circuitpython/shared-module/zlib/__init__.c

101 lines
3.4 KiB
C

/*
* 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"
#define UZLIB_CONF_PARANOID_CHECKS (1)
#include "lib/uzlib/tinf.h"
#if 0 // print debugging info
#define DEBUG_printf DEBUG_printf
#else // don't print debugging info
#define DEBUG_printf(...) (void)0
#endif
mp_obj_t common_hal_zlib_decompress(mp_obj_t data, bool is_zlib) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
TINF_DATA *decomp = m_new_obj(TINF_DATA);
memset(decomp, 0, sizeof(*decomp));
DEBUG_printf("sizeof(TINF_DATA)=" UINT_FMT "\n", sizeof(*decomp));
uzlib_uncompress_init(decomp, NULL, 0);
mp_uint_t dest_buf_size = (bufinfo.len + 15) & ~15;
byte *dest_buf = m_new(byte, dest_buf_size);
decomp->dest = dest_buf;
decomp->dest_limit = dest_buf + dest_buf_size;
DEBUG_printf("zlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);
decomp->source = bufinfo.buf;
decomp->source_limit = (unsigned char *)bufinfo.buf + bufinfo.len;
int st;
if (is_zlib) {
st = uzlib_zlib_parse_header(decomp);
if (st < 0) {
goto error;
}
}
while (1) {
st = uzlib_uncompress_chksum(decomp);
if (st < 0) {
goto error;
}
if (st == TINF_DONE) {
break;
}
size_t offset = decomp->dest - dest_buf;
dest_buf = m_renew(byte, dest_buf, dest_buf_size, dest_buf_size + 256);
dest_buf_size += 256;
decomp->dest = dest_buf + offset;
decomp->dest_limit = dest_buf + offset + 256;
}
mp_uint_t final_sz = decomp->dest - dest_buf;
DEBUG_printf("zlib: Resizing from " UINT_FMT " to final size: " UINT_FMT " bytes\n", dest_buf_size, final_sz);
dest_buf = (byte *)m_renew(byte, dest_buf, dest_buf_size, final_sz);
mp_obj_t res = mp_obj_new_bytearray_by_ref(final_sz, dest_buf);
m_del_obj(TINF_DATA, decomp);
return res;
error:
mp_raise_type_arg(&mp_type_ValueError, MP_OBJ_NEW_SMALL_INT(st));
}