kopia lustrzana https://github.com/micropython/micropython
112 wiersze
3.5 KiB
C
112 wiersze
3.5 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) 2019-2020 Damien P. George
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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/mphal.h"
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#include "lib/uzlib/uzlib.h"
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#include "gzstream.h"
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#include "mboot.h"
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#if MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
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#define DICT_SIZE (1 << 15)
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typedef struct _gz_stream_t {
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void *stream_data;
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stream_read_t stream_read;
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uzlib_uncomp_t decomp;
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uint8_t buf[512];
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uint8_t dict[DICT_SIZE];
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} gz_stream_t;
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static gz_stream_t gz_stream SECTION_NOZERO_BSS;
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static int gz_stream_read_src(uzlib_uncomp_t *decomp) {
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int n = gz_stream.stream_read(gz_stream.stream_data, gz_stream.buf, sizeof(gz_stream.buf));
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if (n < 0) {
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// Stream error
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return -1;
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}
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if (n == 0) {
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// No data / EOF
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return -1;
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}
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decomp->source = gz_stream.buf + 1;
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decomp->source_limit = gz_stream.buf + n;
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return gz_stream.buf[0];
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}
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int gz_stream_init_from_raw_data(const uint8_t *data, size_t len) {
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memset(&gz_stream.decomp, 0, sizeof(gz_stream.decomp));
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gz_stream.decomp.source = data;
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gz_stream.decomp.source_limit = data + len;
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uzlib_uncompress_init(&gz_stream.decomp, gz_stream.dict, DICT_SIZE);
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return 0;
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}
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int gz_stream_init_from_stream(void *stream_data, stream_read_t stream_read) {
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gz_stream.stream_data = stream_data;
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gz_stream.stream_read = stream_read;
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memset(&gz_stream.decomp, 0, sizeof(gz_stream.decomp));
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gz_stream.decomp.source_read_cb = gz_stream_read_src;
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int header_wbits;
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int st = uzlib_parse_zlib_gzip_header(&gz_stream.decomp, &header_wbits);
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if (st != UZLIB_HEADER_GZIP) {
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return -MBOOT_ERRNO_GUNZIP_FAILED;
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}
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uzlib_uncompress_init(&gz_stream.decomp, gz_stream.dict, DICT_SIZE);
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return 0;
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}
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int gz_stream_read(size_t len, uint8_t *buf) {
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if (gz_stream.decomp.source == NULL && gz_stream.decomp.source_read_cb == NULL) {
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// End of stream.
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return 0;
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}
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gz_stream.decomp.dest = buf;
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gz_stream.decomp.dest_limit = buf + len;
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int st = uzlib_uncompress_chksum(&gz_stream.decomp);
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if (st < 0) {
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return st;
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}
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if (st == UZLIB_DONE) {
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// Indicate end-of-stream for subsequent calls.
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gz_stream.decomp.source = NULL;
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gz_stream.decomp.source_read_cb = NULL;
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}
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return gz_stream.decomp.dest - buf;
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}
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#endif // MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
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