First Commit

analyzer/utils/bytebuffer.go

@@ -0,0 +1,99 @@
+package utils
+
+import "bytes"
+
+type ByteBuffer struct {
+	Buf []byte
+}
+
+func (b *ByteBuffer) Append(data []byte) {
+	b.Buf = append(b.Buf, data...)
+}
+
+func (b *ByteBuffer) Len() int {
+	return len(b.Buf)
+}
+
+func (b *ByteBuffer) Index(sep []byte) int {
+	return bytes.Index(b.Buf, sep)
+}
+
+func (b *ByteBuffer) Get(length int, consume bool) (data []byte, ok bool) {
+	if len(b.Buf) < length {
+		return nil, false
+	}
+	data = b.Buf[:length]
+	if consume {
+		b.Buf = b.Buf[length:]
+	}
+	return data, true
+}
+
+func (b *ByteBuffer) GetString(length int, consume bool) (string, bool) {
+	data, ok := b.Get(length, consume)
+	if !ok {
+		return "", false
+	}
+	return string(data), true
+}
+
+func (b *ByteBuffer) GetByte(consume bool) (byte, bool) {
+	data, ok := b.Get(1, consume)
+	if !ok {
+		return 0, false
+	}
+	return data[0], true
+}
+
+func (b *ByteBuffer) GetUint16(littleEndian, consume bool) (uint16, bool) {
+	data, ok := b.Get(2, consume)
+	if !ok {
+		return 0, false
+	}
+	if littleEndian {
+		return uint16(data[0]) | uint16(data[1])<<8, true
+	}
+	return uint16(data[1]) | uint16(data[0])<<8, true
+}
+
+func (b *ByteBuffer) GetUint32(littleEndian, consume bool) (uint32, bool) {
+	data, ok := b.Get(4, consume)
+	if !ok {
+		return 0, false
+	}
+	if littleEndian {
+		return uint32(data[0]) | uint32(data[1])<<8 | uint32(data[2])<<16 | uint32(data[3])<<24, true
+	}
+	return uint32(data[3]) | uint32(data[2])<<8 | uint32(data[1])<<16 | uint32(data[0])<<24, true
+}
+
+func (b *ByteBuffer) GetUntil(sep []byte, includeSep, consume bool) (data []byte, ok bool) {
+	index := b.Index(sep)
+	if index == -1 {
+		return nil, false
+	}
+	if includeSep {
+		index += len(sep)
+	}
+	return b.Get(index, consume)
+}
+
+func (b *ByteBuffer) GetSubBuffer(length int, consume bool) (sub *ByteBuffer, ok bool) {
+	data, ok := b.Get(length, consume)
+	if !ok {
+		return nil, false
+	}
+	return &ByteBuffer{Buf: data}, true
+}
+
+func (b *ByteBuffer) Skip(length int) bool {
+	if len(b.Buf) < length {
+		return false
+	}
+	b.Buf = b.Buf[length:]
+	return true
+}
+
+func (b *ByteBuffer) Reset() {
+	b.Buf = nil
+}