diff options
Diffstat (limited to 'lib/hipe/test/bs_SUITE_data/bs_id3.erl')
-rw-r--r-- | lib/hipe/test/bs_SUITE_data/bs_id3.erl | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/hipe/test/bs_SUITE_data/bs_id3.erl b/lib/hipe/test/bs_SUITE_data/bs_id3.erl new file mode 100644 index 0000000000..a6152f05cd --- /dev/null +++ b/lib/hipe/test/bs_SUITE_data/bs_id3.erl @@ -0,0 +1,75 @@ +%% -*- erlang-indent-level: 2 -*- +%%========================================================================== +%% From: Tomas Stejskal -- 23/02/2008 +%% I've found some strange behavior regarding binary matching. The module's +%% purpose is reading an id3 version 1 or version 1.1 tag from an mp3 bin. +%% When I use the function read_v1_or_v11_tag on a mp3 binary containing +%% version 1 tag, it returns an error. However, when the function +%% read_only_v1_tag is applied on the same file, it reads the tag data +%% correctly. The only difference between these two functions is that the +%% former has an extra branch to read version 1.1 tag. +%% This was a BEAM compiler bug which was fixed by a patch to beam_dead. +%%========================================================================== + +-module(bs_id3). + +-export([test/0]). + +-define(BIN, <<84,65,71,68,117,154,105,232,107,121,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,68,97,110,105,101,108,32,76,97,110, + 100,97,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,66,101,115,116, + 32,79,102,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 50,48,48,48,50,48,48,48,32,45,32,66,101,115,116,32,79,102, + 32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,12>>). + +test() -> + R1 = parse_only_v1_tag(?BIN), + R2 = parse_v1_or_v11_tag(?BIN), + %% io:format("~p\n~p\n", [R1, R2]), + R1 = R2, % crash if not equal + ok. + +parse_only_v1_tag(<<"TAG", Title:30/binary, + Artist:30/binary, Album:30/binary, + _Year:4/binary, _Comment:30/binary, + _Genre:8>>) -> + {ok, + {"ID3v1", + [{title, trim(Title)}, + {artist, trim(Artist)}, + {album, trim(Album)}]}}; +parse_only_v1_tag(_) -> + error. + +parse_v1_or_v11_tag(<<"TAG", Title:30/binary, + Artist:30/binary, Album:30/binary, + _Year:4/binary, _Comment:28/binary, + 0:8, Track:8, _Genre:8>>) -> + {ok, + {"ID3v1.1", + [{track, Track}, {title, trim(Title)}, + {artist, trim(Artist)}, {album, trim(Album)}]}}; +parse_v1_or_v11_tag(<<"TAG", Title:30/binary, + Artist:30/binary, Album:30/binary, + _Year:4/binary, _Comment:30/binary, + _Genre:8>>) -> + {ok, + {"ID3v1", + [{title, trim(Title)}, + {artist, trim(Artist)}, + {album, trim(Album)}]}}; +parse_v1_or_v11_tag(_) -> + error. + +trim(Bin) -> + list_to_binary(trim_blanks(binary_to_list(Bin))). + +trim_blanks(L) -> + lists:reverse(skip_blanks_and_zero(lists:reverse(L))). + +skip_blanks_and_zero([$\s|T]) -> + skip_blanks_and_zero(T); +skip_blanks_and_zero([0|T]) -> + skip_blanks_and_zero(T); +skip_blanks_and_zero(L) -> + L. |