Add converting init to BitReader protocol

Author: tsolomko

Sources/BitReader.swift

@@ -20,7 +20,11 @@ public protocol BitReader: class {
     /// Creates an instance for reading bits (and bytes) from `data`.
     init(data: Data)
 
-    // TODO: Add `init(_ byteReader: ByteReader)`?
+    /**
+     Converts a `ByteReader` instance into `BitReader`, enabling bits reading capabilities. Current `offset` value of
+     `byteReader` is preserved.
+     */
+    init(_ byteReader: ByteReader)
 
     /// Reads bit and returns it, advancing by one BIT position.
     func bit() -> UInt8

Sources/LsbBitReader.swift

@@ -42,8 +42,8 @@ public final class LsbBitReader: ByteReader, BitReader {
     }
 
     /**
-     Converts a `ByteReader` instance into `LsbBitReader`, enabling bits reading capabilities.
-     Current `offset` value of `byteReader` is preserved.
+     Converts a `ByteReader` instance into `LsbBitReader`, enabling bit reading capabilities. Current `offset` value of
+     `byteReader` is preserved.
      */
     public init(_ byteReader: ByteReader) {
         self.currentByte = byteReader.offset < byteReader.data.endIndex ? byteReader.data[byteReader.offset] : 0

Sources/MsbBitReader.swift

@@ -42,8 +42,8 @@ public final class MsbBitReader: ByteReader, BitReader {
     }
 
     /**
-     Converts a `ByteReader` instance into `MsbBitReader`, enabling bit reading capabilities.
-     Current `offset` value of `byteReader` is preserved.
+     Converts a `ByteReader` instance into `MsbBitReader`, enabling bit reading capabilities. Current `offset` value of
+     `byteReader` is preserved.
      */
     public init(_ byteReader: ByteReader) {
         self.currentByte = byteReader.offset < byteReader.data.endIndex ? byteReader.data[byteReader.offset] : 0