status-go/vendor/github.com/buger/jsonparser/bytes.go

48 lines
862 B
Go

package jsonparser
import (
bio "bytes"
)
// minInt64 '-9223372036854775808' is the smallest representable number in int64
const minInt64 = `9223372036854775808`
// About 2x faster then strconv.ParseInt because it only supports base 10, which is enough for JSON
func parseInt(bytes []byte) (v int64, ok bool, overflow bool) {
if len(bytes) == 0 {
return 0, false, false
}
var neg bool = false
if bytes[0] == '-' {
neg = true
bytes = bytes[1:]
}
var b int64 = 0
for _, c := range bytes {
if c >= '0' && c <= '9' {
b = (10 * v) + int64(c-'0')
} else {
return 0, false, false
}
if overflow = (b < v); overflow {
break
}
v = b
}
if overflow {
if neg && bio.Equal(bytes, []byte(minInt64)) {
return b, true, false
}
return 0, false, true
}
if neg {
return -v, true, false
} else {
return v, true, false
}
}