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395 lines
8.5 KiB
C
395 lines
8.5 KiB
C
/*
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zip_source_deflate.c -- deflate (de)compressoin routines
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Copyright (C) 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 <stdlib.h>
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#include <string.h>
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#include "zipint.h"
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struct deflate {
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int e[2];
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int eof;
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int mem_level;
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zip_uint64_t size;
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char buffer[BUFSIZE];
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z_stream zstr;
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};
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static zip_int64_t compress_read(struct zip_source *, struct deflate *,
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void *, zip_uint64_t);
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static zip_int64_t decompress_read(struct zip_source *, struct deflate *,
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void *, zip_uint64_t);
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static zip_int64_t deflate_compress(struct zip_source *, void *, void *,
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zip_uint64_t, enum zip_source_cmd);
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static zip_int64_t deflate_decompress(struct zip_source *, void *, void *,
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zip_uint64_t, enum zip_source_cmd);
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static void deflate_free(struct deflate *);
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ZIP_EXTERN(struct zip_source *)
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zip_source_deflate(struct zip *za, struct zip_source *src,
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zip_uint16_t cm, int flags)
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{
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struct deflate *ctx;
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struct zip_source *s2;
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if (src == NULL || cm != ZIP_CM_DEFLATE) {
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_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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return NULL;
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}
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if ((ctx=(struct deflate *)malloc(sizeof(*ctx))) == NULL) {
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_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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return NULL;
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}
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ctx->e[0] = ctx->e[1] = 0;
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ctx->eof = 0;
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if (flags & ZIP_CODEC_ENCODE) {
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if (zip_get_archive_flag(za, ZIP_AFL_TORRENT, 0))
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ctx->mem_level = TORRENT_MEM_LEVEL;
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else
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ctx->mem_level = MAX_MEM_LEVEL;
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}
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if ((s2=zip_source_layered(za, src,
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((flags & ZIP_CODEC_ENCODE)
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? deflate_compress : deflate_decompress),
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ctx)) == NULL) {
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deflate_free(ctx);
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return NULL;
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}
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return s2;
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}
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static zip_int64_t
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compress_read(struct zip_source *src, struct deflate *ctx,
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void *data, zip_uint64_t len)
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{
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int end, ret;
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zip_int64_t n;
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if (ctx->e[0] != 0)
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return -1;
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if (len == 0)
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return 0;
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ctx->zstr.next_out = (Bytef *)data;
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ctx->zstr.avail_out = len;
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end = 0;
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while (!end) {
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ret = deflate(&ctx->zstr, ctx->eof ? Z_FINISH : 0);
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switch (ret) {
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case Z_OK:
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case Z_STREAM_END:
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/* all ok */
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if (ctx->zstr.avail_out == 0
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|| (ctx->eof && ctx->zstr.avail_in == 0))
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end = 1;
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break;
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case Z_BUF_ERROR:
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if (ctx->zstr.avail_in == 0) {
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if (ctx->eof) {
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end = 1;
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break;
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}
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if ((n=zip_source_read(src, ctx->buffer,
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sizeof(ctx->buffer))) < 0) {
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zip_source_error(src, ctx->e, ctx->e+1);
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end = 1;
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break;
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}
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else if (n == 0) {
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ctx->eof = 1;
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ctx->size = ctx->zstr.total_in;
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/* XXX: check against stat of src? */
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}
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else {
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ctx->zstr.next_in = (Bytef *)ctx->buffer;
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ctx->zstr.avail_in = n;
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}
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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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ctx->e[0] = ZIP_ER_ZLIB;
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ctx->e[1] = ret;
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end = 1;
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break;
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}
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}
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if (ctx->zstr.avail_out < len)
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return len - ctx->zstr.avail_out;
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return (ctx->e[0] == 0) ? 0 : -1;
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}
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static zip_int64_t
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decompress_read(struct zip_source *src, struct deflate *ctx,
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void *data, zip_uint64_t len)
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{
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int end, ret;
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zip_int64_t n;
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if (ctx->e[0] != 0)
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return -1;
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if (len == 0)
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return 0;
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ctx->zstr.next_out = (Bytef *)data;
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ctx->zstr.avail_out = len;
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end = 0;
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while (!end && ctx->zstr.avail_out) {
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ret = inflate(&ctx->zstr, Z_SYNC_FLUSH);
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switch (ret) {
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case Z_OK:
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break;
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case Z_STREAM_END:
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ctx->eof = 1;
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end = 1;
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break;
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case Z_BUF_ERROR:
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if (ctx->zstr.avail_in == 0) {
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if (ctx->eof) {
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end = 1;
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break;
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}
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if ((n=zip_source_read(src, ctx->buffer,
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sizeof(ctx->buffer))) < 0) {
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zip_source_error(src, ctx->e, ctx->e+1);
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end = 1;
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break;
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}
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else if (n == 0)
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ctx->eof = 1;
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else {
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ctx->zstr.next_in = (Bytef *)ctx->buffer;
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ctx->zstr.avail_in = n;
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}
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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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ctx->e[0] = ZIP_ER_ZLIB;
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ctx->e[1] = ret;
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end = 1;
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break;
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}
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}
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if (ctx->zstr.avail_out < len)
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return len - ctx->zstr.avail_out;
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return (ctx->e[0] == 0) ? 0 : -1;
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}
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static zip_int64_t
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deflate_compress(struct zip_source *src, void *ud, void *data,
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zip_uint64_t len, enum zip_source_cmd cmd)
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{
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struct deflate *ctx;
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int ret;
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ctx = (struct deflate *)ud;
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switch (cmd) {
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case ZIP_SOURCE_OPEN:
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ctx->zstr.zalloc = Z_NULL;
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ctx->zstr.zfree = Z_NULL;
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ctx->zstr.opaque = NULL;
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ctx->zstr.avail_in = 0;
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ctx->zstr.next_in = NULL;
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ctx->zstr.avail_out = 0;
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ctx->zstr.next_out = NULL;
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/* negative value to tell zlib not to write a header */
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if ((ret=deflateInit2(&ctx->zstr, Z_BEST_COMPRESSION, Z_DEFLATED,
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-MAX_WBITS, ctx->mem_level,
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Z_DEFAULT_STRATEGY)) != Z_OK) {
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ctx->e[0] = ZIP_ER_ZLIB;
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ctx->e[1] = ret;
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return -1;
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}
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return 0;
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case ZIP_SOURCE_READ:
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return compress_read(src, ctx, data, len);
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case ZIP_SOURCE_CLOSE:
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deflateEnd(&ctx->zstr);
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return 0;
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case ZIP_SOURCE_STAT:
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{
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struct zip_stat *st;
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st = (struct zip_stat *)data;
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st->comp_method = ZIP_CM_DEFLATE;
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st->valid |= ZIP_STAT_COMP_METHOD;
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if (ctx->eof) {
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st->comp_size = ctx->size;
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st->valid |= ZIP_STAT_COMP_SIZE;
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}
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else
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st->valid &= ~ZIP_STAT_COMP_SIZE;
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}
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return 0;
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case ZIP_SOURCE_ERROR:
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memcpy(data, ctx->e, sizeof(int)*2);
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return sizeof(int)*2;
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case ZIP_SOURCE_FREE:
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deflate_free(ctx);
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return 0;
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default:
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ctx->e[0] = ZIP_ER_INVAL;
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ctx->e[1] = 0;
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return -1;
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}
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}
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static zip_int64_t
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deflate_decompress(struct zip_source *src, void *ud, void *data,
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zip_uint64_t len, enum zip_source_cmd cmd)
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{
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struct deflate *ctx;
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zip_int64_t n;
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int ret;
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ctx = (struct deflate *)ud;
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switch (cmd) {
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case ZIP_SOURCE_OPEN:
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if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0)
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return ZIP_SOURCE_ERR_LOWER;
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ctx->zstr.zalloc = Z_NULL;
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ctx->zstr.zfree = Z_NULL;
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ctx->zstr.opaque = NULL;
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ctx->zstr.next_in = (Bytef *)ctx->buffer;
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ctx->zstr.avail_in = n;
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/* negative value to tell zlib that there is no header */
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if ((ret=inflateInit2(&ctx->zstr, -MAX_WBITS)) != Z_OK) {
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ctx->e[0] = ZIP_ER_ZLIB;
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ctx->e[1] = ret;
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return -1;
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}
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return 0;
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case ZIP_SOURCE_READ:
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return decompress_read(src, ctx, data, len);
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case ZIP_SOURCE_CLOSE:
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inflateEnd(&ctx->zstr);
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return 0;
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case ZIP_SOURCE_STAT:
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{
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struct zip_stat *st;
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st = (struct zip_stat *)data;
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st->comp_method = ZIP_CM_STORE;
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if (st->comp_size > 0 && st->size > 0)
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st->comp_size = st->size;
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}
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return 0;
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case ZIP_SOURCE_ERROR:
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if (len < sizeof(int)*2)
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return -1;
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memcpy(data, ctx->e, sizeof(int)*2);
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return sizeof(int)*2;
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case ZIP_SOURCE_FREE:
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/* XXX: inflateEnd if close was not called */
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free(ctx);
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return 0;
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default:
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ctx->e[0] = ZIP_ER_INVAL;
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ctx->e[1] = 0;
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return -1;
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}
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}
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static void
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deflate_free(struct deflate *ctx)
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{
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/* XXX: deflateEnd if close was not called */
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free(ctx);
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}
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