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bkWrite.c
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/******************************* LICENCE **************************************
* Any code in this file may be redistributed or modified under the terms of
* the GNU General Public Licence as published by the Free Software
* Foundation; version 2 of the licence.
****************************** END LICENCE ***********************************/
/******************************************************************************
* Author:
* Andrew Smith, http://littlesvr.ca/misc/contactandrew.php
*
* Contributors:
*
******************************************************************************/
/******************************************************************************
* Functions in this file write to volInfo.imageForWriting and are probably
* unsutable for anything else.
******************************************************************************/
#include <strings.h>
#include <string.h>
#include <time.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "bk.h"
#include "bkInternal.h"
#include "bkWrite7x.h"
#include "bkTime.h"
#include "bkWrite.h"
#include "bkMangle.h"
#include "bkError.h"
#include "bkSort.h"
#include "bkPath.h"
#include "bkCache.h"
#include "bkRead7x.h"
#include "bkLink.h"
#include "bkIoWrappers.h"
/******************************************************************************
* bk_write_image()
* Writes everything from first to last byte of the iso.
* Public function.
* */
int bk_write_image(const char* newImagePathAndName, VolInfo* volInfo,
time_t creationTime, int filenameTypes,
void(*progressFunction)(VolInfo*, double))
{
int rc;
DirToWrite newTree;
bk_off_t svdOffset;
bk_off_t pRealRootDrOffset;
int pRootDirSize;
bk_off_t sRealRootDrOffset;
int sRootDirSize;
bk_off_t lPathTable9660Loc;
bk_off_t mPathTable9660Loc;
int pathTable9660Size;
bk_off_t lPathTableJolietLoc;
bk_off_t mPathTableJolietLoc;
int pathTableJolietSize;
bk_off_t bootCatalogSectorNumberOffset;
bk_off_t currPos;
volInfo->writeProgressFunction = progressFunction;
volInfo->stopOperation = false;
volInfo->estimatedIsoSize = bk_estimate_iso_size(volInfo, filenameTypes);
progressFunction(volInfo, 0);
BkStatStruct statStruct;
rc = bkStat(newImagePathAndName, &statStruct);
if(rc == 0 && statStruct.st_ino == volInfo->imageForReadingInode)
return BKERROR_SAVE_OVERWRITE;
/* because mangleDir works on dir's children i need to
* copy the root manually */
memset(&newTree, 0, sizeof(DirToWrite));
newTree.base.posixFileMode = volInfo->dirTree.base.posixFileMode;
printf("mangling\n");fflush(NULL);
/* create tree to write */
rc = mangleDir(&(volInfo->dirTree), &newTree, filenameTypes);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
return rc;
}
printf("opening '%s' for writing\n", newImagePathAndName);fflush(NULL);
volInfo->imageForWriting = open(newImagePathAndName,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR);
if(volInfo->imageForWriting == -1)
{
freeDirToWriteContents(&newTree);
return BKERROR_OPEN_WRITE_FAILED;
}
printf("writing blank at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
/* system area, always zeroes */
rc = writeByteBlock(volInfo, 0, NBYTES_LOGICAL_BLOCK * NLS_SYSTEM_AREA);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
/* skip pvd (1 block), write it after files */
wcSeekForward(volInfo, NBYTES_LOGICAL_BLOCK);
if(volInfo->bootMediaType != BOOT_MEDIA_NONE)
{
/* el torito volume descriptor */
rc = writeElToritoVd(volInfo, &bootCatalogSectorNumberOffset);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
}
if(filenameTypes & FNTYPE_JOLIET)
/* skip svd (1 block), write it after pvd */
{
svdOffset = wcSeekTell(volInfo);
wcSeekForward(volInfo, NBYTES_LOGICAL_BLOCK);
}
printf("writing terminator at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
/* volume descriptor set terminator */
rc = writeVdsetTerminator(volInfo);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
if(volInfo->bootMediaType != BOOT_MEDIA_NONE)
{
/* write boot catalog sector number */
currPos = wcSeekTell(volInfo);
wcSeekSet(volInfo, bootCatalogSectorNumberOffset);
rc = write731(volInfo, currPos / NBYTES_LOGICAL_BLOCK);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
wcSeekSet(volInfo, currPos);
/* write el torito booting catalog */
rc = writeElToritoBootCatalog(volInfo, &(volInfo->bootRecordSectorNumberOffset));
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
}
/* MAYBE write boot record file now */
if(volInfo->bootMediaType != BOOT_MEDIA_NONE &&
!volInfo->bootRecordIsVisible)
{
int blankSize;
int srcFile; /* either the old image or the boot record file on
* the regular filesystem */
bool srcFileOpened;
/* set up source file pointer */
if(volInfo->bootRecordIsOnImage)
{
srcFile = volInfo->imageForReading;
bkSeekSet(volInfo->imageForReading, volInfo->bootRecordOffset, SEEK_SET);
srcFileOpened = false;
}
else
{
srcFile = open(volInfo->bootRecordPathAndName, O_RDONLY, 0);
if(srcFile == -1)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return BKERROR_OPEN_READ_FAILED;
}
srcFileOpened = true;
}
/* write boot record sector number */
currPos = wcSeekTell(volInfo);
wcSeekSet(volInfo, volInfo->bootRecordSectorNumberOffset);
rc = write731(volInfo, currPos / NBYTES_LOGICAL_BLOCK);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
if(srcFileOpened)
bkClose(srcFile);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
wcSeekSet(volInfo, currPos);
/* file contents */
rc = writeByteBlockFromFile(srcFile, volInfo, volInfo->bootRecordSize);
if(rc < 0)
{
freeDirToWriteContents(&newTree);
if(srcFileOpened)
bkClose(srcFile);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
blankSize = NBYTES_LOGICAL_BLOCK -
volInfo->bootRecordSize % NBYTES_LOGICAL_BLOCK;
/* fill the last sector with 0s */
rc = writeByteBlock(volInfo, 0x00, blankSize);
if(rc < 0)
{
freeDirToWriteContents(&newTree);
if(srcFileOpened)
bkClose(srcFile);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
if(srcFileOpened)
bkClose(srcFile);
}
/* END MAYBE write boot record file now */
printf("sorting 9660\n");
sortDir(&newTree, FNTYPE_9660);
pRealRootDrOffset = wcSeekTell(volInfo);
printf("writing primary directory tree at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
/* 9660 and maybe rockridge dir tree */
rc = writeDir(volInfo, &newTree, 0, 0, 0, creationTime,
filenameTypes & (FNTYPE_9660 | FNTYPE_ROCKRIDGE), true);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
pRootDirSize = rc;
/* joliet dir tree */
if(filenameTypes & FNTYPE_JOLIET)
{
printf("sorting joliet\n");
sortDir(&newTree, FNTYPE_JOLIET);
printf("writing supplementary directory tree at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
sRealRootDrOffset = wcSeekTell(volInfo);
rc = writeDir(volInfo, &newTree, 0, 0, 0, creationTime,
FNTYPE_JOLIET, true);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
sRootDirSize = rc;
}
printf("writing 9660 path tables at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
lPathTable9660Loc = wcSeekTell(volInfo);
rc = writePathTable(volInfo, &newTree, true, FNTYPE_9660);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
pathTable9660Size = rc;
mPathTable9660Loc = wcSeekTell(volInfo);
rc = writePathTable(volInfo, &newTree, false, FNTYPE_9660);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
if(filenameTypes & FNTYPE_JOLIET)
{
printf("writing joliet path tables at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
lPathTableJolietLoc = wcSeekTell(volInfo);
rc = writePathTable(volInfo, &newTree, true, FNTYPE_JOLIET);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
pathTableJolietSize = rc;
mPathTableJolietLoc = wcSeekTell(volInfo);
rc = writePathTable(volInfo, &newTree, false, FNTYPE_JOLIET);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
}
printf("writing files at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
resetWriteStatus(volInfo->fileLocations);
/* all files and offsets/sizes */
rc = writeFileContents(volInfo, &newTree, filenameTypes);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
if(filenameTypes & FNTYPE_ROCKRIDGE)
{
printf("writing long NMs at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
rc = writeLongNMsInDir(volInfo, &newTree);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
}
wcSeekSet(volInfo, NBYTES_LOGICAL_BLOCK * NLS_SYSTEM_AREA);
printf("writing pvd at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
rc = writeVolDescriptor(volInfo, pRealRootDrOffset,
pRootDirSize, lPathTable9660Loc, mPathTable9660Loc,
pathTable9660Size, creationTime, true);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
if(filenameTypes & FNTYPE_JOLIET)
{
wcSeekSet(volInfo, svdOffset);
printf("writing svd at %X\n", (int)wcSeekTell(volInfo));fflush(NULL);
rc = writeVolDescriptor(volInfo, sRealRootDrOffset,
sRootDirSize, lPathTableJolietLoc, mPathTableJolietLoc,
pathTableJolietSize, creationTime, false);
if(rc <= 0)
{
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
unlink(newImagePathAndName);
return rc;
}
}
printf("freeing memory\n");fflush(NULL);
freeDirToWriteContents(&newTree);
bkClose(volInfo->imageForWriting);
return 1;
}
/******************************************************************************
* bootInfoTableChecksum()
* Calculate the checksum to be written into the boot info table.
* */
int bootInfoTableChecksum(int oldImage, FileToWrite* file, unsigned* checksum)
{
int numTrailingBytes; /* to make sure the file size is divisible by 4 */
ssize_t rc;
int srcFile;
unsigned char* contents;
unsigned count;
numTrailingBytes = file->size % 4;
contents = malloc(file->size + numTrailingBytes);
if(contents == NULL)
return BKERROR_OUT_OF_MEMORY;
/* make sure the extra bytes i added are 0s */
memset(contents + file->size, 0, numTrailingBytes);
if(file->onImage)
/* read file from original image */
{
bkSeekSet(oldImage, file->offset, SEEK_SET);
rc = bkRead(oldImage, contents, file->size);
if(rc == -1 || rc != (int)(file->size))
{
free(contents);
return BKERROR_READ_GENERIC;
}
}
else
/* read file from fs */
{
srcFile = open(file->pathAndName, O_RDONLY, 0);
if(srcFile == -1)
{
free(contents);
return BKERROR_OPEN_READ_FAILED;
}
rc = bkRead(srcFile, contents, file->size);
bkClose(srcFile);
if(rc == -1 || rc != (int)(file->size))
{
free(contents);
return BKERROR_READ_GENERIC;
}
}
*checksum = 0;
/* do 32 bit checksum starting from byte 64
* because i check above that the file is divisible by 4 i will not be
* reading wrong memory */
for(count = 64; count < file->size; count += 4)
{
unsigned toAdd;
toAdd = *(contents + count) | (*(contents + count + 1) << 8) |
(*(contents + count + 2) << 16) | (*(contents + count + 3) << 24);
*checksum += toAdd;
}
free(contents);
return 1;
}
/******************************************************************************
* countDirsOnLevel()
* a 'level' is described in ecma119 6.8.2
* it's needed for path tables, don't remember exactly what for
* */
int countDirsOnLevel(const DirToWrite* dir, int targetLevel, int thisLevel)
{
BaseToWrite* child;
int sum;
if(targetLevel == thisLevel)
{
return 1;
}
else
{
sum = 0;
child = dir->children;
while(child != NULL)
{
if( IS_DIR(child->posixFileMode) )
sum += countDirsOnLevel(DIRTW_PTR(child), targetLevel, thisLevel + 1);
child = child->next;
}
return sum;
}
}
/******************************************************************************
* countTreeHeight()
* caller should set heightSoFar to 1
* */
int countTreeHeight(const DirToWrite* dir, int heightSoFar)
{
BaseToWrite* child;
int maxHeight;
int thisHeight;
maxHeight = heightSoFar;
child = dir->children;
while(child != NULL)
{
if( IS_DIR(child->posixFileMode) )
{
thisHeight = countTreeHeight(DIRTW_PTR(child), heightSoFar + 1);
if(thisHeight > maxHeight)
maxHeight = thisHeight;
}
child = child->next;
}
return maxHeight;
}
/******************************************************************************
* elToritoChecksum()
* Algorithm: the sum of all words, including the checksum must trunkate to
* a 16-bit 0x0000
* */
unsigned short elToritoChecksum(const unsigned char* record)
{
short sum;
int i;
sum = 0;
for(i = 0; i < 32; i += 2)
{
sum += *(record + i) | (*(record + i + 1) << 8);
}
return 0xFFFF - sum + 1;
}
/******************************************************************************
* writeByteBlock()
* Fills numBytes with byteToWrite.
* */
int writeByteBlock(VolInfo* volInfo, unsigned char byteToWrite, int numBytes)
{
int rc;
int count;
int numBlocks;
int sizeLastBlock;
memset(volInfo->readWriteBuffer, byteToWrite, READ_WRITE_BUFFER_SIZE);
numBlocks = numBytes / READ_WRITE_BUFFER_SIZE;
sizeLastBlock = numBytes % READ_WRITE_BUFFER_SIZE;
for(count = 0; count < numBlocks; count++)
{
rc = wcWrite(volInfo, volInfo->readWriteBuffer, READ_WRITE_BUFFER_SIZE);
if(rc <= 0)
return rc;
}
if(sizeLastBlock > 0)
{
rc = wcWrite(volInfo, volInfo->readWriteBuffer, sizeLastBlock);
if(rc <= 0)
return rc;
}
return 1;
}
/******************************************************************************
* writeByteBlockFromFile()
* copies numBytes from src into the image to write in blocks of 10K
* */
int writeByteBlockFromFile(int src, VolInfo* volInfo, unsigned numBytes)
{
int rc;
int count;
int numBlocks;
int sizeLastBlock;
numBlocks = numBytes / READ_WRITE_BUFFER_SIZE;
sizeLastBlock = numBytes % READ_WRITE_BUFFER_SIZE;
for(count = 0; count < numBlocks; count++)
{
if(volInfo->stopOperation)
return BKERROR_OPER_CANCELED_BY_USER;
rc = bkRead(src, volInfo->readWriteBuffer, READ_WRITE_BUFFER_SIZE);
if(rc != READ_WRITE_BUFFER_SIZE)
return BKERROR_READ_GENERIC;
rc = wcWrite(volInfo, volInfo->readWriteBuffer, READ_WRITE_BUFFER_SIZE);
if(rc <= 0)
return rc;
}
if(sizeLastBlock > 0)
{
rc = bkRead(src, volInfo->readWriteBuffer, sizeLastBlock);
if(rc != sizeLastBlock)
return BKERROR_READ_GENERIC;
rc = wcWrite(volInfo, volInfo->readWriteBuffer, sizeLastBlock);
if(rc <= 0)
return rc;
}
return 1;
}
/******************************************************************************
* writeDir()
* Writes the contents of a directory. Also writes locations and sizes of
* directory records for directories but not for files.
* Returns data length of the dir written.
* */
int writeDir(VolInfo* volInfo, DirToWrite* dir, int parentLbNum,
int parentNumBytes, int parentPosix, time_t recordingTime,
int filenameTypes, bool isRoot)
{
int rc;
bk_off_t startPos;
int numUnusedBytes;
bk_off_t endPos;
DirToWrite selfDir; /* will have a different filename */
DirToWrite parentDir;
BaseToWrite* child;
if(wcSeekTell(volInfo) % NBYTES_LOGICAL_BLOCK != 0)
return BKERROR_SANITY;
/* names other then 9660 are not used for self and parent */
selfDir.base.name9660[0] = 0x00;
selfDir.base.posixFileMode = dir->base.posixFileMode;
parentDir.base.name9660[0] = 0x01;
parentDir.base.name9660[1] = '\0';
if(isRoot)
parentDir.base.posixFileMode = selfDir.base.posixFileMode;
else
parentDir.base.posixFileMode = parentPosix;
startPos = wcSeekTell(volInfo);
if( startPos % NBYTES_LOGICAL_BLOCK != 0 )
/* this should never happen */
return BKERROR_SANITY;
if(filenameTypes & FNTYPE_JOLIET)
dir->extentNumber2 = startPos / NBYTES_LOGICAL_BLOCK;
else
dir->base.extentNumber = startPos / NBYTES_LOGICAL_BLOCK;
/* write self */
if(isRoot)
{
rc = writeDr(volInfo, BASETW_PTR(&selfDir), recordingTime, true, true, true, filenameTypes);
if(rc < 0)
return rc;
if(filenameTypes & FNTYPE_JOLIET)
dir->base.extentLocationOffset2 = selfDir.base.extentLocationOffset2;
else
dir->base.extentLocationOffset = selfDir.base.extentLocationOffset;
}
else
{
rc = writeDr(volInfo, BASETW_PTR(&selfDir), recordingTime, true, true, false, filenameTypes);
if(rc < 0)
return rc;
}
if(rc < 0)
return rc;
/* write parent */
rc = writeDr(volInfo, BASETW_PTR(&parentDir), recordingTime, true, true, false, filenameTypes);
if(rc < 0)
return rc;
child = dir->children;
/* WRITE children drs */
while(child != NULL)
{
if(IS_DIR(child->posixFileMode))
{
rc = writeDr(volInfo, child, recordingTime,
true, false, false, filenameTypes);
}
else
{
rc = writeDr(volInfo, child, recordingTime,
false, false, false, filenameTypes);
}
if(rc < 0)
return rc;
child = child->next;
}
/* END WRITE children drs */
/* write blank to conclude extent */
numUnusedBytes = NBYTES_LOGICAL_BLOCK -
wcSeekTell(volInfo) % NBYTES_LOGICAL_BLOCK;
rc = writeByteBlock(volInfo, 0x00, numUnusedBytes);
if(rc < 0)
return rc;
if(filenameTypes & FNTYPE_JOLIET)
dir->dataLength2 = wcSeekTell(volInfo) - startPos;
else
dir->dataLength = wcSeekTell(volInfo) - startPos;
/* write subdirectories */
child = dir->children;
while(child != NULL)
{
if(IS_DIR(child->posixFileMode))
{
if(filenameTypes & FNTYPE_JOLIET)
{
rc = writeDir(volInfo, DIRTW_PTR(child), dir->extentNumber2,
dir->dataLength2, BASETW_PTR(dir)->posixFileMode, recordingTime,
filenameTypes, false);
}
else
{
rc = writeDir(volInfo, DIRTW_PTR(child), BASETW_PTR(dir)->extentNumber,
dir->dataLength, BASETW_PTR(dir)->posixFileMode, recordingTime,
filenameTypes, false);
}
if(rc < 0)
return rc;
}
child = child->next;
}
endPos = wcSeekTell(volInfo);
/* SELF extent location and size */
if(filenameTypes & FNTYPE_JOLIET)
wcSeekSet(volInfo, selfDir.base.extentLocationOffset2);
else
wcSeekSet(volInfo, selfDir.base.extentLocationOffset);
if(filenameTypes & FNTYPE_JOLIET)
{
rc = write733(volInfo, dir->extentNumber2);
if(rc <= 0)
return rc;
rc = write733(volInfo, dir->dataLength2);
if(rc <= 0)
return rc;
}
else
{
rc = write733(volInfo, BASETW_PTR(dir)->extentNumber);
if(rc <= 0)
return rc;
rc = write733(volInfo, dir->dataLength);
if(rc <= 0)
return rc;
}
/* END SELF extent location and size */
/* PARENT extent location and size */
if(filenameTypes & FNTYPE_JOLIET)
wcSeekSet(volInfo, parentDir.base.extentLocationOffset2);
else
wcSeekSet(volInfo, parentDir.base.extentLocationOffset);
if(parentLbNum == 0)
/* root, parent is same as self */
{
if(filenameTypes & FNTYPE_JOLIET)
{
rc = write733(volInfo, dir->extentNumber2);
if(rc <= 0)
return rc;
rc = write733(volInfo, dir->dataLength2);
if(rc <= 0)
return rc;
}
else
{
rc = write733(volInfo, BASETW_PTR(dir)->extentNumber);
if(rc <= 0)
return rc;
rc = write733(volInfo, dir->dataLength);
if(rc <= 0)
return rc;
}
}
else
/* normal parent */
{
rc = write733(volInfo, parentLbNum);
if(rc <= 0)
return rc;
rc = write733(volInfo, parentNumBytes);
if(rc <= 0)
return rc;
}
/* END PARENT extent location and size */
/* ALL subdir extent locations and sizes */
child = dir->children;
while(child != NULL)
{
if(IS_DIR(child->posixFileMode))
{
if(filenameTypes & FNTYPE_JOLIET)
{
wcSeekSet(volInfo, child->extentLocationOffset2);
rc = write733(volInfo, DIRTW_PTR(child)->extentNumber2);
if(rc <= 0)
return rc;
rc = write733(volInfo, DIRTW_PTR(child)->dataLength2);
if(rc <= 0)
return rc;
}
else
{
wcSeekSet(volInfo, child->extentLocationOffset);
rc = write733(volInfo, child->extentNumber);
if(rc <= 0)
return rc;
rc = write733(volInfo, DIRTW_PTR(child)->dataLength);
if(rc <= 0)
return rc;
}
}
child = child->next;
}
/* END ALL subdir extent locations and sizes */
wcSeekSet(volInfo, endPos);
if(filenameTypes & FNTYPE_JOLIET)
return dir->dataLength2;
else
return dir->dataLength;
}
/******************************************************************************
* writeDr()
* Writes a directory record.
* Note that it uses only the members of DirToWrite and FileToWrite that are
* the same.
* */
int writeDr(VolInfo* volInfo, BaseToWrite* node, time_t recordingTime, bool isADir,
bool isSelfOrParent, bool isFirstRecord, int filenameTypes)
{
int rc;
unsigned char byte;
char aString[256];
unsigned short aShort;
bk_off_t startPos;
bk_off_t endPos;
unsigned char lenFileId;
unsigned char recordLen;
/* look at the end of the function for an explanation */
writeDrStartLabel:
startPos = wcSeekTell(volInfo);
/* record length is recorded in the end */
wcSeekForward(volInfo, 1);
/* extended attribute record length */
byte = 0;
rc = write711(volInfo, byte);
if(rc <= 0)
return rc;
if(filenameTypes & FNTYPE_JOLIET)
node->extentLocationOffset2 = wcSeekTell(volInfo);
else
node->extentLocationOffset = wcSeekTell(volInfo);
/* location of extent not recorded in this function */
wcSeekForward(volInfo, 8);
/* data length not recorded in this function */
wcSeekForward(volInfo, 8);
/* RECORDING time and date */
epochToShortString(recordingTime, aString);
rc = write711(volInfo, aString[0]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[1]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[2]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[3]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[4]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[5]);
if(rc <= 0)
return rc;
rc = write711(volInfo, aString[6]);
if(rc <= 0)
return rc;
/* END RECORDING time and date */
/* FILE flags */
if(isADir)
/* (only directory bit on) */
byte = 0x02;
else
/* nothing on */
byte = 0x00;
rc = wcWrite(volInfo, (char*)&byte, 1);
if(rc <= 0)
return rc;
/* END FILE flags */
/* file unit size (always 0, non-interleaved mode) */
byte = 0;
rc = write711(volInfo, byte);
if(rc <= 0)
return rc;
/* interleave gap size (also always 0, non-interleaved mode) */
rc = write711(volInfo, byte);
if(rc <= 0)
return rc;
/* volume sequence number (always 1) */
aShort = 1;
rc = write723(volInfo, aShort);
if(rc <= 0)
return rc;
/* LENGTH of file identifier */
if(isSelfOrParent)
lenFileId = 1;
else
{
if(filenameTypes & FNTYPE_JOLIET)
lenFileId = 2 * strlen(node->nameJoliet);
else
/*if(isADir) see microsoft comment below */
lenFileId = strlen(node->name9660);
/*else
lenFileId = strlen(node->name9660) + 2; */
}
rc = write711(volInfo, lenFileId);
if(rc <= 0)
return rc;
/* END LENGTH of file identifier */
/* FILE identifier */
if(isSelfOrParent)
{
/* that byte has 0x00 or 0x01 */
rc = write711(volInfo, node->name9660[0]);
if(rc <= 0)
return rc;
}
else