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binarystream.go
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binarystream.go
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package unpack
import (
"encoding/binary"
"io"
)
type BinaryStream struct {
baseStream io.ReadWriteSeeker
bigEndian bool
}
func NewBinaryStream(baseStream io.ReadWriteSeeker, bigEndian bool) *BinaryStream {
return &BinaryStream{
baseStream: baseStream,
bigEndian: bigEndian,
}
}
// Comment functions
func (bs *BinaryStream) Position() int64 {
position, _ := bs.baseStream.Seek(0, io.SeekCurrent)
return position
}
func (bs *BinaryStream) SetPosition(position int64) {
bs.baseStream.Seek(position, io.SeekStart)
}
func (bs *BinaryStream) BytesAvailable() int64 {
eof, _ := bs.baseStream.Seek(0, io.SeekEnd)
position := bs.Position()
bs.baseStream.Seek(position, io.SeekStart)
return eof - position
}
// Write functions
func (bs *BinaryStream) writeBytes(data []byte) {
bs.baseStream.Write(data)
}
func (bs *BinaryStream) writeValue(format string, data interface{}) {
var byteOrder binary.ByteOrder
if bs.bigEndian {
byteOrder = binary.BigEndian
} else {
byteOrder = binary.LittleEndian
}
binary.Write(bs.baseStream, byteOrder, data)
}
func (bs *BinaryStream) WriteBool(value bool) {
if value {
bs.WriteChar(1)
} else {
bs.WriteChar(0)
}
}
func (bs *BinaryStream) WriteChar(value int8) {
bs.writeValue("b", value)
}
func (bs *BinaryStream) WriteUchar(value uint8) {
bs.writeValue("B", value)
}
func (bs *BinaryStream) WriteInt16(value int16) {
bs.writeValue("h", value)
}
func (bs *BinaryStream) WriteUint16(value uint16) {
bs.writeValue("H", value)
}
func (bs *BinaryStream) WriteInt32(value int32) {
bs.writeValue("i", value)
}
func (bs *BinaryStream) WriteUint32(value uint32) {
bs.writeValue("I", value)
}
func (bs *BinaryStream) WriteInt64(value int64) {
bs.writeValue("q", value)
}
func (bs *BinaryStream) WriteUint64(value uint64) {
bs.writeValue("Q", value)
}
func (bs *BinaryStream) WriteFloat32(value float32) {
bs.writeValue("f", value)
}
func (bs *BinaryStream) WriteFloat64(value float64) {
bs.writeValue("d", value)
}
func (bs *BinaryStream) WriteString(value string) {
length := uint16(len(value))
bs.WriteUint16(length)
bs.writeBytes([]byte(value))
}
// Read functions
func (bs *BinaryStream) readValue(format string, data interface{}) {
var byteOrder binary.ByteOrder
if bs.bigEndian {
byteOrder = binary.BigEndian
} else {
byteOrder = binary.LittleEndian
}
binary.Read(bs.baseStream, byteOrder, data)
}
func (bs *BinaryStream) ReadBool() bool {
var value int8
bs.readValue("b", &value)
return value == 1
}
func (bs *BinaryStream) ReadChar() int8 {
var value int8
bs.readValue("b", &value)
return value
}
func (bs *BinaryStream) ReadUchar() uint8 {
var value uint8
bs.readValue("B", &value)
return value
}
func (bs *BinaryStream) ReadInt16() int16 {
var value int16
bs.readValue("h", &value)
return value
}
func (bs *BinaryStream) ReadUint16() uint16 {
var value uint16
bs.readValue("H", &value)
return value
}
func (bs *BinaryStream) ReadInt32() int32 {
var value int32
bs.readValue("i", &value)
return value
}
func (bs *BinaryStream) ReadUint32() uint32 {
var value uint32
bs.readValue("I", &value)
return value
}
func (bs *BinaryStream) ReadInt64() int64 {
var value int64
bs.readValue("q", &value)
return value
}
func (bs *BinaryStream) ReadUint64() uint64 {
var value uint64
bs.readValue("Q", &value)
return value
}
func (bs *BinaryStream) ReadFloat32() float32 {
var value float32
bs.readValue("f", &value)
return value
}
func (bs *BinaryStream) ReadFloat64() float64 {
var value float64
bs.readValue("d", &value)
return value
}
func (bs *BinaryStream) ReadString() string {
length := bs.ReadUint16()
data := make([]byte, length)
bs.baseStream.Read(data)
return string(data)
}
func (bs *BinaryStream) ReadBytes(length int) []byte {
data := make([]byte, length)
bs.ReadBytesIntoBuffer(data)
return data
}
func (bs *BinaryStream) ReadBytesIntoBuffer(buffer []byte) {
_, err := io.ReadFull(bs.baseStream, buffer)
if err != nil {
panic(err)
}
}
func (bs *BinaryStream) Seek(position int64, whence int) (int64, error) {
return bs.baseStream.Seek(position, whence)
}
func (bs *BinaryStream) ReadShort() int16 {
var value int16
bs.readValue("h", &value)
return value
}