diff options
Diffstat (limited to 'src/pkg/compress/zlib/writer.go')
-rw-r--r-- | src/pkg/compress/zlib/writer.go | 68 |
1 files changed, 34 insertions, 34 deletions
diff --git a/src/pkg/compress/zlib/writer.go b/src/pkg/compress/zlib/writer.go index 25abcde3b..0441b0463 100644 --- a/src/pkg/compress/zlib/writer.go +++ b/src/pkg/compress/zlib/writer.go @@ -5,28 +5,28 @@ package zlib import ( - "compress/flate"; - "hash"; - "hash/adler32"; - "io"; - "os"; + "compress/flate" + "hash" + "hash/adler32" + "io" + "os" ) // These constants are copied from the flate package, so that code that imports // "compress/zlib" does not also have to import "compress/flate". const ( - NoCompression = flate.NoCompression; - BestSpeed = flate.BestSpeed; - BestCompression = flate.BestCompression; - DefaultCompression = flate.DefaultCompression; + NoCompression = flate.NoCompression + BestSpeed = flate.BestSpeed + BestCompression = flate.BestCompression + DefaultCompression = flate.DefaultCompression ) type writer struct { - w io.Writer; - deflater io.WriteCloser; - digest hash.Hash32; - err os.Error; - scratch [4]byte; + w io.Writer + deflater io.WriteCloser + digest hash.Hash32 + err os.Error + scratch [4]byte } // NewDeflater calls NewDeflaterLevel with the default compression level. @@ -39,11 +39,11 @@ func NewDeflater(w io.Writer) (io.WriteCloser, os.Error) { // 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) { - z := new(writer); + 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. // The next four bits is the CM (compression method), which is 8 for deflate. - z.scratch[0] = 0x78; + z.scratch[0] = 0x78 // The next two bits is the FLEVEL (compression level). The four values are: // 0=fastest, 1=fast, 2=default, 3=best. // The next bit, FDICT, is unused, in this implementation. @@ -60,14 +60,14 @@ func NewDeflaterLevel(w io.Writer, level int) (io.WriteCloser, os.Error) { default: return nil, os.NewError("level out of range") } - _, err := w.Write(z.scratch[0:2]); + _, err := w.Write(z.scratch[0:2]) if err != nil { return nil, err } - z.w = w; - z.deflater = flate.NewDeflater(w, level); - z.digest = adler32.New(); - return z, nil; + z.w = w + z.deflater = flate.NewDeflater(w, level) + z.digest = adler32.New() + return z, nil } func (z *writer) Write(p []byte) (n int, err os.Error) { @@ -77,13 +77,13 @@ 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.deflater.Write(p) if err != nil { - z.err = err; - return; + z.err = err + return } - z.digest.Write(p); - return; + z.digest.Write(p) + return } // Calling Close does not close the wrapped io.Writer originally passed to NewDeflater. @@ -91,16 +91,16 @@ func (z *writer) Close() os.Error { if z.err != nil { return z.err } - z.err = z.deflater.Close(); + z.err = z.deflater.Close() if z.err != nil { return z.err } - checksum := z.digest.Sum32(); + checksum := z.digest.Sum32() // ZLIB (RFC 1950) is big-endian, unlike GZIP (RFC 1952). - z.scratch[0] = uint8(checksum >> 24); - z.scratch[1] = uint8(checksum >> 16); - z.scratch[2] = uint8(checksum >> 8); - z.scratch[3] = uint8(checksum >> 0); - _, z.err = z.w.Write(z.scratch[0:4]); - return z.err; + z.scratch[0] = uint8(checksum >> 24) + z.scratch[1] = uint8(checksum >> 16) + z.scratch[2] = uint8(checksum >> 8) + z.scratch[3] = uint8(checksum >> 0) + _, z.err = z.w.Write(z.scratch[0:4]) + return z.err } |