69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package d2datautils
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import "bytes"
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const (
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byteMask = 0xFF
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)
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// StreamWriter allows you to create a byte array by streaming in writes of various sizes
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type StreamWriter struct {
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data *bytes.Buffer
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}
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// CreateStreamWriter creates a new StreamWriter instance
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func CreateStreamWriter() *StreamWriter {
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result := &StreamWriter{
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data: new(bytes.Buffer),
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}
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return result
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}
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// PushByte writes a byte to the stream
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func (v *StreamWriter) PushByte(val byte) {
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v.data.WriteByte(val)
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}
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// PushUint16 writes an uint16 word to the stream
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func (v *StreamWriter) PushUint16(val uint16) {
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for count := 0; count < bytesPerInt16; count++ {
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shift := count * bitsPerByte
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v.data.WriteByte(byte(val>>shift) & byteMask)
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}
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}
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// PushInt16 writes a int16 word to the stream
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func (v *StreamWriter) PushInt16(val int16) {
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for count := 0; count < bytesPerInt16; count++ {
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shift := count * bitsPerByte
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v.data.WriteByte(byte(val>>shift) & byteMask)
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}
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}
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// PushUint32 writes a uint32 dword to the stream
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func (v *StreamWriter) PushUint32(val uint32) {
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for count := 0; count < bytesPerInt32; count++ {
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shift := count * bitsPerByte
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v.data.WriteByte(byte(val>>shift) & byteMask)
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}
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}
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// PushUint64 writes a uint64 qword to the stream
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func (v *StreamWriter) PushUint64(val uint64) {
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for count := 0; count < bytesPerInt64; count++ {
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shift := count * bitsPerByte
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v.data.WriteByte(byte(val>>shift) & byteMask)
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}
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}
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// PushInt64 writes a uint64 qword to the stream
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func (v *StreamWriter) PushInt64(val int64) {
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v.PushUint64(uint64(val))
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}
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// GetBytes returns the the byte slice of the underlying data
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func (v *StreamWriter) GetBytes() []byte {
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return v.data.Bytes()
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}
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