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Commit f023e859 authored by Rob Pike's avatar Rob Pike
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compress: renamings. 

NewDeflater -> NewWriter
NewInflater -> NewReader
Deflater -> Compressor
Inflater -> Decompressor

R=rsc
CC=golang-dev
https://golang.org/cl/1166041
parent b541921b
Hide whitespace changes
Inline Side-by-side
Showing with 159 additions and 159 deletions
src/pkg/compress/flate/deflate.go
View file @ f023e859
......@@ -18,8 +18,8 @@ const (
DefaultCompression = -1
logMaxOffsetSize = 15 // Standard DEFLATE
wideLogMaxOffsetSize = 22 // Wide DEFLATE
minMatchLength = 3 // The smallest match that the deflater looks for
maxMatchLength = 258 // The longest match for the deflater
minMatchLength = 3 // The smallest match that the compressor looks for
maxMatchLength = 258 // The longest match for the compressor
minOffsetSize = 1 // The shortest offset that makes any sence
// The maximum number of tokens we put into a single flat block, just too
......@@ -81,7 +81,7 @@ func syncPipe() (*syncPipeReader, *syncPipeWriter) {
return sr, sw
}
type deflater struct {
type compressor struct {
level int
logWindowSize uint
w *huffmanBitWriter
......@@ -118,12 +118,12 @@ type deflater struct {
blockStart int
}
func (d *deflater) flush() os.Error {
func (d *compressor) flush() os.Error {
d.w.flush()
return d.w.err
}
func (d *deflater) fillWindow(index int) (int, os.Error) {
func (d *compressor) fillWindow(index int) (int, os.Error) {
wSize := d.windowMask + 1
if index >= wSize+wSize-(minMatchLength+maxMatchLength) {
// shift the window by wSize
......@@ -152,7 +152,7 @@ func (d *deflater) fillWindow(index int) (int, os.Error) {
return index, err
}
func (d *deflater) writeBlock(tokens []token, index int, eof bool) os.Error {
func (d *compressor) writeBlock(tokens []token, index int, eof bool) os.Error {
if index > 0 || eof {
var window []byte
if d.blockStart <= index {
......@@ -167,7 +167,7 @@ func (d *deflater) writeBlock(tokens []token, index int, eof bool) os.Error {
// Try to find a match starting at index whose length is greater than prevSize.
// We only look at chainCount possibilities before giving up.
func (d *deflater) findMatch(pos int, prevHead int, prevLength int, lookahead int) (length, offset int, ok bool) {
func (d *compressor) findMatch(pos int, prevHead int, prevLength int, lookahead int) (length, offset int, ok bool) {
win := d.window[0 : pos+min(maxMatchLength, lookahead)]
// We quit when we get a match that's at least nice long
......@@ -215,7 +215,7 @@ func (d *deflater) findMatch(pos int, prevHead int, prevLength int, lookahead in
return
}
func (d *deflater) writeStoredBlock(buf []byte) os.Error {
func (d *compressor) writeStoredBlock(buf []byte) os.Error {
if d.w.writeStoredHeader(len(buf), false); d.w.err != nil {
return d.w.err
}
......@@ -223,7 +223,7 @@ func (d *deflater) writeStoredBlock(buf []byte) os.Error {
return d.w.err
}
func (d *deflater) storedDeflate() os.Error {
func (d *compressor) storedDeflate() os.Error {
buf := make([]byte, maxStoreBlockSize)
for {
n, err := d.r.Read(buf)
......@@ -242,7 +242,7 @@ func (d *deflater) storedDeflate() os.Error {
return nil
}
func (d *deflater) doDeflate() (err os.Error) {
func (d *compressor) doDeflate() (err os.Error) {
// init
d.windowMask = 1<<d.logWindowSize - 1
d.hashHead = make([]int, hashSize)
......@@ -399,7 +399,7 @@ func (d *deflater) doDeflate() (err os.Error) {
return
}
func (d *deflater) deflater(r io.Reader, w io.Writer, level int, logWindowSize uint) (err os.Error) {
func (d *compressor) compressor(r io.Reader, w io.Writer, level int, logWindowSize uint) (err os.Error) {
d.r = r
d.w = newHuffmanBitWriter(w)
d.level = level
......@@ -426,16 +426,16 @@ func (d *deflater) deflater(r io.Reader, w io.Writer, level int, logWindowSize u
return d.flush()
}
func newDeflater(w io.Writer, level int, logWindowSize uint) io.WriteCloser {
var d deflater
func newCompressor(w io.Writer, level int, logWindowSize uint) io.WriteCloser {
var d compressor
pr, pw := syncPipe()
go func() {
err := d.deflater(pr, w, level, logWindowSize)
err := d.compressor(pr, w, level, logWindowSize)
pr.CloseWithError(err)
}()
return pw
}
func NewDeflater(w io.Writer, level int) io.WriteCloser {
return newDeflater(w, level, logMaxOffsetSize)
func NewWriter(w io.Writer, level int) io.WriteCloser {
return newCompressor(w, level, logMaxOffsetSize)
}
src/pkg/compress/flate/deflate_test.go
View file @ f023e859
......@@ -80,7 +80,7 @@ func getLargeDataChunk() []byte {
func TestDeflate(t *testing.T) {
for _, h := range deflateTests {
buffer := bytes.NewBuffer([]byte{})
w := NewDeflater(buffer, h.level)
w := NewWriter(buffer, h.level)
w.Write(h.in)
w.Close()
if bytes.Compare(buffer.Bytes(), h.out) != 0 {
......@@ -92,16 +92,16 @@ func TestDeflate(t *testing.T) {
func testToFromWithLevel(t *testing.T, level int, input []byte, name string) os.Error {
buffer := bytes.NewBuffer([]byte{})
w := NewDeflater(buffer, level)
w := NewWriter(buffer, level)
w.Write(input)
w.Close()
inflater := NewInflater(buffer)
decompressed, err := ioutil.ReadAll(inflater)
decompressor := NewReader(buffer)
decompressed, err := ioutil.ReadAll(decompressor)
if err != nil {
t.Errorf("reading inflater: %s", err)
t.Errorf("reading decompressor: %s", err)
return err
}
inflater.Close()
decompressor.Close()
if bytes.Compare(input, decompressed) != 0 {
t.Errorf("decompress(compress(data)) != data: level=%d input=%s", level, name)
}
......
src/pkg/compress/flate/flate_test.go
View file @ f023e859
......@@ -4,7 +4,7 @@
// This test tests some internals of the flate package.
// The tests in package compress/gzip serve as the
// end-to-end test of the inflater.
// end-to-end test of the decompressor.
package flate
......@@ -127,7 +127,7 @@ func TestInitDecoder(t *testing.T) {
}
func TestUncompressedSource(t *testing.T) {
decoder := NewInflater(bytes.NewBuffer([]byte{0x01, 0x01, 0x00, 0xfe, 0xff, 0x11}))
decoder := NewReader(bytes.NewBuffer([]byte{0x01, 0x01, 0x00, 0xfe, 0xff, 0x11}))
output := make([]byte, 1)
n, error := decoder.Read(output)
if n != 1 || error != nil {
......
src/pkg/compress/flate/huffman_bit_writer.go
View file @ f023e859
......@@ -291,7 +291,7 @@ func (w *huffmanBitWriter) writeDynamicHeader(numLiterals int, numOffsets int, n
w.writeBits(firstBits, 3)
w.writeBits(int32(numLiterals-257), 5)
if numOffsets > offsetCodeCount {
// Extended version of deflater
// Extended version of decompressor
w.writeBits(int32(offsetCodeCount+((numOffsets-(1+offsetCodeCount))>>3)), 5)
w.writeBits(int32((numOffsets-(1+offsetCodeCount))&0x7), 3)
} else {
......
src/pkg/compress/flate/inflate.go
View file @ f023e859
......@@ -188,16 +188,16 @@ var fixedHuffmanDecoder = huffmanDecoder{
},
}
// The actual read interface needed by NewInflater.
// The actual read interface needed by NewReader.
// If the passed in io.Reader does not also have ReadByte,
// the NewInflater will introduce its own buffering.
// the NewReader will introduce its own buffering.
type Reader interface {
io.Reader
ReadByte() (c byte, err os.Error)
}
// Inflate state.
type inflater struct {
// Decompress state.
type decompressor struct {
// Input/output sources.
r Reader
w io.Writer
......@@ -224,7 +224,7 @@ type inflater struct {
buf [4]byte
}
func (f *inflater) inflate() (err os.Error) {
func (f *decompressor) inflate() (err os.Error) {
final := false
for err == nil && !final {
for f.nb < 1+2 {
......@@ -261,7 +261,7 @@ func (f *inflater) inflate() (err os.Error) {
var codeOrder = [...]int{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}
func (f *inflater) readHuffman() os.Error {
func (f *decompressor) readHuffman() os.Error {
// HLIT[5], HDIST[5], HCLEN[4].
for f.nb < 5+5+4 {
if err := f.moreBits(); err != nil {
......@@ -358,7 +358,7 @@ func (f *inflater) readHuffman() os.Error {
// hl and hd are the Huffman states for the lit/length values
// and the distance values, respectively. If hd == nil, using the
// fixed distance encoding associated with fixed Huffman blocks.
func (f *inflater) decodeBlock(hl, hd *huffmanDecoder) os.Error {
func (f *decompressor) decodeBlock(hl, hd *huffmanDecoder) os.Error {
for {
v, err := f.huffSym(hl)
if err != nil {
......@@ -480,7 +480,7 @@ func (f *inflater) decodeBlock(hl, hd *huffmanDecoder) os.Error {
}
// Copy a single uncompressed data block from input to output.
func (f *inflater) dataBlock() os.Error {
func (f *decompressor) dataBlock() os.Error {
// Uncompressed.
// Discard current half-byte.
f.nb = 0
......@@ -521,7 +521,7 @@ func (f *inflater) dataBlock() os.Error {
return nil
}
func (f *inflater) moreBits() os.Error {
func (f *decompressor) moreBits() os.Error {
c, err := f.r.ReadByte()
if err != nil {
if err == os.EOF {
......@@ -536,7 +536,7 @@ func (f *inflater) moreBits() os.Error {
}
// Read the next Huffman-encoded symbol from f according to h.
func (f *inflater) huffSym(h *huffmanDecoder) (int, os.Error) {
func (f *decompressor) huffSym(h *huffmanDecoder) (int, os.Error) {
for n := uint(h.min); n <= uint(h.max); n++ {
lim := h.limit[n]
if lim == -1 {
......@@ -560,7 +560,7 @@ func (f *inflater) huffSym(h *huffmanDecoder) (int, os.Error) {
}
// Flush any buffered output to the underlying writer.
func (f *inflater) flush() os.Error {
func (f *decompressor) flush() os.Error {
if f.hp == 0 {
return nil
}
......@@ -586,7 +586,7 @@ func makeReader(r io.Reader) Reader {
// Inflate reads DEFLATE-compressed data from r and writes
// the uncompressed data to w.
func (f *inflater) inflater(r io.Reader, w io.Writer) os.Error {
func (f *decompressor) decompressor(r io.Reader, w io.Writer) os.Error {
f.r = makeReader(r)
f.w = w
f.woffset = 0
......@@ -599,13 +599,13 @@ func (f *inflater) inflater(r io.Reader, w io.Writer) os.Error {
return nil
}
// NewInflater returns a new ReadCloser that can be used
// NewReader returns a new ReadCloser that can be used
// to read the uncompressed version of r. It is the caller's
// responsibility to call Close on the ReadCloser when
// finished reading.
func NewInflater(r io.Reader) io.ReadCloser {
var f inflater
func NewReader(r io.Reader) io.ReadCloser {
var f decompressor
pr, pw := io.Pipe()
go func() { pw.CloseWithError(f.inflater(r, pw)) }()
go func() { pw.CloseWithError(f.decompressor(r, pw)) }()
return pr
}
src/pkg/compress/gzip/gunzip.go
View file @ f023e859
......@@ -40,7 +40,7 @@ var HeaderError os.Error = os.ErrorString("invalid gzip header")
var ChecksumError os.Error = os.ErrorString("gzip checksum error")
// The gzip file stores a header giving metadata about the compressed file.
// That header is exposed as the fields of the Deflater and Inflater structs.
// That header is exposed as the fields of the Compressor and Decompressor structs.
type Header struct {
Comment string // comment
Extra []byte // "extra data"
......@@ -49,36 +49,36 @@ type Header struct {
OS byte // operating system type
}
// An Inflater is an io.Reader that can be read to retrieve
// An Decompressor is an io.Reader that can be read to retrieve
// uncompressed data from a gzip-format compressed file.
//
// In general, a gzip file can be a concatenation of gzip files,
// each with its own header. Reads from the Inflater
// each with its own header. Reads from the Decompressor
// return the concatenation of the uncompressed data of each.
// Only the first header is recorded in the Inflater fields.
// Only the first header is recorded in the Decompressor fields.
//
// Gzip files store a length and checksum of the uncompressed data.
// The Inflater will return a ChecksumError when Read
// The Decompressor will return a ChecksumError when Read
// reaches the end of the uncompressed data if it does not
// have the expected length or checksum. Clients should treat data
// returned by Read as tentative until they receive the successful
// (zero length, nil error) Read marking the end of the data.
type Inflater struct {
type Decompressor struct {
Header
r flate.Reader
inflater io.ReadCloser
digest hash.Hash32
size uint32
flg byte
buf [512]byte
err os.Error
r flate.Reader
decompressor io.ReadCloser
digest hash.Hash32
size uint32
flg byte
buf [512]byte
err os.Error
}
// NewInflater creates a new Inflater reading the given reader.
// NewReader creates a new Decompressor reading the given reader.
// The implementation buffers input and may read more data than necessary from r.
// It is the caller's responsibility to call Close on the Inflater when done.
func NewInflater(r io.Reader) (*Inflater, os.Error) {
z := new(Inflater)
// It is the caller's responsibility to call Close on the Decompressor when done.
func NewReader(r io.Reader) (*Decompressor, os.Error) {
z := new(Decompressor)
z.r = makeReader(r)
z.digest = crc32.NewIEEE()
if err := z.readHeader(true); err != nil {
......@@ -93,7 +93,7 @@ func get4(p []byte) uint32 {
return uint32(p[0]) | uint32(p[1])<<8 | uint32(p[2])<<16 | uint32(p[3])<<24
}
func (z *Inflater) readString() (string, os.Error) {
func (z *Decompressor) readString() (string, os.Error) {
var err os.Error
for i := 0; ; i++ {
if i >= len(z.buf) {
......@@ -112,7 +112,7 @@ func (z *Inflater) readString() (string, os.Error) {
panic("not reached")
}
func (z *Inflater) read2() (uint32, os.Error) {
func (z *Decompressor) read2() (uint32, os.Error) {
_, err := io.ReadFull(z.r, z.buf[0:2])
if err != nil {
return 0, err
......@@ -120,7 +120,7 @@ func (z *Inflater) read2() (uint32, os.Error) {
return uint32(z.buf[0]) | uint32(z.buf[1])<<8, nil
}
func (z *Inflater) readHeader(save bool) os.Error {
func (z *Decompressor) readHeader(save bool) os.Error {
_, err := io.ReadFull(z.r, z.buf[0:10])
if err != nil {
return err
......@@ -182,11 +182,11 @@ func (z *Inflater) readHeader(save bool) os.Error {
}
z.digest.Reset()
z.inflater = flate.NewInflater(z.r)
z.decompressor = flate.NewReader(z.r)
return nil
}
func (z *Inflater) Read(p []byte) (n int, err os.Error) {
func (z *Decompressor) Read(p []byte) (n int, err os.Error) {
if z.err != nil {
return 0, z.err
}
......@@ -194,7 +194,7 @@ func (z *Inflater) Read(p []byte) (n int, err os.Error) {
return 0, nil
}
n, err = z.inflater.Read(p)
n, err = z.decompressor.Read(p)
z.digest.Write(p[0:n])
z.size += uint32(n)
if n != 0 || err != os.EOF {
......@@ -226,5 +226,5 @@ func (z *Inflater) Read(p []byte) (n int, err os.Error) {
return z.Read(p)
}
// Calling Close does not close the wrapped io.Reader originally passed to NewInflater.
func (z *Inflater) Close() os.Error { return z.inflater.Close() }
// Calling Close does not close the wrapped io.Reader originally passed to NewReader.
func (z *Decompressor) Close() os.Error { return z.decompressor.Close() }
src/pkg/compress/gzip/gunzip_test.go
View file @ f023e859
......@@ -279,13 +279,13 @@ var gunzipTests = []gunzipTest{
},
}
func TestInflater(t *testing.T) {
func TestDecompressor(t *testing.T) {
b := new(bytes.Buffer)
for _, tt := range gunzipTests {
in := bytes.NewBuffer(tt.gzip)
gzip, err := NewInflater(in)
gzip, err := NewReader(in)
if err != nil {
t.Errorf("%s: NewInflater: %s", tt.name, err)
t.Errorf("%s: NewReader: %s", tt.name, err)
continue
}
defer gzip.Close()
......
src/pkg/compress/gzip/gzip.go
View file @ f023e859
......@@ -21,34 +21,34 @@ const (
DefaultCompression = flate.DefaultCompression
)
// A Deflater is an io.WriteCloser that satisfies writes by compressing data written
// A Compressor is an io.WriteCloser that satisfies writes by compressing data written
// to its wrapped io.Writer.
type Deflater struct {
type Compressor struct {
Header
w io.Writer
level int
deflater io.WriteCloser
digest hash.Hash32
size uint32
closed bool
buf [10]byte
err os.Error
w io.Writer
level int
compressor io.WriteCloser
digest hash.Hash32
size uint32
closed bool
buf [10]byte
err os.Error
}
// NewDeflater calls NewDeflaterLevel with the default compression level.
func NewDeflater(w io.Writer) (*Deflater, os.Error) {
return NewDeflaterLevel(w, DefaultCompression)
// NewWriter calls NewWriterLevel with the default compression level.
func NewWriter(w io.Writer) (*Compressor, os.Error) {
return NewWriterLevel(w, DefaultCompression)
}
// NewDeflaterLevel creates a new Deflater writing to the given writer.
// NewWriterLevel creates a new Compressor writing to the given writer.
// Writes may be buffered and not flushed until Close.
// Callers that wish to set the fields in Deflater.Header must
// Callers that wish to set the fields in Compressor.Header must
// do so before the first call to Write or Close.
// It is the caller's responsibility to call Close on the WriteCloser when done.
// level is the compression level, which can be DefaultCompression, NoCompression,
// or any integer value between BestSpeed and BestCompression (inclusive).
func NewDeflaterLevel(w io.Writer, level int) (*Deflater, os.Error) {
z := new(Deflater)
func NewWriterLevel(w io.Writer, level int) (*Compressor, os.Error) {
z := new(Compressor)
z.OS = 255 // unknown
z.w = w
z.level = level
......@@ -70,7 +70,7 @@ func put4(p []byte, v uint32) {
}
// writeBytes writes a length-prefixed byte slice to z.w.
func (z *Deflater) writeBytes(b []byte) os.Error {
func (z *Compressor) writeBytes(b []byte) os.Error {
if len(b) > 0xffff {
return os.NewError("gzip.Write: Extra data is too large")
}
......@@ -84,7 +84,7 @@ func (z *Deflater) writeBytes(b []byte) os.Error {
}
// writeString writes a string (in ISO 8859-1 (Latin-1) format) to z.w.
func (z *Deflater) writeString(s string) os.Error {
func (z *Compressor) writeString(s string) os.Error {
// GZIP (RFC 1952) specifies that strings are NUL-terminated ISO 8859-1 (Latin-1).
// TODO(nigeltao): Convert from UTF-8 to ISO 8859-1 (Latin-1).
for _, v := range s {
......@@ -102,13 +102,13 @@ func (z *Deflater) writeString(s string) os.Error {
return err
}
func (z *Deflater) Write(p []byte) (int, os.Error) {
func (z *Compressor) Write(p []byte) (int, os.Error) {
if z.err != nil {
return 0, z.err
}
var n int
// Write the GZIP header lazily.
if z.deflater == nil {
if z.compressor == nil {
z.buf[0] = gzipID1
z.buf[1] = gzipID2
z.buf[2] = gzipDeflate
......@@ -153,16 +153,16 @@ func (z *Deflater) Write(p []byte) (int, os.Error) {
return n, z.err
}
}
z.deflater = flate.NewDeflater(z.w, z.level)
z.compressor = flate.NewWriter(z.w, z.level)
}
z.size += uint32(len(p))
z.digest.Write(p)
n, z.err = z.deflater.Write(p)
n, z.err = z.compressor.Write(p)
return n, z.err
}
// Calling Close does not close the wrapped io.Writer originally passed to NewDeflater.
func (z *Deflater) Close() os.Error {
// Calling Close does not close the wrapped io.Writer originally passed to NewWriter.
func (z *Compressor) Close() os.Error {
if z.err != nil {
return z.err
}
......@@ -170,13 +170,13 @@ func (z *Deflater) Close() os.Error {
return nil
}
z.closed = true
if z.deflater == nil {
if z.compressor == nil {
z.Write(nil)
if z.err != nil {
return z.err
}
}
z.err = z.deflater.Close()
z.err = z.compressor.Close()
if z.err != nil {
return z.err
}
......
src/pkg/compress/gzip/gzip_test.go
View file @ f023e859
......@@ -12,32 +12,32 @@ import (
// pipe creates two ends of a pipe that gzip and gunzip, and runs dfunc at the
// writer end and ifunc at the reader end.
func pipe(t *testing.T, dfunc func(*Deflater), ifunc func(*Inflater)) {
func pipe(t *testing.T, dfunc func(*Compressor), cfunc func(*Decompressor)) {
piper, pipew := io.Pipe()
defer piper.Close()
go func() {
defer pipew.Close()
deflater, err := NewDeflater(pipew)
compressor, err := NewWriter(pipew)
if err != nil {
t.Fatalf("%v", err)
}
defer deflater.Close()
dfunc(deflater)
defer compressor.Close()
dfunc(compressor)
}()
inflater, err := NewInflater(piper)
decompressor, err := NewReader(piper)
if err != nil {
t.Fatalf("%v", err)
}
defer inflater.Close()
ifunc(inflater)
defer decompressor.Close()
cfunc(decompressor)
}
// Tests that an empty payload still forms a valid GZIP stream.
func TestEmpty(t *testing.T) {
pipe(t,
func(deflater *Deflater) {},
func(inflater *Inflater) {
b, err := ioutil.ReadAll(inflater)
func(compressor *Compressor) {},
func(decompressor *Decompressor) {
b, err := ioutil.ReadAll(decompressor)
if err != nil {
t.Fatalf("%v", err)
}
......@@ -50,35 +50,35 @@ func TestEmpty(t *testing.T) {
// Tests that gzipping and then gunzipping is the identity function.
func TestWriter(t *testing.T) {
pipe(t,
func(deflater *Deflater) {
deflater.Comment = "comment"
deflater.Extra = []byte("extra")
deflater.Mtime = 1e8
deflater.Name = "name"
_, err := deflater.Write([]byte("payload"))
func(compressor *Compressor) {
compressor.Comment = "comment"
compressor.Extra = []byte("extra")
compressor.Mtime = 1e8
compressor.Name = "name"
_, err := compressor.Write([]byte("payload"))
if err != nil {
t.Fatalf("%v", err)
}
},
func(inflater *Inflater) {
b, err := ioutil.ReadAll(inflater)
func(decompressor *Decompressor) {
b, err := ioutil.ReadAll(decompressor)
if err != nil {
t.Fatalf("%v", err)
}
if string(b) != "payload" {
t.Fatalf("payload is %q, want %q", string(b), "payload")
}
if inflater.Comment != "comment" {
t.Fatalf("comment is %q, want %q", inflater.Comment, "comment")
if decompressor.Comment != "comment" {
t.Fatalf("comment is %q, want %q", decompressor.Comment, "comment")
}
if string(inflater.Extra) != "extra" {
t.Fatalf("extra is %q, want %q", inflater.Extra, "extra")
if string(decompressor.Extra) != "extra" {
t.Fatalf("extra is %q, want %q", decompressor.Extra, "extra")
}
if inflater.Mtime != 1e8 {
t.Fatalf("mtime is %d, want %d", inflater.Mtime, uint32(1e8))
if decompressor.Mtime != 1e8 {
t.Fatalf("mtime is %d, want %d", decompressor.Mtime, uint32(1e8))
}
if inflater.Name != "name" {
t.Fatalf("name is %q, want %q", inflater.Name, "name")
if decompressor.Name != "name" {
t.Fatalf("name is %q, want %q", decompressor.Name, "name")
}
})
}
src/pkg/compress/zlib/reader.go
View file @ f023e859
......@@ -11,13 +11,13 @@ and compress during writing. For example, to write compressed data
to a buffer:
var b bytes.Buffer
w, err := zlib.NewDeflater(&b)
w, err := zlib.NewWriter(&b)
w.Write([]byte("hello, world\n"))
w.Close()
and to read that data back:
r, err := zlib.NewInflater(&b)
r, err := zlib.NewReader(&b)
io.Copy(os.Stdout, r)
r.Close()
*/
......@@ -39,17 +39,17 @@ var HeaderError os.Error = os.ErrorString("invalid zlib header")
var UnsupportedError os.Error = os.ErrorString("unsupported zlib format")
type reader struct {
r flate.Reader
inflater io.ReadCloser
digest hash.Hash32
err os.Error
scratch [4]byte
r flate.Reader
decompressor io.ReadCloser
digest hash.Hash32
err os.Error
scratch [4]byte
}
// NewInflater creates a new io.ReadCloser that satisfies reads by decompressing data read from r.
// NewReader creates a new io.ReadCloser that satisfies reads by decompressing data read from r.
// The implementation buffers input and may read more data than necessary from r.
// It is the caller's responsibility to call Close on the ReadCloser when done.
func NewInflater(r io.Reader) (io.ReadCloser, os.Error) {
func NewReader(r io.Reader) (io.ReadCloser, os.Error) {
z := new(reader)
if fr, ok := r.(flate.Reader); ok {
z.r = fr
......@@ -69,7 +69,7 @@ func NewInflater(r io.Reader) (io.ReadCloser, os.Error) {
return nil, UnsupportedError
}
z.digest = adler32.New()
z.inflater = flate.NewInflater(z.r)
z.decompressor = flate.NewReader(z.r)
return z, nil
}
......@@ -81,7 +81,7 @@ func (z *reader) Read(p []byte) (n int, err os.Error) {
return 0, nil
}
n, err = z.inflater.Read(p)
n, err = z.decompressor.Read(p)
z.digest.Write(p[0:n])
if n != 0 || err != os.EOF {
z.err = err
......@@ -102,11 +102,11 @@ func (z *reader) Read(p []byte) (n int, err os.Error) {
return
}
// Calling Close does not close the wrapped io.Reader originally passed to NewInflater.
// Calling Close does not close the wrapped io.Reader originally passed to NewReader.
func (z *reader) Close() os.Error {
if z.err != nil {
return z.err
}
z.err = z.inflater.Close()
z.err = z.decompressor.Close()
return z.err
}
src/pkg/compress/zlib/reader_test.go
View file @ f023e859
......@@ -67,14 +67,14 @@ var zlibTests = []zlibTest{
},
}
func TestInflater(t *testing.T) {
func TestDecompressor(t *testing.T) {
b := new(bytes.Buffer)
for _, tt := range zlibTests {
in := bytes.NewBuffer(tt.compressed)
zlib, err := NewInflater(in)
zlib, err := NewReader(in)
if err != nil {
if err != tt.err {
t.Errorf("%s: NewInflater: %s", tt.desc, err)
t.Errorf("%s: NewReader: %s", tt.desc, err)
}
continue
}
......
src/pkg/compress/zlib/writer.go
View file @ f023e859
......@@ -22,23 +22,23 @@ const (
)
type writer struct {
w io.Writer
deflater io.WriteCloser
digest hash.Hash32
err os.Error
scratch [4]byte
w io.Writer
compressor io.WriteCloser
digest hash.Hash32
err os.Error
scratch [4]byte
}
// NewDeflater calls NewDeflaterLevel with the default compression level.
func NewDeflater(w io.Writer) (io.WriteCloser, os.Error) {
return NewDeflaterLevel(w, DefaultCompression)
// NewWriter calls NewWriterLevel with the default compression level.
func NewWriter(w io.Writer) (io.WriteCloser, os.Error) {
return NewWriterLevel(w, DefaultCompression)
}
// NewDeflaterLevel creates a new io.WriteCloser that satisfies writes by compressing data written to w.
// NewWriterLevel creates a new io.WriteCloser that satisfies writes by compressing data written to w.
// It is the caller's responsibility to call Close on the WriteCloser when done.
// level is the compression level, which can be DefaultCompression, NoCompression,
// or any integer value between BestSpeed and BestCompression (inclusive).
func NewDeflaterLevel(w io.Writer, level int) (io.WriteCloser, os.Error) {
func NewWriterLevel(w io.Writer, level int) (io.WriteCloser, os.Error) {
z := new(writer)
// ZLIB has a two-byte header (as documented in RFC 1950).
// The first four bits is the CINFO (compression info), which is 7 for the default deflate window size.
......@@ -65,7 +65,7 @@ func NewDeflaterLevel(w io.Writer, level int) (io.WriteCloser, os.Error) {
return nil, err
}
z.w = w
z.deflater = flate.NewDeflater(w, level)
z.compressor = flate.NewWriter(w, level)
z.digest = adler32.New()
return z, nil
}
......@@ -77,7 +77,7 @@ func (z *writer) Write(p []byte) (n int, err os.Error) {
if len(p) == 0 {
return 0, nil
}
n, err = z.deflater.Write(p)
n, err = z.compressor.Write(p)
if err != nil {
z.err = err
return
......@@ -86,12 +86,12 @@ func (z *writer) Write(p []byte) (n int, err os.Error) {
return
}
// Calling Close does not close the wrapped io.Writer originally passed to NewDeflater.
// Calling Close does not close the wrapped io.Writer originally passed to NewWriter.
func (z *writer) Close() os.Error {
if z.err != nil {
return z.err
}
z.err = z.deflater.Close()
z.err = z.compressor.Close()
if z.err != nil {
return z.err
}
......
src/pkg/compress/zlib/writer_test.go
View file @ f023e859
......@@ -38,7 +38,7 @@ func testFileLevel(t *testing.T, fn string, level int) {
go func() {
defer raw.Close()
defer pipew.Close()
zlibw, err := NewDeflaterLevel(pipew, level)
zlibw, err := NewWriterLevel(pipew, level)
if err != nil {
t.Errorf("%s (level=%d): %v", fn, level, err)
return
......@@ -65,7 +65,7 @@ func testFileLevel(t *testing.T, fn string, level int) {
}
}
}()
zlibr, err := NewInflater(piper)
zlibr, err := NewReader(piper)
if err != nil {
t.Errorf("%s (level=%d): %v", fn, level, err)
return
......
src/pkg/crypto/rand/rand_test.go
View file @ f023e859
......@@ -18,7 +18,7 @@ func TestRead(t *testing.T) {
}
var z bytes.Buffer
f := flate.NewDeflater(&z, 5)
f := flate.NewWriter(&z, 5)
f.Write(b)
f.Close()
if z.Len() < len(b)*99/100 {
......
src/pkg/image/png/reader.go
View file @ f023e859
......@@ -206,7 +206,7 @@ func paeth(a, b, c uint8) uint8 {
}
func (d *decoder) idatReader(idat io.Reader) os.Error {
r, err := zlib.NewInflater(idat)
r, err := zlib.NewReader(idat)
if err != nil {
return err
}
......
src/pkg/image/png/writer.go
View file @ f023e859
......@@ -119,7 +119,7 @@ func (e *encoder) writePLTE(p image.PalettedColorModel) {
// This method should only be called from writeIDATs (via writeImage).
// No other code should treat an encoder as an io.Writer.
//
// Note that, because the zlib deflater may involve an io.Pipe, e.Write calls may
// Note that, because the zlib Reader may involve an io.Pipe, e.Write calls may
// occur on a separate go-routine than the e.writeIDATs call, and care should be
// taken that e's state (such as its tmp buffer) is not modified concurrently.
func (e *encoder) Write(b []byte) (int, os.Error) {
......@@ -225,7 +225,7 @@ func filter(cr [][]byte, pr []byte, bpp int) int {
}
func writeImage(w io.Writer, m image.Image, ct uint8) os.Error {
zw, err := zlib.NewDeflater(w)
zw, err := zlib.NewWriter(w)
if err != nil {
return err
}
......
src/pkg/patch/git.go
View file @ f023e859
......@@ -91,7 +91,7 @@ func ParseGitBinary(raw []byte) (Diff, os.Error) {
if n, _, ok := atoi(first, "literal ", 10); ok && sawBinary {
data := make([]byte, n)
d := git85.NewDecoder(bytes.NewBuffer(raw))
z, err := zlib.NewInflater(d)
z, err := zlib.NewReader(d)
if err != nil {
return nil, err
}
......
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