diff options
Diffstat (limited to 'ext/zip/lib/zip_fread.c')
| -rw-r--r-- | ext/zip/lib/zip_fread.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/ext/zip/lib/zip_fread.c b/ext/zip/lib/zip_fread.c new file mode 100644 index 0000000000..aeb64c90fa --- /dev/null +++ b/ext/zip/lib/zip_fread.c @@ -0,0 +1,125 @@ +/* + $NiH: zip_fread.c,v 1.21 2006/04/23 14:49:50 wiz Exp $ + + zip_fread.c -- read from file + 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 "zip.h" +#include "zipint.h" + + + +ssize_t +zip_fread(struct zip_file *zf, void *outbuf, size_t toread) +{ + int ret; + size_t out_before, len; + int i; + + if (!zf) + return -1; + + if (zf->error.zip_err != 0) + return -1; + + if ((zf->flags & ZIP_ZF_EOF) || (toread == 0)) + return 0; + + if (zf->bytes_left == 0) { + zf->flags |= ZIP_ZF_EOF; + if (zf->flags & ZIP_ZF_CRC) { + if (zf->crc != zf->crc_orig) { + _zip_error_set(&zf->error, ZIP_ER_CRC, 0); + return -1; + } + } + return 0; + } + + if ((zf->flags & ZIP_ZF_DECOMP) == 0) { + ret = _zip_file_fillbuf(outbuf, toread, zf); + if (ret > 0) { + if (zf->flags & ZIP_ZF_CRC) + zf->crc = crc32(zf->crc, (Bytef *)outbuf, ret); + zf->bytes_left -= ret; + } + return ret; + } + + zf->zstr->next_out = (Bytef *)outbuf; + zf->zstr->avail_out = toread; + out_before = zf->zstr->total_out; + + /* endless loop until something has been accomplished */ + for (;;) { + ret = inflate(zf->zstr, Z_SYNC_FLUSH); + + switch (ret) { + case Z_OK: + case Z_STREAM_END: + /* all ok */ + /* Z_STREAM_END probably won't happen, since we didn't + have a header */ + len = zf->zstr->total_out - out_before; + if (len >= zf->bytes_left || len >= toread) { + if (zf->flags & ZIP_ZF_CRC) + zf->crc = crc32(zf->crc, (Bytef *)outbuf, len); + zf->bytes_left -= len; + return len; + } + break; + + case Z_BUF_ERROR: + if (zf->zstr->avail_in == 0) { + i = _zip_file_fillbuf(zf->buffer, BUFSIZE, zf); + if (i == 0) { + _zip_error_set(&zf->error, ZIP_ER_INCONS, 0); + return -1; + } + else if (i < 0) + return -1; + zf->zstr->next_in = (Bytef *)zf->buffer; + zf->zstr->avail_in = i; + continue; + } + /* fallthrough */ + case Z_NEED_DICT: + case Z_DATA_ERROR: + case Z_STREAM_ERROR: + case Z_MEM_ERROR: + _zip_error_set(&zf->error, ZIP_ER_ZLIB, ret); + return -1; + } + } +} |