From 41f536bd46b38e1f9e7a0a5f26b54570a656f1ea Mon Sep 17 00:00:00 2001
From: Alberto Restifo <alberto@restifo.dev>
Date: Sun, 19 Apr 2020 13:22:50 +0200
Subject: [PATCH] Add support for Binary decoding

---
 src/cbor/lexer.cr | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/cbor/lexer.cr b/src/cbor/lexer.cr
index 53261ff..ebd480b 100644
--- a/src/cbor/lexer.cr
+++ b/src/cbor/lexer.cr
@@ -70,6 +70,17 @@ class CBOR::Lexer
       consume_int(to_negative_int(read(UInt32)))
     when 0x3b
       consume_int(to_negative_int(read(UInt64)))
+    when 0x40..0x57
+      # Reads a single byte which is offset by 0x40
+      Token::BytesT.new(@current_byte_number, value: Bytes[current_byte - 0x40])
+    when 0x58
+      consume_binary(read(UInt8))
+    when 0x59
+      consume_binary(read(UInt16))
+    when 0x5a
+      consume_binary(read(UInt32))
+    when 0x5b
+      consume_binary(read(UInt64))
     else
       fail
     end
@@ -86,6 +97,16 @@ class CBOR::Lexer
     Token::IntT.new(@current_byte_number, value)
   end
 
+  private def consume_binary(size)
+    bytes = Bytes.new(size)
+    @io.read_fully(bytes)
+    @byte_number += size
+    Token::BytesT.new(@current_byte_number, bytes)
+  end
+
+  # Creates a method overloaded for each UInt sizes to convert the UInt into
+  # the respective Int capable of containing the value
+
   {% begin %}
     {% uints = %w(UInt8 UInt16 UInt32 UInt64) %}
     {% conv = %w(to_i8 to_i16 to_i32 to_i64 to_i128) %}