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http_chunked.go
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http_chunked.go
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package codec
import (
"bufio"
"bytes"
"errors"
"fmt"
"github.com/yaklang/yaklang/common/log"
"io"
"strconv"
"unicode"
)
func bufioReadLine(reader *bufio.Reader) ([]byte, []byte, error) {
if reader == nil {
return nil, nil, errors.New("empty reader(bufio)")
}
var lineBuffer bytes.Buffer
for {
b, err := reader.ReadByte()
if err != nil {
return nil, nil, err
}
lineBuffer.WriteByte(b)
if b == '\n' {
break
}
}
var lines = lineBuffer.Bytes()
if bytes.HasSuffix(lines, []byte{'\r', '\n'}) {
return lines[:len(lines)-2], []byte{'\r', '\n'}, nil
}
return lines[:len(lines)-1], []byte{'\n'}, nil
}
func ReadHTTPChunkedDataWithFixed(ret []byte) (data []byte, fixedChunked []byte, rest []byte) {
blocks, fixed, reader, _ := readChunkedDataFromReader(bytes.NewReader(ret))
rest, err := io.ReadAll(reader)
if err != nil {
log.Errorf("read chunked data error: %v", err)
}
return blocks, fixed, rest
}
func readHTTPChunkedData(ret []byte) (data []byte, rest []byte) {
blocks, _, reader, _ := readChunkedDataFromReader(bytes.NewReader(ret))
rest, err := io.ReadAll(reader)
if err != nil {
log.Errorf("read chunked data error: %v", err)
}
return blocks, rest
}
func readChunkedDataFromReader(r io.Reader) ([]byte, []byte, io.Reader, error) {
var haveRead = new(bytes.Buffer)
var reader *bufio.Reader
switch r.(type) {
case *bufio.Reader:
reader = r.(*bufio.Reader)
default:
reader = bufio.NewReader(r)
}
// read until space
for {
spaceByte, err := reader.ReadByte()
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), fmt.Errorf("read chunked (strip left space) data error: %v", err)
}
haveRead.WriteByte(spaceByte)
if unicode.IsSpace(rune(spaceByte)) {
continue
} else {
err := reader.UnreadByte()
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), fmt.Errorf("read chunked (strip left space) data error: %v", err)
}
break
}
}
var results bytes.Buffer
var fixedResults bytes.Buffer
for {
lineBytes, delim, err := bufioReadLine(reader)
haveRead.Write(lineBytes)
haveRead.Write(delim)
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), err
}
var comment []byte
var commentExisted bool
lineBytes, comment, commentExisted = bytes.Cut(lineBytes, []byte{';'})
lineBytes = bytes.TrimSpace(lineBytes)
size, err := strconv.ParseInt(string(lineBytes), 16, 64)
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), err
}
if size == 0 {
lastLine, delim, err := bufioReadLine(reader)
haveRead.Write(lastLine)
haveRead.Write(delim)
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), err
}
if len(lastLine) == 0 {
fixedResults.WriteString("0\r\n\r\n")
} else {
log.Warnf("last line of chunked data is not empty: %s", lastLine)
}
return results.Bytes(), fixedResults.Bytes(), reader, nil
}
var buf = make([]byte, size)
blockN, err := io.ReadFull(reader, buf)
results.Write(buf[:blockN])
haveRead.Write(buf[:blockN])
fixedResults.Write(lineBytes)
if commentExisted {
fixedResults.WriteByte(';')
fixedResults.Write(comment)
}
fixedResults.WriteString("\r\n")
fixedResults.Write(buf[:blockN])
fixedResults.WriteString("\r\n")
if err != nil {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), fmt.Errorf("read chunked data error: %v", err)
}
endBlock, delim, _ := bufioReadLine(reader)
haveRead.Write(endBlock)
haveRead.Write(delim)
if len(endBlock) != 0 {
return nil, nil, io.MultiReader(bytes.NewReader(haveRead.Bytes()), reader), fmt.Errorf("read chunked data error: %v", err)
}
}
}