416 lines
9.3 KiB
C++
416 lines
9.3 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Engine specific CRC functions
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//
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//=============================================================================//
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#include "checksum_engine.h"
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#include "bspfile.h"
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#include "filesystem.h"
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#include "filesystem_engine.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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//-----------------------------------------------------------------------------
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// Purpose: For proxy protecting
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// Turns the passed data into a
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// single byte block CRC based on current network sequence number.
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// Input : *base -
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// length -
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// sequence -
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// Output : byte COM_BlockSequenceCRCByte
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//-----------------------------------------------------------------------------
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byte COM_BlockSequenceCRCByte( byte *base, int length, int sequence )
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{
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CRC32_t crc;
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byte *p;
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byte chkb[60 + 4];
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if (sequence < 0)
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{
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Sys_Error("sequence < 0, in COM_BlockSequenceCRCByte\n");
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}
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CRC32_t entry;
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entry = CRC32_GetTableEntry( ( sequence + 1 ) % ( 256 * sizeof(CRC32_t) - 4 ) );
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p = (byte *)&entry;
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// Use up to the first 60 bytes of data and a 4 byte value from the
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// CRC lookup table (divided into the sequence)
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if (length > 60)
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{
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length = 60;
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}
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memcpy (chkb, base, length);
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chkb[length+0] = p[0];
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chkb[length+1] = p[1];
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chkb[length+2] = p[2];
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chkb[length+3] = p[3];
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length += 4;
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// Compute a crc based on the buffer.
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CRC32_Init(&crc);
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CRC32_ProcessBuffer(&crc, chkb, length);
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CRC32_Final(&crc);
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// Chop down to byte size
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return (byte)(crc & 0xFF);
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}
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// YWB: 5/18
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/*
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===================
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bool CRC_File(unsigned short *crcvalue, char *pszFileName)
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Computes CRC for given file. If there is an error opening/reading the file, returns false,
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otherwise returns true and sets the crc value passed to it. The value should be initialized
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with CRC_Init
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==================
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*/
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bool CRC_File(CRC32_t *crcvalue, const char *pszFileName)
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{
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// Always re-init the CRC buffer
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CRC32_Init( crcvalue );
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FileHandle_t fp;
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byte chunk[1024];
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int nBytesRead;
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int nSize;
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nSize = COM_OpenFile(pszFileName, &fp);
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if ( !fp || ( nSize == -1 ) )
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return FALSE;
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// Now read in 1K chunks
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while (nSize > 0)
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{
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if (nSize > 1024)
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nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
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else
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nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);
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// If any data was received, CRC it.
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if (nBytesRead > 0)
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{
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nSize -= nBytesRead;
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CRC32_ProcessBuffer(crcvalue, chunk, nBytesRead);
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}
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// We we are end of file, break loop and return
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if ( g_pFileSystem->EndOfFile( fp ) )
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{
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g_pFileSystem->Close( fp );
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fp = 0;
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break;
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}
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// If there was a disk error, indicate failure.
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else if ( nBytesRead <= 0 || !g_pFileSystem->IsOk(fp) )
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{
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if ( fp )
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g_pFileSystem->Close(fp);
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return FALSE;
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}
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}
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if ( fp )
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g_pFileSystem->Close(fp);
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return TRUE;
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}
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// YWB: 5/18
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/*
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===================
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bool CRC_MapFile(unsigned short *crcvalue, char *pszFileName)
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Computes CRC for given map file. If there is an error opening/reading the file, returns false,
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otherwise returns true and sets the crc value passed to it. The value should be initialized
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with CRC_Init
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For map (.bsp) files, the entity lump is not included in the CRC.
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//FIXME make this work
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==================
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*/
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bool CRC_MapFile(CRC32_t *crcvalue, const char *pszFileName)
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{
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FileHandle_t fp;
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byte chunk[1024];
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int i, l;
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int nBytesRead;
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dheader_t header;
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int nSize;
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lump_t *curLump;
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long startOfs;
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nSize = COM_OpenFile(pszFileName, &fp);
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if ( !fp || ( nSize == -1 ) )
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return false;
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startOfs = g_pFileSystem->Tell(fp);
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// Don't CRC the header.
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if (g_pFileSystem->Read(&header, sizeof(dheader_t), fp) == 0)
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{
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ConMsg("Could not read BSP header for map [%s].\n", pszFileName);
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g_pFileSystem->Close(fp);
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return false;
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}
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i = header.version;
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if ( i < MINBSPVERSION || i > BSPVERSION )
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{
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g_pFileSystem->Close(fp);
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ConMsg("Map [%s] has incorrect BSP version (%i should be %i).\n", pszFileName, i, BSPVERSION);
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return false;
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}
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if ( IsX360() )
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{
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// 360 bsp's store the pc checksum in the flags lump header
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g_pFileSystem->Close(fp);
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*crcvalue = header.lumps[LUMP_MAP_FLAGS].version;
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return true;
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}
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// CRC across all lumps except for the Entities lump
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for (l = 0; l < HEADER_LUMPS; l++)
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{
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if (l == LUMP_ENTITIES)
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continue;
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curLump = &header.lumps[l];
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nSize = curLump->filelen;
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g_pFileSystem->Seek( fp, startOfs + curLump->fileofs, FILESYSTEM_SEEK_HEAD );
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// Now read in 1K chunks
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while (nSize > 0)
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{
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if (nSize > 1024)
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nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
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else
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nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);
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// If any data was received, CRC it.
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if (nBytesRead > 0)
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{
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nSize -= nBytesRead;
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CRC32_ProcessBuffer(crcvalue, chunk, nBytesRead);
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}
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// If there was a disk error, indicate failure.
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if ( !g_pFileSystem->IsOk(fp) )
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{
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if ( fp )
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g_pFileSystem->Close(fp);
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return false;
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}
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}
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}
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if ( fp )
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g_pFileSystem->Close(fp);
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return true;
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}
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bool MD5_MapFile(MD5Value_t *md5value, const char *pszFileName)
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{
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FileHandle_t fp;
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byte chunk[1024];
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int i, l;
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int nBytesRead;
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dheader_t header;
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int nSize;
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lump_t *curLump;
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long startOfs;
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nSize = COM_OpenFile(pszFileName, &fp);
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if ( !fp || ( nSize == -1 ) )
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return false;
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MD5Context_t ctx;
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V_memset( &ctx, 0, sizeof(MD5Context_t) );
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MD5Init( &ctx );
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startOfs = g_pFileSystem->Tell(fp);
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// Don't MD5 the header.
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if (g_pFileSystem->Read(&header, sizeof(dheader_t), fp) == 0)
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{
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ConMsg("Could not read BSP header for map [%s].\n", pszFileName);
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g_pFileSystem->Close(fp);
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return false;
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}
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i = header.version;
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if ( i < MINBSPVERSION || i > BSPVERSION )
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{
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g_pFileSystem->Close(fp);
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ConMsg("Map [%s] has incorrect BSP version (%i should be %i).\n", pszFileName, i, BSPVERSION);
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return false;
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}
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if ( IsX360() )
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{
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// 360 bsp's store the pc checksum in the flags lump header
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g_pFileSystem->Close(fp);
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char versionString[65] = {0};
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V_snprintf( versionString, ARRAYSIZE(versionString), "%d", header.lumps[LUMP_MAP_FLAGS].version );
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V_memcpy( md5value->bits, versionString, MD5_DIGEST_LENGTH );
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return true;
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}
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// MD5 across all lumps except for the Entities lump
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for (l = 0; l < HEADER_LUMPS; l++)
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{
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if (l == LUMP_ENTITIES)
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continue;
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curLump = &header.lumps[l];
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nSize = curLump->filelen;
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g_pFileSystem->Seek( fp, startOfs + curLump->fileofs, FILESYSTEM_SEEK_HEAD );
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// Now read in 1K chunks
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while (nSize > 0)
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{
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if (nSize > 1024)
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nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
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else
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nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);
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// If any data was received, CRC it.
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if (nBytesRead > 0)
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{
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nSize -= nBytesRead;
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MD5Update( &ctx, chunk, nBytesRead );
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}
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// If there was a disk error, indicate failure.
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if ( !g_pFileSystem->IsOk(fp) )
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{
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if ( fp )
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g_pFileSystem->Close(fp);
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return false;
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}
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}
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}
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if ( fp )
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g_pFileSystem->Close(fp);
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MD5Final( md5value->bits, &ctx );
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return true;
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : digest[16] -
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// *pszFileName -
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// bSeed -
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// seed[4] -
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// Output : Returns true on success, false on failure.
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//-----------------------------------------------------------------------------
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bool MD5_Hash_File(unsigned char digest[16], const char *pszFileName, bool bSeed /* = FALSE */, unsigned int seed[4] /* = NULL */)
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{
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FileHandle_t fp;
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byte chunk[1024];
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int nBytesRead;
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MD5Context_t ctx;
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int nSize;
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nSize = COM_OpenFile( pszFileName, &fp );
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if ( !fp || ( nSize == -1 ) )
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return false;
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memset(&ctx, 0, sizeof(MD5Context_t));
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MD5Init(&ctx);
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if (bSeed)
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{
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// Seed the hash with the seed value
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MD5Update( &ctx, (const unsigned char *)&seed[0], 16 );
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}
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// Now read in 1K chunks
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while (nSize > 0)
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{
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if (nSize > 1024)
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nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
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else
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nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);
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// If any data was received, CRC it.
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if (nBytesRead > 0)
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{
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nSize -= nBytesRead;
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MD5Update(&ctx, chunk, nBytesRead);
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}
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// We we are end of file, break loop and return
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if ( g_pFileSystem->EndOfFile( fp ) )
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{
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g_pFileSystem->Close( fp );
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fp = NULL;
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break;
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}
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// If there was a disk error, indicate failure.
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else if ( !g_pFileSystem->IsOk(fp) )
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{
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if ( fp )
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g_pFileSystem->Close(fp);
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return FALSE;
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}
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}
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if ( fp )
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g_pFileSystem->Close(fp);
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MD5Final(digest, &ctx);
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return TRUE;
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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//-----------------------------------------------------------------------------
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bool MD5_Hash_Buffer( unsigned char pDigest[16], const unsigned char *pBuffer, int nSize, bool bSeed /* = FALSE */, unsigned int seed[4] /* = NULL */ )
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{
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MD5Context_t ctx;
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if ( !pBuffer || !nSize )
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return false;
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memset( &ctx, 0, sizeof( MD5Context_t ) );
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MD5Init( &ctx );
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if ( bSeed )
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{
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// Seed the hash with the seed value
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MD5Update( &ctx, (const unsigned char *)&seed[0], 16 );
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}
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// Now read in 1024 chunks
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const unsigned char *pChunk = pBuffer;
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while ( nSize > 0 )
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{
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const int nChunkSize = MIN( 1024, nSize );
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MD5Update( &ctx, pChunk, nChunkSize );
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nSize -= nChunkSize;
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pChunk += nChunkSize; AssertValidReadPtr( pChunk );
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}
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MD5Final( pDigest, &ctx );
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return true;
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}
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