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base_type.go
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base_type.go
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package bpl
import (
"bufio"
"encoding/binary"
"io"
"reflect"
"unsafe"
"github.com/qiniu/x/log"
)
// -----------------------------------------------------------------------------
var (
tyInt = reflect.TypeOf(int(0))
tyInt8 = reflect.TypeOf(int8(0))
tyInt16 = reflect.TypeOf(int16(0))
tyInt32 = reflect.TypeOf(int32(0))
tyInt64 = reflect.TypeOf(int64(0))
tyUint = reflect.TypeOf(uint(0))
tyUint8 = reflect.TypeOf(uint8(0))
tyUint16 = reflect.TypeOf(uint16(0))
tyUint32 = reflect.TypeOf(uint32(0))
tyUint64 = reflect.TypeOf(uint64(0))
tyFloat32 = reflect.TypeOf(float32(0))
tyFloat64 = reflect.TypeOf(float64(0))
tyString = reflect.TypeOf(string(""))
tyByteSlice = reflect.TypeOf([]byte(nil))
TyInterface = reflect.TypeOf((*interface{})(nil)).Elem()
tyInterfaceSlice = reflect.SliceOf(TyInterface)
)
// -----------------------------------------------------------------------------
// A BaseType represents a matching unit of a builtin fixed size type.
//
type BaseType uint
type baseTypeInfo struct {
read func(in *bufio.Reader) (v interface{}, err error)
newn func(n int) interface{}
typ reflect.Type
sizeOf int
}
var baseTypes = [...]baseTypeInfo{
reflect.Int8: {readInt8, newInt8n, tyInt8, 1},
reflect.Int16: {readInt16, newInt16n, tyInt16, 2},
reflect.Int32: {readInt32, newInt32n, tyInt32, 4},
reflect.Int64: {readInt64, newInt64n, tyInt64, 8},
reflect.Uint8: {readUint8, newUint8n, tyUint8, 1},
reflect.Uint16: {readUint16, newUint16n, tyUint16, 2},
reflect.Uint32: {readUint32, newUint32n, tyUint32, 4},
reflect.Uint64: {readUint64, newUint64n, tyUint64, 8},
reflect.Float32: {readFloat32, newFloat32n, tyFloat32, 4},
reflect.Float64: {readFloat64, newFloat64n, tyFloat64, 8},
}
func readInt8(in *bufio.Reader) (v interface{}, err error) {
t, err := in.ReadByte()
return int8(t), err
}
func readUint8(in *bufio.Reader) (v interface{}, err error) {
return in.ReadByte()
}
func readInt16(in *bufio.Reader) (v interface{}, err error) {
t1, err := in.ReadByte()
if err != nil {
return
}
t2, err := in.ReadByte()
return (int16(t2) << 8) | int16(t1), err
}
func readUint16(in *bufio.Reader) (v interface{}, err error) {
t1, err := in.ReadByte()
if err != nil {
return
}
t2, err := in.ReadByte()
return (uint16(t2) << 8) | uint16(t1), err
}
func readInt32(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(4)
if err != nil {
return
}
v = int32(binary.LittleEndian.Uint32(t))
in.Discard(4)
return
}
func readUint32(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(4)
if err != nil {
return
}
v = binary.LittleEndian.Uint32(t)
in.Discard(4)
return
}
func readInt64(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(8)
if err != nil {
return
}
v = int64(binary.LittleEndian.Uint64(t))
in.Discard(8)
return
}
func readUint64(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(8)
if err != nil {
return
}
v = binary.LittleEndian.Uint64(t)
in.Discard(8)
return
}
func readFloat32(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(4)
if err != nil {
return
}
v = *(*float32)(unsafe.Pointer(&t[0]))
in.Discard(4)
return
}
func readFloat64(in *bufio.Reader) (v interface{}, err error) {
t, err := in.Peek(8)
if err != nil {
return
}
v = *(*float64)(unsafe.Pointer(&t[0]))
in.Discard(8)
return
}
func newInt8n(n int) interface{} {
return make([]int8, n)
}
func newUint8n(n int) interface{} {
return make([]uint8, n)
}
func newInt16n(n int) interface{} {
return make([]int16, n)
}
func newUint16n(n int) interface{} {
return make([]uint16, n)
}
func newInt32n(n int) interface{} {
return make([]int32, n)
}
func newUint32n(n int) interface{} {
return make([]uint32, n)
}
func newInt64n(n int) interface{} {
return make([]int64, n)
}
func newUint64n(n int) interface{} {
return make([]uint64, n)
}
func newFloat32n(n int) interface{} {
return make([]float32, n)
}
func newFloat64n(n int) interface{} {
return make([]float64, n)
}
// Match is required by a matching unit. see Ruler interface.
//
func (p BaseType) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
v, err = baseTypes[p].read(in)
return
}
// RetType returns matching result type.
//
func (p BaseType) RetType() reflect.Type {
return baseTypes[p].typ
}
// SizeOf is required by a matching unit. see Ruler interface.
//
func (p BaseType) SizeOf() int {
return baseTypes[p].sizeOf
}
var (
// Int8 is the matching unit for int8
Int8 = BaseType(reflect.Int8)
// Int16 is the matching unit for int16
Int16 = BaseType(reflect.Int16)
// Int32 is the matching unit for int32
Int32 = BaseType(reflect.Int32)
// Int64 is the matching unit for int64
Int64 = BaseType(reflect.Int64)
// Uint8 is the matching unit for uint8
Uint8 = BaseType(reflect.Uint8)
// Uint16 is the matching unit for uint16
Uint16 = BaseType(reflect.Uint16)
// Uint32 is the matching unit for uint32
Uint32 = BaseType(reflect.Uint32)
// Uint64 is the matching unit for uint64
Uint64 = BaseType(reflect.Uint64)
// Float32 is the matching unit for float32
Float32 = BaseType(reflect.Float32)
// Float64 is the matching unit for float64
Float64 = BaseType(reflect.Float64)
)
// -----------------------------------------------------------------------------
type cstring int
func (p cstring) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
b, err := in.ReadBytes(0)
if err != nil {
return
}
return string(b[:len(b)-1]), nil
}
func (p cstring) RetType() reflect.Type {
return tyString
}
func (p cstring) SizeOf() int {
return -1
}
// CString is a matching unit that matches a C style string.
//
var CString Ruler = cstring(0)
// -----------------------------------------------------------------------------
type charType int
func (p charType) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
return in.ReadByte()
}
func (p charType) RetType() reflect.Type {
return tyUint8
}
func (p charType) SizeOf() int {
return 1
}
// Char is a matching unit that matches a character.
//
var Char Ruler = charType(0)
// -----------------------------------------------------------------------------
type fixedType struct {
typ reflect.Type
}
func (p *fixedType) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
typ := p.typ
size := typ.Size()
val := reflect.New(typ)
b := (*[1 << 30]byte)(unsafe.Pointer(val.UnsafeAddr()))
_, err = io.ReadFull(in, b[:size])
if err != nil {
log.Warn("fixedType.Match: io.ReadFull failed -", err)
return
}
return val.Interface(), nil
}
func (p *fixedType) RetType() reflect.Type {
return p.typ
}
func (p *fixedType) SizeOf() int {
return int(p.typ.Size())
}
// FixedType returns a matching unit that matches a C style fixed size struct.
//
func FixedType(t reflect.Type) Ruler {
return &fixedType{typ: t}
}
// -----------------------------------------------------------------------------
type uintbe int
func (p uintbe) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
t, err := in.Peek(int(p))
if err != nil {
return
}
var val uint
for i := 0; i < int(p); i++ {
val = (val << 8) | uint(t[i])
}
in.Discard(int(p))
return val, nil
}
func (p uintbe) RetType() reflect.Type {
return tyUint
}
func (p uintbe) SizeOf() int {
return int(p)
}
// Uintbe returns a matching unit that matches a uintbe(n) type.
//
func Uintbe(n int) Ruler {
if n < 2 || n > 8 {
panic("Uintbe: invalid argument (n >= 2 && n <= 8)")
}
return uintbe(n)
}
// -----------------------------------------------------------------------------
type uintle int
func (p uintle) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
t, err := in.Peek(int(p))
if err != nil {
return
}
var val uint
for i := int(p); i > 0; {
i--
val = (val << 8) | uint(t[i])
}
in.Discard(int(p))
return val, nil
}
func (p uintle) RetType() reflect.Type {
return tyUint
}
func (p uintle) SizeOf() int {
return int(p)
}
// Uintle returns a matching unit that matches a uintle(n) type.
//
func Uintle(n int) Ruler {
if n < 2 || n > 8 {
panic("Uintle: invalid argument (n >= 2 && n <= 8)")
}
return uintle(n)
}
// Uint24 is a matching unit that matches a uintle(3) type.
//
var Uint24 = Uintle(3)
// -----------------------------------------------------------------------------
func float32frombits(b uint32) float32 { return *(*float32)(unsafe.Pointer(&b)) }
type float32be int
func (p float32be) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
t, err := in.Peek(4)
if err != nil {
return
}
v = float32frombits(binary.BigEndian.Uint32(t))
in.Discard(4)
return
}
func (p float32be) RetType() reflect.Type {
return tyFloat32
}
func (p float32be) SizeOf() int {
return 4
}
// Float32be returns a matching unit that matches a float32be type.
//
var Float32be Ruler = float32be(0)
// -----------------------------------------------------------------------------
func float64frombits(b uint64) float64 { return *(*float64)(unsafe.Pointer(&b)) }
type float64be int
func (p float64be) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
t, err := in.Peek(8)
if err != nil {
return
}
v = float64frombits(binary.BigEndian.Uint64(t))
in.Discard(8)
return
}
func (p float64be) RetType() reflect.Type {
return tyFloat64
}
func (p float64be) SizeOf() int {
return 8
}
// Float64be returns a matching unit that matches a float64be type.
//
var Float64be Ruler = float64be(0)
// -----------------------------------------------------------------------------