forked from mirror/brotli
Push output directly to dst instead of buffering.
This commit is contained in:
Andy Balholm
parent
625cbb6f92
commit
7c7a5a10ef
92
encode.go
92
encode.go
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@ -74,6 +74,7 @@ const (
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type Writer struct {
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dst io.Writer
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options WriterOptions
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err error
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params encoderParams
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hasher_ hasherHandle
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@ -102,9 +103,6 @@ type Writer struct {
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cmd_code_numbits_ uint
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command_buf_ []uint32
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literal_buf_ []byte
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next_out_ []byte
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available_out_ uint
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total_out_ uint
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tiny_buf_ struct {
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u64 [2]uint64
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u8 [16]byte
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@ -145,7 +143,7 @@ func wrapPosition(position uint64) uint32 {
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return result
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}
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func getBrotliStorage(s *Writer, size int) []byte {
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func (s *Writer) getStorage(size int) []byte {
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if len(s.storage) < size {
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s.storage = make([]byte, size)
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}
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@ -1089,9 +1087,6 @@ func encoderInitState(s *Writer) {
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s.hasher_.Common().is_prepared_ = false
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}
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s.cmd_code_numbits_ = 0
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s.next_out_ = nil
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s.available_out_ = 0
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s.total_out_ = 0
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s.stream_state_ = streamProcessing
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s.is_last_block_emitted_ = false
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s.is_initialized_ = false
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@ -1209,11 +1204,10 @@ func extendLastCommand(s *Writer, bytes *uint32, wrapped_last_processed_pos *uin
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}
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/*
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Processes the accumulated input data and sets |s.available_out_| to the length of
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the new output meta-block, or to zero if no new output meta-block has been
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created (in this case the processed input data is buffered internally).
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If |s.available_out_| is positive, |s.next_out_| points to the start of the output
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data. If |is_last| or |force_flush| is true, an output meta-block is
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Processes the accumulated input data and writes
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the new output meta-block to s.dest, if one has been
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created (otherwise the processed input data is buffered internally).
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If |is_last| or |force_flush| is true, an output meta-block is
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always created. However, until |is_last| is true encoder may retain up
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to 7 bits of the last byte of output. To force encoder to dump the remaining
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bits use WriteMetadata() to append an empty meta-data block.
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@ -1257,11 +1251,10 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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if delta == 0 && !is_last {
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/* We have no new input data and we don't have to finish the stream, so
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nothing to do. */
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s.available_out_ = 0
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return true
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}
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storage = getBrotliStorage(s, int(2*bytes+503))
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storage = s.getStorage(int(2*bytes + 503))
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storage[0] = byte(s.last_bytes_)
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storage[1] = byte(s.last_bytes_ >> 8)
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table = getHashTable(s, s.params.quality, uint(bytes), &table_size)
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@ -1274,8 +1267,7 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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s.last_bytes_ = uint16(storage[storage_ix>>3])
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s.last_bytes_bits_ = byte(storage_ix & 7)
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updateLastProcessedPos(s)
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s.next_out_ = storage[0:]
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s.available_out_ = storage_ix >> 3
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s.writeOutput(storage[:storage_ix>>3])
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return true
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}
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{
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@ -1334,7 +1326,6 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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hasherReset(s.hasher_)
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}
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s.available_out_ = 0
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return true
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}
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}
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@ -1350,8 +1341,6 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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if !is_last && s.input_pos_ == s.last_flush_pos_ {
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/* We have no new input data and we don't have to finish the stream, so
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nothing to do. */
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s.available_out_ = 0
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return true
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}
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@ -1360,7 +1349,7 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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assert(s.input_pos_-s.last_flush_pos_ <= 1<<24)
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{
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var metablock_size uint32 = uint32(s.input_pos_ - s.last_flush_pos_)
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var storage []byte = getBrotliStorage(s, int(2*metablock_size+503))
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var storage []byte = s.getStorage(int(2*metablock_size + 503))
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var storage_ix uint = uint(s.last_bytes_bits_)
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storage[0] = byte(s.last_bytes_)
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storage[1] = byte(s.last_bytes_ >> 8)
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@ -1387,8 +1376,7 @@ func encodeData(s *Writer, is_last bool, force_flush bool) bool {
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emitting an uncompressed block. */
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copy(s.saved_dist_cache_[:], s.dist_cache_[:])
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s.next_out_ = storage[0:]
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s.available_out_ = storage_ix >> 3
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s.writeOutput(storage[:storage_ix>>3])
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return true
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}
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}
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@ -1428,7 +1416,6 @@ func writeMetadataHeader(s *Writer, block_size uint, header []byte) uint {
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func injectBytePaddingBlock(s *Writer) {
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var seal uint32 = uint32(s.last_bytes_)
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var seal_bits uint = uint(s.last_bytes_bits_)
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var destination []byte
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s.last_bytes_ = 0
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s.last_bytes_bits_ = 0
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@ -1437,14 +1424,7 @@ func injectBytePaddingBlock(s *Writer) {
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seal_bits += 6
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/* If we have already created storage, then append to it.
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Storage is valid until next block is being compressed. */
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if s.next_out_ != nil {
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destination = s.next_out_[s.available_out_:]
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} else {
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destination = s.tiny_buf_.u8[:]
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s.next_out_ = destination
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}
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destination := s.tiny_buf_.u8[:]
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destination[0] = byte(seal)
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if seal_bits > 8 {
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@ -1453,13 +1433,12 @@ func injectBytePaddingBlock(s *Writer) {
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if seal_bits > 16 {
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destination[2] = byte(seal >> 16)
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}
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s.available_out_ += (seal_bits + 7) >> 3
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s.writeOutput(destination[:(seal_bits+7)>>3])
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}
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func checkFlushComplete(s *Writer) {
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if s.stream_state_ == streamFlushRequested && s.available_out_ == 0 {
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if s.stream_state_ == streamFlushRequested && s.err == nil {
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s.stream_state_ = streamProcessing
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s.next_out_ = nil
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}
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}
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@ -1497,10 +1476,10 @@ func encoderCompressStreamFast(s *Writer, op int, available_in *uint, next_in *[
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continue
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}
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/* Compress block only when internal output buffer is empty, stream is not
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/* Compress block only when stream is not
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finished, there is no pending flush request, and there is either
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additional input or pending operation. */
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if s.available_out_ == 0 && s.stream_state_ == streamProcessing && (*available_in != 0 || op != int(operationProcess)) {
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if s.stream_state_ == streamProcessing && (*available_in != 0 || op != int(operationProcess)) {
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var block_size uint = brotli_min_size_t(block_size_limit, *available_in)
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var is_last bool = (*available_in == block_size) && (op == int(operationFinish))
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var force_flush bool = (*available_in == block_size) && (op == int(operationFlush))
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@ -1515,7 +1494,7 @@ func encoderCompressStreamFast(s *Writer, op int, available_in *uint, next_in *[
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continue
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}
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storage = getBrotliStorage(s, int(max_out_size))
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storage = s.getStorage(int(max_out_size))
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storage[0] = byte(s.last_bytes_)
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storage[1] = byte(s.last_bytes_ >> 8)
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@ -1530,8 +1509,7 @@ func encoderCompressStreamFast(s *Writer, op int, available_in *uint, next_in *[
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*next_in = (*next_in)[block_size:]
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*available_in -= block_size
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var out_bytes uint = storage_ix >> 3
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s.next_out_ = storage
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s.available_out_ = out_bytes
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s.writeOutput(storage[:out_bytes])
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s.last_bytes_ = uint16(storage[storage_ix>>3])
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s.last_bytes_bits_ = byte(storage_ix & 7)
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@ -1575,10 +1553,6 @@ func processMetadata(s *Writer, available_in *uint, next_in *[]byte) bool {
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continue
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}
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if s.available_out_ != 0 {
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break
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}
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if s.input_pos_ != s.last_flush_pos_ {
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var result bool = encodeData(s, false, true)
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if !result {
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@ -1588,8 +1562,8 @@ func processMetadata(s *Writer, available_in *uint, next_in *[]byte) bool {
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}
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if s.stream_state_ == streamMetadataHead {
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s.next_out_ = s.tiny_buf_.u8[:]
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s.available_out_ = writeMetadataHeader(s, uint(s.remaining_metadata_bytes_), s.next_out_)
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n := writeMetadataHeader(s, uint(s.remaining_metadata_bytes_), s.tiny_buf_.u8[:])
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s.writeOutput(s.tiny_buf_.u8[:n])
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s.stream_state_ = streamMetadataBody
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continue
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} else {
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@ -1603,12 +1577,11 @@ func processMetadata(s *Writer, available_in *uint, next_in *[]byte) bool {
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/* This guarantees progress in "TakeOutput" workflow. */
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var c uint32 = brotli_min_uint32_t(s.remaining_metadata_bytes_, 16)
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s.next_out_ = s.tiny_buf_.u8[:]
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copy(s.next_out_, (*next_in)[:c])
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copy(s.tiny_buf_.u8[:], (*next_in)[:c])
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*next_in = (*next_in)[c:]
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*available_in -= uint(c)
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s.remaining_metadata_bytes_ -= c
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s.available_out_ = uint(c)
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s.writeOutput(s.tiny_buf_.u8[:c])
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continue
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}
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@ -1681,9 +1654,9 @@ func encoderCompressStream(s *Writer, op int, available_in *uint, next_in *[]byt
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continue
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}
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/* Compress data only when internal output buffer is empty, stream is not
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/* Compress data only when stream is not
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finished and there is no pending flush request. */
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if s.available_out_ == 0 && s.stream_state_ == streamProcessing {
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if s.stream_state_ == streamProcessing {
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if remaining_block_size == 0 || op != int(operationProcess) {
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var is_last bool = ((*available_in == 0) && op == int(operationFinish))
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var force_flush bool = ((*available_in == 0) && op == int(operationFlush))
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@ -1710,18 +1683,13 @@ func encoderCompressStream(s *Writer, op int, available_in *uint, next_in *[]byt
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return true
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}
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func encoderHasMoreOutput(s *Writer) bool {
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return s.available_out_ != 0
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}
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func encoderTakeOutput(s *Writer) []byte {
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if s.available_out_ == 0 {
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return nil
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func (w *Writer) writeOutput(data []byte) {
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if w.err != nil {
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return
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}
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result := s.next_out_[:s.available_out_]
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s.total_out_ += s.available_out_
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s.available_out_ = 0
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checkFlushComplete(s)
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return result
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_, w.err = w.dst.Write(data)
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if w.err == nil {
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checkFlushComplete(w)
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}
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}
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15
writer.go
15
writer.go
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@ -67,6 +67,9 @@ func (w *Writer) writeChunk(p []byte, op int) (n int, err error) {
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if w.dst == nil {
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return 0, errWriterClosed
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}
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if w.err != nil {
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return 0, w.err
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}
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for {
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availableIn := uint(len(p))
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@ -79,16 +82,8 @@ func (w *Writer) writeChunk(p []byte, op int) (n int, err error) {
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return n, errEncode
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}
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outputData := encoderTakeOutput(w)
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if len(outputData) > 0 {
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_, err = w.dst.Write(outputData)
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if err != nil {
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return n, err
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}
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}
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if len(p) == 0 {
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return n, nil
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if len(p) == 0 || w.err != nil {
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return n, w.err
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}
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}
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}
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