return error if frame_offset is negative, prevent segfault

[ffmpeg] / libavformat / gif.c

diff --git a/libavformat/gif.c b/libavformat/gif.c
index 8092f374c07ebe700bde6e5097201429ef81d833..dab39a2afb91edc0ec0f009b6ea679b553f8e15e 100644 (file)
--- a/libavformat/gif.c
+++ b/libavformat/gif.c
@@ -40,7 +40,7 @@
  */
 
 #include "avformat.h"
-#include "bitstream.h"
+#include "libavcodec/bitstream.h"
 
 /* bitstream minipacket size */
 #define GIF_CHUNKS 100
@@ -137,7 +137,7 @@ static void gif_put_bits_rev(PutBitContext *s, int n, unsigned int value)
         //printf("bitbuf = %08x\n", bit_buf);
         s->buf_ptr+=4;
         if (s->buf_ptr >= s->buf_end)
-            puts("bit buffer overflow !!"); // should never happen ! who got rid of the callback ???
+            abort();
 //            flush_buffer_rev(s);
         bit_cnt=bit_cnt + n - 32;
         if (bit_cnt == 0) {
@@ -236,7 +236,7 @@ static int gif_image_write_header(ByteIOContext *pb,
 /* this is maybe slow, but allows for extensions */
 static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
 {
-    return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
+    return (((r) / 47) % 6) * 6 * 6 + (((g) / 47) % 6) * 6 + (((b) / 47) % 6);
 }