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/*
* Brian Carrier [carrier <at> sleuthkit [dot] org]
* Copyright (c) 2011 Brian Carrier, Basis Technology. All rights reserved
*
* mult_files
*
* This software is distributed under the Common Public License 1.0
*
*/
/**
* \file mult_files.c
* Internal code to find remainder of files in a split raw set
*/
#include "tsk_img_i.h"
// return non-zero if str ends with suffix, ignoring case
static int
endsWith(const TSK_TCHAR * str, const TSK_TCHAR * suffix)
{
if (TSTRLEN(str) >= TSTRLEN(suffix)) {
return (TSTRICMP(&str[TSTRLEN(str) - TSTRLEN(suffix)],
suffix) == 0);
}
return 0;
}
/** Generate the name of the Nth segment of an image, given the starting name.
* If the name scheme isn't recognized, just returns the starting name for
* segment 1 and NULL for subsequent segments.
*
* @param a_startingName First name in the list (must be full name)
* @param a_segmentNumber The file number to generate a name for (starting at 1)
* @returns newly-allocated file name for this segment number or NULL on error
*/
static TSK_TCHAR *
getSegmentName(const TSK_TCHAR * a_startingName, int a_segmentNumber)
{
size_t nameLen = TSTRLEN(a_startingName);
TSK_TCHAR *newName =
(TSK_TCHAR *) tsk_malloc((nameLen + 32) * sizeof(TSK_TCHAR));
// (extra space to allow for .NNN.dmgpart for .dmg file names and for
// large segment numbers, which could be 10 digits for 32-bit int)
if (newName == NULL)
return NULL;
// segment 1 uses the original file name always
TSTRNCPY(newName, a_startingName, nameLen + 1);
if (a_segmentNumber == 1) {
return newName;
}
// .dmg case: second part is .002.dmgpart (etc.)
if (endsWith(a_startingName, _TSK_T(".dmg"))) {
TSNPRINTF(newName + nameLen - 3, 35, _TSK_T("%03d.dmgpart"),
a_segmentNumber);
return newName;
}
// numeric counter case, 3 digit
if (endsWith(a_startingName, _TSK_T(".001")) ||
endsWith(a_startingName, _TSK_T("_001"))) {
// don't limit to 3 digits (FTK produces files named
// foo.1000 for 1000-part DD images)
TSNPRINTF(newName + nameLen - 3, 35, _TSK_T("%03d"),
a_segmentNumber);
return newName;
}
// 0-based numeric counter case, 3 digit
if (endsWith(a_startingName, _TSK_T(".000")) ||
endsWith(a_startingName, _TSK_T("_000"))) {
TSNPRINTF(newName + nameLen - 3, 35, _TSK_T("%03d"),
a_segmentNumber - 1);
return newName;
}
// numeric counter case, 2 digit
if (endsWith(a_startingName, _TSK_T(".01")) ||
endsWith(a_startingName, _TSK_T("_01"))) {
TSNPRINTF(newName + nameLen - 2, 34, _TSK_T("%02d"),
a_segmentNumber);
return newName;
}
// 0-based numeric counter case, 2 digit
if (endsWith(a_startingName, _TSK_T(".00")) ||
endsWith(a_startingName, _TSK_T("_00"))) {
TSNPRINTF(newName + nameLen - 2, 34, _TSK_T("%02d"),
a_segmentNumber - 1);
return newName;
}
// alphabetic counter, 3 character
if (endsWith(a_startingName, _TSK_T(".aaa")) ||
endsWith(a_startingName, _TSK_T("xaaa")) ||
endsWith(a_startingName, _TSK_T("_aaa"))) {
// preserve case for the alpha characters
a_segmentNumber--;
newName[nameLen - 1] += (a_segmentNumber % 26);
a_segmentNumber /= 26;
newName[nameLen - 2] += (a_segmentNumber % 26);
a_segmentNumber /= 26;
newName[nameLen - 3] += (a_segmentNumber % 26);
a_segmentNumber /= 26;
if (a_segmentNumber > 0) {
// too many segments for format
free(newName);
return NULL;
}
return newName;
}
// alphabetic counter, 2 character
if (endsWith(a_startingName, _TSK_T(".aa")) ||
endsWith(a_startingName, _TSK_T("xaa")) ||
endsWith(a_startingName, _TSK_T("_aa"))) {
// preserve case for the alpha characters
a_segmentNumber--;
newName[nameLen - 1] += (a_segmentNumber % 26);
a_segmentNumber /= 26;
newName[nameLen - 2] += (a_segmentNumber % 26);
a_segmentNumber /= 26;
if (a_segmentNumber > 0) {
// too many segments for format
free(newName);
return NULL;
}
return newName;
}
// numeric counter, variable width
if (endsWith(a_startingName, _TSK_T(".bin"))) {
TSNPRINTF(newName + nameLen - 4, 36, _TSK_T("(%d).bin"),
a_segmentNumber);
return newName;
}
// unknown name format
free(newName);
return NULL;
}
/**
* @param a_startingName First name in the list (must be full name)
* @param [out] a_numFound Number of images that are in returned list
* @returns array of names that caller must free (NULL on error or if supplied file does not exist)
*/
TSK_TCHAR **
tsk_img_findFiles(const TSK_TCHAR * a_startingName, int *a_numFound)
{
TSK_TCHAR **retNames = NULL;
TSK_TCHAR *nextName;
TSK_TCHAR **tmpNames;
int fileCount = 0;
struct STAT_STR stat_buf;
*a_numFound = 0;
// iterate through potential segment names
while ((nextName =
getSegmentName(a_startingName, fileCount + 1)) != NULL) {
// does the file exist?
if (TSTAT(nextName, &stat_buf) < 0) {
free(nextName);
break;
}
if (tsk_verbose)
tsk_fprintf(stderr,
"tsk_img_findFiles: %" PRIttocTSK " found\n", nextName);
// add to list
fileCount++;
if (fileCount == 1)
tmpNames = (TSK_TCHAR **) tsk_malloc(sizeof(TSK_TCHAR *));
else
tmpNames =
(TSK_TCHAR **) tsk_realloc(retNames,
fileCount * sizeof(TSK_TCHAR *));
if (tmpNames == NULL) {
if (retNames != NULL)
free(retNames);
return NULL;
}
retNames = tmpNames;
retNames[fileCount - 1] = nextName;
}
if (fileCount <= 0)
return NULL;
if (tsk_verbose)
tsk_fprintf(stderr, "tsk_img_findFiles: %d total segments found\n",
fileCount);
*a_numFound = fileCount;
return retNames;
}
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