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/*
* Copyright (c) 2022 Hans-Kristian Arntzen for Valve Corporation
*
* SPDX-License-Identifier: MIT
*/
/* Reuses implementation in dxbc_container.cpp from RenderDoc. */
/******************************************************************************
* The MIT License (MIT)
*
* Copyright (c) 2019-2022 Baldur Karlsson
* Copyright (c) 2014 Crytek
*
* 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.
******************************************************************************/
#define VKD3D_DBG_CHANNEL VKD3D_DBG_CHANNEL_SHADER
#include "vkd3d_shader_private.h"
#include "3rdparty/md5/md5.h"
#define DXBC_HASHABLE_PAYLOAD_OFFSET 20
void vkd3d_compute_dxbc_checksum(const void *dxbc, size_t size, uint32_t checksum[4])
{
uint32_t leftover_length;
uint32_t padding_bytes;
const uint8_t *data;
uint32_t block[16];
uint32_t num_bits2;
uint32_t num_bits;
MD5_CTX md5_ctx;
size_t length;
/* This is always called from our code. */
assert(size > DXBC_HASHABLE_PAYLOAD_OFFSET);
memset(&md5_ctx, 0, sizeof(md5_ctx));
memset(block, 0, sizeof(block));
MD5_Init(&md5_ctx);
data = (const uint8_t *)dxbc + DXBC_HASHABLE_PAYLOAD_OFFSET;
length = size - DXBC_HASHABLE_PAYLOAD_OFFSET;
num_bits = length * 8;
num_bits2 = (num_bits >> 2) | 1;
leftover_length = length % 64;
MD5_Update(&md5_ctx, data, length - leftover_length);
data += length - leftover_length;
if (leftover_length >= 56)
{
MD5_Update(&md5_ctx, data, leftover_length);
block[0] = 0x80;
MD5_Update(&md5_ctx, block, 64 - leftover_length);
block[0] = num_bits;
block[15] = num_bits2;
MD5_Update(&md5_ctx, block, 64);
}
else
{
MD5_Update(&md5_ctx, &num_bits, sizeof(num_bits));
if (leftover_length)
MD5_Update(&md5_ctx, data, leftover_length);
padding_bytes = 64 - leftover_length - 4;
block[0] = 0x80;
memcpy((uint8_t *)block + padding_bytes - 4, &num_bits2, 4);
MD5_Update(&md5_ctx, block, padding_bytes);
}
checksum[0] = md5_ctx.a;
checksum[1] = md5_ctx.b;
checksum[2] = md5_ctx.c;
checksum[3] = md5_ctx.d;
}
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