74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* dvdisaster: Additional error correction for optical media.
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* Copyright (C) 2004-2015 Carsten Gnoerlich.
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*
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* Email: carsten@dvdisaster.org -or- cgnoerlich@fsfe.org
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* Project homepage: http://www.dvdisaster.org
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*
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* This file is part of dvdisaster.
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*
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* dvdisaster is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* dvdisaster 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with dvdisaster. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dvdisaster.h"
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#include "scsi-layer.h"
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#include "rs02-includes.h"
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/***
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*** Create an uninitialized CRC buffer
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***/
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CrcBuf *CreateCrcBuf(guint64 sectors)
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{ CrcBuf *cb = g_malloc(sizeof(CrcBuf));
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cb->crcbuf = g_malloc(sectors * sizeof(guint32));
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cb->size = sectors;
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cb->valid = CreateBitmap0(sectors);
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return cb;
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}
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/***
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*** Test a 2048 byte block against the checksum in the buffer
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***/
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int CheckAgainstCrcBuffer(CrcBuf *cb, gint64 idx, unsigned char *buf)
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{ guint32 crc;
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if(idx < 0 || idx >= cb->size)
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return CRC_OUTSIDE_BOUND;
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crc = Crc32(buf, 2048);
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if(!GetBit(cb->valid, idx))
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return CRC_UNKNOWN;
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if(crc == cb->crcbuf[idx])
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return CRC_GOOD;
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return CRC_BAD;
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}
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/***
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*** Clean up
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***/
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void FreeCrcBuf(CrcBuf *cb)
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{
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g_free(cb->crcbuf);
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FreeBitmap(cb->valid);
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g_free(cb);
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}
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