File 6511-Add-hex-encoding-fonctions-on-the-binary-m... of Package erlang

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File 6511-Add-hex-encoding-fonctions-on-the-binary-module.patch of Package erlang

From 46abba5683b9641676b00d91ce5592669e997944 Mon Sep 17 00:00:00 2001
From: gearnode <bryan@frimin.fr>
Date: Fri, 29 Jan 2021 19:40:40 +0100
Subject: [PATCH 1/2] Add hex encoding fonctions on the binary module

Dealing with hex format is frequent in many codebases. At this time, we
all copy-paste similar helper in our codebases to encode and decode a
hex-encoded binary.
---
 lib/stdlib/doc/src/binary.xml           | 28 +++++++++++
 lib/stdlib/src/binary.erl               | 64 +++++++++++++++++++++++--
 lib/stdlib/src/erl_stdlib_errors.erl    | 19 ++++++++
 lib/stdlib/test/binary_module_SUITE.erl | 45 +++++++++++++++--
 lib/stdlib/test/error_info_lib.erl      | 11 +++--
 5 files changed, 157 insertions(+), 10 deletions(-)

diff --git a/lib/stdlib/doc/src/binary.xml b/lib/stdlib/doc/src/binary.xml
index 412a0f5def..1426921ede 100644
--- a/lib/stdlib/doc/src/binary.xml
+++ b/lib/stdlib/doc/src/binary.xml
@@ -243,6 +243,34 @@
 </func>
 
 <func>
+ <name name="encode_hex" arity="1" since=""/>
+ <fsummary>Encodes a binary into a hex encoded binary.</fsummary>
+ <desc>
+ Encodes a binary into a hex encoded binary.
+
+ Example:
+
+ <code>
+1> binary:encode_hex(&lt;&lt;"f"&gt;&gt;).
+&lt;&lt;"66"&gt;&gt;</code>
+ </desc>
+ </func>
+
+ <func>
+ <name name="decode_hex" arity="1" since=""/>
+ <fsummary>Decodes a hex encoded binary into a binary.</fsummary>
+ <desc>
+ Decodes a hex encoded binary into a binary.
+
+ Example
+
+ <code>
+1> binary:decode_hex(&lt;&lt;"66"&gt;&gt;).
+&lt;&lt;"f"&gt;&gt;</code>
+ </desc>
+ </func>
+
+ <func>
 <name name="first" arity="1" since="OTP R14B"/>
 <fsummary>Return the first byte of a binary.</fsummary>
 <desc>
diff --git a/lib/stdlib/src/binary.erl b/lib/stdlib/src/binary.erl
index eb5f225a98..73b619d192 100644
--- a/lib/stdlib/src/binary.erl
+++ b/lib/stdlib/src/binary.erl
@@ -20,7 +20,8 @@
 -module(binary).
 %%
 %% Implemented in this module:
--export([replace/3,replace/4]).
+-export([replace/3,replace/4,
+ encode_hex/1, decode_hex/1]).
 
 -export_type([cp/0]).
 
@@ -314,8 +315,6 @@ splitat(H,N,[]) ->
 splitat(H,N,[I|T]) ->
 [binary:part(H,{N,I-N})|splitat(H,I,T)].
 
-
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% Simple helper functions
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -331,3 +330,61 @@ get_opts_replace([{insert_replaced,N} | T],{Part,Global,_Insert}) ->
 get_opts_replace(_,_) ->
 throw(badopt).
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Hex encoding functions
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-spec encode_hex(Bin) -> Bin2 when
+ Bin :: binary(),
+ Bin2 :: binary().
+encode_hex(Bin) when is_binary(Bin) ->
+ encode_hex(Bin, <<>>);
+encode_hex(Bin) ->
+ error(badarg, [Bin]).
+
+-spec encode_hex(Bin, Acc) -> Bin2 when
+ Bin :: binary(),
+ Acc :: binary(),
+ Bin2 :: Acc.
+encode_hex(<<>>, Acc) ->
+ Acc;
+encode_hex(<<A0:4, B0:4, Rest/binary>>, Acc) ->
+ A = encode_hex_digit(A0),
+ B = encode_hex_digit(B0),
+ encode_hex(Rest, <<Acc/binary, A, B>>).
+
+-spec encode_hex_digit(0..15) -> byte().
+encode_hex_digit(Char) when Char =< 9 ->
+ Char + $0;
+encode_hex_digit(Char) when Char =< 15 ->
+ Char + $A - 10.
+
+-spec decode_hex(Bin) -> Bin2 when
+ Bin :: binary(),
+ Bin2 :: binary().
+decode_hex(Bin) when is_binary(Bin) ->
+ decode_hex(Bin, <<>>);
+decode_hex(Bin) ->
+ error(badarg, [Bin]).
+
+-spec decode_hex(Bin, Acc) -> Bin2 when
+ Bin :: binary(),
+ Acc :: binary(),
+ Bin2 :: Acc.
+decode_hex(<<>>, Acc) ->
+ Acc;
+decode_hex(<<A0:8, B0:8, Rest/binary>>, Acc) ->
+ A = decode_hex_char(A0),
+ B = decode_hex_char(B0),
+ decode_hex(Rest, <<Acc/binary, A:4, B:4>>);
+decode_hex(Bin, _Acc) ->
+ error(badarg, [Bin]).
+
+-spec decode_hex_char($A..$F | $a..$f | $0..$9) -> 0..15.
+decode_hex_char(Char) when Char >= $a, Char =< $f ->
+ Char - $a + 10;
+decode_hex_char(Char) when Char >= $A, Char =< $F ->
+ Char - $A + 10;
+decode_hex_char(Char) when Char >= $0, Char =< $9 ->
+ Char - $0;
+decode_hex_char(Char) ->
+ error(badarg, [Char]).
diff --git a/lib/stdlib/test/binary_module_SUITE.erl b/lib/stdlib/test/binary_module_SUITE.erl
index 2af4583d8b..70e100c9e6 100644
--- a/lib/stdlib/test/binary_module_SUITE.erl
+++ b/lib/stdlib/test/binary_module_SUITE.erl
@@ -23,7 +23,7 @@
 	 interesting/1,scope_return/1,random_ref_comp/1,random_ref_sr_comp/1,
 	 random_ref_fla_comp/1,parts/1, bin_to_list/1, list_to_bin/1,
 	 copy/1, referenced/1,guard/1,encode_decode/1,badargs/1,longest_common_trap/1,
- check_no_invalid_read_bug/1]).
+ check_no_invalid_read_bug/1, hex_encoding/1]).
 
 -export([random_number/1, make_unaligned/1]).
 
@@ -37,12 +37,12 @@ all() ->
 [scope_return,interesting, random_ref_fla_comp, random_ref_sr_comp,
 random_ref_comp, parts, bin_to_list, list_to_bin, copy,
 referenced, guard, encode_decode, badargs,
- longest_common_trap, check_no_invalid_read_bug].
+ longest_common_trap, check_no_invalid_read_bug,
+ hex_encoding].
 
 
 -define(MASK_ERROR(EXPR),mask_error((catch (EXPR)))).
 
-
 %% Test various badarg exceptions in the module.
 badargs(Config) when is_list(Config) ->
 badarg = ?MASK_ERROR(binary:compile_pattern([<<1,2,3:3>>])),
@@ -237,6 +237,12 @@ badargs(Config) when is_list(Config) ->
 badarg =
 	?MASK_ERROR(
 	 binary:at([1,2,4],2)),
+
+ badarg = ?MASK_ERROR(binary:encode_hex("abc")),
+ badarg = ?MASK_ERROR(binary:encode_hex(123)),
+ badarg = ?MASK_ERROR(binary:encode_hex([])),
+ badarg = ?MASK_ERROR(binary:encode_hex(#{})),
+ badarg = ?MASK_ERROR(binary:encode_hex(foo)),
 ok.
 
 %% Whitebox test to force special trap conditions in
@@ -1373,3 +1379,30 @@ check_no_invalid_read_bug(I) ->
 binary:encode_unsigned(N+N),
 binary:encode_unsigned(N+N, little),
 check_no_invalid_read_bug(I+1).
+
+hex_encoding(Config) when is_list(Config) ->
+ %% Vector test imported from the RFC 4648 section 10.
+ <<>> = binary:encode_hex(<<>>),
+ <<"66">> = binary:encode_hex(<<"f">>),
+ <<"666F">> = binary:encode_hex(<<"fo">>),
+ <<"666F6F">> = binary:encode_hex(<<"foo">>),
+ <<"666F6F62">> = binary:encode_hex(<<"foob">>),
+ <<"666F6F6261">> = binary:encode_hex(<<"fooba">>),
+ <<"666F6F626172">> = binary:encode_hex(<<"foobar">>),
+
+ <<>> = binary:decode_hex(<<>>),
+ <<"f">> = binary:decode_hex(<<"66">>),
+ <<"fo">> = binary:decode_hex(<<"666F">>),
+ <<"foo">> = binary:decode_hex(<<"666F6F">>),
+ <<"foob">> = binary:decode_hex(<<"666F6F62">>),
+ <<"fooba">> = binary:decode_hex(<<"666F6F6261">>),
+ <<"foobar">> = binary:decode_hex(<<"666F6F626172">>),
+
+ <<"fo">> = binary:decode_hex(<<"666f">>),
+ <<"foo">> = binary:decode_hex(<<"666f6f">>),
+ <<"foob">> = binary:decode_hex(<<"666f6f62">>),
+ <<"fooba">> = binary:decode_hex(<<"666f6f6261">>),
+ <<"foobar">> = binary:decode_hex(<<"666f6f626172">>),
+
+ <<"foobar">> = binary:decode_hex(<<"666f6F626172">>),
+ ok.
-- 
2.35.3

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