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package extra
import (
"github.com/json-iterator/go"
"github.com/modern-go/reflect2"
"unicode/utf8"
"unsafe"
)
// safeSet holds the value true if the ASCII character with the given array
// position can be represented inside a JSON string without any further
// escaping.
//
// All values are true except for the ASCII control characters (0-31), the
// double quote ("), and the backslash character ("\").
var safeSet = [utf8.RuneSelf]bool{
' ': true,
'!': true,
'"': false,
'#': true,
'$': true,
'%': true,
'&': true,
'\'': true,
'(': true,
')': true,
'*': true,
'+': true,
',': true,
'-': true,
'.': true,
'/': true,
'0': true,
'1': true,
'2': true,
'3': true,
'4': true,
'5': true,
'6': true,
'7': true,
'8': true,
'9': true,
':': true,
';': true,
'<': true,
'=': true,
'>': true,
'?': true,
'@': true,
'A': true,
'B': true,
'C': true,
'D': true,
'E': true,
'F': true,
'G': true,
'H': true,
'I': true,
'J': true,
'K': true,
'L': true,
'M': true,
'N': true,
'O': true,
'P': true,
'Q': true,
'R': true,
'S': true,
'T': true,
'U': true,
'V': true,
'W': true,
'X': true,
'Y': true,
'Z': true,
'[': true,
'\\': false,
']': true,
'^': true,
'_': true,
'`': true,
'a': true,
'b': true,
'c': true,
'd': true,
'e': true,
'f': true,
'g': true,
'h': true,
'i': true,
'j': true,
'k': true,
'l': true,
'm': true,
'n': true,
'o': true,
'p': true,
'q': true,
'r': true,
's': true,
't': true,
'u': true,
'v': true,
'w': true,
'x': true,
'y': true,
'z': true,
'{': true,
'|': true,
'}': true,
'~': true,
'\u007f': true,
}
var binaryType = reflect2.TypeOfPtr((*[]byte)(nil)).Elem()
type BinaryAsStringExtension struct {
jsoniter.DummyExtension
}
func (extension *BinaryAsStringExtension) CreateEncoder(typ reflect2.Type) jsoniter.ValEncoder {
if typ == binaryType {
return &binaryAsStringCodec{}
}
return nil
}
func (extension *BinaryAsStringExtension) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
if typ == binaryType {
return &binaryAsStringCodec{}
}
return nil
}
type binaryAsStringCodec struct {
}
func (codec *binaryAsStringCodec) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
rawBytes := iter.ReadStringAsSlice()
bytes := make([]byte, 0, len(rawBytes))
for i := 0; i < len(rawBytes); i++ {
b := rawBytes[i]
if b == '\\' {
b2 := rawBytes[i+1]
if b2 != '\\' {
iter.ReportError("decode binary as string", `\\x is only supported escape`)
return
}
b3 := rawBytes[i+2]
if b3 != 'x' {
iter.ReportError("decode binary as string", `\\x is only supported escape`)
return
}
b4 := rawBytes[i+3]
b5 := rawBytes[i+4]
i += 4
b = readHex(iter, b4, b5)
}
bytes = append(bytes, b)
}
*(*[]byte)(ptr) = bytes
}
func (codec *binaryAsStringCodec) IsEmpty(ptr unsafe.Pointer) bool {
return len(*((*[]byte)(ptr))) == 0
}
func (codec *binaryAsStringCodec) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
newBuffer := writeBytes(stream.Buffer(), *(*[]byte)(ptr))
stream.SetBuffer(newBuffer)
}
func readHex(iter *jsoniter.Iterator, b1, b2 byte) byte {
var ret byte
if b1 >= '0' && b1 <= '9' {
ret = b1 - '0'
} else if b1 >= 'a' && b1 <= 'f' {
ret = b1 - 'a' + 10
} else {
iter.ReportError("read hex", "expects 0~9 or a~f, but found "+string([]byte{b1}))
return 0
}
ret *= 16
if b2 >= '0' && b2 <= '9' {
ret += b2 - '0'
} else if b2 >= 'a' && b2 <= 'f' {
ret += b2 - 'a' + 10
} else {
iter.ReportError("read hex", "expects 0~9 or a~f, but found "+string([]byte{b2}))
return 0
}
return ret
}
var hex = "0123456789abcdef"
func writeBytes(space []byte, s []byte) []byte {
space = append(space, '"')
// write string, the fast path, without utf8 and escape support
var i int
var c byte
for i, c = range s {
if c < utf8.RuneSelf && safeSet[c] {
space = append(space, c)
} else {
break
}
}
if i == len(s)-1 {
space = append(space, '"')
return space
}
return writeBytesSlowPath(space, s[i:])
}
func writeBytesSlowPath(space []byte, s []byte) []byte {
start := 0
// for the remaining parts, we process them char by char
var i int
var b byte
for i, b = range s {
if b >= utf8.RuneSelf {
space = append(space, '\\', '\\', 'x', hex[b>>4], hex[b&0xF])
start = i + 1
continue
}
if safeSet[b] {
continue
}
if start < i {
space = append(space, s[start:i]...)
}
space = append(space, '\\', '\\', 'x', hex[b>>4], hex[b&0xF])
start = i + 1
}
if start < len(s) {
space = append(space, s[start:]...)
}
return append(space, '"')
}
|
