VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/libzip/zip_source_seek.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/Common/libzip/zip_source_seek.c')
-rw-r--r--src/Common/libzip/zip_source_seek.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_seek.c b/src/Common/libzip/zip_source_seek.c
new file mode 100644
index 00000000..c3f47036
--- /dev/null
+++ b/src/Common/libzip/zip_source_seek.c
@@ -0,0 +1,92 @@
+/*
+ zip_source_seek.c -- seek to offset
+ Copyright (C) 2014 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 "zipint.h"
+
+
+ZIP_EXTERN int
+zip_source_seek(zip_source_t *src, zip_int64_t offset, int whence)
+{
+ zip_source_args_seek_t args;
+
+ if (src->source_closed) {
+ return -1;
+ }
+ if (!ZIP_SOURCE_IS_OPEN_READING(src) || (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END)) {
+ zip_error_set(&src->error, ZIP_ER_INVAL, 0);
+ return -1;
+ }
+
+ args.offset = offset;
+ args.whence = whence;
+
+ return (_zip_source_call(src, &args, sizeof(args), ZIP_SOURCE_SEEK) < 0 ? -1 : 0);
+}
+
+
+zip_int64_t
+zip_source_seek_compute_offset(zip_uint64_t offset, zip_uint64_t length, void *data, zip_uint64_t data_length, zip_error_t *error)
+{
+ zip_int64_t new_offset;
+ zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, data_length, error);
+
+ if (args == NULL) {
+ return -1;
+ }
+
+ switch (args->whence) {
+ case SEEK_CUR:
+ new_offset = (zip_int64_t)offset + args->offset;
+ break;
+
+ case SEEK_END:
+ new_offset = (zip_int64_t)length + args->offset;
+ break;
+
+ case SEEK_SET:
+ new_offset = args->offset;
+ break;
+
+ default:
+ zip_error_set(error, ZIP_ER_INVAL, 0);
+ return -1;
+ }
+
+ if (new_offset < 0 || (zip_uint64_t)new_offset > length) {
+ zip_error_set(error, ZIP_ER_INVAL, 0);
+ return -1;
+ }
+
+ return new_offset;
+}