forked from mirror/brotli
Make BrotliDecoderState into a Reader.
This commit is contained in:
Andy Balholm
parent
f036cd04c1
commit
0da14edee1
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@ -0,0 +1,396 @@
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// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Distributed under MIT license.
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// See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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package brotli
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"math"
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"math/rand"
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"testing"
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"time"
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)
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func checkCompressedData(compressedData, wantOriginalData []byte) error {
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uncompressed, err := Decode(compressedData)
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if err != nil {
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return fmt.Errorf("brotli decompress failed: %v", err)
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}
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if !bytes.Equal(uncompressed, wantOriginalData) {
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if len(wantOriginalData) != len(uncompressed) {
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return fmt.Errorf(""+
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"Data doesn't uncompress to the original value.\n"+
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"Length of original: %v\n"+
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"Length of uncompressed: %v",
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len(wantOriginalData), len(uncompressed))
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}
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for i := range wantOriginalData {
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if wantOriginalData[i] != uncompressed[i] {
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return fmt.Errorf(""+
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"Data doesn't uncompress to the original value.\n"+
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"Original at %v is %v\n"+
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"Uncompressed at %v is %v",
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i, wantOriginalData[i], i, uncompressed[i])
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}
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}
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}
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return nil
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}
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func TestEncoderNoWrite(t *testing.T) {
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 5})
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if err := e.Close(); err != nil {
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t.Errorf("Close()=%v, want nil", err)
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}
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// Check Write after close.
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if _, err := e.Write([]byte("hi")); err == nil {
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t.Errorf("No error after Close() + Write()")
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}
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}
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func TestEncoderEmptyWrite(t *testing.T) {
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 5})
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n, err := e.Write([]byte(""))
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if n != 0 || err != nil {
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t.Errorf("Write()=%v,%v, want 0, nil", n, err)
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}
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if err := e.Close(); err != nil {
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t.Errorf("Close()=%v, want nil", err)
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}
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}
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func TestWriter(t *testing.T) {
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// Test basic encoder usage.
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input := []byte("<html><body><H1>Hello world</H1></body></html>")
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 1})
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in := bytes.NewReader([]byte(input))
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n, err := io.Copy(e, in)
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if err != nil {
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t.Errorf("Copy Error: %v", err)
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}
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if int(n) != len(input) {
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t.Errorf("Copy() n=%v, want %v", n, len(input))
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}
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if err := e.Close(); err != nil {
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t.Errorf("Close Error after copied %d bytes: %v", n, err)
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}
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if err := checkCompressedData(out.Bytes(), input); err != nil {
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t.Error(err)
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}
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}
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func TestEncoderStreams(t *testing.T) {
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// Test that output is streamed.
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// Adjust window size to ensure the encoder outputs at least enough bytes
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// to fill the window.
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const lgWin = 16
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windowSize := int(math.Pow(2, lgWin))
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input := make([]byte, 8*windowSize)
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rand.Read(input)
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 11, LGWin: lgWin})
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halfInput := input[:len(input)/2]
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in := bytes.NewReader(halfInput)
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n, err := io.Copy(e, in)
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if err != nil {
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t.Errorf("Copy Error: %v", err)
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}
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// We've fed more data than the sliding window size. Check that some
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// compressed data has been output.
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if out.Len() == 0 {
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t.Errorf("Output length is 0 after %d bytes written", n)
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}
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if err := e.Close(); err != nil {
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t.Errorf("Close Error after copied %d bytes: %v", n, err)
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}
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if err := checkCompressedData(out.Bytes(), halfInput); err != nil {
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t.Error(err)
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}
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}
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func TestEncoderLargeInput(t *testing.T) {
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input := make([]byte, 1000000)
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rand.Read(input)
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 5})
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in := bytes.NewReader(input)
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n, err := io.Copy(e, in)
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if err != nil {
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t.Errorf("Copy Error: %v", err)
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}
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if int(n) != len(input) {
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t.Errorf("Copy() n=%v, want %v", n, len(input))
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}
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if err := e.Close(); err != nil {
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t.Errorf("Close Error after copied %d bytes: %v", n, err)
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}
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if err := checkCompressedData(out.Bytes(), input); err != nil {
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t.Error(err)
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}
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}
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func TestEncoderFlush(t *testing.T) {
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input := make([]byte, 1000)
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rand.Read(input)
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out := bytes.Buffer{}
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e := NewWriter(&out, WriterOptions{Quality: 5})
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in := bytes.NewReader(input)
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_, err := io.Copy(e, in)
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if err != nil {
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t.Fatalf("Copy Error: %v", err)
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}
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if err := e.Flush(); err != nil {
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t.Fatalf("Flush(): %v", err)
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}
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if out.Len() == 0 {
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t.Fatalf("0 bytes written after Flush()")
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}
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decompressed := make([]byte, 1000)
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reader := NewReader(bytes.NewReader(out.Bytes()))
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n, err := reader.Read(decompressed)
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if n != len(decompressed) || err != nil {
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t.Errorf("Expected <%v, nil>, but <%v, %v>", len(decompressed), n, err)
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}
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if !bytes.Equal(decompressed, input) {
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t.Errorf(""+
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"Decompress after flush: %v\n"+
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"%q\n"+
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"want:\n%q",
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err, decompressed, input)
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}
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if err := e.Close(); err != nil {
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t.Errorf("Close(): %v", err)
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}
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}
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type readerWithTimeout struct {
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io.Reader
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}
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func (r readerWithTimeout) Read(p []byte) (int, error) {
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type result struct {
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n int
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err error
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}
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ch := make(chan result)
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go func() {
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n, err := r.Reader.Read(p)
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ch <- result{n, err}
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}()
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select {
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case result := <-ch:
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return result.n, result.err
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case <-time.After(5 * time.Second):
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return 0, fmt.Errorf("read timed out")
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}
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}
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func TestDecoderStreaming(t *testing.T) {
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pr, pw := io.Pipe()
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writer := NewWriter(pw, WriterOptions{Quality: 5, LGWin: 20})
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reader := readerWithTimeout{NewReader(pr)}
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defer func() {
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go ioutil.ReadAll(pr) // swallow the "EOF" token from writer.Close
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if err := writer.Close(); err != nil {
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t.Errorf("writer.Close: %v", err)
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}
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}()
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ch := make(chan []byte)
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errch := make(chan error)
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go func() {
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for {
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segment, ok := <-ch
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if !ok {
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return
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}
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if n, err := writer.Write(segment); err != nil || n != len(segment) {
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errch <- fmt.Errorf("write=%v,%v, want %v,%v", n, err, len(segment), nil)
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return
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}
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if err := writer.Flush(); err != nil {
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errch <- fmt.Errorf("flush: %v", err)
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return
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}
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}
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}()
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defer close(ch)
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segments := [...][]byte{
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[]byte("first"),
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[]byte("second"),
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[]byte("third"),
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}
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for k, segment := range segments {
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t.Run(fmt.Sprintf("Segment%d", k), func(t *testing.T) {
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select {
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case ch <- segment:
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case err := <-errch:
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t.Fatalf("write: %v", err)
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case <-time.After(5 * time.Second):
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t.Fatalf("timed out")
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}
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wantLen := len(segment)
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got := make([]byte, wantLen)
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if n, err := reader.Read(got); err != nil || n != wantLen || !bytes.Equal(got, segment) {
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t.Fatalf("read[%d]=%q,%v,%v, want %q,%v,%v", k, got, n, err, segment, wantLen, nil)
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}
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})
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}
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}
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func TestReader(t *testing.T) {
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content := bytes.Repeat([]byte("hello world!"), 10000)
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encoded, _ := Encode(content, WriterOptions{Quality: 5})
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r := NewReader(bytes.NewReader(encoded))
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var decodedOutput bytes.Buffer
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n, err := io.Copy(&decodedOutput, r)
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if err != nil {
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t.Fatalf("Copy(): n=%v, err=%v", n, err)
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}
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if got := decodedOutput.Bytes(); !bytes.Equal(got, content) {
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t.Errorf(""+
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"Reader output:\n"+
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"%q\n"+
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"want:\n"+
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"<%d bytes>",
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got, len(content))
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}
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}
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func TestDecode(t *testing.T) {
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content := bytes.Repeat([]byte("hello world!"), 10000)
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encoded, _ := Encode(content, WriterOptions{Quality: 5})
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decoded, err := Decode(encoded)
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if err != nil {
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t.Errorf("Decode: %v", err)
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}
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if !bytes.Equal(decoded, content) {
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t.Errorf(""+
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"Decode content:\n"+
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"%q\n"+
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"want:\n"+
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"<%d bytes>",
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decoded, len(content))
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}
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}
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func TestQuality(t *testing.T) {
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content := bytes.Repeat([]byte("hello world!"), 10000)
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for q := 0; q < 12; q++ {
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encoded, _ := Encode(content, WriterOptions{Quality: q})
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decoded, err := Decode(encoded)
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if err != nil {
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t.Errorf("Decode: %v", err)
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}
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if !bytes.Equal(decoded, content) {
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t.Errorf(""+
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"Decode content:\n"+
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"%q\n"+
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"want:\n"+
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"<%d bytes>",
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decoded, len(content))
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}
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}
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}
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func TestDecodeFuzz(t *testing.T) {
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// Test that the decoder terminates with corrupted input.
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content := bytes.Repeat([]byte("hello world!"), 100)
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src := rand.NewSource(0)
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encoded, err := Encode(content, WriterOptions{Quality: 5})
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if err != nil {
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t.Fatalf("Encode(<%d bytes>, _) = _, %s", len(content), err)
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}
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if len(encoded) == 0 {
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t.Fatalf("Encode(<%d bytes>, _) produced empty output", len(content))
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}
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for i := 0; i < 100; i++ {
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enc := append([]byte{}, encoded...)
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for j := 0; j < 5; j++ {
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enc[int(src.Int63())%len(enc)] = byte(src.Int63() % 256)
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}
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Decode(enc)
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}
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}
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func TestDecodeTrailingData(t *testing.T) {
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content := bytes.Repeat([]byte("hello world!"), 100)
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encoded, _ := Encode(content, WriterOptions{Quality: 5})
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_, err := Decode(append(encoded, 0))
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if err == nil {
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t.Errorf("Expected 'excessive input' error")
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}
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}
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func TestEncodeDecode(t *testing.T) {
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for _, test := range []struct {
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data []byte
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repeats int
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}{
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{nil, 0},
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{[]byte("A"), 1},
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{[]byte("<html><body><H1>Hello world</H1></body></html>"), 10},
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{[]byte("<html><body><H1>Hello world</H1></body></html>"), 1000},
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} {
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t.Logf("case %q x %d", test.data, test.repeats)
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input := bytes.Repeat(test.data, test.repeats)
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encoded, err := Encode(input, WriterOptions{Quality: 5})
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if err != nil {
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t.Errorf("Encode: %v", err)
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}
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// Inputs are compressible, but may be too small to compress.
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if maxSize := len(input)/2 + 20; len(encoded) >= maxSize {
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t.Errorf(""+
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"Encode returned %d bytes, want <%d\n"+
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"Encoded=%q",
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len(encoded), maxSize, encoded)
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}
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decoded, err := Decode(encoded)
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if err != nil {
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t.Errorf("Decode: %v", err)
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}
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if !bytes.Equal(decoded, input) {
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var want string
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if len(input) > 320 {
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want = fmt.Sprintf("<%d bytes>", len(input))
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} else {
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want = fmt.Sprintf("%q", input)
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}
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t.Errorf(""+
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"Decode content:\n"+
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"%q\n"+
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"want:\n"+
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"%s",
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decoded, want)
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}
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}
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}
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// Encode returns content encoded with Brotli.
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func Encode(content []byte, options WriterOptions) ([]byte, error) {
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var buf bytes.Buffer
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writer := NewWriter(&buf, options)
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_, err := writer.Write(content)
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if closeErr := writer.Close(); err == nil {
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err = closeErr
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}
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return buf.Bytes(), err
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}
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// Decode decodes Brotli encoded data.
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func Decode(encodedData []byte) ([]byte, error) {
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r := NewReader(bytes.NewReader(encodedData))
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return ioutil.ReadAll(r)
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}
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108
decode.go
108
decode.go
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@ -114,7 +114,7 @@ var kCodeLengthPrefixLength = [16]byte{2, 2, 2, 3, 2, 2, 2, 4, 2, 2, 2, 3, 2, 2,
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var kCodeLengthPrefixValue = [16]byte{0, 4, 3, 2, 0, 4, 3, 1, 0, 4, 3, 2, 0, 4, 3, 5}
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func BrotliDecoderSetParameter(state *BrotliDecoderState, p int, value uint32) bool {
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func BrotliDecoderSetParameter(state *Reader, p int, value uint32) bool {
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if state.state != BROTLI_STATE_UNINITED {
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return false
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}
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@ -136,9 +136,9 @@ func BrotliDecoderSetParameter(state *BrotliDecoderState, p int, value uint32) b
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}
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}
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func BrotliDecoderCreateInstance() *BrotliDecoderState {
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var state *BrotliDecoderState
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state = new(BrotliDecoderState)
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func BrotliDecoderCreateInstance() *Reader {
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var state *Reader
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state = new(Reader)
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if state == nil {
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return nil
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}
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@ -151,7 +151,7 @@ func BrotliDecoderCreateInstance() *BrotliDecoderState {
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}
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/* Deinitializes and frees BrotliDecoderState instance. */
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func BrotliDecoderDestroyInstance(state *BrotliDecoderState) {
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func BrotliDecoderDestroyInstance(state *Reader) {
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if state == nil {
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return
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} else {
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@ -160,7 +160,7 @@ func BrotliDecoderDestroyInstance(state *BrotliDecoderState) {
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}
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/* Saves error code and converts it to BrotliDecoderResult. */
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func SaveErrorCode(s *BrotliDecoderState, e int) int {
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func SaveErrorCode(s *Reader, e int) int {
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s.error_code = int(e)
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switch e {
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case BROTLI_DECODER_SUCCESS:
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@ -179,7 +179,7 @@ func SaveErrorCode(s *BrotliDecoderState, e int) int {
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/* Decodes WBITS by reading 1 - 7 bits, or 0x11 for "Large Window Brotli".
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Precondition: bit-reader accumulator has at least 8 bits. */
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func DecodeWindowBits(s *BrotliDecoderState, br *BrotliBitReader) int {
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func DecodeWindowBits(s *Reader, br *BrotliBitReader) int {
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var n uint32
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var large_window bool = s.large_window
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s.large_window = false
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@ -220,7 +220,7 @@ func DecodeWindowBits(s *BrotliDecoderState, br *BrotliBitReader) int {
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}
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/* Decodes a number in the range [0..255], by reading 1 - 11 bits. */
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func DecodeVarLenUint8(s *BrotliDecoderState, br *BrotliBitReader, value *uint32) int {
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func DecodeVarLenUint8(s *Reader, br *BrotliBitReader, value *uint32) int {
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var bits uint32
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switch s.substate_decode_uint8 {
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case BROTLI_STATE_DECODE_UINT8_NONE:
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@ -268,7 +268,7 @@ func DecodeVarLenUint8(s *BrotliDecoderState, br *BrotliBitReader, value *uint32
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}
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/* Decodes a metablock length and flags by reading 2 - 31 bits. */
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func DecodeMetaBlockLength(s *BrotliDecoderState, br *BrotliBitReader) int {
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func DecodeMetaBlockLength(s *Reader, br *BrotliBitReader) int {
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var bits uint32
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var i int
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for {
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@ -538,7 +538,7 @@ func Log2Floor(x uint32) uint32 {
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|||
/* Reads (s->symbol + 1) symbols.
|
||||
Totally 1..4 symbols are read, 1..11 bits each.
|
||||
The list of symbols MUST NOT contain duplicates. */
|
||||
func ReadSimpleHuffmanSymbols(alphabet_size uint32, max_symbol uint32, s *BrotliDecoderState) int {
|
||||
func ReadSimpleHuffmanSymbols(alphabet_size uint32, max_symbol uint32, s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var max_bits uint32 = Log2Floor(alphabet_size - 1)
|
||||
var i uint32 = s.sub_loop_counter
|
||||
|
|
@ -651,7 +651,7 @@ func ProcessRepeatedCodeLength(code_len uint32, repeat_delta uint32, alphabet_si
|
|||
}
|
||||
|
||||
/* Reads and decodes symbol codelengths. */
|
||||
func ReadSymbolCodeLengths(alphabet_size uint32, s *BrotliDecoderState) int {
|
||||
func ReadSymbolCodeLengths(alphabet_size uint32, s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var symbol uint32 = s.symbol
|
||||
var repeat uint32 = s.repeat
|
||||
|
|
@ -700,7 +700,7 @@ func ReadSymbolCodeLengths(alphabet_size uint32, s *BrotliDecoderState) int {
|
|||
return BROTLI_DECODER_SUCCESS
|
||||
}
|
||||
|
||||
func SafeReadSymbolCodeLengths(alphabet_size uint32, s *BrotliDecoderState) int {
|
||||
func SafeReadSymbolCodeLengths(alphabet_size uint32, s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var get_byte bool = false
|
||||
var p []HuffmanCode
|
||||
|
|
@ -746,7 +746,7 @@ func SafeReadSymbolCodeLengths(alphabet_size uint32, s *BrotliDecoderState) int
|
|||
|
||||
/* Reads and decodes 15..18 codes using static prefix code.
|
||||
Each code is 2..4 bits long. In total 30..72 bits are used. */
|
||||
func ReadCodeLengthCodeLengths(s *BrotliDecoderState) int {
|
||||
func ReadCodeLengthCodeLengths(s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var num_codes uint32 = s.repeat
|
||||
var space uint32 = s.space
|
||||
|
|
@ -804,7 +804,7 @@ func ReadCodeLengthCodeLengths(s *BrotliDecoderState) int {
|
|||
encoded with predefined entropy code. 32 - 74 bits are used.
|
||||
B.2) Decoded table is used to decode code lengths of symbols in resulting
|
||||
Huffman table. In worst case 3520 bits are read. */
|
||||
func ReadHuffmanCode(alphabet_size uint32, max_symbol uint32, table []HuffmanCode, opt_table_size *uint32, s *BrotliDecoderState) int {
|
||||
func ReadHuffmanCode(alphabet_size uint32, max_symbol uint32, table []HuffmanCode, opt_table_size *uint32, s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
|
||||
/* Unnecessary masking, but might be good for safety. */
|
||||
|
|
@ -954,7 +954,7 @@ func ReadBlockLength(table []HuffmanCode, br *BrotliBitReader) uint32 {
|
|||
|
||||
/* WARNING: if state is not BROTLI_STATE_READ_BLOCK_LENGTH_NONE, then
|
||||
reading can't be continued with ReadBlockLength. */
|
||||
func SafeReadBlockLength(s *BrotliDecoderState, result *uint32, table []HuffmanCode, br *BrotliBitReader) bool {
|
||||
func SafeReadBlockLength(s *Reader, result *uint32, table []HuffmanCode, br *BrotliBitReader) bool {
|
||||
var index uint32
|
||||
if s.substate_read_block_length == BROTLI_STATE_READ_BLOCK_LENGTH_NONE {
|
||||
if !SafeReadSymbol(table, br, &index) {
|
||||
|
|
@ -992,7 +992,7 @@ func SafeReadBlockLength(s *BrotliDecoderState, result *uint32, table []HuffmanC
|
|||
|
||||
Most of input values are 0 and 1. To reduce number of branches, we replace
|
||||
inner for loop with do-while. */
|
||||
func InverseMoveToFrontTransform(v []byte, v_len uint32, state *BrotliDecoderState) {
|
||||
func InverseMoveToFrontTransform(v []byte, v_len uint32, state *Reader) {
|
||||
var mtf [256]byte
|
||||
var i int
|
||||
for i = 1; i < 256; i++ {
|
||||
|
|
@ -1016,7 +1016,7 @@ func InverseMoveToFrontTransform(v []byte, v_len uint32, state *BrotliDecoderSta
|
|||
}
|
||||
|
||||
/* Decodes a series of Huffman table using ReadHuffmanCode function. */
|
||||
func HuffmanTreeGroupDecode(group *HuffmanTreeGroup, s *BrotliDecoderState) int {
|
||||
func HuffmanTreeGroupDecode(group *HuffmanTreeGroup, s *Reader) int {
|
||||
if s.substate_tree_group != BROTLI_STATE_TREE_GROUP_LOOP {
|
||||
s.next = group.codes
|
||||
s.htree_index = 0
|
||||
|
|
@ -1046,7 +1046,7 @@ func HuffmanTreeGroupDecode(group *HuffmanTreeGroup, s *BrotliDecoderState) int
|
|||
This table will be used for reading context map items.
|
||||
3) Read context map items; "0" values could be run-length encoded.
|
||||
4) Optionally, apply InverseMoveToFront transform to the resulting map. */
|
||||
func DecodeContextMap(context_map_size uint32, num_htrees *uint32, context_map_arg *[]byte, s *BrotliDecoderState) int {
|
||||
func DecodeContextMap(context_map_size uint32, num_htrees *uint32, context_map_arg *[]byte, s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var result int = BROTLI_DECODER_SUCCESS
|
||||
|
||||
|
|
@ -1192,7 +1192,7 @@ func DecodeContextMap(context_map_size uint32, num_htrees *uint32, context_map_a
|
|||
|
||||
/* Decodes a command or literal and updates block type ring-buffer.
|
||||
Reads 3..54 bits. */
|
||||
func DecodeBlockTypeAndLength(safe int, s *BrotliDecoderState, tree_type int) bool {
|
||||
func DecodeBlockTypeAndLength(safe int, s *Reader, tree_type int) bool {
|
||||
var max_block_type uint32 = s.num_block_types[tree_type]
|
||||
var type_tree []HuffmanCode
|
||||
type_tree = s.block_type_trees[tree_type*BROTLI_HUFFMAN_MAX_SIZE_258:]
|
||||
|
|
@ -1239,7 +1239,7 @@ func DecodeBlockTypeAndLength(safe int, s *BrotliDecoderState, tree_type int) bo
|
|||
return true
|
||||
}
|
||||
|
||||
func DetectTrivialLiteralBlockTypes(s *BrotliDecoderState) {
|
||||
func DetectTrivialLiteralBlockTypes(s *Reader) {
|
||||
var i uint
|
||||
for i = 0; i < 8; i++ {
|
||||
s.trivial_literal_contexts[i] = 0
|
||||
|
|
@ -1263,7 +1263,7 @@ func DetectTrivialLiteralBlockTypes(s *BrotliDecoderState) {
|
|||
}
|
||||
}
|
||||
|
||||
func PrepareLiteralDecoding(s *BrotliDecoderState) {
|
||||
func PrepareLiteralDecoding(s *Reader) {
|
||||
var context_mode byte
|
||||
var trivial uint
|
||||
var block_type uint32 = s.block_type_rb[1]
|
||||
|
|
@ -1278,7 +1278,7 @@ func PrepareLiteralDecoding(s *BrotliDecoderState) {
|
|||
|
||||
/* Decodes the block type and updates the state for literal context.
|
||||
Reads 3..54 bits. */
|
||||
func DecodeLiteralBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
||||
func DecodeLiteralBlockSwitchInternal(safe int, s *Reader) bool {
|
||||
if !DecodeBlockTypeAndLength(safe, s, 0) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -1287,17 +1287,17 @@ func DecodeLiteralBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
|||
return true
|
||||
}
|
||||
|
||||
func DecodeLiteralBlockSwitch(s *BrotliDecoderState) {
|
||||
func DecodeLiteralBlockSwitch(s *Reader) {
|
||||
DecodeLiteralBlockSwitchInternal(0, s)
|
||||
}
|
||||
|
||||
func SafeDecodeLiteralBlockSwitch(s *BrotliDecoderState) bool {
|
||||
func SafeDecodeLiteralBlockSwitch(s *Reader) bool {
|
||||
return DecodeLiteralBlockSwitchInternal(1, s)
|
||||
}
|
||||
|
||||
/* Block switch for insert/copy length.
|
||||
Reads 3..54 bits. */
|
||||
func DecodeCommandBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
||||
func DecodeCommandBlockSwitchInternal(safe int, s *Reader) bool {
|
||||
if !DecodeBlockTypeAndLength(safe, s, 1) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -1306,17 +1306,17 @@ func DecodeCommandBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
|||
return true
|
||||
}
|
||||
|
||||
func DecodeCommandBlockSwitch(s *BrotliDecoderState) {
|
||||
func DecodeCommandBlockSwitch(s *Reader) {
|
||||
DecodeCommandBlockSwitchInternal(0, s)
|
||||
}
|
||||
|
||||
func SafeDecodeCommandBlockSwitch(s *BrotliDecoderState) bool {
|
||||
func SafeDecodeCommandBlockSwitch(s *Reader) bool {
|
||||
return DecodeCommandBlockSwitchInternal(1, s)
|
||||
}
|
||||
|
||||
/* Block switch for distance codes.
|
||||
Reads 3..54 bits. */
|
||||
func DecodeDistanceBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
||||
func DecodeDistanceBlockSwitchInternal(safe int, s *Reader) bool {
|
||||
if !DecodeBlockTypeAndLength(safe, s, 2) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -1326,15 +1326,15 @@ func DecodeDistanceBlockSwitchInternal(safe int, s *BrotliDecoderState) bool {
|
|||
return true
|
||||
}
|
||||
|
||||
func DecodeDistanceBlockSwitch(s *BrotliDecoderState) {
|
||||
func DecodeDistanceBlockSwitch(s *Reader) {
|
||||
DecodeDistanceBlockSwitchInternal(0, s)
|
||||
}
|
||||
|
||||
func SafeDecodeDistanceBlockSwitch(s *BrotliDecoderState) bool {
|
||||
func SafeDecodeDistanceBlockSwitch(s *Reader) bool {
|
||||
return DecodeDistanceBlockSwitchInternal(1, s)
|
||||
}
|
||||
|
||||
func UnwrittenBytes(s *BrotliDecoderState, wrap bool) uint {
|
||||
func UnwrittenBytes(s *Reader, wrap bool) uint {
|
||||
var pos uint
|
||||
if wrap && s.pos > s.ringbuffer_size {
|
||||
pos = uint(s.ringbuffer_size)
|
||||
|
|
@ -1348,7 +1348,7 @@ func UnwrittenBytes(s *BrotliDecoderState, wrap bool) uint {
|
|||
/* Dumps output.
|
||||
Returns BROTLI_DECODER_NEEDS_MORE_OUTPUT only if there is more output to push
|
||||
and either ring-buffer is as big as window size, or |force| is true. */
|
||||
func WriteRingBuffer(s *BrotliDecoderState, available_out *uint, next_out *[]byte, total_out *uint, force bool) int {
|
||||
func WriteRingBuffer(s *Reader, available_out *uint, next_out *[]byte, total_out *uint, force bool) int {
|
||||
var start []byte
|
||||
start = s.ringbuffer[s.partial_pos_out&uint(s.ringbuffer_mask):]
|
||||
var to_write uint = UnwrittenBytes(s, true)
|
||||
|
|
@ -1398,7 +1398,7 @@ func WriteRingBuffer(s *BrotliDecoderState, available_out *uint, next_out *[]byt
|
|||
return BROTLI_DECODER_SUCCESS
|
||||
}
|
||||
|
||||
func WrapRingBuffer(s *BrotliDecoderState) {
|
||||
func WrapRingBuffer(s *Reader) {
|
||||
if s.should_wrap_ringbuffer != 0 {
|
||||
copy(s.ringbuffer, s.ringbuffer_end[:uint(s.pos)])
|
||||
s.should_wrap_ringbuffer = 0
|
||||
|
|
@ -1412,7 +1412,7 @@ func WrapRingBuffer(s *BrotliDecoderState) {
|
|||
|
||||
Last two bytes of ring-buffer are initialized to 0, so context calculation
|
||||
could be done uniformly for the first two and all other positions. */
|
||||
func BrotliEnsureRingBuffer(s *BrotliDecoderState) bool {
|
||||
func BrotliEnsureRingBuffer(s *Reader) bool {
|
||||
var old_ringbuffer []byte = s.ringbuffer
|
||||
if s.ringbuffer_size == s.new_ringbuffer_size {
|
||||
return true
|
||||
|
|
@ -1442,7 +1442,7 @@ func BrotliEnsureRingBuffer(s *BrotliDecoderState) bool {
|
|||
return true
|
||||
}
|
||||
|
||||
func CopyUncompressedBlockToOutput(available_out *uint, next_out *[]byte, total_out *uint, s *BrotliDecoderState) int {
|
||||
func CopyUncompressedBlockToOutput(available_out *uint, next_out *[]byte, total_out *uint, s *Reader) int {
|
||||
/* TODO: avoid allocation for single uncompressed block. */
|
||||
if !BrotliEnsureRingBuffer(s) {
|
||||
return BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_1
|
||||
|
|
@ -1508,7 +1508,7 @@ func CopyUncompressedBlockToOutput(available_out *uint, next_out *[]byte, total_
|
|||
size than needed to reduce memory usage.
|
||||
|
||||
When this method is called, metablock size and flags MUST be decoded. */
|
||||
func BrotliCalculateRingBufferSize(s *BrotliDecoderState) {
|
||||
func BrotliCalculateRingBufferSize(s *Reader) {
|
||||
var window_size int = 1 << s.window_bits
|
||||
var new_ringbuffer_size int = window_size
|
||||
var min_size int
|
||||
|
|
@ -1557,7 +1557,7 @@ func BrotliCalculateRingBufferSize(s *BrotliDecoderState) {
|
|||
}
|
||||
|
||||
/* Reads 1..256 2-bit context modes. */
|
||||
func ReadContextModes(s *BrotliDecoderState) int {
|
||||
func ReadContextModes(s *Reader) int {
|
||||
var br *BrotliBitReader = &s.br
|
||||
var i int = s.loop_counter
|
||||
|
||||
|
|
@ -1575,7 +1575,7 @@ func ReadContextModes(s *BrotliDecoderState) int {
|
|||
return BROTLI_DECODER_SUCCESS
|
||||
}
|
||||
|
||||
func TakeDistanceFromRingBuffer(s *BrotliDecoderState) {
|
||||
func TakeDistanceFromRingBuffer(s *Reader) {
|
||||
if s.distance_code == 0 {
|
||||
s.dist_rb_idx--
|
||||
s.distance_code = s.dist_rb[s.dist_rb_idx&3]
|
||||
|
|
@ -1618,7 +1618,7 @@ func SafeReadBits(br *BrotliBitReader, n_bits uint32, val *uint32) bool {
|
|||
}
|
||||
|
||||
/* Precondition: s->distance_code < 0. */
|
||||
func ReadDistanceInternal(safe int, s *BrotliDecoderState, br *BrotliBitReader) bool {
|
||||
func ReadDistanceInternal(safe int, s *Reader, br *BrotliBitReader) bool {
|
||||
var distval int
|
||||
var memento BrotliBitReaderState
|
||||
var distance_tree []HuffmanCode = []HuffmanCode(s.distance_hgroup.htrees[s.dist_htree_index])
|
||||
|
|
@ -1679,15 +1679,15 @@ func ReadDistanceInternal(safe int, s *BrotliDecoderState, br *BrotliBitReader)
|
|||
return true
|
||||
}
|
||||
|
||||
func ReadDistance(s *BrotliDecoderState, br *BrotliBitReader) {
|
||||
func ReadDistance(s *Reader, br *BrotliBitReader) {
|
||||
ReadDistanceInternal(0, s, br)
|
||||
}
|
||||
|
||||
func SafeReadDistance(s *BrotliDecoderState, br *BrotliBitReader) bool {
|
||||
func SafeReadDistance(s *Reader, br *BrotliBitReader) bool {
|
||||
return ReadDistanceInternal(1, s, br)
|
||||
}
|
||||
|
||||
func ReadCommandInternal(safe int, s *BrotliDecoderState, br *BrotliBitReader, insert_length *int) bool {
|
||||
func ReadCommandInternal(safe int, s *Reader, br *BrotliBitReader, insert_length *int) bool {
|
||||
var cmd_code uint32
|
||||
var insert_len_extra uint32 = 0
|
||||
var copy_length uint32
|
||||
|
|
@ -1726,11 +1726,11 @@ func ReadCommandInternal(safe int, s *BrotliDecoderState, br *BrotliBitReader, i
|
|||
return true
|
||||
}
|
||||
|
||||
func ReadCommand(s *BrotliDecoderState, br *BrotliBitReader, insert_length *int) {
|
||||
func ReadCommand(s *Reader, br *BrotliBitReader, insert_length *int) {
|
||||
ReadCommandInternal(0, s, br, insert_length)
|
||||
}
|
||||
|
||||
func SafeReadCommand(s *BrotliDecoderState, br *BrotliBitReader, insert_length *int) bool {
|
||||
func SafeReadCommand(s *Reader, br *BrotliBitReader, insert_length *int) bool {
|
||||
return ReadCommandInternal(1, s, br, insert_length)
|
||||
}
|
||||
|
||||
|
|
@ -1742,7 +1742,7 @@ func CheckInputAmount(safe int, br *BrotliBitReader, num uint) bool {
|
|||
return BrotliCheckInputAmount(br, num)
|
||||
}
|
||||
|
||||
func ProcessCommandsInternal(safe int, s *BrotliDecoderState) int {
|
||||
func ProcessCommandsInternal(safe int, s *Reader) int {
|
||||
var pos int = s.pos
|
||||
var i int = s.loop_counter
|
||||
var result int = BROTLI_DECODER_SUCCESS
|
||||
|
|
@ -2110,11 +2110,11 @@ saveStateAndReturn:
|
|||
return result
|
||||
}
|
||||
|
||||
func ProcessCommands(s *BrotliDecoderState) int {
|
||||
func ProcessCommands(s *Reader) int {
|
||||
return ProcessCommandsInternal(0, s)
|
||||
}
|
||||
|
||||
func SafeProcessCommands(s *BrotliDecoderState) int {
|
||||
func SafeProcessCommands(s *Reader) int {
|
||||
return ProcessCommandsInternal(1, s)
|
||||
}
|
||||
|
||||
|
|
@ -2136,7 +2136,7 @@ func BrotliMaxDistanceSymbol(ndirect uint32, npostfix uint32) uint32 {
|
|||
}
|
||||
|
||||
func BrotliDecoderDecompress(encoded_size uint, encoded_buffer []byte, decoded_size *uint, decoded_buffer []byte) int {
|
||||
var s BrotliDecoderState
|
||||
var s Reader
|
||||
var result int
|
||||
var total_out uint = 0
|
||||
var available_in uint = encoded_size
|
||||
|
|
@ -2168,7 +2168,7 @@ func BrotliDecoderDecompress(encoded_size uint, encoded_buffer []byte, decoded_s
|
|||
buffer ahead of time
|
||||
- when result is "success" decoder MUST return all unused data back to input
|
||||
buffer; this is possible because the invariant is held on enter */
|
||||
func BrotliDecoderDecompressStream(s *BrotliDecoderState, available_in *uint, next_in *[]byte, available_out *uint, next_out *[]byte, total_out *uint) int {
|
||||
func BrotliDecoderDecompressStream(s *Reader, available_in *uint, next_in *[]byte, available_out *uint, next_out *[]byte, total_out *uint) int {
|
||||
var result int = BROTLI_DECODER_SUCCESS
|
||||
var br *BrotliBitReader = &s.br
|
||||
|
||||
|
|
@ -2687,7 +2687,7 @@ func BrotliDecoderDecompressStream(s *BrotliDecoderState, available_in *uint, ne
|
|||
return SaveErrorCode(s, result)
|
||||
}
|
||||
|
||||
func BrotliDecoderHasMoreOutput(s *BrotliDecoderState) bool {
|
||||
func BrotliDecoderHasMoreOutput(s *Reader) bool {
|
||||
/* After unrecoverable error remaining output is considered nonsensical. */
|
||||
if int(s.error_code) < 0 {
|
||||
return false
|
||||
|
|
@ -2696,7 +2696,7 @@ func BrotliDecoderHasMoreOutput(s *BrotliDecoderState) bool {
|
|||
return s.ringbuffer != nil && UnwrittenBytes(s, false) != 0
|
||||
}
|
||||
|
||||
func BrotliDecoderTakeOutput(s *BrotliDecoderState, size *uint) []byte {
|
||||
func BrotliDecoderTakeOutput(s *Reader, size *uint) []byte {
|
||||
var result []byte = nil
|
||||
var available_out uint
|
||||
if *size != 0 {
|
||||
|
|
@ -2730,15 +2730,15 @@ func BrotliDecoderTakeOutput(s *BrotliDecoderState, size *uint) []byte {
|
|||
return result
|
||||
}
|
||||
|
||||
func BrotliDecoderIsUsed(s *BrotliDecoderState) bool {
|
||||
func BrotliDecoderIsUsed(s *Reader) bool {
|
||||
return s.state != BROTLI_STATE_UNINITED || BrotliGetAvailableBits(&s.br) != 0
|
||||
}
|
||||
|
||||
func BrotliDecoderIsFinished(s *BrotliDecoderState) bool {
|
||||
func BrotliDecoderIsFinished(s *Reader) bool {
|
||||
return (s.state == BROTLI_STATE_DONE) && !BrotliDecoderHasMoreOutput(s)
|
||||
}
|
||||
|
||||
func BrotliDecoderGetErrorCode(s *BrotliDecoderState) int {
|
||||
func BrotliDecoderGetErrorCode(s *Reader) int {
|
||||
return int(s.error_code)
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,94 @@
|
|||
package brotli
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
)
|
||||
|
||||
type decodeError int
|
||||
|
||||
func (err decodeError) Error() string {
|
||||
return "brotli: " + string(BrotliDecoderErrorString(int(err)))
|
||||
}
|
||||
|
||||
var errExcessiveInput = errors.New("brotli: excessive input")
|
||||
var errInvalidState = errors.New("brotli: invalid state")
|
||||
var errReaderClosed = errors.New("brotli: Reader is closed")
|
||||
|
||||
// readBufSize is a "good" buffer size that avoids excessive round-trips
|
||||
// between C and Go but doesn't waste too much memory on buffering.
|
||||
// It is arbitrarily chosen to be equal to the constant used in io.Copy.
|
||||
const readBufSize = 32 * 1024
|
||||
|
||||
// NewReader initializes new Reader instance.
|
||||
func NewReader(src io.Reader) *Reader {
|
||||
r := new(Reader)
|
||||
BrotliDecoderStateInit(r)
|
||||
r.src = src
|
||||
r.buf = make([]byte, readBufSize)
|
||||
return r
|
||||
}
|
||||
|
||||
func (r *Reader) Read(p []byte) (n int, err error) {
|
||||
if !BrotliDecoderHasMoreOutput(r) && len(r.in) == 0 {
|
||||
m, readErr := r.src.Read(r.buf)
|
||||
if m == 0 {
|
||||
// If readErr is `nil`, we just proxy underlying stream behavior.
|
||||
return 0, readErr
|
||||
}
|
||||
r.in = r.buf[:m]
|
||||
}
|
||||
|
||||
if len(p) == 0 {
|
||||
return 0, nil
|
||||
}
|
||||
|
||||
for {
|
||||
var written uint
|
||||
in_len := uint(len(r.in))
|
||||
out_len := uint(len(p))
|
||||
in_remaining := in_len
|
||||
out_remaining := out_len
|
||||
result := BrotliDecoderDecompressStream(r, &in_remaining, &r.in, &out_remaining, &p, nil)
|
||||
written = out_len - out_remaining
|
||||
n = int(written)
|
||||
|
||||
switch result {
|
||||
case BROTLI_DECODER_RESULT_SUCCESS:
|
||||
if len(r.in) > 0 {
|
||||
return n, errExcessiveInput
|
||||
}
|
||||
return n, nil
|
||||
case BROTLI_DECODER_RESULT_ERROR:
|
||||
return n, decodeError(BrotliDecoderGetErrorCode(r))
|
||||
case BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT:
|
||||
if n == 0 {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
return n, nil
|
||||
case BROTLI_DECODER_NEEDS_MORE_INPUT:
|
||||
}
|
||||
|
||||
if len(r.in) != 0 {
|
||||
return 0, errInvalidState
|
||||
}
|
||||
|
||||
// Calling r.src.Read may block. Don't block if we have data to return.
|
||||
if n > 0 {
|
||||
return n, nil
|
||||
}
|
||||
|
||||
// Top off the buffer.
|
||||
encN, err := r.src.Read(r.buf)
|
||||
if encN == 0 {
|
||||
// Not enough data to complete decoding.
|
||||
if err == io.EOF {
|
||||
return 0, io.ErrUnexpectedEOF
|
||||
}
|
||||
return 0, err
|
||||
}
|
||||
r.in = r.buf[:encN]
|
||||
}
|
||||
|
||||
return n, nil
|
||||
}
|
||||
18
state.go
18
state.go
|
|
@ -1,5 +1,7 @@
|
|||
package brotli
|
||||
|
||||
import "io"
|
||||
|
||||
/* Copyright 2015 Google Inc. All Rights Reserved.
|
||||
|
||||
Distributed under MIT license.
|
||||
|
|
@ -89,7 +91,11 @@ const (
|
|||
BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX
|
||||
)
|
||||
|
||||
type BrotliDecoderState struct {
|
||||
type Reader struct {
|
||||
src io.Reader
|
||||
buf []byte // scratch space for reading from src
|
||||
in []byte // current chunk to decode; usually aliases buf
|
||||
|
||||
state int
|
||||
loop_counter int
|
||||
br BrotliBitReader
|
||||
|
|
@ -177,7 +183,7 @@ type BrotliDecoderState struct {
|
|||
trivial_literal_contexts [8]uint32
|
||||
}
|
||||
|
||||
func BrotliDecoderStateInit(s *BrotliDecoderState) bool {
|
||||
func BrotliDecoderStateInit(s *Reader) bool {
|
||||
s.error_code = 0 /* BROTLI_DECODER_NO_ERROR */
|
||||
|
||||
BrotliInitBitReader(&s.br)
|
||||
|
|
@ -244,7 +250,7 @@ func BrotliDecoderStateInit(s *BrotliDecoderState) bool {
|
|||
return true
|
||||
}
|
||||
|
||||
func BrotliDecoderStateMetablockBegin(s *BrotliDecoderState) {
|
||||
func BrotliDecoderStateMetablockBegin(s *Reader) {
|
||||
s.meta_block_remaining_len = 0
|
||||
s.block_length[0] = 1 << 24
|
||||
s.block_length[1] = 1 << 24
|
||||
|
|
@ -274,7 +280,7 @@ func BrotliDecoderStateMetablockBegin(s *BrotliDecoderState) {
|
|||
s.distance_hgroup.htrees = nil
|
||||
}
|
||||
|
||||
func BrotliDecoderStateCleanupAfterMetablock(s *BrotliDecoderState) {
|
||||
func BrotliDecoderStateCleanupAfterMetablock(s *Reader) {
|
||||
s.context_modes = nil
|
||||
s.context_map = nil
|
||||
s.dist_context_map = nil
|
||||
|
|
@ -283,14 +289,14 @@ func BrotliDecoderStateCleanupAfterMetablock(s *BrotliDecoderState) {
|
|||
s.distance_hgroup.htrees = nil
|
||||
}
|
||||
|
||||
func BrotliDecoderStateCleanup(s *BrotliDecoderState) {
|
||||
func BrotliDecoderStateCleanup(s *Reader) {
|
||||
BrotliDecoderStateCleanupAfterMetablock(s)
|
||||
|
||||
s.ringbuffer = nil
|
||||
s.block_type_trees = nil
|
||||
}
|
||||
|
||||
func BrotliDecoderHuffmanTreeGroupInit(s *BrotliDecoderState, group *HuffmanTreeGroup, alphabet_size uint32, max_symbol uint32, ntrees uint32) bool {
|
||||
func BrotliDecoderHuffmanTreeGroupInit(s *Reader, group *HuffmanTreeGroup, alphabet_size uint32, max_symbol uint32, ntrees uint32) bool {
|
||||
var max_table_size uint = uint(kMaxHuffmanTableSize[(alphabet_size+31)>>5])
|
||||
group.alphabet_size = uint16(alphabet_size)
|
||||
group.max_symbol = uint16(max_symbol)
|
||||
|
|
|
|||
Loading…
Reference in New Issue