make a (rudimentary) ByteBuffer and put it in package "io".
fix up protocol buffers to use it.
R=rsc
DELTA=1232 (612 added, 572 deleted, 48 changed)
OCL=19964
CL=19981
diff --git a/src/lib/io/Makefile b/src/lib/io/Makefile
new file mode 100644
index 0000000..39640d16
--- /dev/null
+++ b/src/lib/io/Makefile
@@ -0,0 +1,56 @@
+# 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.
+
+# DO NOT EDIT. Automatically generated by gobuild.
+# gobuild -m >Makefile
+O=6
+GC=$(O)g
+CC=$(O)c -w
+AS=$(O)a
+AR=$(O)ar
+
+default: packages
+
+clean:
+ rm -f *.$O *.a $O.out
+
+test: packages
+ gotest
+
+coverage: packages
+ gotest
+ 6cov -g `pwd` | grep -v '_test\.go:'
+
+%.$O: %.go
+ $(GC) $*.go
+
+%.$O: %.c
+ $(CC) $*.c
+
+%.$O: %.s
+ $(AS) $*.s
+
+O1=\
+ io.$O\
+ bytebuffer.$O\
+
+io.a: a1
+
+a1: $(O1)
+ $(AR) grc io.a io.$O bytebuffer.$O
+ rm -f $(O1)
+
+newpkg: clean
+ $(AR) grc io.a
+
+$(O1): newpkg
+
+nuke: clean
+ rm -f $(GOROOT)/pkg/io.a
+
+packages: io.a
+
+install: packages
+ cp io.a $(GOROOT)/pkg/io.a
+
diff --git a/src/lib/io/bytebuffer.go b/src/lib/io/bytebuffer.go
new file mode 100644
index 0000000..9035367
--- /dev/null
+++ b/src/lib/io/bytebuffer.go
@@ -0,0 +1,90 @@
+// 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
+
+// Byte buffer for marshaling nested messages.
+
+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.
+
+func bytecopy(dst *[]byte, doff int, src *[]byte, soff int, count int) {
+ for i := 0; i < count; i++ {
+ dst[doff] = src[soff];
+ doff++;
+ soff++;
+ }
+}
+
+export type ByteBuffer struct {
+ buf *[]byte;
+ off int; // Read from here
+ len int; // Write to here
+ cap int;
+}
+
+func (b *ByteBuffer) Reset() {
+ b.off = 0;
+ b.len = 0;
+}
+
+func (b *ByteBuffer) Write(p *[]byte) (n int, err *os.Error) {
+ plen := len(p);
+ if b.buf == nil {
+ b.cap = plen + 1024;
+ b.buf = new([]byte, b.cap);
+ b.len = 0;
+ }
+ if b.len + len(p) > b.cap {
+ b.cap = 2*(b.cap + plen);
+ nb := new([]byte, b.cap);
+ bytecopy(nb, 0, b.buf, 0, b.len);
+ b.buf = nb;
+ }
+ bytecopy(b.buf, b.len, p, 0, plen);
+ b.len += plen;
+ return plen, nil;
+}
+
+func (b *ByteBuffer) Read(p *[]byte) (n int, err *os.Error) {
+ plen := len(p);
+ if b.buf == nil {
+ return 0, nil
+ }
+ if b.off == b.len { // empty buffer
+ b.Reset();
+ return 0, nil
+ }
+ if plen > b.len - b.off {
+ plen = b.len - b.off
+ }
+ bytecopy(p, 0, b.buf, b.off, plen);
+ b.off += plen;
+ return plen, nil;
+}
+
+func (b *ByteBuffer) Len() int {
+ return b.len
+}
+
+func (b *ByteBuffer) Data() *[]byte {
+ return b.buf[b.off:b.len]
+}
+
+
+export func NewByteBufferFromArray(buf *[]byte) *ByteBuffer {
+ b := new(ByteBuffer);
+ b.buf = buf;
+ b.off = 0;
+ b.len = len(buf);
+ b.cap = len(buf);
+ return b;
+}
diff --git a/src/lib/io/io.go b/src/lib/io/io.go
new file mode 100644
index 0000000..9ae9264
--- /dev/null
+++ b/src/lib/io/io.go
@@ -0,0 +1,146 @@
+// 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
+
+import (
+ "os";
+ "syscall";
+)
+
+export var ErrEOF = os.NewError("EOF")
+
+export type Read interface {
+ Read(p *[]byte) (n int, err *os.Error);
+}
+
+export type Write interface {
+ Write(p *[]byte) (n int, err *os.Error);
+}
+
+export type ReadWrite interface {
+ Read(p *[]byte) (n int, err *os.Error);
+ Write(p *[]byte) (n int, err *os.Error);
+}
+
+export type ReadWriteClose interface {
+ Read(p *[]byte) (n int, err *os.Error);
+ Write(p *[]byte) (n int, err *os.Error);
+ Close() *os.Error;
+}
+
+export func WriteString(w Write, s string) (n int, err *os.Error) {
+ b := new([]byte, len(s)+1);
+ if !syscall.StringToBytes(b, s) {
+ return -1, os.EINVAL
+ }
+ // BUG return w.Write(b[0:len(s)])
+ r, e := w.Write(b[0:len(s)]);
+ return r, e
+}
+
+// Read until buffer is full, EOF, or error
+export func Readn(fd Read, buf *[]byte) (n int, err *os.Error) {
+ n = 0;
+ for n < len(buf) {
+ nn, e := fd.Read(buf[n:len(buf)]);
+ if nn > 0 {
+ n += nn
+ }
+ if e != nil {
+ return n, e
+ }
+ if nn <= 0 {
+ return n, ErrEOF // no error but insufficient data
+ }
+ }
+ return n, nil
+}
+
+// Convert something that implements Read into something
+// whose Reads are always Readn
+type FullRead struct {
+ fd Read;
+}
+
+func (fd *FullRead) Read(p *[]byte) (n int, err *os.Error) {
+ n, err = Readn(fd.fd, p);
+ return n, err
+}
+
+export func MakeFullReader(fd Read) Read {
+ if fr, ok := fd.(*FullRead); ok {
+ // already a FullRead
+ return fd
+ }
+ return &FullRead{fd}
+}
+
+// Copies n bytes (or until EOF is reached) from src to dst.
+// Returns the number of bytes copied and the error, if any.
+export func Copyn(src Read, dst Write, n int64) (written int64, err *os.Error) {
+ buf := new([]byte, 32*1024);
+ for written < n {
+ l := len(buf);
+ if d := n - written; d < int64(l) {
+ l = int(d);
+ }
+ nr, er := src.Read(buf[0 : l]);
+ if nr > 0 {
+ nw, ew := dst.Write(buf[0 : nr]);
+ if nw > 0 {
+ written += int64(nw);
+ }
+ if ew != nil {
+ err = ew;
+ break;
+ }
+ if nr != nw {
+ err = os.EIO;
+ break;
+ }
+ }
+ if er != nil {
+ err = er;
+ break;
+ }
+ if nr == 0 {
+ err = ErrEOF;
+ break;
+ }
+ }
+ return written, err
+}
+
+// Copies from src to dst until EOF is reached.
+// Returns the number of bytes copied and the error, if any.
+export func Copy(src Read, dst Write) (written int64, err *os.Error) {
+ buf := new([]byte, 32*1024);
+ for {
+ nr, er := src.Read(buf);
+ if nr > 0 {
+ nw, ew := dst.Write(buf[0:nr]);
+ if nw > 0 {
+ written += int64(nw);
+ }
+ if ew != nil {
+ err = ew;
+ break;
+ }
+ if nr != nw {
+ err = os.EIO;
+ break;
+ }
+ }
+ if er != nil {
+ err = er;
+ break;
+ }
+ if nr == 0 {
+ break;
+ }
+ }
+ return written, err
+}
+
