85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
|
|
//
|
|
// SPDX-FileCopyrightText: Copyright (c) 2022 Mark Komus
|
|
//
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
#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, mp_int_t wbits) {
|
|
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 (wbits >= 16) {
|
|
st = uzlib_gzip_parse_header(decomp);
|
|
if (st < 0) {
|
|
goto error;
|
|
}
|
|
} else if (wbits >= 0) {
|
|
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));
|
|
}
|