VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/libzip/zip_source_crc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/Common/libzip/zip_source_crc.c')
-rw-r--r--src/Common/libzip/zip_source_crc.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_crc.c b/src/Common/libzip/zip_source_crc.c
new file mode 100644
index 00000000..01f526c6
--- /dev/null
+++ b/src/Common/libzip/zip_source_crc.c
@@ -0,0 +1,202 @@
+/*
+ zip_source_crc.c -- pass-through source that calculates CRC32 and size
+ Copyright (C) 2009-2016 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 crc_context {
+ int validate; /* whether to check CRC on EOF and return error on mismatch */
+ int crc_complete; /* whether CRC was computed for complete file */
+ zip_error_t error;
+ zip_uint64_t size;
+ zip_uint64_t position; /* current reading position */
+ zip_uint64_t crc_position; /* how far we've computed the CRC */
+ zip_uint32_t crc;
+};
+
+static zip_int64_t crc_read(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
+
+
+zip_source_t *
+zip_source_crc(zip_t *za, zip_source_t *src, int validate)
+{
+ struct crc_context *ctx;
+
+ if (src == NULL) {
+ zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+ return NULL;
+ }
+
+ if ((ctx=(struct crc_context *)malloc(sizeof(*ctx))) == NULL) {
+ zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+ return NULL;
+ }
+
+ zip_error_init(&ctx->error);
+ ctx->validate = validate;
+ ctx->crc_complete = 0;
+ ctx->crc_position = 0;
+ ctx->crc = (zip_uint32_t)crc32(0, NULL, 0);
+ ctx->size = 0;
+
+ return zip_source_layered(za, src, crc_read, ctx);
+}
+
+
+static zip_int64_t
+crc_read(zip_source_t *src, void *_ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd)
+{
+ struct crc_context *ctx;
+ zip_int64_t n;
+
+ ctx = (struct crc_context *)_ctx;
+
+ switch (cmd) {
+ case ZIP_SOURCE_OPEN:
+ ctx->position = 0;
+ return 0;
+
+ case ZIP_SOURCE_READ:
+ if ((n = zip_source_read(src, data, len)) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+
+ if (n == 0) {
+ if (ctx->crc_position == ctx->position) {
+ ctx->crc_complete = 1;
+ ctx->size = ctx->position;
+
+ if (ctx->validate) {
+ struct zip_stat st;
+
+ if (zip_source_stat(src, &st) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+
+ if ((st.valid & ZIP_STAT_CRC) && st.crc != ctx->crc) {
+ zip_error_set(&ctx->error, ZIP_ER_CRC, 0);
+ return -1;
+ }
+ if ((st.valid & ZIP_STAT_SIZE) && st.size != ctx->size) {
+ zip_error_set(&ctx->error, ZIP_ER_INCONS, 0);
+ return -1;
+ }
+ }
+ }
+ }
+ else if (!ctx->crc_complete && ctx->position <= ctx->crc_position) {
+ zip_uint64_t i, nn;
+
+ for (i = ctx->crc_position - ctx->position; i < (zip_uint64_t)n; i += nn) {
+ nn = ZIP_MIN(UINT_MAX, (zip_uint64_t)n-i);
+
+ ctx->crc = (zip_uint32_t)crc32(ctx->crc, (const Bytef *)data+i, (uInt)nn);
+ ctx->crc_position += nn;
+ }
+ }
+ ctx->position += (zip_uint64_t)n;
+ return n;
+
+ case ZIP_SOURCE_CLOSE:
+ return 0;
+
+ case ZIP_SOURCE_STAT:
+ {
+ zip_stat_t *st;
+
+ st = (zip_stat_t *)data;
+
+ if (ctx->crc_complete) {
+ /* TODO: Set comp_size, comp_method, encryption_method?
+ After all, this only works for uncompressed data. */
+ st->size = ctx->size;
+ st->crc = ctx->crc;
+ st->comp_size = ctx->size;
+ st->comp_method = ZIP_CM_STORE;
+ st->encryption_method = ZIP_EM_NONE;
+ st->valid |= ZIP_STAT_SIZE|ZIP_STAT_CRC|ZIP_STAT_COMP_SIZE|ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD;;
+ }
+ 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:
+ {
+ zip_int64_t mask = zip_source_supports(src);
+
+ if (mask < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+
+ return mask & ~zip_source_make_command_bitmap(ZIP_SOURCE_BEGIN_WRITE, ZIP_SOURCE_COMMIT_WRITE, ZIP_SOURCE_ROLLBACK_WRITE, ZIP_SOURCE_SEEK_WRITE, ZIP_SOURCE_TELL_WRITE, ZIP_SOURCE_REMOVE, -1);
+ }
+
+ case ZIP_SOURCE_SEEK:
+ {
+ zip_int64_t new_position;
+ zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
+
+ if (args == NULL) {
+ return -1;
+ }
+ if (zip_source_seek(src, args->offset, args->whence) < 0 || (new_position = zip_source_tell(src)) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+
+ ctx->position = (zip_uint64_t)new_position;
+
+ return 0;
+ }
+
+ case ZIP_SOURCE_TELL:
+ return (zip_int64_t)ctx->position;
+
+ default:
+ zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
+ return -1;
+ }
+}