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document io

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R=rsc
DELTA=44  (30 added, 4 deleted, 10 changed)
OCL=25819
CL=25835
This commit is contained in:
Rob Pike 2009-03-06 03:43:44 -08:00
parent 5b4fa1ad22
commit 7bb335c7de
3 changed files with 39 additions and 13 deletions
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21
src/lib/io/bytebuffer.go
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@ -4,15 +4,13 @@
package io
// Byte buffer for marshaling nested messages.
// Simple byte buffer for marshaling data.
import (
"io";
"os";
)
// A simple implementation of the io.Read and io.Write interfaces.
// A newly allocated ByteBuffer is ready to use.
// TODO(r): Do better memory management.
@ -24,6 +22,9 @@ func bytecopy(dst []byte, doff int, src []byte, soff int, count int) {
}
}
// 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;
off int; // Read from here
@ -31,11 +32,14 @@ type ByteBuffer struct {
cap int;
}
// Reset resets the buffer so it has no content.
func (b *ByteBuffer) Reset() {
b.off = 0;
b.len = 0;
}
// Write appends the contents of p to the buffer. The return
// value is the length of p; err is always nil.
func (b *ByteBuffer) Write(p []byte) (n int, err *os.Error) {
plen := len(p);
if len(b.buf) == 0 {
@ -54,6 +58,8 @@ func (b *ByteBuffer) Write(p []byte) (n int, err *os.Error) {
return plen, nil;
}
// Read reads the next len(p) bytes from the buffer or until the buffer
// is drained. The return value is the number of bytes read; err is always nil.
func (b *ByteBuffer) Read(p []byte) (n int, err *os.Error) {
plen := len(p);
if len(b.buf) == 0 {
@ -71,22 +77,23 @@ func (b *ByteBuffer) Read(p []byte) (n int, err *os.Error) {
return plen, nil;
}
// Len returns the length of the underlying buffer.
func (b *ByteBuffer) Len() int {
return b.len
}
// Off returns the location within the buffer of the next byte to be read.
func (b *ByteBuffer) Off() int {
return b.off
}
// Data returns the contents of the unread portion of the buffer.
func (b *ByteBuffer) Data() []byte {
return b.buf[b.off:b.len]
}
func (b *ByteBuffer) AllData() []byte {
return b.buf[0:b.len]
}
// NewByteBufferFromArray creates and initializes a new ByteBuffer
// with buf as its initial contents.
func NewByteBufferFromArray(buf []byte) *ByteBuffer {
b := new(ByteBuffer);
b.buf = buf;