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