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-rw-r--r--src/Common/libzip/zip_source_deflate.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_deflate.c b/src/Common/libzip/zip_source_deflate.c
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+++ b/src/Common/libzip/zip_source_deflate.c
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+/*
+ zip_source_deflate.c -- deflate (de)compressoin routines
+ Copyright (C) 2009-2015 Dieter Baron and Thomas Klausner
+
+ This file is part of libzip, a library to manipulate ZIP archives.
+ The authors can be contacted at <libzip@nih.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 <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include "zipint.h"
+
+struct deflate {
+ zip_error_t error;
+
+ bool eof;
+ bool can_store;
+ bool is_stored;
+ int mem_level;
+ zip_uint64_t size;
+ zip_uint8_t buffer[BUFSIZE];
+ z_stream zstr;
+};
+
+static zip_int64_t compress_read(zip_source_t *, struct deflate *, void *, zip_uint64_t);
+static zip_int64_t decompress_read(zip_source_t *, struct deflate *, void *, zip_uint64_t);
+static zip_int64_t deflate_compress(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
+static zip_int64_t deflate_decompress(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
+static void deflate_free(struct deflate *);
+
+
+zip_source_t *
+zip_source_deflate(zip_t *za, zip_source_t *src, zip_int32_t cm, int flags)
+{
+ struct deflate *ctx;
+ zip_source_t *s2;
+
+ if (src == NULL || (cm != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(cm))) {
+ zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+ return NULL;
+ }
+
+ if ((ctx=(struct deflate *)malloc(sizeof(*ctx))) == NULL) {
+ zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+ return NULL;
+ }
+
+ zip_error_init(&ctx->error);
+ ctx->eof = false;
+ ctx->is_stored = false;
+ ctx->can_store = ZIP_CM_IS_DEFAULT(cm);
+ if (flags & ZIP_CODEC_ENCODE) {
+ ctx->mem_level = MAX_MEM_LEVEL;
+ }
+
+ if ((s2=zip_source_layered(za, src,
+ ((flags & ZIP_CODEC_ENCODE)
+ ? deflate_compress : deflate_decompress),
+ ctx)) == NULL) {
+ deflate_free(ctx);
+ return NULL;
+ }
+
+ return s2;
+}
+
+
+static zip_int64_t
+compress_read(zip_source_t *src, struct deflate *ctx, void *data, zip_uint64_t len)
+{
+ int end, ret;
+ zip_int64_t n;
+ zip_uint64_t out_offset;
+ uInt out_len;
+
+ if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK)
+ return -1;
+
+ if (len == 0 || ctx->is_stored) {
+ return 0;
+ }
+
+ out_offset = 0;
+ out_len = (uInt)ZIP_MIN(UINT_MAX, len);
+ ctx->zstr.next_out = (Bytef *)data;
+ ctx->zstr.avail_out = out_len;
+
+ end = 0;
+ while (!end) {
+ ret = deflate(&ctx->zstr, ctx->eof ? Z_FINISH : 0);
+
+ switch (ret) {
+ case Z_STREAM_END:
+ if (ctx->can_store && ctx->zstr.total_in <= ctx->zstr.total_out) {
+ ctx->is_stored = true;
+ ctx->size = ctx->zstr.total_in;
+ memcpy(data, ctx->buffer, ctx->size);
+ return (zip_int64_t)ctx->size;
+ }
+ /* fallthrough */
+ case Z_OK:
+ /* all ok */
+
+ if (ctx->zstr.avail_out == 0) {
+ out_offset += out_len;
+ if (out_offset < len) {
+ out_len = (uInt)ZIP_MIN(UINT_MAX, len-out_offset);
+ ctx->zstr.next_out = (Bytef *)data+out_offset;
+ ctx->zstr.avail_out = out_len;
+ }
+ else {
+ ctx->can_store = false;
+ end = 1;
+ }
+ }
+ else if (ctx->eof && ctx->zstr.avail_in == 0)
+ end = 1;
+ break;
+
+ case Z_BUF_ERROR:
+ if (ctx->zstr.avail_in == 0) {
+ if (ctx->eof) {
+ end = 1;
+ break;
+ }
+
+ if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ end = 1;
+ break;
+ }
+ else if (n == 0) {
+ ctx->eof = true;
+ /* TODO: check against stat of src? */
+ ctx->size = ctx->zstr.total_in;
+ }
+ else {
+ if (ctx->zstr.total_in > 0) {
+ /* we overwrote a previously filled ctx->buffer */
+ ctx->can_store = false;
+ }
+ ctx->zstr.next_in = (Bytef *)ctx->buffer;
+ ctx->zstr.avail_in = (uInt)n;
+ }
+ continue;
+ }
+ /* fallthrough */
+ case Z_NEED_DICT:
+ case Z_DATA_ERROR:
+ case Z_STREAM_ERROR:
+ case Z_MEM_ERROR:
+ zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret);
+
+ end = 1;
+ break;
+ }
+ }
+
+ if (ctx->zstr.avail_out < len) {
+ ctx->can_store = false;
+ return (zip_int64_t)(len - ctx->zstr.avail_out);
+ }
+
+ return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1;
+}
+
+
+static zip_int64_t
+decompress_read(zip_source_t *src, struct deflate *ctx, void *data, zip_uint64_t len)
+{
+ int end, ret;
+ zip_int64_t n;
+ zip_uint64_t out_offset;
+ uInt out_len;
+
+ if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK)
+ return -1;
+
+ if (len == 0)
+ return 0;
+
+ out_offset = 0;
+ out_len = (uInt)ZIP_MIN(UINT_MAX, len);
+ ctx->zstr.next_out = (Bytef *)data;
+ ctx->zstr.avail_out = out_len;
+
+ end = 0;
+ while (!end) {
+ ret = inflate(&ctx->zstr, Z_SYNC_FLUSH);
+
+ switch (ret) {
+ case Z_OK:
+ if (ctx->zstr.avail_out == 0) {
+ out_offset += out_len;
+ if (out_offset < len) {
+ out_len = (uInt)ZIP_MIN(UINT_MAX, len-out_offset);
+ ctx->zstr.next_out = (Bytef *)data+out_offset;
+ ctx->zstr.avail_out = out_len;
+ }
+ else {
+ end = 1;
+ }
+ }
+ break;
+
+ case Z_STREAM_END:
+ ctx->eof = 1;
+ end = 1;
+ break;
+
+ case Z_BUF_ERROR:
+ if (ctx->zstr.avail_in == 0) {
+ if (ctx->eof) {
+ end = 1;
+ break;
+ }
+
+ if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ end = 1;
+ break;
+ }
+ else if (n == 0) {
+ ctx->eof = 1;
+ }
+ else {
+ ctx->zstr.next_in = (Bytef *)ctx->buffer;
+ ctx->zstr.avail_in = (uInt)n;
+ }
+ continue;
+ }
+ /* fallthrough */
+ case Z_NEED_DICT:
+ case Z_DATA_ERROR:
+ case Z_STREAM_ERROR:
+ case Z_MEM_ERROR:
+ zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret);
+ end = 1;
+ break;
+ }
+ }
+
+ if (ctx->zstr.avail_out < len)
+ return (zip_int64_t)(len - ctx->zstr.avail_out);
+
+ return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1;
+}
+
+
+static zip_int64_t
+deflate_compress(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd)
+{
+ struct deflate *ctx;
+ int ret;
+
+ ctx = (struct deflate *)ud;
+
+ switch (cmd) {
+ case ZIP_SOURCE_OPEN:
+ ctx->zstr.zalloc = Z_NULL;
+ ctx->zstr.zfree = Z_NULL;
+ ctx->zstr.opaque = NULL;
+ ctx->zstr.avail_in = 0;
+ ctx->zstr.next_in = NULL;
+ ctx->zstr.avail_out = 0;
+ ctx->zstr.next_out = NULL;
+
+ /* negative value to tell zlib not to write a header */
+ if ((ret=deflateInit2(&ctx->zstr, Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS, ctx->mem_level, Z_DEFAULT_STRATEGY)) != Z_OK) {
+ zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret);
+ return -1;
+ }
+
+ return 0;
+
+ case ZIP_SOURCE_READ:
+ return compress_read(src, ctx, data, len);
+
+ case ZIP_SOURCE_CLOSE:
+ deflateEnd(&ctx->zstr);
+ return 0;
+
+ case ZIP_SOURCE_STAT:
+ {
+ zip_stat_t *st;
+
+ st = (zip_stat_t *)data;
+
+ st->comp_method = ctx->is_stored ? ZIP_CM_STORE : ZIP_CM_DEFLATE;
+ st->valid |= ZIP_STAT_COMP_METHOD;
+ if (ctx->eof) {
+ st->comp_size = ctx->size;
+ st->valid |= ZIP_STAT_COMP_SIZE;
+ }
+ else
+ st->valid &= ~ZIP_STAT_COMP_SIZE;
+ }
+ return 0;
+
+ case ZIP_SOURCE_ERROR:
+ return zip_error_to_data(&ctx->error, data, len);
+
+ case ZIP_SOURCE_FREE:
+ deflate_free(ctx);
+ return 0;
+
+ case ZIP_SOURCE_SUPPORTS:
+ return ZIP_SOURCE_SUPPORTS_READABLE;
+
+ default:
+ zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
+ return -1;
+ }
+}
+
+
+static zip_int64_t
+deflate_decompress(zip_source_t *src, void *ud, void *data,
+ zip_uint64_t len, zip_source_cmd_t cmd)
+{
+ struct deflate *ctx;
+ zip_int64_t n;
+ int ret;
+
+ ctx = (struct deflate *)ud;
+
+ switch (cmd) {
+ case ZIP_SOURCE_OPEN:
+ if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+
+ ctx->zstr.zalloc = Z_NULL;
+ ctx->zstr.zfree = Z_NULL;
+ ctx->zstr.opaque = NULL;
+ ctx->zstr.next_in = (Bytef *)ctx->buffer;
+ ctx->zstr.avail_in = (uInt)n;
+
+ /* negative value to tell zlib that there is no header */
+ if ((ret=inflateInit2(&ctx->zstr, -MAX_WBITS)) != Z_OK) {
+ zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret);
+ return -1;
+ }
+ return 0;
+
+ case ZIP_SOURCE_READ:
+ return decompress_read(src, ctx, data, len);
+
+ case ZIP_SOURCE_CLOSE:
+ inflateEnd(&ctx->zstr);
+ return 0;
+
+ case ZIP_SOURCE_STAT:
+ {
+ zip_stat_t *st;
+
+ st = (zip_stat_t *)data;
+
+ st->comp_method = ZIP_CM_STORE;
+ if (st->comp_size > 0 && st->size > 0)
+ st->comp_size = st->size;
+
+ return 0;
+ }
+
+ case ZIP_SOURCE_ERROR:
+ return zip_error_to_data(&ctx->error, data, len);
+
+ case ZIP_SOURCE_FREE:
+ free(ctx);
+ return 0;
+
+ case ZIP_SOURCE_SUPPORTS:
+ return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, -1);
+
+ default:
+ zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
+ return -1;
+ }
+}
+
+
+static void
+deflate_free(struct deflate *ctx)
+{
+ free(ctx);
+}