Start to rewrite

utils/read_current_data.go

@@ -2,7 +2,7 @@ package utils
 
 import "io"
 
-const readCurrentDataBufferSize = 1024 + 1
+const readCurrentDataBufferSize = 1024 + 1 // + 1 because telegram operates with blocks mod 4
 
 func ReadCurrentData(src io.Reader) (rv []byte, err error) {
 	buf := make([]byte, readCurrentDataBufferSize)

utils/reverse_bytes.go

@@ -0,0 +1,14 @@
+package utils
+
+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 +1,11 @@
+package utils
+
+type Uint24 [3]byte
+
+func ToUint24(number uint32) Uint24 {
+	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)}
+}
+
+func FromUint24(number Uint24) uint32 {
+	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16)
+}