gecko/modules/brotli/README.mozilla

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This is the Brotli data compression library from
https://github.com/google/brotli.
Currently, we import only the Brotli decoder (the /dec/ subdirectory), not the
encoder (/enc/ subdirectory).
Upstream code can be viewed at
https://github.com/google/brotli/tree/master/dec
and cloned by
git clone https://github.com/google/brotli
The in-tree copy is updated by running
sh update.sh
from within the modules/brotli directory.
Current version: [commit 933bb9bd800c8f5f7f6a02382d33c902a98ef73a].
this trivial patch is added to preserve no-warnings behavior in code
that includes the brotli interface. future imports are expected to
have an equivalent change made upstream already.
diff --git a/modules/brotli/dec/bit_reader.h b/modules/brotli/dec/bit_reader.h
--- a/modules/brotli/dec/bit_reader.h
+++ b/modules/brotli/dec/bit_reader.h
@@ -284,17 +284,17 @@ static BROTLI_INLINE int BrotliPeekByte(
int bytes_left = (int)(sizeof(br->val_) - (br->bit_pos_ >> 3));
if (br->bit_pos_ & 7) {
return -1;
}
if (offset < bytes_left) {
return (br->val_ >> (br->bit_pos_ + (unsigned)(offset << 3))) & 0xFF;
}
offset -= bytes_left;
- if (offset < br->avail_in) {
+ if (offset < (long)br->avail_in) {
return br->next_in[offset];
}
return -1;
}
/* Copies remaining input bytes stored in the bit reader to the output. Value
num may not be larger than BrotliGetRemainingBytes. The bit reader must be
warmed up again after this. */
This patch fixes a use-before declare error on big endian platforms
in bit_reader.h. Upstream has already fixed this error by re-arranging
some functions in the file.
diff --git a/modules/brotli/dec/bit_reader.h b/modules/brotli/dec/bit_reader.h
--- a/modules/brotli/dec/bit_reader.h
+++ b/modules/brotli/dec/bit_reader.h
@@ -58,17 +58,17 @@ typedef struct {
/* Initializes the bitreader fields. */
void BrotliInitBitReader(BrotliBitReader* const br, BrotliInput input);
/* Ensures that accumulator is not empty. May consume one byte of input.
Returns 0 if data is required but there is no input available.
For BROTLI_BUILD_PORTABLE this function also prepares bit reader for aligned
reading. */
int BrotliWarmupBitReader(BrotliBitReader* const br);
-
+static BROTLI_INLINE void BrotliPullByte(BrotliBitReader* const br);
/* Pulls data from the input to the the read buffer.
Returns 0 if one of:
- the input callback returned an error, or
- there is no more input and the position is past the end of the stream.
- finish is false and less than BROTLI_READ_SIZE are available - a next call
when more data is available makes it continue including the partially read
data