132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/* dvdisaster: Additional error correction for optical media.
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* Copyright (C) 2004-2009 Carsten Gnoerlich.
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* Project home page: http://www.dvdisaster.com
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* Email: carsten@dvdisaster.com -or- cgnoerlich@fsfe.org
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
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* or direct your browser at http://www.gnu.org.
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*/
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#include "dvdisaster.h"
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/***
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*** Conversion between little and big endian words.
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*** Only suitable for non performance critical code.
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*/
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/*
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* Swap bytes in a 32 bit word to convert between little and big endian.
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*/
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guint32 SwapBytes32(guint32 in)
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{
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return
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((in & 0xff000000) >> 24)
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| ((in & 0x00ff0000) >> 8)
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| ((in & 0x0000ff00) << 8)
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| ((in & 0x000000ff) << 24);
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}
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guint64 SwapBytes64(guint64 in)
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{
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return
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((in & 0xff00000000000000ull) >> 56)
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| ((in & 0x00ff000000000000ull) >> 40)
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| ((in & 0x0000ff0000000000ull) >> 24)
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| ((in & 0x000000ff00000000ull) >> 8)
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| ((in & 0x00000000ff000000ull) << 8)
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| ((in & 0x0000000000ff0000ull) << 24)
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| ((in & 0x000000000000ff00ull) << 40)
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| ((in & 0x00000000000000ffull) << 56);
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}
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/***
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*** Convert the EccHeader structure between different endians.
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***/
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/*
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* A debugging function for printing the Ecc header.
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*/
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void print_hex(char *label, guint8 *values, int n)
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{ PrintCLI(label);
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while(n--)
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PrintCLI("%02x ",*values++);
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PrintCLI("\n");
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}
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void print_ecc_header(EccHeader *eh)
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{ char buf[16];
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PrintCLI("\nContents of EccHeader:\n\n");
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strncpy(buf, (char*)eh->cookie, 12); buf[12] = 0;
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PrintCLI("cookie %s\n",buf);
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strncpy(buf, (char*)eh->method, 4); buf[4] = 0;
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PrintCLI("method %s\n",buf);
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print_hex("methodFlags ", (guint8*)eh->methodFlags, 4);
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print_hex("mediumFP ", eh->mediumFP, 16);
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print_hex("mediumSum ", eh->mediumSum, 16);
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print_hex("eccSum ", eh->eccSum, 16);
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print_hex("sectors ", eh->sectors, 8);
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PrintCLI("sectors (native) %lld\n", uchar_to_gint64(eh->sectors));
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PrintCLI("dataBytes %8x\n", eh->dataBytes);
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PrintCLI("eccBytes %8x\n", eh->eccBytes);
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PrintCLI("creatorVersion %8x\n", eh->creatorVersion);
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PrintCLI("neededVersion %8x\n", eh->neededVersion);
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PrintCLI("fpSector %8x\n", eh->fpSector);
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PrintCLI("selfCRC %8x\n", eh->selfCRC);
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print_hex("crcSum ", eh->crcSum, 16);
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PrintCLI("inLast %8x\n", eh->inLast);
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PrintCLI("\n");
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}
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/*
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* This is the most annoying part of the endian conversions.
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*/
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//#define VERBOSE
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void SwapEccHeaderBytes(EccHeader *eh)
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{
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#ifdef VERBOSE
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printf("before swap:\n");
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print_ecc_header(eh);
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#endif
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eh->dataBytes = SwapBytes32(eh->dataBytes);
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eh->eccBytes = SwapBytes32(eh->eccBytes);
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eh->creatorVersion = SwapBytes32(eh->creatorVersion);
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eh->neededVersion = SwapBytes32(eh->neededVersion);
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eh->fpSector = SwapBytes32(eh->fpSector);
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eh->inLast = SwapBytes32(eh->inLast);
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#ifdef VERBOSE
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printf("after swap:\n");
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print_ecc_header(eh);
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#endif
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}
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void SwapDefectiveHeaderBytes(DefectiveSectorHeader *dsh)
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{
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dsh->lba = SwapBytes64(dsh->lba);
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dsh->sectorSize = SwapBytes32(dsh->sectorSize);
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dsh->properties = SwapBytes32(dsh->properties);
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dsh->dshFormat = SwapBytes32(dsh->dshFormat);
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dsh->nSectors = SwapBytes32(dsh->nSectors);
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}
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