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authorRob Pike <r@golang.org>2009-06-09 09:53:44 -0700
committerRob Pike <r@golang.org>2009-06-09 09:53:44 -0700
commit7249ea4df2b4f12a4e7ed446f270cea87e4ffd34 (patch)
tree7032a11d0cac2ae4d3e90f7a189b575b5a50f848 /src/lib/io/bytebuffer.go
parentacf6ef7a82b3fe61516a1bac4563706552bdf078 (diff)
downloadgolang-7249ea4df2b4f12a4e7ed446f270cea87e4ffd34.tar.gz
mv src/lib to src/pkg
tests: all.bash passes, gobuild still works, godoc still works. R=rsc OCL=30096 CL=30102
Diffstat (limited to 'src/lib/io/bytebuffer.go')
-rw-r--r--src/lib/io/bytebuffer.go109
1 files changed, 0 insertions, 109 deletions
diff --git a/src/lib/io/bytebuffer.go b/src/lib/io/bytebuffer.go
deleted file mode 100644
index 921ddb17a..000000000
--- a/src/lib/io/bytebuffer.go
+++ /dev/null
@@ -1,109 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package io
-
-// Simple byte buffer for marshaling data.
-
-import (
- "io";
- "os";
-)
-
-func bytecopy(dst []byte, doff int, src []byte, soff int, count int) {
- for ; count > 0; count-- {
- dst[doff] = src[soff];
- doff++;
- soff++;
- }
-}
-
-// A ByteBuffer is a simple implementation of the io.Read and io.Write interfaces
-// connected to a buffer of bytes.
-// The zero value for ByteBuffer is an empty buffer ready to use.
-type ByteBuffer struct {
- buf []byte; // contents are the bytes buf[off : len(buf)]
- off int; // read at &buf[off], write at &buf[len(buf)]
-}
-
-// Data returns the contents of the unread portion of the buffer;
-// len(b.Data()) == b.Len().
-func (b *ByteBuffer) Data() []byte {
- return b.buf[b.off : len(b.buf)]
-}
-
-// Len returns the number of bytes of the unread portion of the buffer;
-// b.Len() == len(b.Data()).
-func (b *ByteBuffer) Len() int {
- return len(b.buf) - b.off
-}
-
-// Truncate discards all but the first n unread bytes from the buffer.
-// It is an error to call b.Truncate(n) with n > b.Len().
-func (b *ByteBuffer) Truncate(n int) {
- if n == 0 {
- // Reuse buffer space.
- b.off = 0;
- }
- b.buf = b.buf[0 : b.off + n];
-}
-
-// Reset resets the buffer so it has no content.
-// b.Reset() is the same as b.Truncate(0).
-func (b *ByteBuffer) Reset() {
- b.Truncate(0);
-}
-
-// Write appends the contents of p to the buffer. The return
-// value n is the length of p; err is always nil.
-func (b *ByteBuffer) Write(p []byte) (n int, err os.Error) {
- m := b.Len();
- n = len(p);
-
- if len(b.buf) + n > cap(b.buf) {
- // not enough space at end
- buf := b.buf;
- if m + n > cap(b.buf) {
- // not enough space anywhere
- buf = make([]byte, 2*cap(b.buf) + n)
- }
- bytecopy(buf, 0, b.buf, b.off, m);
- b.buf = buf;
- b.off = 0
- }
-
- b.buf = b.buf[0 : b.off + m + n];
- bytecopy(b.buf, b.off + m, p, 0, n);
- return n, nil
-}
-
-// WriteByte appends the byte c to the buffer.
-// The returned error is always nil, but is included
-// to match bufio.Writer's WriteByte.
-func (b *ByteBuffer) WriteByte(c byte) os.Error {
- b.Write([]byte{c});
- return nil;
-}
-
-// Read reads the next len(p) bytes from the buffer or until the buffer
-// is drained. The return value n is the number of bytes read; err is always nil.
-func (b *ByteBuffer) Read(p []byte) (n int, err os.Error) {
- m := b.Len();
- n = len(p);
-
- if n > m {
- // more bytes requested than available
- n = m
- }
-
- bytecopy(p, 0, b.buf, b.off, n);
- b.off += n;
- return n, nil
-}
-
-// NewByteBufferFromArray creates and initializes a new ByteBuffer
-// with buf as its initial contents.
-func NewByteBufferFromArray(buf []byte) *ByteBuffer {
- return &ByteBuffer{buf, 0};
-}