;

  ret = ARCHIVE_OK;
  if (f->next_filter != NULL)
    ret = __archive_write_open_filter(f->next_filter);
  if (ret != ARCHIVE_OK)
    return (ret);
  if (f->state != ARCHIVE_WRITE_FILTER_STATE_NEW)
    return (ARCHIVE_FATAL);
  if (f->open == NULL) {
    f->state = ARCHIVE_WRITE_FILTER_STATE_OPEN;
    return (ARCHIVE_OK);
  }
  ret = (f->open)(f);
  if (ret == ARCHIVE_OK)
    f->state = ARCHIVE_WRITE_FILTER_STATE_OPEN;
  else
    f->state = ARCHIVE_WRITE_FILTER_STATE_FATAL;
  return (ret);
}

/*
 * Open all filters
 */
static int
__archive_write_filters_open(struct archive_write *a)
{
  return (__archive_write_open_filter(a->filter_first));
}

/*
 * Close all filters
 */
static int
__archive_write_filters_close(struct archive_write *a)
{
  struct archive_write_filter *f;
  int ret, ret1;
  ret = ARCHIVE_OK;
  for (f = a->filter_first; f != NULL; f = f->next_filter) {
    /* Do not close filters that are not open */
    if (f->state == ARCHIVE_WRITE_FILTER_STATE_OPEN) {
      if (f->close != NULL) {
        ret1 = (f->close)(f);
        if (ret1 < ret)
          ret = ret1;
        if (ret1 == ARCHIVE_OK) {
          f->state =
              ARCHIVE_WRITE_FILTER_STATE_CLOSED;
        } else {
          f->state =
              ARCHIVE_WRITE_FILTER_STATE_FATAL;
        }
      } else
        f->state = ARCHIVE_WRITE_FILTER_STATE_CLOSED;
    }
  }
  return (ret);
}

int
__archive_write_output(struct archive_write *a, const void *buff, size_t length)
{
  return (__archive_write_filter(a->filter_first, buff, length));
}

static int
__archive_write_filters_flush(struct archive_write *a)
{
  struct archive_write_filter *f;
  int ret, ret1;

  ret = ARCHIVE_OK;
  for (f = a->filter_first; f != NULL; f = f->next_filter) {
    if (f->flush != NULL && f->bytes_written > 0) {
      ret1 = (f->flush)(f);
      if (ret1 < ret)
        ret = ret1;
      if (ret1 < ARCHIVE_WARN)
        f->state = ARCHIVE_WRITE_FILTER_STATE_FATAL;
    }
  }
  return (ret);
}

int
__archive_write_nulls(struct archive_write *a, uint64_t length)
{
  if (length == 0)
    return (ARCHIVE_OK);

  while (length > 0) {
    size_t to_write = length < a->null_length ? length : a->null_length;
    int r = __archive_write_output(a, a->nulls, to_write);
    if (r < ARCHIVE_OK)
      return (r);
    length -= to_write;
  }
  return (ARCHIVE_OK);
}

static int
archive_write_client_open(struct archive_write_filter *f)
{
  struct archive_write *a = (struct archive_write *)f->archive;
  struct client *client;
  void *buffer;
  size_t buffer_size;

  f->bytes_per_block = archive_write_get_bytes_per_block(f->archive);
  f->bytes_in_last_block =
      archive_write_get_bytes_in_last_block(f->archive);
  buffer_size = f->bytes_per_block;

  client = calloc(1, sizeof(*client));
  buffer = malloc(buffer_size);
  if (client == NULL || buffer == NULL) {
    free(client);
    free(buffer);
    archive_set_error(f->archive, ENOMEM,
        "Can't allocate data for output buffering");
    return (ARCHIVE_FATAL);
  }

  client->buffer_size = buffer_size;
  client->buffer = buffer;
  client->next = client->buffer;
  client->avail = client->buffer_size;
  f->data = client;

  if (a->client_opener == NULL)
    return (ARCHIVE_OK);
  return (a->client_opener(f->archive, a->client_data));
}

static int
archive_write_client_write(struct archive_write_filter *f,
    const void *_buff, size_t length)
{
  struct archive_write *a = (struct archive_write *)f->archive;
  struct client *client = f->data;
  const char *buff = (const char *)_buff;
  ssize_t remaining, to_copy;
  ssize_t bytes_written;

  remaining = length;

  /*
   * If there is no buffer for blocking, just pass the data
   * straight through to the client write callback.  In
   * particular, this supports "no write delay" operation for
   * special applications.  Just set the block size to zero.
   */
  if (client->buffer_size == 0) {
    while (remaining > 0) {
      bytes_written = (a->client_writer)(&a->archive,
          a->client_data, buff, remaining);
      if (bytes_written <= 0)
        return (ARCHIVE_FATAL);
      remaining -= bytes_written;
      buff += bytes_written;
    }
    return (ARCHIVE_OK);
  }

  /* If the copy buffer isn't empty, try to fill it. */
  if (client->avail < client->buffer_size) {
    /* If buffer is not empty... */
    /* ... copy data into buffer ... */
    to_copy = ((size_t)remaining > client->avail) ?
      client->avail : (size_t)remaining;
    memcpy(client->next, buff, to_copy);
    client->next += to_copy;
    client->avail -= to_copy;
    buff += to_copy;
    remaining -= to_copy;
    /* ... if it's full, write it out. */
    if (client->avail == 0) {
      char *p = client->buffer;
      size_t to_write = client->buffer_size;
      while (to_write > 0) {
        bytes_written = (a->client_writer)(&a->archive,
            a->client_data, p, to_write);
        if (bytes_written <= 0)
          return (ARCHIVE_FATAL);
        if ((size_t)bytes_written > to_write) {
          archive_set_error(&(a->archive),
              -1, "write overrun");
          return (ARCHIVE_FATAL);
        }
        p += bytes_written;
        to_write -= bytes_written;
      }
      client->next = client->buffer;
      client->avail = client->buffer_size;
    }
  }

  while ((size_t)remaining >= client->buffer_size) {
    /* Write out full blocks directly to client. */
    bytes_written = (a->client_writer)(&a->archive,
        a->client_data, buff, client->buffer_size);
    if (bytes_written <= 0)
      return (ARCHIVE_FATAL);
    buff += bytes_written;
    remaining -= bytes_written;
  }

  if (remaining > 0) {
    /* Copy last bit into copy buffer. */
    memcpy(client->next, buff, remaining);
    client->next += remaining;
    client->avail -= remaining;
  }
  return (ARCHIVE_OK);
}

static int
archive_write_client_free(struct archive_write_filter *f)
{
  struct archive_write *a = (struct archive_write *)f->archive;
  struct client *client = f->data;

  if (a->client_freer)
    (*a->client_freer)(&a->archive, a->client_data);
  a->client_data = NULL;

  /* Clear passphrase. */
  if (a->passphrase != NULL) {
    memset(a->passphrase, 0, strlen(a->passphrase));
    free(a->passphrase);
    a->passphrase = NULL;
  }

  /* Free state. */
  if (client != NULL) {
    free(client->buffer);
    free(client);
    f->data = NULL;
  }

  return (ARCHIVE_OK);
}

static int
archive_write_client_close(struct archive_write_filter *f)
{
  struct archive_write *a = (struct archive_write *)f->archive;
  struct client *client = f->data;
  ssize_t block_length;
  ssize_t target_block_length;
  ssize_t bytes_written;
  size_t to_write;
  char *p;
  int ret = ARCHIVE_OK;

  /* If there's pending data, pad and write the last block */
  if (client->next != client->buffer) {
    block_length = client->buffer_size - client->avail;

    /* Tricky calculation to determine size of last block */
    if (a->bytes_in_last_block <= 0)
      /* Default or Zero: pad to full block */
      target_block_length = a->bytes_per_block;
    else
      /* Round to next multiple of bytes_in_last_block. */
      target_block_length = a->bytes_in_last_block *
          ( (block_length + a->bytes_in_last_block - 1) /
              a->bytes_in_last_block);
    if (target_block_length > a->bytes_per_block)
      target_block_length = a->bytes_per_block;
    if (block_length < target_block_length) {
      memset(client->next, 0,
          target_block_length - block_length);
      block_length = target_block_length;
    }
    p = client->buffer;
    to_write = block_length;
    while (to_write > 0) {
      bytes_written = (a->client_writer)(&a->archive,
          a->client_data, p, to_write);
      if (bytes_written <= 0) {
        ret = ARCHIVE_FATAL;
        break;
      }
      if ((size_t)bytes_written > to_write) {
        archive_set_error(&(a->archive),
              -1, "write overrun");
        ret = ARCHIVE_FATAL;
        break;
      }
      p += bytes_written;
      to_write -= bytes_written;
    }
  }
  if (a->client_closer)
    (*a->client_closer)(&a->archive, a->client_data);

  /* Clear the close handler myself not to be called again. */
  f->state = ARCHIVE_WRITE_FILTER_STATE_CLOSED;
  return (ret);
}

/*
 * Open the archive using the current settings.
 */
int
archive_write_open2(struct archive *_a, void *client_data,
    archive_open_callback *opener, archive_write_callback *writer,
    archive_close_callback *closer, archive_free_callback *freer)
{
  struct archive_write *a = (struct archive_write *)_a;
  struct archive_write_filter *client_filter;
  int ret, r1;

  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_NEW, "archive_write_open");
  archive_clear_error(&a->archive);

  a->client_writer = writer;
  a->client_opener = opener;
  a->client_closer = closer;
  a->client_freer = freer;
  a->client_data = client_data;

  client_filter = __archive_write_allocate_filter(_a);

  if (client_filter == NULL)
    return (ARCHIVE_FATAL);

  client_filter->open = archive_write_client_open;
  client_filter->write = archive_write_client_write;
  client_filter->close = archive_write_client_close;
  client_filter->free = archive_write_client_free;

  ret = __archive_write_filters_open(a);
  if (ret < ARCHIVE_WARN) {
    r1 = __archive_write_filters_close(a);
    __archive_write_filters_free(_a);
    return (r1 < ret ? r1 : ret);
  }

  a->archive.state = ARCHIVE_STATE_HEADER;
  if (a->format_init)
    ret = (a->format_init)(a);
  return (ret);
}

int
archive_write_open(struct archive *_a, void *client_data,
    archive_open_callback *opener, archive_write_callback *writer,
    archive_close_callback *closer)
{
  return archive_write_open2(_a, client_data, opener, writer,
      closer, NULL);
}

/*
 * Close out the archive.
 */
static int
_archive_write_close(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  int r = ARCHIVE_OK, r1 = ARCHIVE_OK;

  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL,
      "archive_write_close");
  if (a->archive.state == ARCHIVE_STATE_NEW
      || a->archive.state == ARCHIVE_STATE_CLOSED)
    return (ARCHIVE_OK); /* Okay to close() when not open. */

  archive_clear_error(&a->archive);

  /* Finish the last entry if a finish callback is specified */
  if (a->archive.state == ARCHIVE_STATE_DATA
      && a->format_finish_entry != NULL)
    r = ((a->format_finish_entry)(a));

  /* Finish off the archive. */
  /* TODO: have format closers invoke compression close. */
  if (a->format_close != NULL) {
    r1 = (a->format_close)(a);
    if (r1 < r)
      r = r1;
  }

  /* Finish the compression and close the stream. */
  r1 = __archive_write_filters_close(a);
  if (r1 < r)
    r = r1;

  if (a->archive.state != ARCHIVE_STATE_FATAL)
    a->archive.state = ARCHIVE_STATE_CLOSED;
  return (r);
}

static int
_archive_write_filter_count(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  struct archive_write_filter *p = a->filter_first;
  int count = 0;
  while(p) {
    count++;
    p = p->next_filter;
  }
  return count;
}

void
__archive_write_filters_free(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  int r = ARCHIVE_OK, r1;

  while (a->filter_first != NULL) {
    struct archive_write_filter *next
        = a->filter_first->next_filter;
    if (a->filter_first->free != NULL) {
      r1 = (*a->filter_first->free)(a->filter_first);
      if (r > r1)
        r = r1;
    }
    free(a->filter_first);
    a->filter_first = next;
  }
  a->filter_last = NULL;
}

int
__archive_write_unregister_format(struct archive_write *a)
{
  int r = ARCHIVE_OK;

  if (a->format_free != NULL)
    r = (a->format_free)(a);

  a->format_data = NULL;
  a->format_name = NULL;
  a->format_init = NULL;
  a->format_options = NULL;
  a->format_finish_entry = NULL;
  a->format_write_header = NULL;
  a->format_write_data = NULL;
  a->format_close = NULL;
  a->format_free = NULL;
  a->archive.archive_format = 0;
  a->archive.archive_format_name = NULL;

  return (r);
}

/*
 * Destroy the archive structure.
 *
 * Be careful: user might just call write_new and then write_free.
 * Don't assume we actually wrote anything or performed any non-trivial
 * initialization.
 */
static int
_archive_write_free(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  int r = ARCHIVE_OK, r1;

  if (_a == NULL)
    return (ARCHIVE_OK);
  /* It is okay to call free() in state FATAL. */
  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_free");
  if (a->archive.state != ARCHIVE_STATE_FATAL)
    r = archive_write_close(&a->archive);

  /* Release format resources. */
  r1 = __archive_write_unregister_format(a);
  if (r1 < r)
    r = r1;

  __archive_write_filters_free(_a);

  /* Release various dynamic buffers. */
  free((void *)(uintptr_t)(const void *)a->nulls);
  archive_string_free(&a->archive.error_string);
  if (a->passphrase != NULL) {
    /* A passphrase should be cleaned. */
    memset(a->passphrase, 0, strlen(a->passphrase));
    free(a->passphrase);
  }
  a->archive.magic = 0;
  __archive_clean(&a->archive);
  free(a);
  return (r);
}

/*
 * Write the appropriate header.
 */
static int
_archive_write_header(struct archive *_a, struct archive_entry *entry)
{
  struct archive_write *a = (struct archive_write *)_a;
  int ret, r2;

  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
  archive_clear_error(&a->archive);

  if (a->format_write_header == NULL) {
    archive_set_error(&(a->archive), -1,
        "Format must be set before you can write to an archive");
    a->archive.state = ARCHIVE_STATE_FATAL;
    return (ARCHIVE_FATAL);
  }

  /* In particular, "retry" and "fatal" get returned immediately. */
  ret = archive_write_finish_entry(&a->archive);
  if (ret == ARCHIVE_FATAL) {
    a->archive.state = ARCHIVE_STATE_FATAL;
    return (ARCHIVE_FATAL);
  }
  if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
    return (ret);

  if (a->skip_file_set &&
      archive_entry_dev_is_set(entry) &&
      archive_entry_ino_is_set(entry) &&
      archive_entry_dev(entry) == (dev_t)a->skip_file_dev &&
      archive_entry_ino64(entry) == a->skip_file_ino) {
    archive_set_error(&a->archive, EIO,
        "Can't add archive to itself");
    return (ARCHIVE_FAILED);
  }

  /* Flush filters at boundary. */
  r2 = __archive_write_filters_flush(a);
  if (r2 == ARCHIVE_FAILED) {
    return (ARCHIVE_FAILED);
  }
  if (r2 == ARCHIVE_FATAL) {
    a->archive.state = ARCHIVE_STATE_FATAL;
    return (ARCHIVE_FATAL);
  }
  if (r2 < ret)
    ret = r2;

  /* Format and write header. */
  r2 = ((a->format_write_header)(a, entry));
  if (r2 == ARCHIVE_FAILED) {
    return (ARCHIVE_FAILED);
  }
  if (r2 == ARCHIVE_FATAL) {
    a->archive.state = ARCHIVE_STATE_FATAL;
    return (ARCHIVE_FATAL);
  }
  if (r2 < ret)
    ret = r2;

  a->archive.state = ARCHIVE_STATE_DATA;
  return (ret);
}

static int
_archive_write_finish_entry(struct archive *_a)
{
  struct archive_write *a = (struct archive_write *)_a;
  int ret = ARCHIVE_OK;

  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
      "archive_write_finish_entry");
  if (a->archive.state & ARCHIVE_STATE_DATA
      && a->format_finish_entry != NULL)
    ret = (a->format_finish_entry)(a);
  if (ret == ARCHIVE_FATAL)
    a->archive.state = ARCHIVE_STATE_FATAL;
  else
    a->archive.state = ARCHIVE_STATE_HEADER;
  return (ret);
}

/*
 * Note that the compressor is responsible for blocking.
 */
static ssize_t
_archive_write_data(struct archive *_a, const void *buff, size_t s)
{
  struct archive_write *a = (struct archive_write *)_a;
  const size_t max_write = INT_MAX;
  ssize_t ret;

  archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
      ARCHIVE_STATE_DATA, "archive_write_data");
  /* In particular, this catches attempts to pass negative values. */
  if (s > max_write)
    s = max_write;
  archive_clear_error(&a->archive);
  ret = (a->format_write_data)(a, buff, s);
  if (ret == ARCHIVE_FATAL)
    a->archive.state = ARCHIVE_STATE_FATAL;
  return (ret);
}

static struct archive_write_filter *
filter_lookup(struct archive *_a, int n)
{
  struct archive_write *a = (struct archive_write *)_a;
  struct archive_write_filter *f = a->filter_first;
  if (n == -1)
    return a->filter_last;
  if (n < 0)
    return NULL;
  while (n > 0 && f != NULL) {
    f = f->next_filter;
    --n;
  }
  return f;
}

static int
_archive_filter_code(struct archive *_a, int n)
{
  struct archive_write_filter *f = filter_lookup(_a, n);
  return f == NULL ? -1 : f->code;
}

static const char *
_archive_filter_name(struct archive *_a, int n)
{
  struct archive_write_filter *f = filter_lookup(_a, n);
  return f != NULL ? f->name : NULL;
}

static int64_t
_archive_filter_bytes(struct archive *_a, int n)
{
  struct archive_write_filter *f = filter_lookup(_a, n);
  return f == NULL ? -1 : f->bytes_written;
}

Coverage Report

Created: 2026-09-14 06:43