![Paul Sokolovsky](/assets/img/avatar_default.png)
Its addition was due to an early exploration on how to add CPython-like stream interface. It's clear that it's not needed and just takes up bytes in all ports.
227 lines
7.1 KiB
C
227 lines
7.1 KiB
C
/*
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* This file is part of the Micro Python 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) 2014-2016 Paul Sokolovsky
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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 <stdio.h>
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#include <string.h>
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#include "py/nlr.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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#if MICROPY_PY_UZLIB
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#include "uzlib/tinf.h"
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#if 0 // print debugging info
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#define DEBUG_printf DEBUG_printf
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#else // don't print debugging info
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#define DEBUG_printf(...) (void)0
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#endif
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typedef struct _mp_obj_decompio_t {
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mp_obj_base_t base;
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mp_obj_t src_stream;
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TINF_DATA decomp;
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bool eof;
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} mp_obj_decompio_t;
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STATIC unsigned char read_src_stream(TINF_DATA *data) {
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byte *p = (void*)data;
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p -= offsetof(mp_obj_decompio_t, decomp);
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mp_obj_decompio_t *self = (mp_obj_decompio_t*)p;
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const mp_stream_p_t *stream = mp_get_stream_raise(self->src_stream, MP_STREAM_OP_READ);
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int err;
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byte c;
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mp_uint_t out_sz = stream->read(self->src_stream, &c, 1, &err);
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if (out_sz == MP_STREAM_ERROR) {
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mp_raise_OSError(err);
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}
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if (out_sz == 0) {
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nlr_raise(mp_obj_new_exception(&mp_type_EOFError));
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}
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return c;
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}
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STATIC mp_obj_t 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_obj_decompio_t *o = m_new_obj(mp_obj_decompio_t);
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o->base.type = type;
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memset(&o->decomp, 0, sizeof(o->decomp));
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o->decomp.readSource = read_src_stream;
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o->src_stream = args[0];
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o->eof = false;
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mp_int_t dict_opt = 0;
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int dict_sz;
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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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if (dict_opt >= 16) {
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int st = uzlib_gzip_parse_header(&o->decomp);
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if (st != TINF_OK) {
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goto header_error;
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}
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dict_sz = 1 << (dict_opt - 16);
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} else if (dict_opt >= 0) {
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dict_opt = uzlib_zlib_parse_header(&o->decomp);
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if (dict_opt < 0) {
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header_error:
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "compression header"));
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}
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dict_sz = 1 << dict_opt;
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} else {
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dict_sz = 1 << -dict_opt;
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}
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uzlib_uncompress_init(&o->decomp, m_new(byte, dict_sz), dict_sz);
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return MP_OBJ_FROM_PTR(o);
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}
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STATIC mp_uint_t decompio_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
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mp_obj_decompio_t *o = MP_OBJ_TO_PTR(o_in);
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if (o->eof) {
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return 0;
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}
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o->decomp.dest = buf;
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o->decomp.destSize = size;
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int st = uzlib_uncompress_chksum(&o->decomp);
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if (st == TINF_DONE) {
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o->eof = true;
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}
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if (st < 0) {
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*errcode = MP_EINVAL;
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return MP_STREAM_ERROR;
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}
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return o->decomp.dest - (byte*)buf;
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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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.read = decompio_read,
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};
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STATIC const mp_obj_type_t decompio_type = {
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{ &mp_type_type },
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.name = MP_QSTR_DecompIO,
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.make_new = decompio_make_new,
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.protocol = &decompio_stream_p,
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.locals_dict = (void*)&decompio_locals_dict,
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};
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STATIC mp_obj_t mod_uzlib_decompress(size_t n_args, const mp_obj_t *args) {
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(void)n_args;
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mp_obj_t data = args[0];
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
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TINF_DATA *decomp = m_new_obj(TINF_DATA);
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memset(decomp, 0, sizeof(*decomp));
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DEBUG_printf("sizeof(TINF_DATA)=" UINT_FMT "\n", sizeof(*decomp));
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uzlib_uncompress_init(decomp, NULL, 0);
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mp_uint_t dest_buf_size = (bufinfo.len + 15) & ~15;
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byte *dest_buf = m_new(byte, dest_buf_size);
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decomp->dest = dest_buf;
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decomp->destSize = dest_buf_size;
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DEBUG_printf("uzlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);
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decomp->source = bufinfo.buf;
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int st;
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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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if (is_zlib) {
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st = uzlib_zlib_parse_header(decomp);
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if (st < 0) {
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goto error;
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}
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}
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while (1) {
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st = uzlib_uncompress_chksum(decomp);
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if (st < 0) {
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goto error;
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}
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if (st == TINF_DONE) {
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break;
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}
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size_t offset = decomp->dest - dest_buf;
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dest_buf = m_renew(byte, dest_buf, dest_buf_size, dest_buf_size + 256);
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dest_buf_size += 256;
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decomp->dest = dest_buf + offset;
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decomp->destSize = 256;
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}
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mp_uint_t final_sz = decomp->dest - dest_buf;
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DEBUG_printf("uzlib: Resizing from " UINT_FMT " to final size: " UINT_FMT " bytes\n", dest_buf_size, final_sz);
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dest_buf = (byte*)m_renew(byte, dest_buf, dest_buf_size, final_sz);
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mp_obj_t res = mp_obj_new_bytearray_by_ref(final_sz, dest_buf);
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m_del_obj(TINF_DATA, decomp);
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return res;
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error:
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_ValueError, MP_OBJ_NEW_SMALL_INT(st)));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_uzlib_decompress_obj, 1, 3, mod_uzlib_decompress);
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STATIC const mp_rom_map_elem_t mp_module_uzlib_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uzlib) },
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{ MP_ROM_QSTR(MP_QSTR_decompress), MP_ROM_PTR(&mod_uzlib_decompress_obj) },
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{ MP_ROM_QSTR(MP_QSTR_DecompIO), MP_ROM_PTR(&decompio_type) },
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_uzlib_globals, mp_module_uzlib_globals_table);
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const mp_obj_module_t mp_module_uzlib = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mp_module_uzlib_globals,
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};
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// Source files #include'd here to make sure they're compiled in
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// only if module is enabled by config setting.
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#include "uzlib/tinflate.c"
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#include "uzlib/tinfzlib.c"
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#include "uzlib/tinfgzip.c"
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#include "uzlib/adler32.c"
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#include "uzlib/crc32.c"
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#endif // MICROPY_PY_UZLIB
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