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pickledispatch.go
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pickledispatch.go
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package pickle
import (
"encoding/binary"
"fmt"
"reflect"
"runtime"
)
// See: https://github.com/python/cpython/blob/main/Lib/pickle.py
// See: https://docs.python.org/3/library/struct.html#format-characters
const (
// This is the highest protocol number we know how to read.
HIGHEST_PROTOCOL byte = 5
MaxUint = ^uint32(0)
MaxInt = int(MaxUint >> 1)
MAXSIZE = MaxInt
PROTO byte = 0x80 // identify pickle protocol
EMPTY_DICT byte = '}' // push empty dict
BINPUT byte = 'q' // " " " " " ; " " 1-byte arg
MARK byte = '(' // push special markobject on stack
BINUNICODE byte = 'X' // " " " ; counted UTF-8 string argument
GLOBAL byte = 'c' // push self.find_class(modname, name); 2 string args
BININT byte = 'J' // push four-byte signed int
BINSTRING byte = 'T' // push string; counted binary string argument
TUPLE byte = 't' // build tuple from topmost stack items
BINPERSID byte = 'Q' // " " " ; " " " " stack
BININT1 byte = 'K' // push 1-byte unsigned int
BININT2 byte = 'M' // push 2-byte unsigned int
TUPLE1 byte = '\x85' // build 1-tuple from stack top
TUPLE2 byte = '\x86' // build 2-tuple from two topmost stack items
TUPLE3 byte = '\x87' // build 3-tuple from three topmost stack items
NEWTRUE byte = '\x88' // push True
NEWFALSE byte = '\x89' // push False
EMPTY_TUPLE byte = ')' // push empty tuple
REDUCE byte = 'R' // apply callable to argtuple, both on stack
BINGET byte = 'h' // " " " " " " ; " " 1-byte arg
LONG_BINPUT byte = 'r' // " " " " " ; " " 4-byte arg
STOP byte = '.' // every pickle ends with STOP
SHORT_BINSTRING byte = 'U' // " " ; " " " " < 256 bytes
SETITEMS byte = 'u' // modify dict by adding topmost key+value pairs
)
type dispatchFunc = func(*PickleReader) error
var dispatcher = make(map[byte]dispatchFunc)
func init() {
dispatcher[PROTO] = load_proto
dispatcher[EMPTY_DICT] = load_empty_dictionary
dispatcher[BINPUT] = load_binput
dispatcher[MARK] = load_mark
dispatcher[BINUNICODE] = load_binunicode
dispatcher[GLOBAL] = load_global
dispatcher[BININT] = load_binint
dispatcher[BINSTRING] = load_binstring
dispatcher[TUPLE] = load_tuple
dispatcher[BINPERSID] = load_binpersid
dispatcher[BININT1] = load_binint1
dispatcher[BININT2] = load_binint2
dispatcher[TUPLE1] = load_tuple1
dispatcher[TUPLE2] = load_tuple2
dispatcher[TUPLE3] = load_tuple3
dispatcher[NEWTRUE] = load_true
dispatcher[NEWFALSE] = load_false
dispatcher[EMPTY_TUPLE] = load_empty_tuple
dispatcher[REDUCE] = load_reduce
dispatcher[BINGET] = load_binget
dispatcher[LONG_BINPUT] = load_long_binput
dispatcher[STOP] = load_stop
dispatcher[SHORT_BINSTRING] = load_short_binstring
dispatcher[SETITEMS] = load_setitems
}
func pop(stack []interface{}) ([]interface{}, interface{}) {
l := len(stack)
element := stack[l-1]
stack = stack[:l-1]
return stack, element
}
func dispatch(pr *PickleReader, key byte) error {
fn, ok := dispatcher[key]
if ok {
//fnReflect := runtime.FuncForPC(reflect.ValueOf(fn).Pointer()).Name()
//fmt.Printf("Func: %v\n", fnReflect)
return fn(pr)
}
return fmt.Errorf("unsupported Pickle op code: 0x%X '%c'", key, key)
}
func load_proto(pr *PickleReader) error {
proto, err := pr.ReadByte()
if err != nil {
return err
}
if proto > HIGHEST_PROTOCOL {
return fmt.Errorf("unsupported pickle protocol: %d", proto)
}
pr.proto = proto
return nil
}
func load_empty_dictionary(pr *PickleReader) error {
pr.Append(NewPickleDict[interface{}]())
return nil
}
func load_binput(pr *PickleReader) error {
i, err := pr.ReadByte()
if err != nil {
return err
}
pr.memo[int(i)] = pr.stack[len(pr.stack)-1]
return nil
}
func load_mark(pr *PickleReader) error {
pr.metastack = append(pr.metastack, pr.stack)
pr.stack = nil
pr.stack = make([]interface{}, 0)
return nil
}
func load_binunicode(pr *PickleReader) error {
buf, err := pr.Read(4)
if err != nil {
return err
}
len := int(binary.LittleEndian.Uint32(buf)) // Python equivalent: unpack('<I')
if len > MAXSIZE {
return fmt.Errorf("unpickling: BINUNICODE exceeds system's maximum size of %d bytes", MAXSIZE)
}
buf, err = pr.Read(len)
if err != nil {
return err
}
pr.Append(string(buf))
return nil
}
func load_global(pr *PickleReader) error {
module, err := pr.ReadLine()
if err != nil {
return err
}
name, err := pr.ReadLine()
if err != nil {
return err
}
klass, err := pr.findClass(module, name)
if err != nil {
return err
}
pr.Append(klass)
return nil
}
func load_binint(pr *PickleReader) error {
buf, err := pr.Read(4)
if err != nil {
return err
}
pr.Append(int32(binary.LittleEndian.Uint32(buf))) // Python equivalent: unpack('<i')
return nil
}
func load_binstring(pr *PickleReader) error {
// Deprecated BINSTRING uses signed 32-bit length
buf, err := pr.Read(4)
if err != nil {
return err
}
len := int(binary.LittleEndian.Uint32(buf)) // Python equivalent: unpack('<i')
if len < 0 {
return fmt.Errorf("unpickling: BINSTRING pickle has negative byte count")
}
data, err := pr.Read(len)
if err != nil {
return err
}
pr.Append(string(data))
return nil
}
func load_tuple(pr *PickleReader) error {
items := pop_mark(pr)
pr.Append(items)
return nil
}
// Return a list of items pushed in the stack after last MARK instruction.
func pop_mark(pr *PickleReader) []interface{} {
items := pr.stack
var element interface{}
pr.metastack, element = pop(pr.metastack)
pr.stack = element.([]interface{})
return items
}
func load_binpersid(pr *PickleReader) error {
var pid interface{}
pr.stack, pid = pop(pr.stack)
result, err := pr.persistentLoad(pid.([]interface{}))
if err != nil {
return err
}
pr.Append(result)
return nil
}
func load_binint1(pr *PickleReader) error {
val, err := pr.ReadByte()
if err != nil {
return err
}
pr.Append(val)
return nil
}
func load_binint2(pr *PickleReader) error {
buf, err := pr.Read(2)
if err != nil {
return err
}
pr.Append(binary.LittleEndian.Uint16(buf)) // Python equivalent: unpack('<H')
return nil
}
func load_tuple1(pr *PickleReader) error {
pr.stack[len(pr.stack)-1] = PickleTuple{pr.stack[len(pr.stack)-1]}
return nil
}
func load_tuple2(pr *PickleReader) error {
pr.stack[len(pr.stack)-2] = PickleTuple{pr.stack[len(pr.stack)-2], pr.stack[len(pr.stack)-1]}
pr.stack = pr.stack[:len(pr.stack)-1]
return nil
}
func load_tuple3(pr *PickleReader) error {
pr.stack[len(pr.stack)-3] = PickleTuple{pr.stack[len(pr.stack)-3], pr.stack[len(pr.stack)-2], pr.stack[len(pr.stack)-2]}
pr.stack = pr.stack[:len(pr.stack)-2]
return nil
}
func load_false(pr *PickleReader) error {
pr.Append(false)
return nil
}
func load_true(pr *PickleReader) error {
pr.Append(true)
return nil
}
func load_empty_tuple(pr *PickleReader) error {
pr.Append(make(PickleTuple, 0))
return nil
}
func load_reduce(pr *PickleReader) error {
var rawArgs interface{}
pr.stack, rawArgs = pop(pr.stack)
rawArgsArr := rawArgs.([]interface{})
fn := pr.stack[len(pr.stack)-1]
fnType := reflect.TypeOf(fn)
requiredArgsCount := fnType.NumIn()
args := make([]reflect.Value, requiredArgsCount)
for i, arg := range rawArgsArr {
argType := fnType.In(i)
argVal := reflect.ValueOf(arg)
if !argVal.CanConvert(argType) {
fnName := runtime.FuncForPC(reflect.ValueOf(fn).Pointer()).Name()
return fmt.Errorf("cannot convert value in type %s to type %s, for argument index %d of function \"%s\"", argVal.Type().Name(), argType.Name(), i, fnName)
}
args[i] = argVal.Convert(argType)
}
// For optional and/or remaining arguments which we don't have value,
// we create zero/nil values in each input type
for i := len(rawArgsArr); i < requiredArgsCount; i++ {
argType := fnType.In(i)
args[i] = reflect.Zero(argType)
}
resultArr := reflect.ValueOf(fn).Call(args)
result := make([]interface{}, len(resultArr))
for i, item := range resultArr {
result[i] = item.Interface()
}
pr.stack[len(pr.stack)-1] = result[0]
return nil
}
func load_binget(pr *PickleReader) error {
i, err := pr.ReadByte()
if err != nil {
return err
}
item, ok := pr.memo[int(i)]
if !ok {
return fmt.Errorf("memo value not found at index %d", i)
}
pr.Append(item)
return nil
}
func load_long_binput(pr *PickleReader) error {
buf, err := pr.Read(4)
if err != nil {
return err
}
i := int(binary.LittleEndian.Uint32(buf)) // Python equivalent: unpack('<I')
if i > MAXSIZE {
return fmt.Errorf("negative LONG_BINPUT argument")
}
pr.memo[i] = pr.stack[len(pr.stack)-1]
return nil
}
func load_stop(pr *PickleReader) error {
var value interface{}
pr.stack, value = pop(pr.stack)
return &StopSignal{value.(*PickleDict[interface{}])}
}
func load_short_binstring(pr *PickleReader) error {
len, err := pr.ReadByte()
if err != nil {
return err
}
data, err := pr.Read(int(len))
if err != nil {
return err
}
pr.Append(string(data))
return nil
}
func load_setitems(pr *PickleReader) error {
items := pop_mark(pr)
dict := pr.stack[len(pr.stack)-1].(*PickleDict[interface{}])
for i := 0; i < len(items); i += 2 {
dict.Set(items[i].(string), items[i+1])
}
return nil
}