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Annotation of truecrypt/volume/volumelayout.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 "Volume/EncryptionMode.h"
        !            10: #include "Volume/EncryptionModeCBC.h"
        !            11: #include "Volume/EncryptionModeLRW.h"
        !            12: #include "Volume/EncryptionModeXTS.h"
        !            13: #include "VolumeLayout.h"
        !            14: 
        !            15: namespace TrueCrypt
        !            16: {
        !            17:        VolumeLayout::VolumeLayout ()
        !            18:        {
        !            19:        }
        !            20: 
        !            21:        VolumeLayout::~VolumeLayout ()
        !            22:        {
        !            23:        }
        !            24: 
        !            25:        VolumeLayoutList VolumeLayout::GetAvailableLayouts (VolumeType::Enum type)
        !            26:        {
        !            27:                VolumeLayoutList layouts;
        !            28: 
        !            29:                layouts.push_back (shared_ptr <VolumeLayout> (new VolumeLayoutV1Normal ()));
        !            30:                layouts.push_back (shared_ptr <VolumeLayout> (new VolumeLayoutV1Hidden ()));
        !            31: 
        !            32:                if (type != VolumeType::Unknown)
        !            33:                {
        !            34:                        VolumeLayoutList l;
        !            35: 
        !            36:                        foreach (shared_ptr <VolumeLayout> vl, layouts)
        !            37:                        {
        !            38:                                if (vl->GetType() == type)
        !            39:                                        l.push_back (vl);
        !            40:                        }
        !            41: 
        !            42:                        layouts = l;
        !            43:                }
        !            44: 
        !            45:                return layouts;
        !            46:        }
        !            47: 
        !            48:        shared_ptr <VolumeHeader> VolumeLayout::GetHeader ()
        !            49:        {
        !            50:                if (Header.get() == nullptr)
        !            51:                        Header.reset (new VolumeHeader (GetHeaderSize()));
        !            52: 
        !            53:                return Header;
        !            54:        }
        !            55: 
        !            56:        VolumeLayoutV1Normal::VolumeLayoutV1Normal ()
        !            57:        {
        !            58:                Type = VolumeType::Normal;
        !            59:                HeaderOffset = 0;
        !            60:                HeaderSize = 512;
        !            61: 
        !            62:                SupportedEncryptionAlgorithms = EncryptionAlgorithm::GetAvailableAlgorithms();
        !            63: 
        !            64:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeXTS ()));
        !            65:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeLRW ()));
        !            66:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeCBC ()));
        !            67:        }
        !            68: 
        !            69:        uint64 VolumeLayoutV1Normal::GetDataOffset (uint64 volumeHostSize) const
        !            70:        {
        !            71:                return HeaderSize;
        !            72:        }
        !            73: 
        !            74:        uint64 VolumeLayoutV1Normal::GetDataSize (uint64 volumeHostSize) const
        !            75:        {
        !            76:                return volumeHostSize - GetHeaderSize();
        !            77:        }
        !            78: 
        !            79:        VolumeLayoutV1Hidden::VolumeLayoutV1Hidden ()
        !            80:        {
        !            81:                Type = VolumeType::Hidden;
        !            82:                HeaderOffset = -512 * 3;
        !            83:                HeaderSize = 512;
        !            84: 
        !            85:                SupportedEncryptionAlgorithms = EncryptionAlgorithm::GetAvailableAlgorithms();
        !            86: 
        !            87:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeXTS ()));
        !            88:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeLRW ()));
        !            89:                SupportedEncryptionModes.push_back (shared_ptr <EncryptionMode> (new EncryptionModeCBC ()));
        !            90:        }
        !            91: 
        !            92:        uint64 VolumeLayoutV1Hidden::GetDataOffset (uint64 volumeHostSize) const
        !            93:        {
        !            94:                return volumeHostSize - GetDataSize (volumeHostSize) + HeaderOffset;
        !            95:        }
        !            96: 
        !            97:        uint64 VolumeLayoutV1Hidden::GetDataSize (uint64 volumeHostSize) const
        !            98:        {
        !            99:                return Header->GetHiddenVolumeDataSize ();
        !           100:        }
        !           101: }

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