Direct proxy works

_utils/read_current_data.go

@@ -0,0 +1,21 @@
+package utils
+
+import "io"
+
+const readCurrentDataBufferSize = 1024 + 1 // + 1 because telegram operates with blocks mod 4
+
+// ReadCurrentData reads all data from io.Reader which is ready to be read.
+func ReadCurrentData(src io.Reader) (rv []byte, err error) {
+	buf := make([]byte, readCurrentDataBufferSize)
+	n := readCurrentDataBufferSize
+
+	for n == len(buf) {
+		n, err = src.Read(buf)
+		if err != nil {
+			return nil, err
+		}
+		rv = append(rv, buf[:n]...)
+	}
+
+	return rv, nil
+}

_utils/reverse_bytes.go

@@ -0,0 +1,15 @@
+package utils
+
+// ReverseBytes is a common slice reverser.
+func ReverseBytes(data []byte) []byte {
+	dataLen := len(data)
+	rv := make([]byte, dataLen)
+
+	rv[dataLen/2] = data[dataLen/2]
+	for i := dataLen/2 - 1; i >= 0; i-- {
+		opp := dataLen - i - 1
+		rv[i], rv[opp] = data[opp], data[i]
+	}
+
+	return rv
+}

_utils/uint24.go

@@ -0,0 +1,15 @@
+package utils
+
+// Uint24 is a replacement for the absent Go uint24 data type.
+// This data type is little endian.
+type Uint24 [3]byte
+
+// ToUint24 converts number to Uint24.
+func ToUint24(number uint32) Uint24 {
+	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)}
+}
+
+// FromUint24 converts Uint24 to number.
+func FromUint24(number Uint24) uint32 {
+	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16)
+}