circuitpython/extmod/moduzlib.c

219 lines
6.6 KiB
C

// Copyright (c) 2014-2016 Paul Sokolovsky
// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
//
// SPDX-License-Identifier: MIT
#include <stdio.h>
#include <string.h>
#include "py/runtime.h"
#include "py/stream.h"
#include "py/mperrno.h"
#include "supervisor/shared/translate/translate.h"
#if MICROPY_PY_UZLIB
#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
typedef struct _mp_obj_decompio_t {
mp_obj_base_t base;
mp_obj_t src_stream;
TINF_DATA decomp;
bool eof;
} mp_obj_decompio_t;
STATIC int read_src_stream(TINF_DATA *data) {
byte *p = (void *)data;
p -= offsetof(mp_obj_decompio_t, decomp);
mp_obj_decompio_t *self = (mp_obj_decompio_t *)p;
const mp_stream_p_t *stream = mp_get_stream_raise(self->src_stream, MP_STREAM_OP_READ);
int err;
byte c;
mp_uint_t out_sz = stream->read(self->src_stream, &c, 1, &err);
if (out_sz == MP_STREAM_ERROR) {
mp_raise_OSError(err);
}
if (out_sz == 0) {
mp_raise_type(&mp_type_EOFError);
}
return c;
}
STATIC mp_obj_t decompio_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 2, false);
mp_get_stream_raise(args[0], MP_STREAM_OP_READ);
mp_obj_decompio_t *o = m_new_obj(mp_obj_decompio_t);
o->base.type = type;
memset(&o->decomp, 0, sizeof(o->decomp));
o->decomp.readSource = read_src_stream;
o->src_stream = args[0];
o->eof = false;
mp_int_t dict_opt = 0;
int dict_sz;
if (n_args > 1) {
dict_opt = mp_obj_get_int(args[1]);
}
if (dict_opt >= 16) {
int st = uzlib_gzip_parse_header(&o->decomp);
if (st != TINF_OK) {
goto header_error;
}
dict_sz = 1 << (dict_opt - 16);
} else if (dict_opt >= 0) {
dict_opt = uzlib_zlib_parse_header(&o->decomp);
if (dict_opt < 0) {
header_error:
mp_raise_ValueError(MP_ERROR_TEXT("compression header"));
}
dict_sz = 1 << dict_opt;
} else {
dict_sz = 1 << -dict_opt;
}
uzlib_uncompress_init(&o->decomp, m_new(byte, dict_sz), dict_sz);
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_uint_t decompio_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
mp_obj_decompio_t *o = MP_OBJ_TO_PTR(o_in);
if (o->eof) {
return 0;
}
o->decomp.dest = buf;
o->decomp.dest_limit = (unsigned char *)buf + size;
int st = uzlib_uncompress_chksum(&o->decomp);
if (st == TINF_DONE) {
o->eof = true;
}
if (st < 0) {
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
return o->decomp.dest - (byte *)buf;
}
#if !MICROPY_ENABLE_DYNRUNTIME
STATIC const mp_rom_map_elem_t decompio_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
};
STATIC MP_DEFINE_CONST_DICT(decompio_locals_dict, decompio_locals_dict_table);
#endif
#if !MICROPY_ENABLE_DYNRUNTIME
STATIC const mp_stream_p_t decompio_stream_p = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
.read = decompio_read,
};
STATIC const mp_obj_type_t decompio_type = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_EXTENDED,
.name = MP_QSTR_DecompIO,
.make_new = decompio_make_new,
.locals_dict = (void *)&decompio_locals_dict,
MP_TYPE_EXTENDED_FIELDS(
.protocol = &decompio_stream_p,
),
};
#endif
STATIC mp_obj_t mod_uzlib_decompress(size_t n_args, const mp_obj_t *args) {
mp_obj_t data = args[0];
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("uzlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);
decomp->source = bufinfo.buf;
decomp->source_limit = (unsigned char *)bufinfo.buf + bufinfo.len;
int st;
bool is_zlib = true;
if (n_args > 1 && MP_OBJ_SMALL_INT_VALUE(args[1]) < 0) {
is_zlib = false;
}
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("uzlib: 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));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_uzlib_decompress_obj, 1, 3, mod_uzlib_decompress);
#if !MICROPY_ENABLE_DYNRUNTIME
STATIC const mp_rom_map_elem_t mp_module_uzlib_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uzlib) },
{ MP_ROM_QSTR(MP_QSTR_decompress), MP_ROM_PTR(&mod_uzlib_decompress_obj) },
{ MP_ROM_QSTR(MP_QSTR_DecompIO), MP_ROM_PTR(&decompio_type) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_uzlib_globals, mp_module_uzlib_globals_table);
const mp_obj_module_t mp_module_uzlib = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&mp_module_uzlib_globals,
};
#endif
// Source files #include'd here to make sure they're compiled in
// only if module is enabled by config setting.
#pragma GCC diagnostic ignored "-Wsign-compare"
#include "lib/uzlib/tinflate.c"
#include "lib/uzlib/tinfzlib.c"
#include "lib/uzlib/tinfgzip.c"
#include "lib/uzlib/adler32.c"
#include "lib/uzlib/crc32.c"
#endif // MICROPY_PY_UZLIB