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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2020 Damien P. George
*
* 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 <string.h>
#include "py/mphal.h"
#include "lib/uzlib/uzlib.h"
#include "gzstream.h"
#include "mboot.h"
#if MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
#define DICT_SIZE (1 << 15)
typedef struct _gz_stream_t {
void *stream_data;
stream_read_t stream_read;
uzlib_uncomp_t decomp;
uint8_t buf[512];
uint8_t dict[DICT_SIZE];
} gz_stream_t;
static gz_stream_t gz_stream SECTION_NOZERO_BSS;
static int gz_stream_read_src(void *data) {
uzlib_uncomp_t *decomp = data;
int n = gz_stream.stream_read(gz_stream.stream_data, gz_stream.buf, sizeof(gz_stream.buf));
if (n < 0) {
// Stream error
return -1;
}
if (n == 0) {
// No data / EOF
return -1;
}
decomp->source = gz_stream.buf + 1;
decomp->source_limit = gz_stream.buf + n;
return gz_stream.buf[0];
}
int gz_stream_init_from_raw_data(const uint8_t *data, size_t len) {
memset(&gz_stream.decomp, 0, sizeof(gz_stream.decomp));
gz_stream.decomp.source = data;
gz_stream.decomp.source_limit = data + len;
uzlib_uncompress_init(&gz_stream.decomp, gz_stream.dict, DICT_SIZE);
return 0;
}
int gz_stream_init_from_stream(void *stream_data, stream_read_t stream_read) {
gz_stream.stream_data = stream_data;
gz_stream.stream_read = stream_read;
memset(&gz_stream.decomp, 0, sizeof(gz_stream.decomp));
gz_stream.decomp.source_read_data = &gz_stream.decomp;
gz_stream.decomp.source_read_cb = gz_stream_read_src;
int header_wbits;
int st = uzlib_parse_zlib_gzip_header(&gz_stream.decomp, &header_wbits);
if (st != UZLIB_HEADER_GZIP) {
return -MBOOT_ERRNO_GUNZIP_FAILED;
}
uzlib_uncompress_init(&gz_stream.decomp, gz_stream.dict, DICT_SIZE);
return 0;
}
int gz_stream_read(size_t len, uint8_t *buf) {
if (gz_stream.decomp.source == NULL && gz_stream.decomp.source_read_cb == NULL) {
// End of stream.
return 0;
}
gz_stream.decomp.dest = buf;
gz_stream.decomp.dest_limit = buf + len;
int st = uzlib_uncompress_chksum(&gz_stream.decomp);
if (st < 0) {
return st;
}
if (st == UZLIB_DONE) {
// Indicate end-of-stream for subsequent calls.
gz_stream.decomp.source = NULL;
gz_stream.decomp.source_read_cb = NULL;
}
return gz_stream.decomp.dest - buf;
}
#endif // MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
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