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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, TBOOX Open Source Group.
*
* @author ruki
* @file sha256.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "sha256"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_hash_sha256(lua_State* lua)
{
// check
tb_assert_and_check_return_val(lua, 0);
// get the filename
tb_char_t const* filename = luaL_checkstring(lua, 1);
tb_check_return_val(filename, 0);
// load data from file
tb_bool_t ok = tb_false;
tb_stream_ref_t stream = tb_stream_init_from_file(filename, TB_FILE_MODE_RO);
if (stream)
{
// open stream
if (tb_stream_open(stream))
{
// init sha256
tb_sha_t sha;
tb_sha_init(&sha, TB_SHA_MODE_SHA2_256);
// read data and update sha256
tb_byte_t data[TB_STREAM_BLOCK_MAXN];
while (!tb_stream_beof(stream))
{
// read data
tb_long_t real = tb_stream_read(stream, data, sizeof(data));
// ok?
if (real > 0) tb_sha_spak(&sha, data, real);
// no data? continue it
else if (!real)
{
// wait
real = tb_stream_wait(stream, TB_STREAM_WAIT_READ, tb_stream_timeout(stream));
tb_check_break(real > 0);
// has read?
tb_assert_and_check_break(real & TB_STREAM_WAIT_READ);
}
// failed or end?
else break;
}
// exit sha256
tb_byte_t buffer[32];
tb_sha_exit(&sha, buffer, sizeof(buffer));
// make sha256 string
tb_size_t i = 0;
tb_size_t n = sha.digest_len << 2;
tb_char_t s[256] = {0};
for (i = 0; i < n; ++i) tb_snprintf(s + (i << 1), 3, "%02x", buffer[i]);
// save result
lua_pushstring(lua, s);
// ok
ok = tb_true;
}
// exit stream
tb_stream_exit(stream);
}
// failed? return nil
if (!ok) lua_pushnil(lua);
// ok
return 1;
}
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