VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/libzip/zip_filerange_crc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/Common/libzip/zip_filerange_crc.c')
-rw-r--r--src/Common/libzip/zip_filerange_crc.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_filerange_crc.c b/src/Common/libzip/zip_filerange_crc.c
new file mode 100644
index 00000000..f2a27fab
--- /dev/null
+++ b/src/Common/libzip/zip_filerange_crc.c
@@ -0,0 +1,76 @@
+/*
+ zip_filerange_crc.c -- compute CRC32 for a range of a file
+ Copyright (C) 2008-2015 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 <stdio.h>
+
+#include "zipint.h"
+
+
+
+int
+_zip_filerange_crc(zip_source_t *src, zip_uint64_t start, zip_uint64_t len, uLong *crcp, zip_error_t *error)
+{
+ Bytef buf[BUFSIZE];
+ zip_int64_t n;
+
+ *crcp = crc32(0L, Z_NULL, 0);
+
+ if (start > ZIP_INT64_MAX) {
+ zip_error_set(error, ZIP_ER_SEEK, EFBIG);
+ return -1;
+ }
+
+ if (zip_source_seek(src, (zip_int64_t)start, SEEK_SET) != 0) {
+ _zip_error_set_from_source(error, src);
+ return -1;
+ }
+
+ while (len > 0) {
+ n = (zip_int64_t)(len > BUFSIZE ? BUFSIZE : len);
+ if ((n = zip_source_read(src, buf, (zip_uint64_t)n)) < 0) {
+ _zip_error_set_from_source(error, src);
+ return -1;
+ }
+ if (n == 0) {
+ zip_error_set(error, ZIP_ER_EOF, 0);
+ return -1;
+ }
+
+ *crcp = crc32(*crcp, buf, (uInt)n);
+
+ len -= (zip_uint64_t)n;
+ }
+
+ return 0;
+}