mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2024-11-17 18:06:03 -05:00
139 lines
3.0 KiB
Go
139 lines
3.0 KiB
Go
package d2datautils
|
|
|
|
import (
|
|
"bytes"
|
|
"log"
|
|
)
|
|
|
|
// StreamWriter allows you to create a byte array by streaming in writes of various sizes
|
|
type StreamWriter struct {
|
|
data *bytes.Buffer
|
|
bitOffset int
|
|
bitCache byte
|
|
}
|
|
|
|
// CreateStreamWriter creates a new StreamWriter instance
|
|
func CreateStreamWriter() *StreamWriter {
|
|
result := &StreamWriter{
|
|
data: new(bytes.Buffer),
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
// GetBytes returns the the byte slice of the underlying data
|
|
func (v *StreamWriter) GetBytes() []byte {
|
|
return v.data.Bytes()
|
|
}
|
|
|
|
// PushBytes writes a bytes to the stream
|
|
func (v *StreamWriter) PushBytes(b ...byte) {
|
|
for _, i := range b {
|
|
v.data.WriteByte(i)
|
|
}
|
|
}
|
|
|
|
// PushBit pushes single bit into stream
|
|
// WARNING: if you'll use PushBit, offset'll be less than 8, and if you'll
|
|
// use another Push... method, bits'll not be pushed
|
|
func (v *StreamWriter) PushBit(b bool) {
|
|
if b {
|
|
v.bitCache |= 1 << v.bitOffset
|
|
}
|
|
v.bitOffset++
|
|
|
|
if v.bitOffset != bitsPerByte {
|
|
return
|
|
}
|
|
|
|
v.PushBytes(v.bitCache)
|
|
v.bitCache = 0
|
|
v.bitOffset = 0
|
|
}
|
|
|
|
// PushBits pushes bits (with max range 8)
|
|
func (v *StreamWriter) PushBits(b byte, bits int) {
|
|
if bits > bitsPerByte {
|
|
log.Print("input bits number must be less (or equal) than 8")
|
|
}
|
|
|
|
val := b
|
|
|
|
for i := 0; i < bits; i++ {
|
|
v.PushBit(val&1 == 1)
|
|
val >>= 1
|
|
}
|
|
}
|
|
|
|
// PushBits16 pushes bits (with max range 16)
|
|
func (v *StreamWriter) PushBits16(b uint16, bits int) {
|
|
if bits > bitsPerByte*bytesPerint16 {
|
|
log.Print("input bits number must be less (or equal) than 16")
|
|
}
|
|
|
|
val := b
|
|
|
|
for i := 0; i < bits; i++ {
|
|
v.PushBit(val&1 == 1)
|
|
val >>= 1
|
|
}
|
|
}
|
|
|
|
// PushBits32 pushes bits (with max range 32)
|
|
func (v *StreamWriter) PushBits32(b uint32, bits int) {
|
|
if bits > bitsPerByte*bytesPerint32 {
|
|
log.Print("input bits number must be less (or equal) than 32")
|
|
}
|
|
|
|
val := b
|
|
|
|
for i := 0; i < bits; i++ {
|
|
v.PushBit(val&1 == 1)
|
|
val >>= 1
|
|
}
|
|
}
|
|
|
|
// PushInt16 writes a int16 word to the stream
|
|
func (v *StreamWriter) PushInt16(val int16) {
|
|
v.PushUint16(uint16(val))
|
|
}
|
|
|
|
// PushUint16 writes an uint16 word to the stream
|
|
//nolint
|
|
func (v *StreamWriter) PushUint16(val uint16) {
|
|
v.data.WriteByte(byte(val))
|
|
v.data.WriteByte(byte(val >> 8))
|
|
}
|
|
|
|
// PushInt32 writes a int32 dword to the stream
|
|
func (v *StreamWriter) PushInt32(val int32) {
|
|
v.PushUint32(uint32(val))
|
|
}
|
|
|
|
// PushUint32 writes a uint32 dword to the stream
|
|
//nolint
|
|
func (v *StreamWriter) PushUint32(val uint32) {
|
|
v.data.WriteByte(byte(val))
|
|
v.data.WriteByte(byte(val >> 8))
|
|
v.data.WriteByte(byte(val >> 16))
|
|
v.data.WriteByte(byte(val >> 24))
|
|
}
|
|
|
|
// PushInt64 writes a uint64 qword to the stream
|
|
func (v *StreamWriter) PushInt64(val int64) {
|
|
v.PushUint64(uint64(val))
|
|
}
|
|
|
|
// PushUint64 writes a uint64 qword to the stream
|
|
//nolint
|
|
func (v *StreamWriter) PushUint64(val uint64) {
|
|
v.data.WriteByte(byte(val))
|
|
v.data.WriteByte(byte(val >> 8))
|
|
v.data.WriteByte(byte(val >> 16))
|
|
v.data.WriteByte(byte(val >> 24))
|
|
v.data.WriteByte(byte(val >> 32))
|
|
v.data.WriteByte(byte(val >> 40))
|
|
v.data.WriteByte(byte(val >> 48))
|
|
v.data.WriteByte(byte(val >> 56))
|
|
}
|