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Code Issues Releases Wiki Activity

Refactor StreamReader

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This commit is contained in:
Intyre 2020-12-23 10:40:13 +01:00
parent b78dca52c2
commit 1e91df996c
1 changed files with 38 additions and 82 deletions
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120
d2common/d2datautils/stream_reader.go
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@ -4,12 +4,6 @@ import (
"io"
)
const (
bytesPerInt16 = 2
bytesPerInt32 = 4
bytesPerInt64 = 8
)
// StreamReader allows you to read data from a byte array in various formats
type StreamReader struct {
data []byte
@ -26,16 +20,6 @@ func CreateStreamReader(source []byte) *StreamReader {
return result
}
// GetPosition returns the current stream position
func (v *StreamReader) GetPosition() uint64 {
return v.position
}
// GetSize returns the total size of the stream in bytes
func (v *StreamReader) GetSize() uint64 {
return uint64(len(v.data))
}
// GetByte returns a byte from the stream
func (v *StreamReader) GetByte() byte {
result := v.data[v.position]
@ -44,32 +28,46 @@ func (v *StreamReader) GetByte() byte {
return result
}
// GetUInt16 returns a uint16 word from the stream
func (v *StreamReader) GetUInt16() uint16 {
var result uint16
for offset := uint64(0); offset < bytesPerInt16; offset++ {
shift := uint8(bitsPerByte * offset)
result += uint16(v.data[v.position+offset]) << shift
}
v.position += bytesPerInt16
return result
}
// GetInt16 returns a int16 word from the stream
func (v *StreamReader) GetInt16() int16 {
var result int16
return int16(v.GetUInt16())
}
for offset := uint64(0); offset < bytesPerInt16; offset++ {
shift := uint8(bitsPerByte * offset)
result += int16(v.data[v.position+offset]) << shift
}
// GetUInt16 returns a uint16 word from the stream
//nolint
func (v *StreamReader) GetUInt16() uint16 {
b := v.ReadBytes(2)
return uint16(b[0]) | uint16(b[1])<<8
}
v.position += bytesPerInt16
// GetInt32 returns an int32 dword from the stream
func (v *StreamReader) GetInt32() int32 {
return int32(v.GetUInt32())
}
return result
// GetUInt32 returns a uint32 dword from the stream
//nolint
func (v *StreamReader) GetUInt32() uint32 {
b := v.ReadBytes(4)
return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
}
// GetInt64 returns a uint64 qword from the stream
func (v *StreamReader) GetInt64() int64 {
return int64(v.GetUInt64())
}
// GetUInt64 returns a uint64 qword from the stream
//nolint
func (v *StreamReader) GetUInt64() uint64 {
b := v.ReadBytes(8)
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
}
// GetPosition returns the current stream position
func (v *StreamReader) GetPosition() uint64 {
return v.position
}
// SetPosition sets the stream position with the given position
@ -77,51 +75,9 @@ func (v *StreamReader) SetPosition(newPosition uint64) {
v.position = newPosition
}
// GetUInt32 returns a uint32 dword from the stream
func (v *StreamReader) GetUInt32() uint32 {
var result uint32
for offset := uint64(0); offset < bytesPerInt32; offset++ {
shift := uint8(bitsPerByte * offset)
result += uint32(v.data[v.position+offset]) << shift
}
v.position += bytesPerInt32
return result
}
// GetInt32 returns an int32 dword from the stream
func (v *StreamReader) GetInt32() int32 {
var result int32
for offset := uint64(0); offset < bytesPerInt32; offset++ {
shift := uint8(bitsPerByte * offset)
result += int32(v.data[v.position+offset]) << shift
}
v.position += bytesPerInt32
return result
}
// GetUint64 returns a uint64 qword from the stream
func (v *StreamReader) GetUint64() uint64 {
var result uint64
for offset := uint64(0); offset < bytesPerInt64; offset++ {
shift := uint8(bitsPerByte * offset)
result += uint64(v.data[v.position+offset]) << shift
}
v.position += bytesPerInt64
return result
}
// GetInt64 returns a uint64 qword from the stream
func (v *StreamReader) GetInt64() int64 {
return int64(v.GetUint64())
// GetSize returns the total size of the stream in bytes
func (v *StreamReader) GetSize() uint64 {
return uint64(len(v.data))
}
// ReadByte implements io.ByteReader