mirror of
https://github.com/go-gitea/gitea
synced 2024-11-15 22:54:24 +00:00
498 lines
9.9 KiB
Go
498 lines
9.9 KiB
Go
package ber
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"reflect"
|
|
"errors"
|
|
)
|
|
|
|
type Packet struct {
|
|
ClassType uint8
|
|
TagType uint8
|
|
Tag uint8
|
|
Value interface{}
|
|
ByteValue []byte
|
|
Data *bytes.Buffer
|
|
Children []*Packet
|
|
Description string
|
|
}
|
|
|
|
const (
|
|
TagEOC = 0x00
|
|
TagBoolean = 0x01
|
|
TagInteger = 0x02
|
|
TagBitString = 0x03
|
|
TagOctetString = 0x04
|
|
TagNULL = 0x05
|
|
TagObjectIdentifier = 0x06
|
|
TagObjectDescriptor = 0x07
|
|
TagExternal = 0x08
|
|
TagRealFloat = 0x09
|
|
TagEnumerated = 0x0a
|
|
TagEmbeddedPDV = 0x0b
|
|
TagUTF8String = 0x0c
|
|
TagRelativeOID = 0x0d
|
|
TagSequence = 0x10
|
|
TagSet = 0x11
|
|
TagNumericString = 0x12
|
|
TagPrintableString = 0x13
|
|
TagT61String = 0x14
|
|
TagVideotexString = 0x15
|
|
TagIA5String = 0x16
|
|
TagUTCTime = 0x17
|
|
TagGeneralizedTime = 0x18
|
|
TagGraphicString = 0x19
|
|
TagVisibleString = 0x1a
|
|
TagGeneralString = 0x1b
|
|
TagUniversalString = 0x1c
|
|
TagCharacterString = 0x1d
|
|
TagBMPString = 0x1e
|
|
TagBitmask = 0x1f // xxx11111b
|
|
)
|
|
|
|
var TagMap = map[uint8]string{
|
|
TagEOC: "EOC (End-of-Content)",
|
|
TagBoolean: "Boolean",
|
|
TagInteger: "Integer",
|
|
TagBitString: "Bit String",
|
|
TagOctetString: "Octet String",
|
|
TagNULL: "NULL",
|
|
TagObjectIdentifier: "Object Identifier",
|
|
TagObjectDescriptor: "Object Descriptor",
|
|
TagExternal: "External",
|
|
TagRealFloat: "Real (float)",
|
|
TagEnumerated: "Enumerated",
|
|
TagEmbeddedPDV: "Embedded PDV",
|
|
TagUTF8String: "UTF8 String",
|
|
TagRelativeOID: "Relative-OID",
|
|
TagSequence: "Sequence and Sequence of",
|
|
TagSet: "Set and Set OF",
|
|
TagNumericString: "Numeric String",
|
|
TagPrintableString: "Printable String",
|
|
TagT61String: "T61 String",
|
|
TagVideotexString: "Videotex String",
|
|
TagIA5String: "IA5 String",
|
|
TagUTCTime: "UTC Time",
|
|
TagGeneralizedTime: "Generalized Time",
|
|
TagGraphicString: "Graphic String",
|
|
TagVisibleString: "Visible String",
|
|
TagGeneralString: "General String",
|
|
TagUniversalString: "Universal String",
|
|
TagCharacterString: "Character String",
|
|
TagBMPString: "BMP String",
|
|
}
|
|
|
|
const (
|
|
ClassUniversal = 0 // 00xxxxxxb
|
|
ClassApplication = 64 // 01xxxxxxb
|
|
ClassContext = 128 // 10xxxxxxb
|
|
ClassPrivate = 192 // 11xxxxxxb
|
|
ClassBitmask = 192 // 11xxxxxxb
|
|
)
|
|
|
|
var ClassMap = map[uint8]string{
|
|
ClassUniversal: "Universal",
|
|
ClassApplication: "Application",
|
|
ClassContext: "Context",
|
|
ClassPrivate: "Private",
|
|
}
|
|
|
|
const (
|
|
TypePrimitive = 0 // xx0xxxxxb
|
|
TypeConstructed = 32 // xx1xxxxxb
|
|
TypeBitmask = 32 // xx1xxxxxb
|
|
)
|
|
|
|
var TypeMap = map[uint8]string{
|
|
TypePrimitive: "Primative",
|
|
TypeConstructed: "Constructed",
|
|
}
|
|
|
|
var Debug bool = false
|
|
|
|
func PrintBytes(buf []byte, indent string) {
|
|
data_lines := make([]string, (len(buf)/30)+1)
|
|
num_lines := make([]string, (len(buf)/30)+1)
|
|
|
|
for i, b := range buf {
|
|
data_lines[i/30] += fmt.Sprintf("%02x ", b)
|
|
num_lines[i/30] += fmt.Sprintf("%02d ", (i+1)%100)
|
|
}
|
|
|
|
for i := 0; i < len(data_lines); i++ {
|
|
fmt.Print(indent + data_lines[i] + "\n")
|
|
fmt.Print(indent + num_lines[i] + "\n\n")
|
|
}
|
|
}
|
|
|
|
func PrintPacket(p *Packet) {
|
|
printPacket(p, 0, false)
|
|
}
|
|
|
|
func printPacket(p *Packet, indent int, printBytes bool) {
|
|
indent_str := ""
|
|
|
|
for len(indent_str) != indent {
|
|
indent_str += " "
|
|
}
|
|
|
|
class_str := ClassMap[p.ClassType]
|
|
|
|
tagtype_str := TypeMap[p.TagType]
|
|
|
|
tag_str := fmt.Sprintf("0x%02X", p.Tag)
|
|
|
|
if p.ClassType == ClassUniversal {
|
|
tag_str = TagMap[p.Tag]
|
|
}
|
|
|
|
value := fmt.Sprint(p.Value)
|
|
description := ""
|
|
|
|
if p.Description != "" {
|
|
description = p.Description + ": "
|
|
}
|
|
|
|
fmt.Printf("%s%s(%s, %s, %s) Len=%d %q\n", indent_str, description, class_str, tagtype_str, tag_str, p.Data.Len(), value)
|
|
|
|
if printBytes {
|
|
PrintBytes(p.Bytes(), indent_str)
|
|
}
|
|
|
|
for _, child := range p.Children {
|
|
printPacket(child, indent+1, printBytes)
|
|
}
|
|
}
|
|
|
|
func resizeBuffer(in []byte, new_size uint64) (out []byte) {
|
|
out = make([]byte, new_size)
|
|
|
|
copy(out, in)
|
|
|
|
return
|
|
}
|
|
|
|
func readBytes(reader io.Reader, buf []byte) error {
|
|
idx := 0
|
|
buflen := len(buf)
|
|
|
|
if reader == nil {
|
|
return errors.New("reader was nil, aborting")
|
|
}
|
|
|
|
for idx < buflen {
|
|
n, err := reader.Read(buf[idx:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
idx += n
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func ReadPacket(reader io.Reader) (*Packet, error) {
|
|
buf := make([]byte, 2)
|
|
|
|
err := readBytes(reader, buf)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
idx := uint64(2)
|
|
datalen := uint64(buf[1])
|
|
|
|
if Debug {
|
|
fmt.Printf("Read: datalen = %d len(buf) = %d ", datalen, len(buf))
|
|
|
|
for _, b := range buf {
|
|
fmt.Printf("%02X ", b)
|
|
}
|
|
|
|
fmt.Printf("\n")
|
|
}
|
|
|
|
if datalen&128 != 0 {
|
|
a := datalen - 128
|
|
|
|
idx += a
|
|
buf = resizeBuffer(buf, 2+a)
|
|
|
|
err := readBytes(reader, buf[2:])
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
datalen = DecodeInteger(buf[2 : 2+a])
|
|
|
|
if Debug {
|
|
fmt.Printf("Read: a = %d idx = %d datalen = %d len(buf) = %d", a, idx, datalen, len(buf))
|
|
|
|
for _, b := range buf {
|
|
fmt.Printf("%02X ", b)
|
|
}
|
|
|
|
fmt.Printf("\n")
|
|
}
|
|
}
|
|
|
|
buf = resizeBuffer(buf, idx+datalen)
|
|
err = readBytes(reader, buf[idx:])
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if Debug {
|
|
fmt.Printf("Read: len( buf ) = %d idx=%d datalen=%d idx+datalen=%d\n", len(buf), idx, datalen, idx+datalen)
|
|
|
|
for _, b := range buf {
|
|
fmt.Printf("%02X ", b)
|
|
}
|
|
}
|
|
|
|
p := DecodePacket(buf)
|
|
|
|
return p, nil
|
|
}
|
|
|
|
func DecodeString(data []byte) (ret string) {
|
|
// for _, c := range data {
|
|
// ret += fmt.Sprintf("%c", c)
|
|
// }
|
|
|
|
return string(data)
|
|
}
|
|
|
|
func DecodeInteger(data []byte) (ret uint64) {
|
|
for _, i := range data {
|
|
ret = ret * 256
|
|
ret = ret + uint64(i)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func EncodeInteger(val uint64) []byte {
|
|
var out bytes.Buffer
|
|
|
|
found := false
|
|
|
|
shift := uint(56)
|
|
|
|
mask := uint64(0xFF00000000000000)
|
|
|
|
for mask > 0 {
|
|
if !found && (val&mask != 0) {
|
|
found = true
|
|
}
|
|
|
|
if found || (shift == 0) {
|
|
out.Write([]byte{byte((val & mask) >> shift)})
|
|
}
|
|
|
|
shift -= 8
|
|
mask = mask >> 8
|
|
}
|
|
|
|
return out.Bytes()
|
|
}
|
|
|
|
func DecodePacket(data []byte) *Packet {
|
|
p, _ := decodePacket(data)
|
|
|
|
return p
|
|
}
|
|
|
|
func decodePacket(data []byte) (*Packet, []byte) {
|
|
if Debug {
|
|
fmt.Printf("decodePacket: enter %d\n", len(data))
|
|
}
|
|
|
|
p := new(Packet)
|
|
|
|
p.ClassType = data[0] & ClassBitmask
|
|
p.TagType = data[0] & TypeBitmask
|
|
p.Tag = data[0] & TagBitmask
|
|
|
|
datalen := DecodeInteger(data[1:2])
|
|
datapos := uint64(2)
|
|
|
|
if datalen&128 != 0 {
|
|
datalen -= 128
|
|
datapos += datalen
|
|
datalen = DecodeInteger(data[2 : 2+datalen])
|
|
}
|
|
|
|
p.Data = new(bytes.Buffer)
|
|
|
|
p.Children = make([]*Packet, 0, 2)
|
|
|
|
p.Value = nil
|
|
|
|
value_data := data[datapos : datapos+datalen]
|
|
|
|
if p.TagType == TypeConstructed {
|
|
for len(value_data) != 0 {
|
|
var child *Packet
|
|
|
|
child, value_data = decodePacket(value_data)
|
|
p.AppendChild(child)
|
|
}
|
|
} else if p.ClassType == ClassUniversal {
|
|
p.Data.Write(data[datapos : datapos+datalen])
|
|
p.ByteValue = value_data
|
|
|
|
switch p.Tag {
|
|
case TagEOC:
|
|
case TagBoolean:
|
|
val := DecodeInteger(value_data)
|
|
|
|
p.Value = val != 0
|
|
case TagInteger:
|
|
p.Value = DecodeInteger(value_data)
|
|
case TagBitString:
|
|
case TagOctetString:
|
|
p.Value = DecodeString(value_data)
|
|
case TagNULL:
|
|
case TagObjectIdentifier:
|
|
case TagObjectDescriptor:
|
|
case TagExternal:
|
|
case TagRealFloat:
|
|
case TagEnumerated:
|
|
p.Value = DecodeInteger(value_data)
|
|
case TagEmbeddedPDV:
|
|
case TagUTF8String:
|
|
case TagRelativeOID:
|
|
case TagSequence:
|
|
case TagSet:
|
|
case TagNumericString:
|
|
case TagPrintableString:
|
|
p.Value = DecodeString(value_data)
|
|
case TagT61String:
|
|
case TagVideotexString:
|
|
case TagIA5String:
|
|
case TagUTCTime:
|
|
case TagGeneralizedTime:
|
|
case TagGraphicString:
|
|
case TagVisibleString:
|
|
case TagGeneralString:
|
|
case TagUniversalString:
|
|
case TagCharacterString:
|
|
case TagBMPString:
|
|
}
|
|
} else {
|
|
p.Data.Write(data[datapos : datapos+datalen])
|
|
}
|
|
|
|
return p, data[datapos+datalen:]
|
|
}
|
|
|
|
func (p *Packet) DataLength() uint64 {
|
|
return uint64(p.Data.Len())
|
|
}
|
|
|
|
func (p *Packet) Bytes() []byte {
|
|
var out bytes.Buffer
|
|
|
|
out.Write([]byte{p.ClassType | p.TagType | p.Tag})
|
|
packet_length := EncodeInteger(p.DataLength())
|
|
|
|
if p.DataLength() > 127 || len(packet_length) > 1 {
|
|
out.Write([]byte{byte(len(packet_length) | 128)})
|
|
out.Write(packet_length)
|
|
} else {
|
|
out.Write(packet_length)
|
|
}
|
|
|
|
out.Write(p.Data.Bytes())
|
|
|
|
return out.Bytes()
|
|
}
|
|
|
|
func (p *Packet) AppendChild(child *Packet) {
|
|
p.Data.Write(child.Bytes())
|
|
|
|
if len(p.Children) == cap(p.Children) {
|
|
newChildren := make([]*Packet, cap(p.Children)*2)
|
|
|
|
copy(newChildren, p.Children)
|
|
p.Children = newChildren[0:len(p.Children)]
|
|
}
|
|
|
|
p.Children = p.Children[0 : len(p.Children)+1]
|
|
p.Children[len(p.Children)-1] = child
|
|
}
|
|
|
|
func Encode(ClassType, TagType, Tag uint8, Value interface{}, Description string) *Packet {
|
|
p := new(Packet)
|
|
|
|
p.ClassType = ClassType
|
|
p.TagType = TagType
|
|
p.Tag = Tag
|
|
p.Data = new(bytes.Buffer)
|
|
|
|
p.Children = make([]*Packet, 0, 2)
|
|
|
|
p.Value = Value
|
|
p.Description = Description
|
|
|
|
if Value != nil {
|
|
v := reflect.ValueOf(Value)
|
|
|
|
if ClassType == ClassUniversal {
|
|
switch Tag {
|
|
case TagOctetString:
|
|
sv, ok := v.Interface().(string)
|
|
|
|
if ok {
|
|
p.Data.Write([]byte(sv))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return p
|
|
}
|
|
|
|
func NewSequence(Description string) *Packet {
|
|
return Encode(ClassUniversal, TypePrimitive, TagSequence, nil, Description)
|
|
}
|
|
|
|
func NewBoolean(ClassType, TagType, Tag uint8, Value bool, Description string) *Packet {
|
|
intValue := 0
|
|
|
|
if Value {
|
|
intValue = 1
|
|
}
|
|
|
|
p := Encode(ClassType, TagType, Tag, nil, Description)
|
|
|
|
p.Value = Value
|
|
p.Data.Write(EncodeInteger(uint64(intValue)))
|
|
|
|
return p
|
|
}
|
|
|
|
func NewInteger(ClassType, TagType, Tag uint8, Value uint64, Description string) *Packet {
|
|
p := Encode(ClassType, TagType, Tag, nil, Description)
|
|
|
|
p.Value = Value
|
|
p.Data.Write(EncodeInteger(Value))
|
|
|
|
return p
|
|
}
|
|
|
|
func NewString(ClassType, TagType, Tag uint8, Value, Description string) *Packet {
|
|
p := Encode(ClassType, TagType, Tag, nil, Description)
|
|
|
|
p.Value = Value
|
|
p.Data.Write([]byte(Value))
|
|
|
|
return p
|
|
}
|