TUN-5261: Collect QUIC metrics about RTT, packets and bytes transfered and log events at tracing level

vendor/github.com/francoispqt/gojay/decode_number.go

@@ -0,0 +1,118 @@
+package gojay
+
+import (
+	"math"
+)
+
+var digits []int8
+
+const maxInt64toMultiply = math.MaxInt64 / 10
+const maxInt32toMultiply = math.MaxInt32 / 10
+const maxInt16toMultiply = math.MaxInt16 / 10
+const maxInt8toMultiply = math.MaxInt8 / 10
+const maxUint8toMultiply = math.MaxUint8 / 10
+const maxUint16toMultiply = math.MaxUint16 / 10
+const maxUint32toMultiply = math.MaxUint32 / 10
+const maxUint64toMultiply = math.MaxUint64 / 10
+const maxUint32Length = 10
+const maxUint64Length = 20
+const maxUint16Length = 5
+const maxUint8Length = 3
+const maxInt32Length = 10
+const maxInt64Length = 19
+const maxInt16Length = 5
+const maxInt8Length = 3
+const invalidNumber = int8(-1)
+
+var pow10uint64 = [21]uint64{
+	0,
+	1,
+	10,
+	100,
+	1000,
+	10000,
+	100000,
+	1000000,
+	10000000,
+	100000000,
+	1000000000,
+	10000000000,
+	100000000000,
+	1000000000000,
+	10000000000000,
+	100000000000000,
+	1000000000000000,
+	10000000000000000,
+	100000000000000000,
+	1000000000000000000,
+	10000000000000000000,
+}
+
+var skipNumberEndCursorIncrement [256]int
+
+func init() {
+	digits = make([]int8, 256)
+	for i := 0; i < len(digits); i++ {
+		digits[i] = invalidNumber
+	}
+	for i := int8('0'); i <= int8('9'); i++ {
+		digits[i] = i - int8('0')
+	}
+
+	for i := 0; i < 256; i++ {
+		switch i {
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', 'e', 'E', '+', '-':
+			skipNumberEndCursorIncrement[i] = 1
+		}
+	}
+}
+
+func (dec *Decoder) skipNumber() (int, error) {
+	end := dec.cursor + 1
+	// look for following numbers
+	for j := dec.cursor + 1; j < dec.length || dec.read(); j++ {
+		end += skipNumberEndCursorIncrement[dec.data[j]]
+
+		switch dec.data[j] {
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', 'e', 'E', '+', '-', ' ', '\n', '\t', '\r':
+			continue
+		case ',', '}', ']':
+			return end, nil
+		default:
+			// invalid json we expect numbers, dot (single one), comma, or spaces
+			return end, dec.raiseInvalidJSONErr(dec.cursor)
+		}
+	}
+
+	return end, nil
+}
+
+func (dec *Decoder) getExponent() (int64, error) {
+	start := dec.cursor
+	end := dec.cursor
+	for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
+		switch dec.data[dec.cursor] { // is positive
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			end = dec.cursor + 1
+		case '-':
+			dec.cursor++
+			exp, err := dec.getExponent()
+			return -exp, err
+		case '+':
+			dec.cursor++
+			return dec.getExponent()
+		default:
+			// if nothing return 0
+			// could raise error
+			if start == end {
+				return 0, dec.raiseInvalidJSONErr(dec.cursor)
+			}
+			return dec.atoi64(start, end-1), nil
+		}
+	}
+	if start == end {
+
+		return 0, dec.raiseInvalidJSONErr(dec.cursor)
+	}
+	return dec.atoi64(start, end-1), nil
+}