96 lines
3.6 KiB
C
96 lines
3.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Mark Komus
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <assert.h>
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#include <string.h>
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mperrno.h"
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#include "py/builtin.h"
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#include "py/objtuple.h"
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#include "py/binary.h"
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#include "py/parsenum.h"
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#include "shared-bindings/zlib/__init__.h"
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#include "supervisor/shared/translate/translate.h"
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//| """zlib decompression functionality
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//|
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//| The `zlib` module allows limited functionality similar to the CPython zlib library.
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//| This module allows to decompress binary data compressed with DEFLATE algorithm
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//| (commonly used in zlib library and gzip archiver). Compression is not yet implemented."""
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//|
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//| def decompress(data: bytes, wbits: Optional[int] = 0, bufsize: Optional[int] = 0) -> bytes:
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//| """Return decompressed *data* as bytes. *wbits* is DEFLATE dictionary window
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//| size used during compression (8-15, the dictionary size is power of 2 of
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//| that value). Additionally, if value is positive, *data* is assumed to be
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//| zlib stream (with zlib header). Otherwise, if it's negative, it's assumed
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//| to be raw DEFLATE stream.
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//|
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//| The wbits parameter controls the size of the history buffer (or “window size”), and what header
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//| and trailer format is expected.
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//|
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//| Common wbits values:
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//|
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//| * To decompress deflate format, use wbits = -15
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//| * To decompress zlib format, use wbits = 15
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//| * To decompress gzip format, use wbits = 31
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//|
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//| :param bytes data: data to be decompressed
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//| :param int wbits: DEFLATE dictionary window size used during compression. See above.
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//| :param int bufsize: ignored for compatibility with CPython only
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//| """
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//| ...
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//|
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STATIC mp_obj_t zlib_decompress(size_t n_args, const mp_obj_t *args) {
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bool is_zlib = true;
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if (n_args > 1 && MP_OBJ_SMALL_INT_VALUE(args[1]) < 0) {
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is_zlib = false;
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}
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return common_hal_zlib_decompress(args[0], is_zlib);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(zlib_decompress_obj, 1, 3, zlib_decompress);
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STATIC const mp_rom_map_elem_t zlib_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_zlib) },
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{ MP_ROM_QSTR(MP_QSTR_decompress), MP_ROM_PTR(&zlib_decompress_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(zlib_globals, zlib_globals_table);
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const mp_obj_module_t zlib_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t *)&zlib_globals,
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};
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MP_REGISTER_MODULE(MP_QSTR_zlib, zlib_module);
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