131 lines
3.5 KiB
C
Executable File
131 lines
3.5 KiB
C
Executable File
/*
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zip_fread.c -- read from file
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Copyright (C) 1999-2009 Dieter Baron and Thomas Klausner
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This file is part of libzip, a library to manipulate ZIP archives.
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The authors can be contacted at <libzip@nih.at>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The names of the authors may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "zipint.h"
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ZIP_EXTERN ssize_t
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zip_fread(struct zip_file *zf, void *outbuf, size_t toread)
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{
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int ret;
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size_t out_before, len;
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int i;
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if (!zf)
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return -1;
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if (zf->error.zip_err != 0)
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return -1;
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if ((zf->flags & ZIP_ZF_EOF) || (toread == 0))
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return 0;
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if (zf->bytes_left == 0) {
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zf->flags |= ZIP_ZF_EOF;
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if (zf->flags & ZIP_ZF_CRC) {
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if (zf->crc != zf->crc_orig) {
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_zip_error_set(&zf->error, ZIP_ER_CRC, 0);
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return -1;
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}
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}
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return 0;
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}
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if ((zf->flags & ZIP_ZF_DECOMP) == 0) {
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ret = _zip_file_fillbuf(outbuf, toread, zf);
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if (ret > 0) {
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if (zf->flags & ZIP_ZF_CRC)
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zf->crc = crc32(zf->crc, (Bytef *)outbuf, ret);
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zf->bytes_left -= ret;
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}
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return ret;
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}
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zf->zstr->next_out = (Bytef *)outbuf;
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zf->zstr->avail_out = toread;
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out_before = zf->zstr->total_out;
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/* endless loop until something has been accomplished */
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for (;;) {
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ret = inflate(zf->zstr, Z_SYNC_FLUSH);
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switch (ret) {
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case Z_STREAM_END:
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if (zf->zstr->total_out == out_before) {
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if (zf->crc != zf->crc_orig) {
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_zip_error_set(&zf->error, ZIP_ER_CRC, 0);
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return -1;
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}
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else
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return 0;
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}
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/* fallthrough */
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case Z_OK:
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len = zf->zstr->total_out - out_before;
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if (len >= zf->bytes_left || len >= toread) {
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if (zf->flags & ZIP_ZF_CRC)
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zf->crc = crc32(zf->crc, (Bytef *)outbuf, len);
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zf->bytes_left -= len;
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return len;
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}
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break;
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case Z_BUF_ERROR:
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if (zf->zstr->avail_in == 0) {
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i = _zip_file_fillbuf(zf->buffer, BUFSIZE, zf);
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if (i == 0) {
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_zip_error_set(&zf->error, ZIP_ER_INCONS, 0);
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return -1;
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}
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else if (i < 0)
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return -1;
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zf->zstr->next_in = (Bytef *)zf->buffer;
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zf->zstr->avail_in = i;
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continue;
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}
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/* fallthrough */
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case Z_NEED_DICT:
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case Z_DATA_ERROR:
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case Z_STREAM_ERROR:
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case Z_MEM_ERROR:
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_zip_error_set(&zf->error, ZIP_ER_ZLIB, ret);
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return -1;
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}
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}
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}
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