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// 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 sym
import (
"bufio";
"io";
"log";
"os";
"reflect";
)
type byteOrder interface {
Uint16(b []byte) uint16;
Uint32(b []byte) uint32;
Uint64(b []byte) uint64;
String() string;
}
type olsb struct {}
func (olsb) Uint16(b []byte) uint16 {
return uint16(b[0]) | uint16(b[1]) << 8;
}
func (olsb) Uint32(b []byte) uint32 {
return uint32(b[0]) | uint32(b[1]) << 8 | uint32(b[2]) << 16 | uint32(b[3]) << 24;
}
func (olsb) Uint64(b []byte) uint64 {
return uint64(b[0]) | uint64(b[1]) << 8 | uint64(b[2]) << 16 | uint64(b[3]) << 24 | uint64(b[4]) << 32 | uint64(b[5]) << 40 | uint64(b[6]) << 48 | uint64(b[7]) << 56;
}
func (olsb) String() string {
return "LSB";
}
type omsb struct {}
func (omsb) Uint16(b []byte) uint16 {
return uint16(b[1]) | uint16(b[0]) << 8;
}
func (omsb) Uint32(b []byte) uint32 {
return uint32(b[3]) | uint32(b[2]) << 8 | uint32(b[1]) << 16 | uint32(b[0]) << 24;
}
func (omsb) Uint64(b []byte) uint64 {
return uint64(b[7]) | uint64(b[6]) << 8 | uint64(b[5]) << 16 | uint64(b[4]) << 24 | uint64(b[3]) << 32 | uint64(b[2]) << 40 | uint64(b[1]) << 48 | uint64(b[0]) << 56;
}
func (omsb) String() string {
return "MSB";
}
var (
lsb = olsb{};
msb = omsb{};
)
// A binaryReader decodes binary data from another reader. On an
// error, the Read methods simply return 0 and record the error, to
// make it more convenient to decode long sequences of binary data.
// The caller should use the Error method when convenient to check
// for errors.
type binaryReader struct {
*bufio.Reader;
err os.Error;
order byteOrder;
}
// newBinaryReader creates a new binary data reader backed by the
// given reader and using the given byte order for decoding.
func newBinaryReader(r io.Reader, o byteOrder) *binaryReader {
return &binaryReader{bufio.NewReader(r), nil, o};
}
// Error returns the recorded error, or nil if no error has occurred.
func (r *binaryReader) Error() os.Error {
return r.err;
}
func (r *binaryReader) ReadUint8() uint8 {
var buf [1]byte;
n, err := io.ReadFull(r.Reader, &buf);
if r.err == nil && err != nil {
r.err = err;
}
return buf[0];
}
func (r *binaryReader) ReadUint16() uint16 {
var buf [2]byte;
n, err := io.ReadFull(r.Reader, &buf);
if r.err == nil && err != nil {
r.err = err;
}
return r.order.Uint16(&buf);
}
func (r *binaryReader) ReadUint32() uint32 {
var buf [4]byte;
n, err := io.ReadFull(r.Reader, &buf);
if r.err == nil && err != nil {
r.err = err;
}
return r.order.Uint32(&buf);
}
func (r *binaryReader) ReadUint64() uint64 {
var buf [8]byte;
n, err := io.ReadFull(r.Reader, &buf);
if r.err == nil && err != nil {
r.err = err;
}
return r.order.Uint64(&buf);
}
func (r *binaryReader) ReadInt8() int8 {
return int8(r.ReadUint8());
}
func (r *binaryReader) ReadInt16() int16 {
return int16(r.ReadUint16());
}
func (r *binaryReader) ReadInt32() int32 {
return int32(r.ReadUint32());
}
func (r *binaryReader) ReadInt64() int64 {
return int64(r.ReadUint64());
}
// ReadCString reads a NULL-terminated string.
func (r *binaryReader) ReadCString() string {
str, err := r.Reader.ReadLineString('\x00', false);
if r.err == nil && err != nil {
r.err = err;
}
return str;
}
// ReadValue reads a value according to its reflected type. This can
// read any of the types for which there is a regular Read method,
// plus structs and arrays. It assumes structs contain no padding.
func (r *binaryReader) ReadValue(v reflect.Value) {
switch v := v.(type) {
case *reflect.ArrayValue:
l := v.Len();
for i := 0; i < l; i++ {
r.ReadValue(v.Elem(i));
}
case *reflect.StructValue:
l := v.NumField();
for i := 0; i < l; i++ {
r.ReadValue(v.Field(i));
}
case *reflect.Uint8Value:
v.Set(r.ReadUint8());
case *reflect.Uint16Value:
v.Set(r.ReadUint16());
case *reflect.Uint32Value:
v.Set(r.ReadUint32());
case *reflect.Uint64Value:
v.Set(r.ReadUint64());
case *reflect.Int8Value:
v.Set(r.ReadInt8());
case *reflect.Int16Value:
v.Set(r.ReadInt16());
case *reflect.Int32Value:
v.Set(r.ReadInt32());
case *reflect.Int64Value:
v.Set(r.ReadInt64());
case *reflect.StringValue:
v.Set(r.ReadCString());
default:
log.Crashf("Value of unexpected type %T", v);
}
}
// ReadAny is a convenience wrapper for ReadValue. It can be passed a
// pointer any type that can be decoded by ReadValue.
func (r *binaryReader) ReadAny(out interface {}) {
r.ReadValue(reflect.Indirect(reflect.NewValue(out)));
}
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