diff options
Diffstat (limited to 'erts/preloaded/src/zlib.erl')
| -rw-r--r-- | erts/preloaded/src/zlib.erl | 687 |
1 files changed, 395 insertions, 292 deletions
diff --git a/erts/preloaded/src/zlib.erl b/erts/preloaded/src/zlib.erl index 8cd3e39fd7..2731dddcb5 100644 --- a/erts/preloaded/src/zlib.erl +++ b/erts/preloaded/src/zlib.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2003-2016. All Rights Reserved. +%% Copyright Ericsson AB 2003-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -21,19 +21,29 @@ -module(zlib). -export([open/0,close/1,deflateInit/1,deflateInit/2,deflateInit/6, - deflateSetDictionary/2,deflateReset/1,deflateParams/3, - deflate/2,deflate/3,deflateEnd/1, - inflateInit/1,inflateInit/2, - inflateSetDictionary/2,inflateGetDictionary/1, - inflateSync/1,inflateReset/1,inflate/2,inflateEnd/1, - inflateChunk/1, inflateChunk/2, - setBufSize/2,getBufSize/1, - crc32/1,crc32/2,crc32/3,adler32/2,adler32/3,getQSize/1, - crc32_combine/4,adler32_combine/4, - compress/1,uncompress/1,zip/1,unzip/1, - gzip/1,gunzip/1]). - --export_type([zstream/0, zlevel/0, zwindowbits/0, zmemlevel/0, zstrategy/0]). + deflateSetDictionary/2,deflateReset/1,deflateParams/3, + deflate/2,deflate/3,deflateEnd/1, + inflateInit/1,inflateInit/2, + inflateSetDictionary/2,inflateGetDictionary/1, inflateReset/1, + inflate/2,inflate/3,inflateEnd/1, + inflateChunk/2,inflateChunk/1, + safeInflate/2, + setBufSize/2,getBufSize/1, + crc32/1,crc32/2,crc32/3,adler32/2,adler32/3, + crc32_combine/4,adler32_combine/4, + compress/1,uncompress/1,zip/1,unzip/1, + gzip/1,gunzip/1]). + +-export([on_load/0]). + +%% These are soft-deprecated until OTP 21. +% -deprecated([inflateChunk/1, inflateChunk/2, +% getBufSize/1, setBufSize/2, +% crc32/1,crc32/2,crc32/3,adler32/2,adler32/3, +% crc32_combine/4,adler32_combine/4]). + +-export_type([zstream/0, zflush/0, zlevel/0, zwindowbits/0, zmemlevel/0, + zstrategy/0]). %% flush argument encoding -define(Z_NO_FLUSH, 0). @@ -56,116 +66,76 @@ %% deflate compression method -define(Z_DEFLATED, 8). --define(Z_NULL, 0). - -define(MAX_WBITS, 15). -%% gzip defs (rfc 1952) - --define(ID1, 16#1f). --define(ID2, 16#8b). - --define(FTEXT, 16#01). --define(FHCRC, 16#02). --define(FEXTRA, 16#04). --define(FNAME, 16#08). --define(FCOMMENT, 16#10). --define(RESERVED, 16#E0). - --define(OS_MDDOS, 0). --define(OS_AMIGA, 1). --define(OS_OPENVMS, 2). --define(OS_UNIX, 3). --define(OS_VMCMS, 4). --define(OS_ATARI, 5). --define(OS_OS2, 6). --define(OS_MAC, 7). --define(OS_ZSYS, 8). --define(OS_CPM, 9). --define(OS_TOP20, 10). --define(OS_NTFS, 11). --define(OS_QDOS, 12). --define(OS_ACORN, 13). --define(OS_UNKNOWN,255). - --define(DEFLATE_INIT, 1). --define(DEFLATE_INIT2, 2). --define(DEFLATE_SETDICT, 3). --define(DEFLATE_RESET, 4). --define(DEFLATE_END, 5). --define(DEFLATE_PARAMS, 6). --define(DEFLATE, 7). - --define(INFLATE_INIT, 8). --define(INFLATE_INIT2, 9). --define(INFLATE_SETDICT, 10). --define(INFLATE_GETDICT, 11). --define(INFLATE_SYNC, 12). --define(INFLATE_RESET, 13). --define(INFLATE_END, 14). --define(INFLATE, 15). --define(INFLATE_CHUNK, 26). - --define(CRC32_0, 16). --define(CRC32_1, 17). --define(CRC32_2, 18). - --define(SET_BUFSZ, 19). --define(GET_BUFSZ, 20). --define(GET_QSIZE, 21). - --define(ADLER32_1, 22). --define(ADLER32_2, 23). - --define(CRC32_COMBINE, 24). --define(ADLER32_COMBINE, 25). +%% Chunk sizes are hardcoded on account of them screwing with the +%% predictability of the system. zlib is incapable of trapping so we need to +%% ensure that it never operates on any significant amount of data. +-define(DEFLATE_IN_CHUNKSIZE, 8 bsl 10). +-define(DEFLATE_OUT_CHUNKSIZE, 8 bsl 10). +-define(INFLATE_IN_CHUNKSIZE, 8 bsl 10). +-define(INFLATE_OUT_CHUNKSIZE, 16 bsl 10). %%------------------------------------------------------------------------ -%% Main data types of the file --type zstream() :: port(). +%% Public data types. +-type zstream() :: term(). +-type zflush() :: 'none' | 'sync' | 'full' | 'finish'. -%% Auxiliary data types of the file --type zlevel() :: 'none' | 'default' | 'best_compression' | 'best_speed' - | 0..9. --type zmethod() :: 'deflated'. +-type zlevel() :: + 'none' | 'default' | 'best_compression' | 'best_speed' | 0..9. +-type zstrategy() :: 'default' | 'filtered' | 'huffman_only' | 'rle'. + +-type zmemlevel() :: 1..9. -type zwindowbits() :: -15..-8 | 8..47. --type zmemlevel() :: 1..9. --type zstrategy() :: 'default' | 'filtered' | 'huffman_only' | 'rle'. + +%% Private data types. + +-type zmethod() :: 'deflated'. + +-record(zlib_opts, { + stream :: zstream(), + method :: term(), + input_chunk_size :: integer(), + output_chunk_size :: integer(), + flush :: integer() + }). %%------------------------------------------------------------------------ -%% open a z_stream +on_load() -> + case erlang:load_nif(atom_to_list(?MODULE), 0) of + ok -> ok + end. + -spec open() -> zstream(). open() -> - open_port({spawn, "zlib_drv"}, [binary]). + open_nif(). +open_nif() -> + erlang:nif_error(undef). -%% close and release z_stream -spec close(Z) -> 'ok' when Z :: zstream(). close(Z) -> - try - true = port_close(Z), - receive %In case the caller is the owner and traps exits - {'EXIT',Z,_} -> ok - after 0 -> ok - end - catch _:_ -> erlang:error(badarg) - end. + close_nif(Z). +close_nif(_Z) -> + erlang:nif_error(undef). -spec deflateInit(Z) -> 'ok' when Z :: zstream(). deflateInit(Z) -> - call(Z, ?DEFLATE_INIT, <<?Z_DEFAULT_COMPRESSION:32>>). + deflateInit(Z, default). -spec deflateInit(Z, Level) -> 'ok' when Z :: zstream(), Level :: zlevel(). deflateInit(Z, Level) -> - call(Z, ?DEFLATE_INIT, <<(arg_level(Level)):32>>). + deflateInit_nif(Z, arg_level(Level)). + +deflateInit_nif(_Z, _Level) -> + erlang:nif_error(undef). --spec deflateInit(Z, Level, Method, - WindowBits, MemLevel, Strategy) -> 'ok' when +-spec deflateInit(Z, Level, Method, WindowBits, MemLevel, Strategy) -> 'ok' when Z :: zstream(), Level :: zlevel(), Method :: zmethod(), @@ -173,31 +143,49 @@ deflateInit(Z, Level) -> MemLevel :: zmemlevel(), Strategy :: zstrategy(). deflateInit(Z, Level, Method, WindowBits, MemLevel, Strategy) -> - call(Z, ?DEFLATE_INIT2, <<(arg_level(Level)):32, - (arg_method(Method)):32, - (arg_bitsz(WindowBits)):32, - (arg_mem(MemLevel)):32, - (arg_strategy(Strategy)):32>>). + deflateInit_nif(Z, + arg_level(Level), + arg_method(Method), + arg_bitsz(WindowBits), + arg_mem(MemLevel), + arg_strategy(Strategy)). +deflateInit_nif(_Z, _Level, _Method, _WindowBits, _MemLevel, _Strategy) -> + erlang:nif_error(undef). -spec deflateSetDictionary(Z, Dictionary) -> Adler32 when Z :: zstream(), Dictionary :: iodata(), Adler32 :: integer(). deflateSetDictionary(Z, Dictionary) -> - call(Z, ?DEFLATE_SETDICT, Dictionary). + deflateSetDictionary_nif(Z, Dictionary). +deflateSetDictionary_nif(_Z, _Dictionary) -> + erlang:nif_error(undef). -spec deflateReset(Z) -> 'ok' when Z :: zstream(). deflateReset(Z) -> - call(Z, ?DEFLATE_RESET, []). + deflateReset_nif(Z). +deflateReset_nif(_Z) -> + erlang:nif_error(undef). -spec deflateParams(Z, Level, Strategy) -> ok when Z :: zstream(), Level :: zlevel(), Strategy :: zstrategy(). -deflateParams(Z, Level, Strategy) -> - call(Z, ?DEFLATE_PARAMS, <<(arg_level(Level)):32, - (arg_strategy(Strategy)):32>>). +deflateParams(Z, Level0, Strategy0) -> + Level = arg_level(Level0), + Strategy = arg_strategy(Strategy0), + case deflateParams_nif(Z, Level, Strategy) of + buf_error -> + %% We had data left in the pipe; flush everything and stash it away + %% for the next deflate call before trying again. + Output = deflate(Z, <<>>, full), + save_progress(Z, deflate, Output), + deflateParams_nif(Z, Level, Strategy); + Any -> Any + end. +deflateParams_nif(_Z, _Level, _Strategy) -> + erlang:nif_error(undef). -spec deflate(Z, Data) -> Compressed when Z :: zstream(), @@ -209,170 +197,234 @@ deflate(Z, Data) -> -spec deflate(Z, Data, Flush) -> Compressed when Z :: zstream(), Data :: iodata(), - Flush :: none | sync | full | finish, + Flush :: zflush(), Compressed :: iolist(). deflate(Z, Data, Flush) -> - try port_command(Z, Data) of - true -> - _ = call(Z, ?DEFLATE, <<(arg_flush(Flush)):32>>), - collect(Z) - catch - error:_Err -> - flush(Z), - erlang:error(badarg) - end. + Progress = restore_progress(Z, deflate), + enqueue_input(Z, Data), + append_iolist(Progress, dequeue_all_chunks(Z, deflate_opts(Flush))). + +deflate_opts(Flush) -> + #zlib_opts{ + method = fun deflate_nif/4, + input_chunk_size = ?DEFLATE_IN_CHUNKSIZE, + output_chunk_size = ?DEFLATE_OUT_CHUNKSIZE, + flush = arg_flush(Flush) + }. + +deflate_nif(_Z, _InputChSize, _OutputChSize, _Flush) -> + erlang:nif_error(undef). -spec deflateEnd(Z) -> 'ok' when Z :: zstream(). deflateEnd(Z) -> - call(Z, ?DEFLATE_END, []). + deflateEnd_nif(Z). +deflateEnd_nif(_Z) -> + erlang:nif_error(undef). -spec inflateInit(Z) -> 'ok' when Z :: zstream(). inflateInit(Z) -> - call(Z, ?INFLATE_INIT, []). + inflateInit_nif(Z). +inflateInit_nif(_Z) -> + erlang:nif_error(undef). -spec inflateInit(Z, WindowBits) -> 'ok' when Z :: zstream(), WindowBits :: zwindowbits(). -inflateInit(Z, WindowBits) -> - call(Z, ?INFLATE_INIT2, <<(arg_bitsz(WindowBits)):32>>). +inflateInit(Z, WindowBits) -> + inflateInit_nif(Z, WindowBits). +inflateInit_nif(_Z, _WindowBits) -> + erlang:nif_error(undef). -spec inflateSetDictionary(Z, Dictionary) -> 'ok' when Z :: zstream(), Dictionary :: iodata(). -inflateSetDictionary(Z, Dictionary) -> - call(Z, ?INFLATE_SETDICT, Dictionary). +inflateSetDictionary(Z, Dictionary) -> + inflateSetDictionary_nif(Z, Dictionary). +inflateSetDictionary_nif(_Z, _Dictionary) -> + erlang:nif_error(undef). -spec inflateGetDictionary(Z) -> Dictionary when Z :: zstream(), - Dictionary :: iolist(). + Dictionary :: binary(). inflateGetDictionary(Z) -> - _ = call(Z, ?INFLATE_GETDICT, []), - collect(Z). - --spec inflateSync(zstream()) -> 'ok'. -inflateSync(Z) -> - call(Z, ?INFLATE_SYNC, []). + case inflateGetDictionary_nif(Z) of + Dictionary when is_binary(Dictionary) -> + Dictionary; + not_supported -> + erlang:error(enotsup) + end. +inflateGetDictionary_nif(_Z) -> + erlang:nif_error(undef). -spec inflateReset(Z) -> 'ok' when Z :: zstream(). -inflateReset(Z) -> - call(Z, ?INFLATE_RESET, []). +inflateReset(Z) -> + inflateReset_nif(Z). +inflateReset_nif(_Z) -> + erlang:nif_error(undef). -spec inflate(Z, Data) -> Decompressed when Z :: zstream(), Data :: iodata(), Decompressed :: iolist(). inflate(Z, Data) -> - try port_command(Z, Data) of - true -> - _ = call(Z, ?INFLATE, <<?Z_NO_FLUSH:32>>), - collect(Z) - catch - error:_Err -> - flush(Z), - erlang:error(badarg) + inflate(Z, Data, []). + +-spec inflate(Z, Data, Options) -> Decompressed when + Z :: zstream(), + Data :: iodata(), + Options :: list({exception_on_need_dict, boolean()}), + Decompressed :: iolist() | + {need_dictionary, + Adler32 :: integer(), + Output :: iolist()}. +inflate(Z, Data, Options) -> + enqueue_input(Z, Data), + Result = dequeue_all_chunks(Z, inflate_opts()), + case proplist_get_value(Options, exception_on_need_dict, true) of + true -> exception_on_need_dict(Z, Result); + false -> Result end. +inflate_nif(_Z, _InputChSize, _OutputChSize, _Flush) -> + erlang:nif_error(undef). + +inflate_opts() -> + #zlib_opts{ + method = fun inflate_nif/4, + input_chunk_size = ?INFLATE_IN_CHUNKSIZE, + output_chunk_size = ?INFLATE_OUT_CHUNKSIZE, + flush = arg_flush(none) + }. + -spec inflateChunk(Z, Data) -> Decompressed | {more, Decompressed} when Z :: zstream(), Data :: iodata(), Decompressed :: iolist(). inflateChunk(Z, Data) -> - try port_command(Z, Data) of - true -> - inflateChunk(Z) - catch - error:_Err -> - flush(Z), - erlang:error(badarg) - end. + enqueue_input(Z, Data), + inflateChunk(Z). -spec inflateChunk(Z) -> Decompressed | {more, Decompressed} when Z :: zstream(), Decompressed :: iolist(). inflateChunk(Z) -> - Status = call(Z, ?INFLATE_CHUNK, []), - Data = receive - {Z, {data, Bin}} -> - Bin - after 0 -> - [] - end, - - case Status of - Good when (Good == ok) orelse (Good == stream_end) -> - Data; - inflate_has_more -> - {more, Data} - end. + Opts0 = inflate_opts(), + Opts = Opts0#zlib_opts { output_chunk_size = getBufSize(Z) }, + + Result0 = dequeue_next_chunk(Z, Opts), + Result1 = exception_on_need_dict(Z, Result0), + yield_inflateChunk(Z, Result1). + +yield_inflateChunk(_Z, {continue, Output}) -> + {more, lists:flatten(Output)}; +yield_inflateChunk(_Z, {finished, Output}) -> + lists:flatten(Output). + +exception_on_need_dict(Z, {need_dictionary, Adler, Output}) -> + Progress = restore_progress(Z, inflate), + save_progress(Z, inflate, append_iolist(Progress, Output)), + erlang:error({need_dictionary, Adler}); +exception_on_need_dict(Z, {Mark, Output}) -> + Progress = restore_progress(Z, inflate), + {Mark, append_iolist(Progress, Output)}; +exception_on_need_dict(Z, Output) when is_list(Output); is_binary(Output) -> + Progress = restore_progress(Z, inflate), + append_iolist(Progress, Output). + +-spec safeInflate(Z, Data) -> Result when + Z :: zstream(), + Data :: iodata(), + Result :: {continue, Output :: iolist()} | + {finished, Output :: iolist()} | + {need_dictionary, + Adler32 :: integer(), + Output :: iolist()}. +safeInflate(Z, Data) -> + enqueue_input(Z, Data), + dequeue_next_chunk(Z, inflate_opts()). -spec inflateEnd(Z) -> 'ok' when Z :: zstream(). inflateEnd(Z) -> - call(Z, ?INFLATE_END, []). + inflateEnd_nif(Z). +inflateEnd_nif(_Z) -> + erlang:nif_error(undef). -spec setBufSize(Z, Size) -> 'ok' when Z :: zstream(), Size :: non_neg_integer(). -setBufSize(Z, Size) -> - call(Z, ?SET_BUFSZ, <<Size:32>>). +setBufSize(Z, Size) when is_integer(Size), Size > 16, Size < (1 bsl 24) -> + setBufSize_nif(Z, Size); +setBufSize(_Z, _Size) -> + erlang:error(badarg). +setBufSize_nif(_Z, _Size) -> + erlang:nif_error(undef). --spec getBufSize(Z) -> Size when - Z :: zstream(), - Size :: non_neg_integer(). +-spec getBufSize(Z) -> non_neg_integer() when + Z :: zstream(). getBufSize(Z) -> - call(Z, ?GET_BUFSZ, []). + getBufSize_nif(Z). +getBufSize_nif(_Z) -> + erlang:nif_error(undef). -spec crc32(Z) -> CRC when Z :: zstream(), CRC :: integer(). crc32(Z) -> - call(Z, ?CRC32_0, []). + crc32_nif(Z). +crc32_nif(_Z) -> + erlang:nif_error(undef). -spec crc32(Z, Data) -> CRC when Z :: zstream(), Data :: iodata(), CRC :: integer(). -crc32(Z, Data) -> - call(Z, ?CRC32_1, Data). +crc32(Z, Data) when is_reference(Z) -> + erlang:crc32(Data); +crc32(_Z, _Data) -> + erlang:error(badarg). -spec crc32(Z, PrevCRC, Data) -> CRC when Z :: zstream(), PrevCRC :: integer(), Data :: iodata(), CRC :: integer(). -crc32(Z, CRC, Data) -> - call(Z, ?CRC32_2, [<<CRC:32>>, Data]). +crc32(Z, CRC, Data) when is_reference(Z) -> + erlang:crc32(CRC, Data); +crc32(_Z, _CRC, _Data) -> + erlang:error(badarg). + +-spec crc32_combine(Z, CRC1, CRC2, Size2) -> CRC when + Z :: zstream(), + CRC :: integer(), + CRC1 :: integer(), + CRC2 :: integer(), + Size2 :: integer(). +crc32_combine(Z, CRC1, CRC2, Size2) when is_reference(Z) -> + erlang:crc32_combine(CRC1, CRC2, Size2); +crc32_combine(_Z, _CRC1, _CRC2, _Size2) -> + erlang:error(badarg). -spec adler32(Z, Data) -> CheckSum when Z :: zstream(), Data :: iodata(), CheckSum :: integer(). -adler32(Z, Data) -> - call(Z, ?ADLER32_1, Data). +adler32(Z, Data) when is_reference(Z) -> + erlang:adler32(Data); +adler32(_Z, _Data) -> + erlang:error(badarg). -spec adler32(Z, PrevAdler, Data) -> CheckSum when Z :: zstream(), PrevAdler :: integer(), Data :: iodata(), CheckSum :: integer(). -adler32(Z, Adler, Data) when is_integer(Adler) -> - call(Z, ?ADLER32_2, [<<Adler:32>>, Data]); -adler32(_Z, _Adler, _Data) -> - erlang:error(badarg). - --spec crc32_combine(Z, CRC1, CRC2, Size2) -> CRC when - Z :: zstream(), - CRC :: integer(), - CRC1 :: integer(), - CRC2 :: integer(), - Size2 :: integer(). -crc32_combine(Z, CRC1, CRC2, Len2) - when is_integer(CRC1), is_integer(CRC2), is_integer(Len2) -> - call(Z, ?CRC32_COMBINE, <<CRC1:32, CRC2:32, Len2:32>>); -crc32_combine(_Z, _CRC1, _CRC2, _Len2) -> +adler32(Z, Adler, Data) when is_reference(Z) -> + erlang:adler32(Adler, Data); +adler32(_Z, _Adler, _Data) -> erlang:error(badarg). -spec adler32_combine(Z, Adler1, Adler2, Size2) -> Adler when @@ -381,16 +433,11 @@ crc32_combine(_Z, _CRC1, _CRC2, _Len2) -> Adler1 :: integer(), Adler2 :: integer(), Size2 :: integer(). -adler32_combine(Z, Adler1, Adler2, Len2) - when is_integer(Adler1), is_integer(Adler2), is_integer(Len2) -> - call(Z, ?ADLER32_COMBINE, <<Adler1:32, Adler2:32, Len2:32>>); -adler32_combine(_Z, _Adler1, _Adler2, _Len2) -> +adler32_combine(Z, Adler1, Adler2, Size2) when is_reference(Z) -> + erlang:adler32_combine(Adler1, Adler2, Size2); +adler32_combine(_Z, _Adler1, _Adler2, _Size2) -> erlang:error(badarg). --spec getQSize(zstream()) -> non_neg_integer(). -getQSize(Z) -> - call(Z, ?GET_QSIZE, []). - %% compress/uncompress zlib with header -spec compress(Data) -> Compressed when Data :: iodata(), @@ -398,13 +445,13 @@ getQSize(Z) -> compress(Data) -> Z = open(), Bs = try - deflateInit(Z, default), - B = deflate(Z, Data, finish), - deflateEnd(Z), - B - after - close(Z) - end, + deflateInit(Z, default), + B = deflate(Z, Data, finish), + deflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs). -spec uncompress(Data) -> Decompressed when @@ -416,14 +463,14 @@ uncompress(Data) -> if Size >= 8 -> Z = open(), - Bs = try - inflateInit(Z), - B = inflate(Z, Data), - inflateEnd(Z), - B - after - close(Z) - end, + Bs = try + inflateInit(Z), + B = inflate(Z, Data), + inflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs); true -> erlang:error(data_error) @@ -440,13 +487,13 @@ uncompress(Data) -> zip(Data) -> Z = open(), Bs = try - deflateInit(Z, default, deflated, -?MAX_WBITS, 8, default), - B = deflate(Z, Data, finish), - deflateEnd(Z), - B - after - close(Z) - end, + deflateInit(Z, default, deflated, -?MAX_WBITS, 8, default), + B = deflate(Z, Data, finish), + deflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs). -spec unzip(Data) -> Decompressed when @@ -455,28 +502,28 @@ zip(Data) -> unzip(Data) -> Z = open(), Bs = try - inflateInit(Z, -?MAX_WBITS), - B = inflate(Z, Data), - inflateEnd(Z), - B - after - close(Z) - end, + inflateInit(Z, -?MAX_WBITS), + B = inflate(Z, Data), + inflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs). - + -spec gzip(Data) -> Compressed when Data :: iodata(), Compressed :: binary(). gzip(Data) -> Z = open(), Bs = try - deflateInit(Z, default, deflated, 16+?MAX_WBITS, 8, default), - B = deflate(Z, Data, finish), - deflateEnd(Z), - B - after - close(Z) - end, + deflateInit(Z, default, deflated, 16+?MAX_WBITS, 8, default), + B = deflate(Z, Data, finish), + deflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs). -spec gunzip(Data) -> Decompressed when @@ -485,42 +532,108 @@ gzip(Data) -> gunzip(Data) -> Z = open(), Bs = try - inflateInit(Z, 16+?MAX_WBITS), - B = inflate(Z, Data), - inflateEnd(Z), - B - after - close(Z) - end, + inflateInit(Z, 16+?MAX_WBITS), + B = inflate(Z, Data), + inflateEnd(Z), + B + after + close(Z) + end, iolist_to_binary(Bs). --spec collect(zstream()) -> iolist(). -collect(Z) -> - collect(Z, []). - --spec collect(zstream(), iolist()) -> iolist(). -collect(Z, Acc) -> - receive - {Z, {data, Bin}} -> - collect(Z, [Bin|Acc]) - after 0 -> - reverse(Acc) +-spec dequeue_all_chunks(Z, Opts) -> Result when + Z :: zstream(), + Opts :: #zlib_opts{}, + Result :: {need_dictionary, integer(), iolist()} | + iolist(). +dequeue_all_chunks(Z, Opts) -> + dequeue_all_chunks_1(Z, Opts, []). +dequeue_all_chunks_1(Z, Opts, Output) -> + case dequeue_next_chunk(Z, Opts) of + {need_dictionary, _, _} = NeedDict -> + NeedDict; + {continue, Chunk} -> + dequeue_all_chunks_1(Z, Opts, append_iolist(Output, Chunk)); + {finished, Chunk} -> + append_iolist(Output, Chunk) end. --spec flush(zstream()) -> 'ok'. -flush(Z) -> - receive - {Z, {data,_}} -> - flush(Z) - after 0 -> - ok +-spec dequeue_next_chunk(Z, Opts) -> Result when + Z :: zstream(), + Opts :: #zlib_opts{}, + Result :: {need_dictionary, integer(), iolist()} | + {continue, iolist()} | + {finished, iolist()}. +dequeue_next_chunk(Z, Opts) -> + Method = Opts#zlib_opts.method, + IChSz = Opts#zlib_opts.input_chunk_size, + OChSz = Opts#zlib_opts.output_chunk_size, + Flush = Opts#zlib_opts.flush, + Method(Z, IChSz, OChSz, Flush). + +-spec append_iolist(IO, D) -> iolist() when + IO :: iodata(), + D :: iodata(). +append_iolist([], D) when is_list(D) -> D; +append_iolist([], D) -> [D]; +append_iolist(IO, []) -> IO; +append_iolist(IO, [D]) -> [IO, D]; +append_iolist(IO, D) -> [IO, D]. + +%% inflate/2 and friends are documented as throwing an error on Z_NEED_DICT +%% rather than simply returning something to that effect, and deflateParams/3 +%% may flush behind the scenes. This requires us to stow away our current +%% progress in the handle and resume from that point on our next call. +%% +%% Generally speaking this is either a refc binary or nothing at all, so it's +%% pretty cheap. + +-spec save_progress(Z, Kind, Output) -> ok when + Z :: zstream(), + Kind :: inflate | deflate, + Output :: iolist(). +save_progress(Z, Kind, Output) -> + ok = setStash_nif(Z, {Kind, Output}). + +-spec restore_progress(Z, Kind) -> iolist() when + Z :: zstream(), + Kind :: inflate | deflate. +restore_progress(Z, Kind) -> + case getStash_nif(Z) of + {ok, {Kind, Output}} -> + ok = clearStash_nif(Z), + Output; + empty -> + [] end. - -arg_flush(none) -> ?Z_NO_FLUSH; + +-spec clearStash_nif(Z) -> ok when + Z :: zstream(). +clearStash_nif(_Z) -> + erlang:nif_error(undef). + +-spec setStash_nif(Z, Term) -> ok when + Z :: zstream(), + Term :: term(). +setStash_nif(_Z, _Term) -> + erlang:nif_error(undef). + +-spec getStash_nif(Z) -> {ok, term()} | empty when + Z :: zstream(). +getStash_nif(_Z) -> + erlang:nif_error(undef). + +%% The 'proplists' module isn't preloaded so we can't rely on its existence. +proplist_get_value([], _Name, DefVal) -> DefVal; +proplist_get_value([{Name, Value} | _Opts], Name, _DefVal) -> Value; +proplist_get_value([_Head | Opts], Name, DefVal) -> + proplist_get_value(Opts, Name, DefVal). + +arg_flush(none) -> ?Z_NO_FLUSH; %% ?Z_PARTIAL_FLUSH is deprecated in zlib -- deliberately not included. -arg_flush(sync) -> ?Z_SYNC_FLUSH; -arg_flush(full) -> ?Z_FULL_FLUSH; -arg_flush(finish) -> ?Z_FINISH; +arg_flush(sync) -> ?Z_SYNC_FLUSH; +arg_flush(full) -> ?Z_FULL_FLUSH; +arg_flush(finish) -> ?Z_FINISH; arg_flush(_) -> erlang:error(badarg). arg_level(none) -> ?Z_NO_COMPRESSION; @@ -529,7 +642,7 @@ arg_level(best_compression) -> ?Z_BEST_COMPRESSION; arg_level(default) -> ?Z_DEFAULT_COMPRESSION; arg_level(Level) when is_integer(Level), Level >= 0, Level =< 9 -> Level; arg_level(_) -> erlang:error(badarg). - + arg_strategy(filtered) -> ?Z_FILTERED; arg_strategy(huffman_only) -> ?Z_HUFFMAN_ONLY; arg_strategy(rle) -> ?Z_RLE; @@ -541,8 +654,8 @@ arg_method(_) -> erlang:error(badarg). -spec arg_bitsz(zwindowbits()) -> zwindowbits(). arg_bitsz(Bits) when is_integer(Bits) andalso - ((8 =< Bits andalso Bits < 48) orelse - (-15 =< Bits andalso Bits =< -8)) -> + ((8 =< Bits andalso Bits < 48) orelse + (-15 =< Bits andalso Bits =< -8)) -> Bits; arg_bitsz(_) -> erlang:error(badarg). @@ -550,27 +663,17 @@ arg_bitsz(_) -> erlang:error(badarg). arg_mem(Level) when is_integer(Level), 1 =< Level, Level =< 9 -> Level; arg_mem(_) -> erlang:error(badarg). -call(Z, Cmd, Arg) -> - try port_control(Z, Cmd, Arg) of - [0|Res] -> list_to_atom(Res); - [1|Res] -> - flush(Z), - erlang:error(list_to_atom(Res)); - [2,A,B,C,D] -> - (A bsl 24)+(B bsl 16)+(C bsl 8)+D; - [3,A,B,C,D] -> - erlang:error({need_dictionary,(A bsl 24)+(B bsl 16)+(C bsl 8)+D}); - [4, _, _, _, _] -> - inflate_has_more - catch - error:badarg -> %% Rethrow loses port_control from stacktrace. - erlang:error(badarg) +-spec enqueue_input(Z, IOData) -> ok when + Z :: zstream(), + IOData :: iodata(). +enqueue_input(Z, IOData) -> + enqueue_input_1(Z, erlang:iolist_to_iovec(IOData)). + +enqueue_input_1(Z, IOVec) -> + case enqueue_nif(Z, IOVec) of + {continue, Remainder} -> enqueue_input_1(Z, Remainder); + ok -> ok end. -reverse(X) -> - reverse(X, []). - -reverse([H|T], Y) -> - reverse(T, [H|Y]); -reverse([], X) -> - X. +enqueue_nif(_Z, _IOVec) -> + erlang:nif_error(undef).
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