[SCM] libav/wheezy-security: bytestream: add bytestream2_copy_buffer() functions
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 1 21:36:13 UTC 2014
The following commit has been merged in the wheezy-security branch:
commit fa60904ebd58da33abf10b05e9933d24619cf096
Author: Justin Ruggles <justin.ruggles at gmail.com>
Date: Sun Sep 29 19:45:57 2013 -0400
bytestream: add bytestream2_copy_buffer() functions
This is basically an overread/overwrite-safe memcpy between a
GetByteContext and a PutByteContext.
CC:libav-stable at libav.org
(cherry picked from commit 5748faf291fec297ef25d81962b52b3438f54278)
diff --git a/libavcodec/bytestream.h b/libavcodec/bytestream.h
index 091cab8..6177241 100644
--- a/libavcodec/bytestream.h
+++ b/libavcodec/bytestream.h
@@ -333,6 +333,32 @@ static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
return p->eof;
}
+static av_always_inline unsigned int bytestream2_copy_bufferu(PutByteContext *p,
+ GetByteContext *g,
+ unsigned int size)
+{
+ memcpy(p->buffer, g->buffer, size);
+ p->buffer += size;
+ g->buffer += size;
+ return size;
+}
+
+static av_always_inline unsigned int bytestream2_copy_buffer(PutByteContext *p,
+ GetByteContext *g,
+ unsigned int size)
+{
+ int size2;
+
+ if (p->eof)
+ return 0;
+ size = FFMIN(g->buffer_end - g->buffer, size);
+ size2 = FFMIN(p->buffer_end - p->buffer, size);
+ if (size2 != size)
+ p->eof = 1;
+
+ return bytestream2_copy_bufferu(p, g, size2);
+}
+
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
uint8_t *dst,
unsigned int size)
--
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