Initial commit of all previous Chrome build scripts.

chromium/patches/ugly/07_get_bits_overrun.patch

+diff -wurp -N orig/libavcodec/get_bits.h ffmpeg/libavcodec/get_bits.h
+--- orig/libavcodec/get_bits.h  2011-07-12 20:47:45.164235088 -0700
++++ ffmpeg/libavcodec/get_bits.h        2011-07-12 20:47:45.252997950 -0700
+@@ -52,9 +52,16 @@
+ /* buffer, buffer_end and size_in_bits must be present and used by every reader */
+ typedef struct GetBitContext {
+     const uint8_t *buffer, *buffer_end;
++    /* Ugly, but clients of this bit reader do not seem to check for enough
++     * data before calling. So we'll return 0's on overrun rather than crashing
++     * with random read faults.
++     */
++    int buffer_exhausted;
++    int buffer_enforcing;
+ #ifdef ALT_BITSTREAM_READER
+     int index;
+ #elif defined A32_BITSTREAM_READER
++#warning TODO - secure this against read overrun
+     uint32_t *buffer_ptr;
+     uint32_t cache0;
+     uint32_t cache1;
+@@ -133,18 +140,26 @@ for examples see get_bits, show_bits, sk
+ 
+ # ifdef ALT_BITSTREAM_READER_LE
+ #   define UPDATE_CACHE(name, gb) \
+-    name##_cache = AV_RL32(((const uint8_t *)(gb)->buffer)+(name##_index>>3)) >> (name##_index&0x07)
++    if (!(gb)->buffer_exhausted)\
++        name##_cache = AV_RL32(((const uint8_t *)(gb)->buffer)+(name##_index>>3)) >> (name##_index&0x07);\
++    else\
++        name##_cache = 0;
+ 
+ #   define SKIP_CACHE(name, gb, num) name##_cache >>= (num)
+ # else
+ #   define UPDATE_CACHE(name, gb) \
+-    name##_cache = AV_RB32(((const uint8_t *)(gb)->buffer)+(name##_index>>3)) << (name##_index&0x07)
++    if (!(gb)->buffer_exhausted)\
++        name##_cache = AV_RB32(((const uint8_t *)(gb)->buffer)+(name##_index>>3)) << (name##_index&0x07);\
++    else\
++        name##_cache = 0;
+ 
+ #   define SKIP_CACHE(name, gb, num) name##_cache <<= (num)
+ # endif
+ 
+ // FIXME name?
+-#   define SKIP_COUNTER(name, gb, num) name##_index += (num)
++#   define SKIP_COUNTER(name, gb, num) name##_index += (num);\
++        if ((gb)->buffer_enforcing && name##_index >= (gb)->size_in_bits)\
++            (gb)->buffer_exhausted = 1;\
+ 
+ #   define SKIP_BITS(name, gb, num) do {        \
+         SKIP_CACHE(name, gb, num);              \
+@@ -172,6 +187,12 @@ static inline int get_bits_count(const G
+ 
+ static inline void skip_bits_long(GetBitContext *s, int n){
+     s->index += n;
++    if (s->buffer_enforcing) {
++        if (n < 0 && s->index < s->size_in_bits)
++            s->buffer_exhausted = 0;
++        else if (s->index >= s->size_in_bits)
++            s->buffer_exhausted = 1;
++    }
+ }
+ 
+ #elif defined A32_BITSTREAM_READER
+@@ -301,7 +322,10 @@ static inline void skip_bits(GetBitConte
+ }
+ 
+ static inline unsigned int get_bits1(GetBitContext *s){
++    if (s->buffer_exhausted)
++        return 0;
+ #ifdef ALT_BITSTREAM_READER
++  {
+     unsigned int index = s->index;
+     uint8_t result = s->buffer[index>>3];
+ #ifdef ALT_BITSTREAM_READER_LE
+@@ -312,9 +336,12 @@ static inline unsigned int get_bits1(Get
+     result >>= 8 - 1;
+ #endif
+     index++;
++    if (s->buffer_enforcing && index >= s->size_in_bits)
++        s->buffer_exhausted = 1;
+     s->index = index;
+ 
+     return result;
++  }
+ #else
+     return get_bits(s, 1);
+ #endif
+@@ -392,6 +419,8 @@ static inline void init_get_bits(GetBitC
+     s->buffer       = buffer;
+     s->size_in_bits = bit_size;
+     s->buffer_end   = buffer + buffer_size;
++    s->buffer_exhausted = 0;
++    s->buffer_enforcing = 0;
+ #ifdef ALT_BITSTREAM_READER
+     s->index        = 0;
+ #elif defined A32_BITSTREAM_READER