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File 3561-base64-introduce-new-types-for-base64-alphabet.patch of Package erlang (Revision a2c746346df91f7eba485155dba10e85)

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From 919435a6bd07420faffa9ac851f5c254ba6d96be Mon Sep 17 00:00:00 2001
From: Maxim Fedorov <dane@whatsapp.com>
Date: Thu, 22 Apr 2021 09:26:05 -0700
Subject: [PATCH] base64: introduce new types for base64 alphabet

No change in logic, but specs are updated to reflect RFC 4648 compliance.
---
 lib/stdlib/doc/src/base64.xml | 19 ++++++++++++++----
 lib/stdlib/src/base64.erl     | 37 +++++++++++++++++++++--------------
 2 files changed, 37 insertions(+), 19 deletions(-)

diff --git a/lib/stdlib/doc/src/base64.xml b/lib/stdlib/doc/src/base64.xml
index 2b50f03bbd..74773ab0ca 100644
--- a/lib/stdlib/doc/src/base64.xml
+++ b/lib/stdlib/doc/src/base64.xml
@@ -39,12 +39,23 @@
 
 <datatypes>
 <datatype>
- <name name="ascii_string"/>
+ <name name="base64_alphabet"/>
+ <desc>Base 64 Encoding alphabet, see <url href="https://www.ietf.org/rfc/rfc4648.txt">RFC 4648</url>.
+ </desc>
+ </datatype>
+ <datatype>
+ <name name="base64_string"/>
+ <desc>Base 64 encoded string.
+ </desc>
+ </datatype>
+ <datatype>
+ <name name="base64_binary"/>
+ <desc>Base 64 encoded binary.
+ </desc>
 </datatype>
 <datatype>
- <name name="ascii_binary"/>
- <desc>A <c>binary()</c> with ASCII characters in the range 1 to
- 255.
+ <name name="byte_string"/>
+ <desc>Arbitrary sequences of octets.
 </desc>
 </datatype>
 </datatypes>
diff --git a/lib/stdlib/src/base64.erl b/lib/stdlib/src/base64.erl
index 6ea4147abf..e2993cba9d 100644
--- a/lib/stdlib/src/base64.erl
+++ b/lib/stdlib/src/base64.erl
@@ -24,14 +24,21 @@
 -export([encode/1, decode/1, mime_decode/1,
 	 encode_to_string/1, decode_to_string/1, mime_decode_to_string/1]).
 
+
+%% RFC 4648: Base 64 Encoding alphabet
+-type base64_alphabet() :: $A..$Z | $a..$z | $0..$9 | $+ | $/ | $=.
+
 %% The following type is a subtype of string() for return values
-%% of (some) functions of this module.
--type ascii_string() :: [1..255].
--type ascii_binary() :: binary().
+%% of encoding functions.
+-type base64_string() :: [base64_alphabet()].
+-type base64_binary() :: binary().
+
+%% Decoded sequence of octets
+-type byte_string() :: [byte()].
 
 -spec encode_to_string(Data) -> Base64String when
- Data :: ascii_string() | ascii_binary(),
- Base64String :: ascii_string().
+ Data :: byte_string() | binary(),
+ Base64String :: base64_string().
 
 encode_to_string(Bin) when is_binary(Bin) ->
 encode_to_string(binary_to_list(Bin));
@@ -39,8 +46,8 @@ encode_to_string(List) when is_list(List) ->
 encode_list_to_string(List).
 
 -spec encode(Data) -> Base64 when
- Data :: ascii_string() | ascii_binary(),
- Base64 :: ascii_binary().
+ Data :: byte_string() | binary(),
+ Base64 :: base64_binary().
 
 encode(Bin) when is_binary(Bin) ->
 encode_binary(Bin, <<>>);
@@ -99,8 +106,8 @@ encode_list([B1,B2,B3|Ls], A) ->
 %% converting, whereas decode crashes if an illegal character is found
 
 -spec decode(Base64) -> Data when
- Base64 :: ascii_string() | ascii_binary(),
- Data :: ascii_binary().
+ Base64 :: base64_string() | base64_binary(),
+ Data :: binary().
 
 decode(Bin) when is_binary(Bin) ->
 decode_binary(Bin, <<>>);
@@ -108,8 +115,8 @@ decode(List) when is_list(List) ->
 decode_list(List, <<>>).
 
 -spec mime_decode(Base64) -> Data when
- Base64 :: ascii_string() | ascii_binary(),
- Data :: ascii_binary().
+ Base64 :: base64_string() | base64_binary(),
+ Data :: binary().
 
 mime_decode(Bin) when is_binary(Bin) ->
 mime_decode_binary(Bin, <<>>);
@@ -121,8 +128,8 @@ mime_decode(List) when is_list(List) ->
 %% character is found
 
 -spec decode_to_string(Base64) -> DataString when
- Base64 :: ascii_string() | ascii_binary(),
- DataString :: ascii_string().
+ Base64 :: base64_string() | base64_binary(),
+ DataString :: byte_string().
 
 decode_to_string(Bin) when is_binary(Bin) ->
 decode_to_string(binary_to_list(Bin));
@@ -130,8 +137,8 @@ decode_to_string(List) when is_list(List) ->
 decode_list_to_string(List).
 
 -spec mime_decode_to_string(Base64) -> DataString when
- Base64 :: ascii_string() | ascii_binary(),
- DataString :: ascii_string().
+ Base64 :: base64_string() | base64_binary(),
+ DataString :: byte_string().
 
 mime_decode_to_string(Bin) when is_binary(Bin) ->
 mime_decode_to_string(binary_to_list(Bin));
-- 
2.26.2

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