1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/github.com/goccy/go-json/internal/encoder/decode_rune.go b/vendor/github.com/goccy/go-json/internal/encoder/decode_rune.go
new file mode 100644
index 000000000..35c959d48
--- /dev/null
+++ b/vendor/github.com/goccy/go-json/internal/encoder/decode_rune.go
@@ -0,0 +1,126 @@
+package encoder
+
+import "unicode/utf8"
+
+const (
+	// The default lowest and highest continuation byte.
+	locb = 128 //0b10000000
+	hicb = 191 //0b10111111
+
+	// These names of these constants are chosen to give nice alignment in the
+	// table below. The first nibble is an index into acceptRanges or F for
+	// special one-byte cases. The second nibble is the Rune length or the
+	// Status for the special one-byte case.
+	xx = 0xF1 // invalid: size 1
+	as = 0xF0 // ASCII: size 1
+	s1 = 0x02 // accept 0, size 2
+	s2 = 0x13 // accept 1, size 3
+	s3 = 0x03 // accept 0, size 3
+	s4 = 0x23 // accept 2, size 3
+	s5 = 0x34 // accept 3, size 4
+	s6 = 0x04 // accept 0, size 4
+	s7 = 0x44 // accept 4, size 4
+)
+
+// first is information about the first byte in a UTF-8 sequence.
+var first = [256]uint8{
+	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x00-0x0F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x10-0x1F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x20-0x2F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x30-0x3F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x40-0x4F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x50-0x5F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x60-0x6F
+	as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, as, // 0x70-0x7F
+	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
+	xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, // 0x80-0x8F
+	xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, // 0x90-0x9F
+	xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, // 0xA0-0xAF
+	xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, // 0xB0-0xBF
+	xx, xx, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, // 0xC0-0xCF
+	s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, s1, // 0xD0-0xDF
+	s2, s3, s3, s3, s3, s3, s3, s3, s3, s3, s3, s3, s3, s4, s3, s3, // 0xE0-0xEF
+	s5, s6, s6, s6, s7, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, // 0xF0-0xFF
+}
+
+const (
+	lineSep      = byte(168) //'\u2028'
+	paragraphSep = byte(169) //'\u2029'
+)
+
+type decodeRuneState int
+
+const (
+	validUTF8State decodeRuneState = iota
+	runeErrorState
+	lineSepState
+	paragraphSepState
+)
+
+func decodeRuneInString(s string) (decodeRuneState, int) {
+	n := len(s)
+	s0 := s[0]
+	x := first[s0]
+	if x >= as {
+		// The following code simulates an additional check for x == xx and
+		// handling the ASCII and invalid cases accordingly. This mask-and-or
+		// approach prevents an additional branch.
+		mask := rune(x) << 31 >> 31 // Create 0x0000 or 0xFFFF.
+		if rune(s[0])&^mask|utf8.RuneError&mask == utf8.RuneError {
+			return runeErrorState, 1
+		}
+		return validUTF8State, 1
+	}
+	sz := int(x & 7)
+	if n < sz {
+		return runeErrorState, 1
+	}
+	s1 := s[1]
+	switch x >> 4 {
+	case 0:
+		if s1 < locb || hicb < s1 {
+			return runeErrorState, 1
+		}
+	case 1:
+		if s1 < 0xA0 || hicb < s1 {
+			return runeErrorState, 1
+		}
+	case 2:
+		if s1 < locb || 0x9F < s1 {
+			return runeErrorState, 1
+		}
+	case 3:
+		if s1 < 0x90 || hicb < s1 {
+			return runeErrorState, 1
+		}
+	case 4:
+		if s1 < locb || 0x8F < s1 {
+			return runeErrorState, 1
+		}
+	}
+	if sz <= 2 {
+		return validUTF8State, 2
+	}
+	s2 := s[2]
+	if s2 < locb || hicb < s2 {
+		return runeErrorState, 1
+	}
+	if sz <= 3 {
+		// separator character prefixes: [2]byte{226, 128}
+		if s0 == 226 && s1 == 128 {
+			switch s2 {
+			case lineSep:
+				return lineSepState, 3
+			case paragraphSep:
+				return paragraphSepState, 3
+			}
+		}
+		return validUTF8State, 3
+	}
+	s3 := s[3]
+	if s3 < locb || hicb < s3 {
+		return runeErrorState, 1
+	}
+	return validUTF8State, 4
+}