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compress: add comments to gzip and zlib.

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Fixes #2939.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5655050
This commit is contained in:
Nigel Tao 2012-02-11 09:42:07 +11:00
parent e0b2ce3401
commit 18f518362b
4 changed files with 20 additions and 6 deletions
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8
src/pkg/compress/gzip/gunzip.go
View File

@ -34,8 +34,12 @@ func makeReader(r io.Reader) flate.Reader {
return bufio.NewReader(r)
}
var ErrHeader = errors.New("invalid gzip header")
var ErrChecksum = errors.New("gzip checksum error")
var (
// ErrChecksum is returned when reading GZIP data that has an invalid checksum.
ErrChecksum = errors.New("gzip: invalid checksum")
// ErrHeader is returned when reading GZIP data that has an invalid header.
ErrHeader = errors.New("gzip: invalid header")
)
// The gzip file stores a header giving metadata about the compressed file.
// That header is exposed as the fields of the Writer and Reader structs.

2
src/pkg/compress/gzip/gzip.go
View File

@ -130,6 +130,8 @@ func (z *Writer) writeString(s string) (err error) {
return err
}
// Write writes a compressed form of p to the underlying io.Writer. The
// compressed bytes are not necessarily flushed until the Writer is closed.
func (z *Writer) Write(p []byte) (int, error) {
if z.err != nil {
return 0, z.err

11
src/pkg/compress/zlib/reader.go
View File

@ -34,9 +34,14 @@ import (
const zlibDeflate = 8
var ErrChecksum = errors.New("zlib checksum error")
var ErrHeader = errors.New("invalid zlib header")
var ErrDictionary = errors.New("invalid zlib dictionary")
var (
// ErrChecksum is returned when reading ZLIB data that has an invalid checksum.
ErrChecksum = errors.New("zlib: invalid checksum")
// ErrDictionary is returned when reading ZLIB data that has an invalid dictionary.
ErrDictionary = errors.New("zlib: invalid dictionary")
// ErrHeader is returned when reading ZLIB data that has an invalid header.
ErrHeader = errors.New("zlib: invalid header")
)
type reader struct {
r flate.Reader

5
src/pkg/compress/zlib/writer.go
View File

@ -119,6 +119,9 @@ func (z *Writer) writeHeader() (err error) {
return nil
}
// Write writes a compressed form of p to the underlying io.Writer. The
// compressed bytes are not necessarily flushed until the Writer is closed or
// explicitly flushed.
func (z *Writer) Write(p []byte) (n int, err error) {
if !z.wroteHeader {
z.err = z.writeHeader()
@ -138,7 +141,7 @@ func (z *Writer) Write(p []byte) (n int, err error) {
return
}
// Flush flushes the underlying compressor.
// Flush flushes the Writer to its underlying io.Writer.
func (z *Writer) Flush() error {
if !z.wroteHeader {
z.err = z.writeHeader()