1 files changed, 388 insertions, 0 deletions
diff --git a/vendor/github.com/Rhymen/go-whatsapp/binary/decoder.go b/vendor/github.com/Rhymen/go-whatsapp/binary/decoder.go
new file mode 100644
index 00000000..95da606c
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/binary/decoder.go
@@ -0,0 +1,388 @@
+package binary
+
+import (
+	"fmt"
+	"github.com/Rhymen/go-whatsapp/binary/token"
+	"io"
+	"strconv"
+)
+
+type binaryDecoder struct {
+	data  []byte
+	index int
+}
+
+func NewDecoder(data []byte) *binaryDecoder {
+	return &binaryDecoder{data, 0}
+}
+
+func (r *binaryDecoder) checkEOS(length int) error {
+	if r.index+length > len(r.data) {
+		return io.EOF
+	}
+
+	return nil
+}
+
+func (r *binaryDecoder) readByte() (byte, error) {
+	if err := r.checkEOS(1); err != nil {
+		return 0, err
+	}
+
+	b := r.data[r.index]
+	r.index++
+
+	return b, nil
+}
+
+func (r *binaryDecoder) readIntN(n int, littleEndian bool) (int, error) {
+	if err := r.checkEOS(n); err != nil {
+		return 0, err
+	}
+
+	var ret int
+
+	for i := 0; i < n; i++ {
+		var curShift int
+		if littleEndian {
+			curShift = i
+		} else {
+			curShift = n - i - 1
+		}
+		ret |= int(r.data[r.index+i]) << uint(curShift*8)
+	}
+
+	r.index += n
+	return ret, nil
+}
+
+func (r *binaryDecoder) readInt8(littleEndian bool) (int, error) {
+	return r.readIntN(1, littleEndian)
+}
+
+func (r *binaryDecoder) readInt16(littleEndian bool) (int, error) {
+	return r.readIntN(2, littleEndian)
+}
+
+func (r *binaryDecoder) readInt20() (int, error) {
+	if err := r.checkEOS(3); err != nil {
+		return 0, err
+	}
+
+	ret := ((int(r.data[r.index]) & 15) << 16) + (int(r.data[r.index+1]) << 8) + int(r.data[r.index+2])
+	r.index += 3
+	return ret, nil
+}
+
+func (r *binaryDecoder) readInt32(littleEndian bool) (int, error) {
+	return r.readIntN(4, littleEndian)
+}
+
+func (r *binaryDecoder) readInt64(littleEndian bool) (int, error) {
+	return r.readIntN(8, littleEndian)
+}
+
+func (r *binaryDecoder) readPacked8(tag int) (string, error) {
+	startByte, err := r.readByte()
+	if err != nil {
+		return "", err
+	}
+
+	ret := ""
+
+	for i := 0; i < int(startByte&127); i++ {
+		currByte, err := r.readByte()
+		if err != nil {
+			return "", err
+		}
+
+		lower, err := unpackByte(tag, currByte&0xF0>>4)
+		if err != nil {
+			return "", err
+		}
+
+		upper, err := unpackByte(tag, currByte&0x0F)
+		if err != nil {
+			return "", err
+		}
+
+		ret += lower + upper
+	}
+
+	if startByte>>7 != 0 {
+		ret = ret[:len(ret)-1]
+	}
+	return ret, nil
+}
+
+func unpackByte(tag int, value byte) (string, error) {
+	switch tag {
+	case token.NIBBLE_8:
+		return unpackNibble(value)
+	case token.HEX_8:
+		return unpackHex(value)
+	default:
+		return "", fmt.Errorf("unpackByte with unknown tag %d", tag)
+	}
+}
+
+func unpackNibble(value byte) (string, error) {
+	switch {
+	case value < 0 || value > 15:
+		return "", fmt.Errorf("unpackNibble with value %d", value)
+	case value == 10:
+		return "-", nil
+	case value == 11:
+		return ".", nil
+	case value == 15:
+		return "\x00", nil
+	default:
+		return strconv.Itoa(int(value)), nil
+	}
+}
+
+func unpackHex(value byte) (string, error) {
+	switch {
+	case value < 0 || value > 15:
+		return "", fmt.Errorf("unpackHex with value %d", value)
+	case value < 10:
+		return strconv.Itoa(int(value)), nil
+	default:
+		return string('A' + value - 10), nil
+	}
+}
+
+func (r *binaryDecoder) readListSize(tag int) (int, error) {
+	switch tag {
+	case token.LIST_EMPTY:
+		return 0, nil
+	case token.LIST_8:
+		return r.readInt8(false)
+	case token.LIST_16:
+		return r.readInt16(false)
+	default:
+		return 0, fmt.Errorf("readListSize with unknown tag %d at position %d", tag, r.index)
+	}
+}
+
+func (r *binaryDecoder) readString(tag int) (string, error) {
+	switch {
+	case tag >= 3 && tag <= len(token.SingleByteTokens):
+		tok, err := token.GetSingleToken(tag)
+		if err != nil {
+			return "", err
+		}
+
+		if tok == "s.whatsapp.net" {
+			tok = "c.us"
+		}
+
+		return tok, nil
+	case tag == token.DICTIONARY_0 || tag == token.DICTIONARY_1 || tag == token.DICTIONARY_2 || tag == token.DICTIONARY_3:
+		i, err := r.readInt8(false)
+		if err != nil {
+			return "", err
+		}
+
+		return token.GetDoubleToken(tag-token.DICTIONARY_0, i)
+	case tag == token.LIST_EMPTY:
+		return "", nil
+	case tag == token.BINARY_8:
+		length, err := r.readInt8(false)
+		if err != nil {
+			return "", err
+		}
+
+		return r.readStringFromChars(length)
+	case tag == token.BINARY_20:
+		length, err := r.readInt20()
+		if err != nil {
+			return "", err
+		}
+
+		return r.readStringFromChars(length)
+	case tag == token.BINARY_32:
+		length, err := r.readInt32(false)
+		if err != nil {
+			return "", err
+		}
+
+		return r.readStringFromChars(length)
+	case tag == token.JID_PAIR:
+		b, err := r.readByte()
+		if err != nil {
+			return "", err
+		}
+		i, err := r.readString(int(b))
+		if err != nil {
+			return "", err
+		}
+
+		b, err = r.readByte()
+		if err != nil {
+			return "", err
+		}
+		j, err := r.readString(int(b))
+		if err != nil {
+			return "", err
+		}
+
+		if i == "" || j == "" {
+			return "", fmt.Errorf("invalid jid pair: %s - %s", i, j)
+		}
+
+		return i + "@" + j, nil
+	case tag == token.NIBBLE_8 || tag == token.HEX_8:
+		return r.readPacked8(tag)
+	default:
+		return "", fmt.Errorf("invalid string with tag %d", tag)
+	}
+}
+
+func (r *binaryDecoder) readStringFromChars(length int) (string, error) {
+	if err := r.checkEOS(length); err != nil {
+		return "", err
+	}
+
+	ret := r.data[r.index : r.index+length]
+	r.index += length
+
+	return string(ret), nil
+}
+
+func (r *binaryDecoder) readAttributes(n int) (map[string]string, error) {
+	if n == 0 {
+		return nil, nil
+	}
+
+	ret := make(map[string]string)
+	for i := 0; i < n; i++ {
+		idx, err := r.readInt8(false)
+		if err != nil {
+			return nil, err
+		}
+
+		index, err := r.readString(idx)
+		if err != nil {
+			return nil, err
+		}
+
+		idx, err = r.readInt8(false)
+		if err != nil {
+			return nil, err
+		}
+
+		ret[index], err = r.readString(idx)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return ret, nil
+}
+
+func (r *binaryDecoder) readList(tag int) ([]Node, error) {
+	size, err := r.readListSize(tag)
+	if err != nil {
+		return nil, err
+	}
+
+	ret := make([]Node, size)
+	for i := 0; i < size; i++ {
+		n, err := r.ReadNode()
+
+		if err != nil {
+			return nil, err
+		}
+
+		ret[i] = *n
+	}
+
+	return ret, nil
+}
+
+func (r *binaryDecoder) ReadNode() (*Node, error) {
+	ret := &Node{}
+
+	size, err := r.readInt8(false)
+	if err != nil {
+		return nil, err
+	}
+	listSize, err := r.readListSize(size)
+	if err != nil {
+		return nil, err
+	}
+
+	descrTag, err := r.readInt8(false)
+	if descrTag == token.STREAM_END {
+		return nil, fmt.Errorf("unexpected stream end")
+	}
+	ret.Description, err = r.readString(descrTag)
+	if err != nil {
+		return nil, err
+	}
+	if listSize == 0 || ret.Description == "" {
+		return nil, fmt.Errorf("invalid Node")
+	}
+
+	ret.Attributes, err = r.readAttributes((listSize - 1) >> 1)
+	if err != nil {
+		return nil, err
+	}
+
+	if listSize%2 == 1 {
+		return ret, nil
+	}
+
+	tag, err := r.readInt8(false)
+	if err != nil {
+		return nil, err
+	}
+
+	switch tag {
+	case token.LIST_EMPTY, token.LIST_8, token.LIST_16:
+		ret.Content, err = r.readList(tag)
+	case token.BINARY_8:
+		size, err = r.readInt8(false)
+		if err != nil {
+			return nil, err
+		}
+
+		ret.Content, err = r.readBytes(size)
+	case token.BINARY_20:
+		size, err = r.readInt20()
+		if err != nil {
+			return nil, err
+		}
+
+		ret.Content, err = r.readBytes(size)
+	case token.BINARY_32:
+		size, err = r.readInt32(false)
+		if err != nil {
+			return nil, err
+		}
+
+		ret.Content, err = r.readBytes(size)
+	default:
+		ret.Content, err = r.readString(tag)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+func (r *binaryDecoder) readBytes(n int) ([]byte, error) {
+	ret := make([]byte, n)
+	var err error
+
+	for i := range ret {
+		ret[i], err = r.readByte()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return ret, nil
+}