diff options
Diffstat (limited to 'ext/zip/lib/zip_fopen_index.c')
| -rw-r--r-- | ext/zip/lib/zip_fopen_index.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/ext/zip/lib/zip_fopen_index.c b/ext/zip/lib/zip_fopen_index.c new file mode 100644 index 0000000000..5da9230b2e --- /dev/null +++ b/ext/zip/lib/zip_fopen_index.c @@ -0,0 +1,219 @@ +/* + $NiH: zip_fopen_index.c,v 1.24 2005/05/20 21:54:53 wiz Exp $ + + zip_fopen_index.c -- open file in zip archive for reading by index + Copyright (C) 1999, 2004, 2005 Dieter Baron and Thomas Klausner + + This file is part of libzip, a library to manipulate ZIP archives. + The authors can be contacted at <nih@giga.or.at> + + 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. + 3. The names of the authors may not be used to endorse or promote + products derived from this software without specific prior + written permission. + + THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 <errno.h> +#include <stdio.h> +#include <stdlib.h> + +#include "zip.h" +#include "zipint.h" + +static struct zip_file *_zip_file_new(struct zip *za); + + + +struct zip_file * +zip_fopen_index(struct zip *za, int fileno, int flags) +{ + int len, ret; + int zfflags; + struct zip_file *zf; + + if ((fileno < 0) || (fileno >= za->nentry)) { + _zip_error_set(&za->error, ZIP_ER_INVAL, 0); + return NULL; + } + + if ((flags & ZIP_FL_UNCHANGED) == 0 + && ZIP_ENTRY_DATA_CHANGED(za->entry+fileno)) { + _zip_error_set(&za->error, ZIP_ER_CHANGED, 0); + return NULL; + } + + if (fileno >= za->cdir->nentry) { + _zip_error_set(&za->error, ZIP_ER_INVAL, 0); + return NULL; + } + + zfflags = 0; + switch (za->cdir->entry[fileno].comp_method) { + case ZIP_CM_STORE: + zfflags |= ZIP_ZF_CRC; + break; + + case ZIP_CM_DEFLATE: + if ((flags & ZIP_FL_COMPRESSED) == 0) + zfflags |= ZIP_ZF_CRC | ZIP_ZF_DECOMP; + break; + default: + if ((flags & ZIP_FL_COMPRESSED) == 0) { + _zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0); + return NULL; + } + break; + } + + zf = _zip_file_new(za); + + zf->flags = zfflags; + /* zf->name = za->cdir->entry[fileno].filename; */ + zf->method = za->cdir->entry[fileno].comp_method; + zf->bytes_left = za->cdir->entry[fileno].uncomp_size; + zf->cbytes_left = za->cdir->entry[fileno].comp_size; + zf->crc_orig = za->cdir->entry[fileno].crc; + + if ((zf->fpos=_zip_file_get_offset(za, fileno)) == 0) { + zip_fclose(zf); + return NULL; + } + + if ((zf->flags & ZIP_ZF_DECOMP) == 0) + zf->bytes_left = zf->cbytes_left; + else { + if ((zf->buffer=(char *)malloc(BUFSIZE)) == NULL) { + _zip_error_set(&za->error, ZIP_ER_MEMORY, 0); + zip_fclose(zf); + return NULL; + } + + len = _zip_file_fillbuf(zf->buffer, BUFSIZE, zf); + if (len <= 0) { + _zip_error_copy(&za->error, &zf->error); + zip_fclose(zf); + return NULL; + } + + if ((zf->zstr = (z_stream *)malloc(sizeof(z_stream))) == NULL) { + _zip_error_set(&za->error, ZIP_ER_MEMORY, 0); + zip_fclose(zf); + return NULL; + } + zf->zstr->zalloc = Z_NULL; + zf->zstr->zfree = Z_NULL; + zf->zstr->opaque = NULL; + zf->zstr->next_in = (Bytef *)zf->buffer; + zf->zstr->avail_in = len; + + /* negative value to tell zlib that there is no header */ + if ((ret=inflateInit2(zf->zstr, -MAX_WBITS)) != Z_OK) { + _zip_error_set(&za->error, ZIP_ER_ZLIB, ret); + zip_fclose(zf); + return NULL; + } + } + + return zf; +} + + + +int +_zip_file_fillbuf(void *buf, size_t buflen, struct zip_file *zf) +{ + int i, j; + + if (zf->error.zip_err != ZIP_ER_OK) + return -1; + + if ((zf->flags & ZIP_ZF_EOF) || zf->cbytes_left <= 0 || buflen <= 0) + return 0; + + if (fseek(zf->za->zp, zf->fpos, SEEK_SET) < 0) { + _zip_error_set(&zf->error, ZIP_ER_SEEK, errno); + return -1; + } + if (buflen < zf->cbytes_left) + i = buflen; + else + i = zf->cbytes_left; + + j = fread(buf, 1, i, zf->za->zp); + if (j == 0) { + _zip_error_set(&zf->error, ZIP_ER_EOF, 0); + j = -1; + } + else if (j < 0) + _zip_error_set(&zf->error, ZIP_ER_READ, errno); + else { + zf->fpos += j; + zf->cbytes_left -= j; + } + + return j; +} + + + +static struct zip_file * +_zip_file_new(struct zip *za) +{ + struct zip_file *zf, **file; + int n; + + if ((zf=(struct zip_file *)malloc(sizeof(struct zip_file))) == NULL) { + _zip_error_set(&za->error, ZIP_ER_MEMORY, 0); + return NULL; + } + + if (za->nfile >= za->nfile_alloc-1) { + n = za->nfile_alloc + 10; + file = (struct zip_file **)realloc(za->file, + n*sizeof(struct zip_file *)); + if (file == NULL) { + _zip_error_set(&za->error, ZIP_ER_MEMORY, 0); + free(zf); + return NULL; + } + za->nfile_alloc = n; + za->file = file; + } + + za->file[za->nfile++] = zf; + + zf->za = za; + _zip_error_init(&zf->error); + zf->flags = 0; + zf->crc = crc32(0L, Z_NULL, 0); + zf->crc_orig = 0; + zf->method = -1; + zf->bytes_left = zf->cbytes_left = 0; + zf->fpos = 0; + zf->buffer = NULL; + zf->zstr = NULL; + + return zf; +} |