mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-22 21:50:28 +00:00
352 lines
7.1 KiB
Go
352 lines
7.1 KiB
Go
package binary
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import (
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"fmt"
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"github.com/Rhymen/go-whatsapp/binary/token"
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"math"
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"strconv"
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"strings"
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)
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type binaryEncoder struct {
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data []byte
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}
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func NewEncoder() *binaryEncoder {
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return &binaryEncoder{make([]byte, 0)}
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}
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func (w *binaryEncoder) GetData() []byte {
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return w.data
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}
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func (w *binaryEncoder) pushByte(b byte) {
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w.data = append(w.data, b)
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}
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func (w *binaryEncoder) pushBytes(bytes []byte) {
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w.data = append(w.data, bytes...)
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}
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func (w *binaryEncoder) pushIntN(value, n int, littleEndian bool) {
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for i := 0; i < n; i++ {
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var curShift int
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if littleEndian {
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curShift = i
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} else {
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curShift = n - i - 1
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}
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w.pushByte(byte((value >> uint(curShift*8)) & 0xFF))
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}
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}
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func (w *binaryEncoder) pushInt20(value int) {
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w.pushBytes([]byte{byte((value >> 16) & 0x0F), byte((value >> 8) & 0xFF), byte(value & 0xFF)})
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}
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func (w *binaryEncoder) pushInt8(value int) {
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w.pushIntN(value, 1, false)
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}
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func (w *binaryEncoder) pushInt16(value int) {
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w.pushIntN(value, 2, false)
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}
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func (w *binaryEncoder) pushInt32(value int) {
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w.pushIntN(value, 4, false)
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}
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func (w *binaryEncoder) pushInt64(value int) {
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w.pushIntN(value, 8, false)
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}
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func (w *binaryEncoder) pushString(value string) {
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w.pushBytes([]byte(value))
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}
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func (w *binaryEncoder) writeByteLength(length int) error {
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if length > math.MaxInt32 {
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return fmt.Errorf("length is too large: %d", length)
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} else if length >= (1 << 20) {
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w.pushByte(token.BINARY_32)
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w.pushInt32(length)
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} else if length >= 256 {
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w.pushByte(token.BINARY_20)
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w.pushInt20(length)
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} else {
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w.pushByte(token.BINARY_8)
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w.pushInt8(length)
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}
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return nil
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}
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func (w *binaryEncoder) WriteNode(n Node) error {
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numAttributes := 0
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if n.Attributes != nil {
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numAttributes = len(n.Attributes)
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}
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hasContent := 0
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if n.Content != nil {
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hasContent = 1
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}
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w.writeListStart(2*numAttributes + 1 + hasContent)
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if err := w.writeString(n.Description, false); err != nil {
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return err
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}
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if err := w.writeAttributes(n.Attributes); err != nil {
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return err
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}
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if err := w.writeChildren(n.Content); err != nil {
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return err
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}
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return nil
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}
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func (w *binaryEncoder) writeString(tok string, i bool) error {
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if !i && tok == "c.us" {
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if err := w.writeToken(token.IndexOfSingleToken("s.whatsapp.net")); err != nil {
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return err
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}
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return nil
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}
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tokenIndex := token.IndexOfSingleToken(tok)
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if tokenIndex == -1 {
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jidSepIndex := strings.Index(tok, "@")
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if jidSepIndex < 1 {
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w.writeStringRaw(tok)
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} else {
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w.writeJid(tok[:jidSepIndex], tok[jidSepIndex+1:])
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}
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} else {
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if tokenIndex < token.SINGLE_BYTE_MAX {
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if err := w.writeToken(tokenIndex); err != nil {
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return err
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}
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} else {
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singleByteOverflow := tokenIndex - token.SINGLE_BYTE_MAX
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dictionaryIndex := singleByteOverflow >> 8
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if dictionaryIndex < 0 || dictionaryIndex > 3 {
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return fmt.Errorf("double byte dictionary token out of range: %v", tok)
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}
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if err := w.writeToken(token.DICTIONARY_0 + dictionaryIndex); err != nil {
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return err
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}
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if err := w.writeToken(singleByteOverflow % 256); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (w *binaryEncoder) writeStringRaw(value string) error {
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if err := w.writeByteLength(len(value)); err != nil {
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return err
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}
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w.pushString(value)
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return nil
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}
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func (w *binaryEncoder) writeJid(jidLeft, jidRight string) error {
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w.pushByte(token.JID_PAIR)
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if jidLeft != "" {
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if err := w.writePackedBytes(jidLeft); err != nil {
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return err
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}
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} else {
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if err := w.writeToken(token.LIST_EMPTY); err != nil {
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return err
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}
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}
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if err := w.writeString(jidRight, false); err != nil {
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return err
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}
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return nil
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}
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func (w *binaryEncoder) writeToken(tok int) error {
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if tok < len(token.SingleByteTokens) {
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w.pushByte(byte(tok))
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} else if tok <= 500 {
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return fmt.Errorf("invalid token: %d", tok)
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}
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return nil
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}
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func (w *binaryEncoder) writeAttributes(attributes map[string]string) error {
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if attributes == nil {
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return nil
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}
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for key, val := range attributes {
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if val == "" {
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continue
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}
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if err := w.writeString(key, false); err != nil {
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return err
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}
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if err := w.writeString(val, false); err != nil {
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return err
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}
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}
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return nil
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}
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func (w *binaryEncoder) writeChildren(children interface{}) error {
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if children == nil {
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return nil
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}
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switch childs := children.(type) {
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case string:
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if err := w.writeString(childs, true); err != nil {
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return err
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}
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case []byte:
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if err := w.writeByteLength(len(childs)); err != nil {
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return err
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}
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w.pushBytes(childs)
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case []Node:
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w.writeListStart(len(childs))
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for _, n := range childs {
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if err := w.WriteNode(n); err != nil {
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return err
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}
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}
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default:
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return fmt.Errorf("cannot write child of type: %T", children)
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}
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return nil
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}
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func (w *binaryEncoder) writeListStart(listSize int) {
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if listSize == 0 {
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w.pushByte(byte(token.LIST_EMPTY))
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} else if listSize < 256 {
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w.pushByte(byte(token.LIST_8))
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w.pushInt8(listSize)
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} else {
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w.pushByte(byte(token.LIST_16))
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w.pushInt16(listSize)
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}
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}
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func (w *binaryEncoder) writePackedBytes(value string) error {
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if err := w.writePackedBytesImpl(value, token.NIBBLE_8); err != nil {
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if err := w.writePackedBytesImpl(value, token.HEX_8); err != nil {
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return err
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}
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}
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return nil
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}
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func (w *binaryEncoder) writePackedBytesImpl(value string, dataType int) error {
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numBytes := len(value)
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if numBytes > token.PACKED_MAX {
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return fmt.Errorf("too many bytes to pack: %d", numBytes)
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}
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w.pushByte(byte(dataType))
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x := 0
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if numBytes%2 != 0 {
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x = 128
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}
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w.pushByte(byte(x | int(math.Ceil(float64(numBytes)/2.0))))
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for i, l := 0, numBytes/2; i < l; i++ {
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b, err := w.packBytePair(dataType, value[2*i:2*i+1], value[2*i+1:2*i+2])
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if err != nil {
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return err
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}
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w.pushByte(byte(b))
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}
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if (numBytes % 2) != 0 {
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b, err := w.packBytePair(dataType, value[numBytes-1:], "\x00")
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if err != nil {
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return err
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}
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w.pushByte(byte(b))
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}
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return nil
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}
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func (w *binaryEncoder) packBytePair(packType int, part1, part2 string) (int, error) {
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if packType == token.NIBBLE_8 {
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n1, err := packNibble(part1)
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if err != nil {
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return 0, err
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}
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n2, err := packNibble(part2)
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if err != nil {
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return 0, err
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}
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return (n1 << 4) | n2, nil
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} else if packType == token.HEX_8 {
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n1, err := packHex(part1)
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if err != nil {
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return 0, err
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}
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n2, err := packHex(part2)
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if err != nil {
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return 0, err
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}
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return (n1 << 4) | n2, nil
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} else {
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return 0, fmt.Errorf("invalid pack type (%d) for byte pair: %s / %s", packType, part1, part2)
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}
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}
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func packNibble(value string) (int, error) {
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if value >= "0" && value <= "9" {
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return strconv.Atoi(value)
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} else if value == "-" {
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return 10, nil
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} else if value == "." {
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return 11, nil
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} else if value == "\x00" {
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return 15, nil
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}
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return 0, fmt.Errorf("invalid string to pack as nibble: %v", value)
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}
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func packHex(value string) (int, error) {
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if (value >= "0" && value <= "9") || (value >= "A" && value <= "F") || (value >= "a" && value <= "f") {
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d, err := strconv.ParseInt(value, 16, 0)
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return int(d), err
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} else if value == "\x00" {
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return 15, nil
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}
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return 0, fmt.Errorf("invalid string to pack as hex: %v", value)
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}
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