legatt
32f4597c4d
- Naming style migrated to camel-case - P7lib logger sources added - Vcpkg manifest, CMake presets and build moved to root - SDL2, Vulkan and RmlUi dependencies added - Logger LOG macro added - Logger configuration - SDL2 window configuration - Vulkan configuration - RmlUi configuration - SDL event loop
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
////////////////////////////////////////////////////////////////////////////////
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// /
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// 2012-2020 (c) Baical /
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// /
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// This library is free software; you can redistribute it and/or /
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// modify it under the terms of the GNU Lesser General Public /
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// License as published by the Free Software Foundation; either /
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// version 3.0 of the License, or (at your option) any later version. /
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// /
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// This library is distributed in the hope that it will be useful, /
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// but WITHOUT ANY WARRANTY; without even the implied warranty of /
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU /
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// Lesser General Public License for more details. /
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// /
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// You should have received a copy of the GNU Lesser General Public /
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// License along with this library. /
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// /
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////////////////////////////////////////////////////////////////////////////////
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#pragma once
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static inline tUINT32 Get_CRC32(tUINT8 *i_pData, size_t i_szCount)
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{
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tUINT32 l_dwResult = 0xFFFFFFFF;
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if ( (NULL == i_pData)
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|| (0 >= i_szCount)
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)
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{
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return l_dwResult;
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}
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#if defined(GTX64) || defined(__linux__) || !defined(_MSC_VER)
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for (size_t l_szI = 0; l_szI < i_szCount; l_szI ++)
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{
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l_dwResult = g_pCRC32_Table[(l_dwResult ^ i_pData[l_szI]) & 0xFF ] ^ (l_dwResult >> 8);
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}
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//Suppress warning that this is not used
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(void)g_ppCRC32_Table;
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#else
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// Register use:
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// eax - CRC32 value
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// ebx - a lot of things
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// ecx - CRC32 value
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// edx - address of end of buffer
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// esi - address of start of buffer
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// edi - CRC32 table
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__asm
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{
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// Save the esi and edi registers
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push esi
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push edi
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mov ecx, l_dwResult // load dwCrc32
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mov edi, g_ppCRC32_Table // Load the CRC32 table
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mov esi, i_pData // Load buffer
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mov ebx, i_szCount // Load dwBytesRead
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lea edx, [esi + ebx] // Calculate the end of the buffer
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crc32loop:
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xor eax, eax // Clear the eax register
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mov bl, byte ptr [esi] // Load the current source byte
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mov al, cl // Copy crc value into eax
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inc esi // Advance the source pointer
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xor al, bl // Create the index into the CRC32 table
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shr ecx, 8
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mov ebx, [edi + eax * 4] // Get the value out of the table
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xor ecx, ebx // xor with the current byte
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cmp edx, esi // Have we reached the end of the buffer?
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jne crc32loop
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// Restore the edi and esi registers
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pop edi
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pop esi
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lea eax, l_dwResult // Load the pointer to dwCrc32
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mov [eax], ecx // Write the result
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}
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#endif
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return l_dwResult;
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}
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// #if defined(_WIN32) || defined(_WIN64)
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// tUINT32 Get_CRC32_SSE4(tUINT8 *i_pData, tUINT32 i_szCount)
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// {
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// tUINT32 l_dwCount = i_szCount >> 2; //count of DWORDs
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// tUINT32 l_dwResult = 0x0;
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//
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// while (l_dwCount--)
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// {
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// l_dwResult = _mm_crc32_u32(l_dwResult, *(DWORD*)i_pData);
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// i_pData += 4;
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// }
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//
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// l_dwCount = i_szCount & 0x3; //bytes count at the tail
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//
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// while (l_dwCount--)
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// {
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// l_dwResult = _mm_crc32_u8(l_dwResult, *i_pData);
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// i_pData ++;
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// }
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//
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// return l_dwResult;
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// }
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// #endif
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