133 lines
5.1 KiB
C
133 lines
5.1 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 <string.h>
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#include "py/obj.h"
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#include "py/stream.h"
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#include "py/runtime.h"
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#include "shared-bindings/zlib/DecompIO.h"
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#include "shared-module/zlib/DecompIO.h"
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//| class DecompIO:
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//| """A stream wrapper which allows transparent decompression of compressed data in
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//| another stream. This allows to process compressed streams with data larger
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//| than available heap size.
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//|
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//| *wbits* is DEFLATE dictionary window size used during compression (8-15, the
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//| dictionary size is power of 2 of that value). Additionally, if value is positive,
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//| *data* is assumed to be zlib stream (with zlib header). Otherwise, if it's
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//| negative, it's assumed to be raw DEFLATE stream. *wbits* values 24..31 (16 + 8..15)
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//| mean that input stream has gzip header."""
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//|
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//| def __init__(self, stream: IO[AnyStr], wbits: Optional[int] = 0) -> None:
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//| """Creates a DecompIO object to decompress stream data.
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//| """
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//| ...
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//|
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// These are standard stream methods. Code is in py/stream.c.
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//
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//| def read(self, nbytes: Optional[int] = None) -> Optional[bytes]:
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//| """Read characters. If ``nbytes`` is specified then read at most that many
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//| bytes. Otherwise, read everything that arrives until the connection
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//| times out. Providing the number of bytes expected is highly recommended
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//| because it will be faster.
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//|
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//| :return: Data read
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//| :rtype: bytes or None"""
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//| ...
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//|
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//| def readinto(self, buf: WriteableBuffer, nbytes: Optional[int] = None) -> Optional[bytes]:
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//| """Read bytes into the ``buf``. If ``nbytes`` is specified then read at most
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//| that many bytes. Otherwise, read at most ``len(buf)`` bytes.
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//|
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//| :return: number of bytes read and stored into ``buf``
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//| :rtype: bytes or None"""
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//| ...
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//|
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//| def readline(self, nbytes: Optional[int] = None) -> Optional[bytes]:
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//| """Read and return one line from the stream. The line terminator is always b'\n'.
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//| If ``nbytes`` is specified then read at most that many bytes.
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//|
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//| :return: Data read
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//| :rtype: bytes or None"""
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//| ...
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//|
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STATIC mp_obj_t zlib_decompio_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 1, 2, false);
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mp_get_stream_raise(args[0], MP_STREAM_OP_READ);
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mp_obj_decompio_t *self = m_new_obj(mp_obj_decompio_t);
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self->base.type = type;
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memset(&self->decomp, 0, sizeof(self->decomp));
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mp_int_t dict_opt = 0;
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if (n_args > 1) {
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dict_opt = mp_obj_get_int(args[1]);
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}
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common_hal_zlib_decompio_construct(self, args[0], dict_opt);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC mp_uint_t zlib_decompio_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
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mp_obj_decompio_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->eof) {
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return 0;
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}
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return common_hal_zlib_decompio_read(self, buf, size, errcode);
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}
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STATIC const mp_rom_map_elem_t decompio_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(decompio_locals_dict, decompio_locals_dict_table);
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STATIC const mp_stream_p_t decompio_stream_p = {
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MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
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.read = zlib_decompio_read,
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.write = NULL,
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.ioctl = NULL,
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.is_text = false,
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};
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const mp_obj_type_t decompio_type = {
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{ &mp_type_type },
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.flags = MP_TYPE_FLAG_EXTENDED,
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.name = MP_QSTR_DecompIO,
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.make_new = zlib_decompio_make_new,
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.locals_dict = (void *)&decompio_locals_dict,
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MP_TYPE_EXTENDED_FIELDS(
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.protocol = &decompio_stream_p,
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),
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};
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