106 lines
3.5 KiB
C
106 lines
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) 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 <stdint.h>
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#include <assert.h>
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#include <string.h>
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#include "py/obj.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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#include "py/builtin.h"
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#include "py/objtuple.h"
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#include "py/binary.h"
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#include "py/parsenum.h"
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#include "shared-bindings/zlib/__init__.h"
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#define UZLIB_CONF_PARANOID_CHECKS (1)
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#include "lib/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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mp_obj_t common_hal_zlib_decompress(mp_obj_t data, mp_int_t wbits) {
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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->dest_limit = dest_buf + dest_buf_size;
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DEBUG_printf("zlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);
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decomp->source = bufinfo.buf;
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decomp->source_limit = (unsigned char *)bufinfo.buf + bufinfo.len;
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int st;
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if (wbits >= 16) {
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st = uzlib_gzip_parse_header(decomp);
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if (st < 0) {
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goto error;
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}
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} else if (wbits >= 0) {
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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->dest_limit = dest_buf + offset + 256;
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}
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mp_uint_t final_sz = decomp->dest - dest_buf;
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DEBUG_printf("zlib: 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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mp_raise_type_arg(&mp_type_ValueError, MP_OBJ_NEW_SMALL_INT(st));
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}
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