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/*

* This file is part of the MicroPython project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2014-2016 Paul Sokolovsky

*

* 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 <stdio.h>

#include <string.h>

#include "py/runtime.h"

#include "py/stream.h"

#include "py/mperrno.h"

#if MICROPY_PY_UZLIB

#include "../../lib/uzlib/src/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 unsigned char 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) {

nlr_raise(mp_obj_new_exception(&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_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("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.destSize = 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;

}

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);

STATIC const mp_stream_p_t decompio_stream_p = {

.read = decompio_read,

};

STATIC const mp_obj_type_t decompio_type = {

{ &mp_type_type },

.name = MP_QSTR_DecompIO,

.make_new = decompio_make_new,

.protocol = &decompio_stream_p,

.locals_dict = (void*)&decompio_locals_dict,

};

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->destSize = dest_buf_size;

DEBUG_printf("uzlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);

decomp->source = bufinfo.buf;

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->destSize = 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:

nlr_raise(mp_obj_new_exception_arg1(&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);

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,

};

// Source files #include'd here to make sure they're compiled in

// only if module is enabled by config setting.

#include "../../lib/uzlib/src/tinflate.c"

#include "../../lib/uzlib/src/tinfzlib.c"

#include "../../lib/uzlib/src/tinfgzip.c"

#include "../../lib/uzlib/src/adler32.c"

#include "../../lib/uzlib/src/crc32.c"

#endif // MICROPY_PY_UZLIB