mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-08-31 20:10:55 +02:00
243 lines
4.8 KiB
Go
Vendored
243 lines
4.8 KiB
Go
Vendored
package decoder
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import (
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"fmt"
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"reflect"
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"unsafe"
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"github.com/goccy/go-json/internal/errors"
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"github.com/goccy/go-json/internal/runtime"
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)
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type intDecoder struct {
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typ *runtime.Type
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kind reflect.Kind
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op func(unsafe.Pointer, int64)
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structName string
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fieldName string
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}
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func newIntDecoder(typ *runtime.Type, structName, fieldName string, op func(unsafe.Pointer, int64)) *intDecoder {
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return &intDecoder{
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typ: typ,
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kind: typ.Kind(),
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op: op,
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structName: structName,
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fieldName: fieldName,
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}
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}
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func (d *intDecoder) typeError(buf []byte, offset int64) *errors.UnmarshalTypeError {
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return &errors.UnmarshalTypeError{
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Value: fmt.Sprintf("number %s", string(buf)),
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Type: runtime.RType2Type(d.typ),
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Struct: d.structName,
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Field: d.fieldName,
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Offset: offset,
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}
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}
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var (
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pow10i64 = [...]int64{
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1e00, 1e01, 1e02, 1e03, 1e04, 1e05, 1e06, 1e07, 1e08, 1e09,
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1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18,
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}
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pow10i64Len = len(pow10i64)
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)
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func (d *intDecoder) parseInt(b []byte) (int64, error) {
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isNegative := false
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if b[0] == '-' {
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b = b[1:]
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isNegative = true
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}
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maxDigit := len(b)
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if maxDigit > pow10i64Len {
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return 0, fmt.Errorf("invalid length of number")
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}
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sum := int64(0)
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for i := 0; i < maxDigit; i++ {
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c := int64(b[i]) - 48
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digitValue := pow10i64[maxDigit-i-1]
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sum += c * digitValue
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}
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if isNegative {
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return -1 * sum, nil
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}
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return sum, nil
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}
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var (
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numTable = [256]bool{
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'0': true,
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'1': true,
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'2': true,
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'3': true,
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'4': true,
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'5': true,
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'6': true,
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'7': true,
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'8': true,
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'9': true,
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}
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)
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var (
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numZeroBuf = []byte{'0'}
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)
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func (d *intDecoder) decodeStreamByte(s *Stream) ([]byte, error) {
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for {
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switch s.char() {
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case ' ', '\n', '\t', '\r':
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s.cursor++
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continue
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case '-':
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start := s.cursor
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for {
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s.cursor++
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if numTable[s.char()] {
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continue
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} else if s.char() == nul {
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if s.read() {
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s.cursor-- // for retry current character
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continue
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}
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}
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break
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}
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num := s.buf[start:s.cursor]
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if len(num) < 2 {
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goto ERROR
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}
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return num, nil
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case '0':
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s.cursor++
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return numZeroBuf, nil
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case '1', '2', '3', '4', '5', '6', '7', '8', '9':
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start := s.cursor
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for {
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s.cursor++
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if numTable[s.char()] {
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continue
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} else if s.char() == nul {
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if s.read() {
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s.cursor-- // for retry current character
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continue
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}
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}
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break
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}
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num := s.buf[start:s.cursor]
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return num, nil
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case 'n':
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if err := nullBytes(s); err != nil {
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return nil, err
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}
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return nil, nil
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case nul:
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if s.read() {
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continue
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}
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goto ERROR
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default:
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return nil, d.typeError([]byte{s.char()}, s.totalOffset())
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}
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}
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ERROR:
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return nil, errors.ErrUnexpectedEndOfJSON("number(integer)", s.totalOffset())
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}
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func (d *intDecoder) decodeByte(buf []byte, cursor int64) ([]byte, int64, error) {
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b := (*sliceHeader)(unsafe.Pointer(&buf)).data
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for {
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switch char(b, cursor) {
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case ' ', '\n', '\t', '\r':
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cursor++
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continue
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case '0':
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cursor++
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return numZeroBuf, cursor, nil
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case '-', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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start := cursor
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cursor++
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for numTable[char(b, cursor)] {
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cursor++
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}
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num := buf[start:cursor]
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return num, cursor, nil
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case 'n':
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if err := validateNull(buf, cursor); err != nil {
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return nil, 0, err
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}
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cursor += 4
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return nil, cursor, nil
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default:
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return nil, 0, d.typeError([]byte{char(b, cursor)}, cursor)
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}
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}
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}
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func (d *intDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
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bytes, err := d.decodeStreamByte(s)
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if err != nil {
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return err
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}
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if bytes == nil {
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return nil
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}
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i64, err := d.parseInt(bytes)
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if err != nil {
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return d.typeError(bytes, s.totalOffset())
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}
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switch d.kind {
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case reflect.Int8:
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if i64 <= -1*(1<<7) || (1<<7) <= i64 {
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return d.typeError(bytes, s.totalOffset())
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}
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case reflect.Int16:
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if i64 <= -1*(1<<15) || (1<<15) <= i64 {
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return d.typeError(bytes, s.totalOffset())
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}
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case reflect.Int32:
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if i64 <= -1*(1<<31) || (1<<31) <= i64 {
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return d.typeError(bytes, s.totalOffset())
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}
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}
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d.op(p, i64)
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s.reset()
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return nil
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}
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func (d *intDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
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bytes, c, err := d.decodeByte(ctx.Buf, cursor)
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if err != nil {
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return 0, err
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}
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if bytes == nil {
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return c, nil
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}
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cursor = c
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i64, err := d.parseInt(bytes)
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if err != nil {
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return 0, d.typeError(bytes, cursor)
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}
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switch d.kind {
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case reflect.Int8:
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if i64 <= -1*(1<<7) || (1<<7) <= i64 {
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return 0, d.typeError(bytes, cursor)
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}
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case reflect.Int16:
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if i64 <= -1*(1<<15) || (1<<15) <= i64 {
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return 0, d.typeError(bytes, cursor)
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}
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case reflect.Int32:
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if i64 <= -1*(1<<31) || (1<<31) <= i64 {
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return 0, d.typeError(bytes, cursor)
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}
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}
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d.op(p, i64)
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return cursor, nil
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}
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