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langhuihui
269
util/big_little_endian.go
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269
util/big_little_endian.go
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package util
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//
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// 注意:RTMP模式下都是大端模式
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//
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var LittleEndian littleEndian
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// BigEndian is the big-endian implementation of ByteOrder.
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var BigEndian bigEndian
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// 低位字节排放在内存的低地址端,高位字节排放在内存的高地址端.
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type littleEndian struct{}
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// b == 0x1234, b[0] == 0x12, b[1] == 0x34
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// b[0]低字节 b[1]高字节
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// 内存地址 低 -> 高
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// 0x34 0x12
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// byte(v)低字节 b[0]内存低地址
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// byte(v>>8)高字节 b[1]内存高地址
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// b == 2222 2222 1111 1111
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// b >> 8 -> 0000 0000 2222 2222
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// b << 8 -> 1111 1111 0000 0000
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func (littleEndian) Uint16(b []byte) uint16 { return uint16(b[0]) | uint16(b[1])<<8 }
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func (littleEndian) Uint24(b []byte) uint32 { return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 }
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func (littleEndian) Uint32(b []byte) uint32 {
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return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
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}
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func (littleEndian) Uint40(b []byte) uint64 {
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return uint64(b[0]) | uint64(b[1])<<8 |
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uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32
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}
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func (littleEndian) Uint48(b []byte) uint64 {
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 |
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uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40
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}
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func (littleEndian) Uint64(b []byte) uint64 {
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
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uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
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}
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//
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// Put
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//
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func (littleEndian) PutUint16(b []byte, v uint16) {
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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}
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func (littleEndian) PutUint24(b []byte, v uint32) {
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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}
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func (littleEndian) PutUint32(b []byte, v uint32) {
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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}
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func (littleEndian) PutUint64(b []byte, v uint64) {
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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b[4] = byte(v >> 32)
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b[5] = byte(v >> 40)
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b[6] = byte(v >> 48)
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b[7] = byte(v >> 56)
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}
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//
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// To
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//
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func (littleEndian) ToUint16(v uint16) []byte {
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b := make([]byte, 2)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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return b
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}
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func (littleEndian) ToUint24(v uint32) []byte {
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b := make([]byte, 3)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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return b
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}
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func (littleEndian) ToUint32(v uint32) []byte {
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b := make([]byte, 4)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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return b
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}
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func (littleEndian) ToUint40(v uint64) []byte {
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b := make([]byte, 5)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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b[4] = byte(v >> 32)
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return b
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}
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func (littleEndian) ToUint48(v uint64) []byte {
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b := make([]byte, 6)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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b[4] = byte(v >> 32)
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b[5] = byte(v >> 40)
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return b
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}
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func (littleEndian) ToUint64(v uint64) []byte {
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b := make([]byte, 8)
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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b[4] = byte(v >> 32)
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b[5] = byte(v >> 40)
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b[6] = byte(v >> 48)
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b[7] = byte(v >> 56)
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return b
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}
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// 高位字节排放在内存的低地址端,低位字节排放在内存的高地址端
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type bigEndian struct{}
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// b == 0x1234, b[0] == 0x12, b[1] == 0x34
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// 内存地址 低 -> 高
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// 0x12 0x34
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func (bigEndian) Uint16(b []byte) uint16 { return uint16(b[1]) | uint16(b[0])<<8 }
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func (bigEndian) Uint24(b []byte) uint32 { return uint32(b[2]) | uint32(b[1])<<8 | uint32(b[0])<<16 }
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func (bigEndian) Uint32(b []byte) uint32 {
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return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
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}
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func (bigEndian) Uint40(b []byte) uint64 {
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return uint64(b[4]) | uint64(b[3])<<8 |
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uint64(b[2])<<16 | uint64(b[1])<<24 | uint64(b[0])<<32
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}
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func (bigEndian) Uint48(b []byte) uint64 {
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return uint64(b[5]) | uint64(b[4])<<8 | uint64(b[3])<<16 |
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uint64(b[2])<<24 | uint64(b[1])<<32 | uint64(b[0])<<40
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}
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func (bigEndian) Uint64(b []byte) uint64 {
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return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
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uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
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}
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//
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// Put
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//
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func (bigEndian) PutUint16(b []byte, v uint16) {
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b[0] = byte(v >> 8)
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b[1] = byte(v)
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}
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func (bigEndian) PutUint24(b []byte, v uint32) {
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b[0] = byte(v >> 16)
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b[1] = byte(v >> 8)
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b[2] = byte(v)
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}
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func (bigEndian) PutUint32(b []byte, v uint32) {
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b[0] = byte(v >> 24)
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b[1] = byte(v >> 16)
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b[2] = byte(v >> 8)
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b[3] = byte(v)
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}
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func (bigEndian) PutUint64(b []byte, v uint64) {
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b[0] = byte(v >> 56)
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b[1] = byte(v >> 48)
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b[2] = byte(v >> 40)
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b[3] = byte(v >> 32)
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b[4] = byte(v >> 24)
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b[5] = byte(v >> 16)
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b[6] = byte(v >> 8)
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b[7] = byte(v)
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}
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//
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// To
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//
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func (bigEndian) ToUint16(v uint16) []byte {
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b := make([]byte, 2)
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b[0] = byte(v >> 8)
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b[1] = byte(v)
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return b
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}
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func (bigEndian) ToUint24(v uint32) []byte {
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b := make([]byte, 3)
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b[0] = byte(v >> 16)
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b[1] = byte(v >> 8)
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b[2] = byte(v)
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return b
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}
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func (bigEndian) ToUint32(v uint32) []byte {
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b := make([]byte, 4)
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b[0] = byte(v >> 24)
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b[1] = byte(v >> 16)
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b[2] = byte(v >> 8)
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b[3] = byte(v)
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return b
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}
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func (bigEndian) ToUint40(v uint64) []byte {
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b := make([]byte, 5)
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b[0] = byte(v >> 32)
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b[1] = byte(v >> 24)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 8)
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b[4] = byte(v)
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return b
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}
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func (bigEndian) ToUint48(v uint64) []byte {
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b := make([]byte, 6)
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b[0] = byte(v >> 40)
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b[1] = byte(v >> 32)
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b[2] = byte(v >> 24)
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b[3] = byte(v >> 16)
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b[4] = byte(v >> 8)
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b[5] = byte(v)
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return b
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}
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func (bigEndian) ToUint64(v uint64) []byte {
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b := make([]byte, 8)
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b[0] = byte(v >> 56)
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b[1] = byte(v >> 48)
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b[2] = byte(v >> 40)
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b[3] = byte(v >> 32)
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b[4] = byte(v >> 24)
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b[5] = byte(v >> 16)
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b[6] = byte(v >> 8)
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b[7] = byte(v)
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return b
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}
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//哥伦布解码
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func GetUev(buff []byte, start int) (value int, pos int) {
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l := len(buff)
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var nZeroNum uint = 0
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for start < l*8 {
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if (buff[start/8] & (0x80 >> uint(start%8))) > 0 {
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break
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}
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nZeroNum += 1
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start += 1
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}
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dwRet := 0
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start += 1
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var i uint
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for i = 0; i < nZeroNum; i++ {
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dwRet <<= 1
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if (buff[start/8] & (0x80 >> uint(start%8))) > 0 {
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dwRet += 1
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}
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start += 1
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}
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return (1 << nZeroNum) - 1 + dwRet, start
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}
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func BigLittleSwap(v uint) uint {
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return (v >> 24) | ((v>>16)&0xff)<<8 | ((v>>8)&0xff)<<16 | (v&0xff)<<24
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}
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