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parser.go
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parser.go
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package tbcload
import (
"bufio"
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"math"
"os"
"strconv"
"strings"
)
// Parser read tbc file and write 'dissemble' to w
type Parser struct {
r Decoder
w bufio.Writer
Detail bool //true: disassemble bytecode
codeBytes bytes.Buffer
codeDelta bytes.Buffer
codeLength bytes.Buffer
}
// NewParser create Parser
func NewParser(r io.Reader, w io.Writer) *Parser {
return &Parser{r: *NewDecoder(r), w: *bufio.NewWriter(w)}
}
const tbcFileBeginWith = "TclPro ByteCode "
// Parse from io.Reader
func (p *Parser) Parse() (err error) {
if err = p.skipUntil(tbcFileBeginWith); err != nil {
return
}
err = p.parseByteCode()
p.w.Flush()
return
}
func (p *Parser) skipUntil(prefix string) (err error) {
var buf [maxCharsOneLine]byte
var nRead int
for {
if nRead, err = p.r.ReadRaw(buf[:]); err != nil {
return
}
if strings.HasPrefix(string(buf[:nRead]), prefix) {
return nil
}
}
}
func (p *Parser) parseIntLine() (res int64, err error) {
var buf [maxCharsOneLine]byte
var nRead int
if nRead, err = p.r.ReadRaw(buf[:]); err == nil {
res, err = strconv.ParseInt(string(buf[:nRead]), 10, 32)
}
return
}
func (p *Parser) parseIntList() (res []int64, err error) {
var buf [maxCharsOneLine]byte
var nRead int
var i64 int64
if nRead, err = p.r.ReadRaw(buf[:]); err != nil {
return nil, err
}
fields := strings.Fields(string(buf[:nRead]))
result := make([]int64, len(fields))
for i, s := range fields {
if i64, err = strconv.ParseInt(s, 10, 32); err != nil {
return nil, err
}
result[i] = i64
}
return result, nil
}
func (p *Parser) parseByteCode() (err error) {
//1. procedure struct info
if _, err = p.parseRawStringLine(); err != nil {
return
}
//2. ByteCode
if err = p.parseCode(); err != nil {
return
}
//3. CodeDelta
if err = p.parseCodeDelta(); err != nil {
return
}
//4. CodeLength
if err = p.parseCodeLength(); err != nil {
return
}
//if dump all instruction
if p.Detail {
if err = p.parseDecompile(); err != nil {
return
}
}
//5. ObjectArray
if err = p.parseObjectArray(); err != nil {
return
}
//6. ExcRangeArray
if err = p.parseExcRangeArray(); err != nil {
return
}
//6. AuxDataArray
err = p.parseAuxDataArray()
return
}
func (p *Parser) parseObjectArray() (err error) {
var num int64
if num, err = p.parseIntLine(); err != nil {
return err
}
for index := 0; index < int(num); index++ {
//output
p.w.WriteString(fmt.Sprintf("[lit-%04d]", index))
if err = p.parseObject(); err != nil {
return err
}
p.w.WriteByte('\n')
}
return
}
func (p *Parser) parseObjectType() (c byte, err error) {
var buf [maxCharsOneLine]byte
if _, err = p.r.ReadRaw(buf[:]); err != nil {
return 0, err
}
return buf[0], err
}
// ErrUnsupoortedObjectType means object type is not correct
var ErrUnsupoortedObjectType = errors.New("object type is not supported")
func (p *Parser) parseObject() (err error) {
var objType byte
if objType, err = p.parseObjectType(); err != nil {
return err
}
switch objType {
case 'i', 'd', 's':
err = p.parseSimpleObject()
case 'x':
err = p.parseXStringObject()
case 'p':
err = p.parseProcedureObject()
default:
err = ErrUnsupoortedObjectType
}
return
}
func (p *Parser) parseSimpleObject() (err error) {
var buf [maxCharsOneLine]byte
var nRead int
if nRead, err = p.r.ReadRaw(buf[:]); err != nil {
return err
}
//output
p.w.Write(buf[:nRead])
return
}
func (p *Parser) parseXStringObject() (err error) {
var buf [20480]byte
var nRead int
var nLen int64
if nLen, err = p.parseIntLine(); err != nil {
return err
}
if nLen == 0 {
p.r.ReadRaw(buf[:])
return nil
}
if nRead, err = p.r.Read(buf[:]); err != nil {
return err
}
//output
p.w.Write(buf[:nRead])
return
}
func (p *Parser) parseProcedureObject() (err error) {
var lengths []int64
p.w.WriteString("\n---procedure begin---\n")
//1. ByteCode
if err = p.parseByteCode(); err != nil {
return
}
//2. numArgs numCompiledLocal
if lengths, err = p.parseIntList(); err != nil || len(lengths) != 2 {
return
}
//3. for-loop {CompiledLocal}
for index := 0; index < int(lengths[1]); index++ {
if err = p.parseCompiledLocal(); err != nil {
return
}
}
p.w.WriteString("\n---procedure end ---")
return
}
func (p *Parser) parseCompiledLocal() (err error) {
var sName string
var ints []int64
//1. name
if _, err = p.parseIntLine(); err != nil {
return
}
if sName, err = p.parseASCII85StringLine(); err != nil {
return
}
//2. index hasDef mask
if ints, err = p.parseIntList(); err != nil || len(ints) != 3 {
return
}
ss := fmt.Sprintf("[local-%02d]name=%s,hasDefault=%d ", ints[0], sName, ints[1])
p.w.WriteString(ss)
//3. if (hasDef) Object
if ints[1] == 1 {
err = p.parseObject()
}
p.w.WriteByte('\n')
return
}
func (p *Parser) parseExcRangeArray() (err error) {
var nLen int64
if nLen, err = p.parseIntLine(); err != nil {
return
}
for index := 0; index < int(nLen); index++ {
p.parseRawStringLine()
}
return
}
func (p *Parser) parseAuxDataArray() (err error) {
//TODO we dont support AuxData parser. later.
var num int64
if num, err = p.parseIntLine(); err != nil {
return
}
for index := 0; index < int(num); index++ {
//we only support CMP_FOREACH_INFO('F')
//and only for numLists=1,numVars=1
//F
//numLists firstValueTemp loopCtTemp
//numVars
//*varIndexesPtr
if _, err = p.parseRawStringLine(); err != nil {
return
}
if _, err = p.parseRawStringLine(); err != nil {
return
}
if _, err = p.parseRawStringLine(); err != nil {
return
}
if _, err = p.parseRawStringLine(); err != nil {
return
}
}
return err
}
func (p *Parser) parseCodeDelta() (err error) {
var buf [20480]byte
var nRead int
var nRes int64
if nRes, err = p.parseIntLine(); err != nil {
return
}
if nRead, err = p.r.Read(buf[:]); err != nil {
return
}
p.codeDelta.Reset()
if nRes > 0 && nRead > 0 {
s := hex.EncodeToString(buf[:nRead])
_, err = p.w.WriteString(s)
err = p.w.WriteByte('\n')
if nRead > int(nRes) {
nRead = int(nRes)
}
p.codeDelta.Write(buf[:nRead])
}
return
}
func (p *Parser) parseCodeLength() (err error) {
var buf [20480]byte
var nRead int
var nRes int64
if nRes, err = p.parseIntLine(); err != nil {
return
}
if nRead, err = p.r.Read(buf[:]); err != nil {
return
}
p.codeLength.Reset()
if nRes > 0 && nRead > 0 {
s := hex.EncodeToString(buf[:nRead])
_, err = p.w.WriteString(s)
err = p.w.WriteByte('\n')
if nRead > int(nRes) {
nRead = int(nRes)
}
p.codeLength.Write(buf[:nRead])
}
return
}
func (p *Parser) parseCode() (err error) {
var buf [2048000]byte
var nRead int
var nRes int64
if nRes, err = p.parseIntLine(); err != nil {
return
}
if nRead, err = p.r.Read(buf[:]); err != nil {
return
}
p.codeBytes.Reset()
if nRes > 0 && nRead > 0 {
s := hex.EncodeToString(buf[:nRead])
_, err = p.w.WriteString(s)
err = p.w.WriteByte('\n')
if nRead > int(nRes) {
nRead = int(nRes)
}
p.codeBytes.Write(buf[:nRead])
}
return
}
// only conver asci85 to hex printing.
func (p *Parser) parseHex() (err error) {
var buf [20480]byte
var nRead int
if _, err = p.parseIntLine(); err != nil {
return
}
if nRead, err = p.r.Read(buf[:]); err != nil {
return
}
s := hex.EncodeToString(buf[:nRead])
_, err = p.w.WriteString(s)
err = p.w.WriteByte('\n')
// if isCode {
// err = p.parseDisassembleCode(buf[:nRead])
// }
return
}
func parseOperand(src []byte, operandType byte) (res string, nextSrc []byte, err error) {
var nLen = 0
switch operandType {
case OPERAND_NONE:
nLen = 0
case OPERAND_INT1, OPERAND_LVT1, OPERAND_OFFSET1:
/* One byte signed integer. */
res = strconv.Itoa(int(int8(src[0])))
nLen = 1
case OPERAND_UINT1, OPERAND_LIT1, OPERAND_SCLS1:
/* One byte unsigned integer. */
res = strconv.Itoa(int(uint8(src[0])))
nLen = 1
case OPERAND_INT4, OPERAND_IDX4, OPERAND_OFFSET4:
/* Four byte signed integer. */
var i int32
nLen = 4
buf := bytes.NewBuffer(src[:nLen])
err = binary.Read(buf, binary.BigEndian, &i)
res = strconv.Itoa(int(i))
case OPERAND_UINT4, OPERAND_LVT4, OPERAND_AUX4, OPERAND_LIT4:
/* Four byte unsigned integer. */
var i uint32
nLen = 4
buf := bytes.NewBuffer(src[:nLen])
err = binary.Read(buf, binary.BigEndian, &i)
res = strconv.Itoa(int(i))
//BUG? int(uint32(i))?
}
return res, src[nLen:], err
}
func paresOneOp(src []byte) (res string, numBytes int, err error) {
var b strings.Builder
var str string
opInt := int(src[0])
if opInt >= len(tclOpTable) {
return "", 1, os.ErrNotExist
}
opName := tclOpTable[opInt].name
bytes := tclOpTable[opInt].numBytes
numOperands := tclOpTable[opInt].numOperands
op1 := tclOpTable[opInt].opTypes[0]
op2 := tclOpTable[opInt].opTypes[1]
b.WriteString(opName)
src = src[1:]
if numOperands > 0 {
if str, src, err = parseOperand(src, op1); err != nil {
return b.String(), bytes, err
}
b.WriteByte(' ')
b.WriteString(str)
}
if numOperands > 1 {
if str, _, err = parseOperand(src, op2); err != nil {
return b.String(), bytes, err
}
b.WriteByte(' ')
b.WriteString(str)
}
return b.String(), bytes, err
}
func (p *Parser) parseDecompile() (err error) {
var str string
var bytes int
var totalBytes int
src := p.codeBytes.Bytes()
codeDelta := p.codeDelta.Bytes()
codeLength := p.codeLength.Bytes()
numCmds := len(codeDelta)
indexCmds := 0
cmdBegin := true
var cmdBytes, cmdDelta int
if len(src) == 0 {
return
}
for len(src) > 0 {
if str, bytes, err = paresOneOp(src); err != nil {
return err
}
//1. print command title: command %d,pc=xx-xx
if numCmds > 0 && indexCmds < (numCmds) {
if cmdBegin {
cmdBytes = bytes
cmdBegin = false
//BUG,FIXME, we dont consider codeDelta = 0xFF 4bytes case
samePCforCmds := true
for samePCforCmds {
//cmdDelta = int(p.codeDelta[indexCmds+1])
p.w.WriteString(fmt.Sprintf("\tCommand %d", indexCmds))
if indexCmds < len(codeLength) {
//BUG,FIXME, we dont consider codeLength = 0xFF 4bytes case
p.w.WriteString(fmt.Sprintf(",pc= %d-%d", totalBytes, totalBytes+int(codeLength[indexCmds])-1))
}
p.w.WriteByte('\n')
indexCmds++
//cmdDelta 是下一条Command 相对于当前Comand的bytes偏移量
//如果是最后一条命令,cmdDelta赋值MAX
if indexCmds < len(codeDelta) {
cmdDelta = int(codeDelta[indexCmds])
} else {
cmdDelta = math.MaxInt32
}
if cmdDelta != 0 {
samePCforCmds = false
}
}
if cmdBytes >= cmdDelta {
cmdBegin = true
}
} else {
cmdBytes += bytes
if cmdBytes >= cmdDelta {
cmdBegin = true
}
}
}
//2. print command instruction
p.w.WriteString(fmt.Sprintf("\t(%d)", totalBytes))
p.w.WriteString(str)
p.w.WriteByte('\n')
src = src[bytes:]
totalBytes += bytes
}
return
}
func (p *Parser) parseRawStringLine() (str string, err error) {
var buf [maxCharsOneLine]byte
var nRead int
if nRead, err = p.r.ReadRaw(buf[:]); err != nil {
return "", err
}
return string(buf[:nRead]), err
}
func (p *Parser) parseASCII85StringLine() (str string, err error) {
var buf [maxCharsOneLine]byte
var nRead int
if nRead, err = p.r.Read(buf[:]); err != nil {
return "", err
}
return string(buf[:nRead]), err
}