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Annotation of truecrypt/boot/windows/bootencryptedio.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.
        !             3: 
        !             4:  Governed by the TrueCrypt License 2.4 the full text of which is contained
        !             5:  in the file License.txt included in TrueCrypt binary and source code
        !             6:  distribution packages.
        !             7: */
        !             8: 
        !             9: #include "Crypto.h"
        !            10: #include "Platform.h"
        !            11: #include "Bios.h"
        !            12: #include "BootConfig.h"
        !            13: #include "BootDebug.h"
        !            14: #include "BootDiskIo.h"
        !            15: #include "BootEncryptedIo.h"
        !            16: 
        !            17: 
        !            18: BiosResult ReadEncryptedSectors (uint16 destSegment, uint16 destOffset, byte drive, uint64 sector, uint16 sectorCount)
        !            19: {
        !            20:        BiosResult result;
        !            21:        byte sectorBuf[TC_LB_SIZE];
        !            22: 
        !            23:        while (sectorCount-- > 0)
        !            24:        {
        !            25:                result = ReadSectors (sectorBuf, drive, sector, 1);
        !            26: 
        !            27:                if (result != BiosResultSuccess)
        !            28:                        return result;
        !            29: 
        !            30:                if (drive == EncryptedVirtualPartition.Drive && sector >= EncryptedVirtualPartition.StartSector && sector <= EncryptedVirtualPartition.EndSector)
        !            31:                {
        !            32:                        DecryptDataUnits (sectorBuf, &sector, 1, BootCryptoInfo);
        !            33:                }
        !            34: 
        !            35:                CopyMemory (sectorBuf, destSegment, destOffset, sizeof (sectorBuf));
        !            36: 
        !            37:                ++sector;
        !            38:                destOffset += sizeof (sectorBuf);
        !            39:        }
        !            40: 
        !            41:        return result;
        !            42: }
        !            43: 
        !            44: 
        !            45: BiosResult WriteEncryptedSectors (uint16 sourceSegment, uint16 sourceOffset, byte drive, uint64 sector, uint16 sectorCount)
        !            46: {
        !            47:        BiosResult result;
        !            48:        byte sectorBuf[TC_LB_SIZE];
        !            49: 
        !            50:        while (sectorCount-- > 0)
        !            51:        {
        !            52:                CopyMemory (sourceSegment, sourceOffset, sectorBuf, sizeof (sectorBuf));
        !            53: 
        !            54:                if (drive == EncryptedVirtualPartition.Drive && sector >= EncryptedVirtualPartition.StartSector && sector <= EncryptedVirtualPartition.EndSector)
        !            55:                {
        !            56:                        EncryptDataUnits (sectorBuf, &sector, 1, BootCryptoInfo);
        !            57:                }
        !            58: 
        !            59:                result = WriteSectors (sectorBuf, drive, sector, 1);
        !            60: 
        !            61:                if (result != BiosResultSuccess)
        !            62:                        return result;
        !            63: 
        !            64:                ++sector;
        !            65:                sourceOffset += sizeof (sectorBuf);
        !            66:        }
        !            67: 
        !            68:        return result;
        !            69: }

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