本文整理汇总了C#中IByteReader.GetFileMarker方法的典型用法代码示例。如果您正苦于以下问题：C# IByteReader.GetFileMarker方法的具体用法？C# IByteReader.GetFileMarker怎么用？C# IByteReader.GetFileMarker使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IByteReader的用法示例。
在下文中一共展示了IByteReader.GetFileMarker方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: isFoundAfterFileMarker
/**
* Searches for this subsequence after the current file marker position in the file.
* Moves the file marker to the end of this subsequence.
*
* @param targetFile the binary file to be identified
* @param reverseOrder true if file is being searched from right to left
* @param bigEndian True iff our parent signature is big-endian
*/
public bool isFoundAfterFileMarker(IByteReader targetFile, bool reverseOrder, bool bigEndian) {
int searchDirection = reverseOrder?-1:1;
//get the current file marker
long startPosInFile = targetFile.GetFileMarker();
//Add the minimum offset before start of sequence and update the file marker accordingly
startPosInFile = startPosInFile + (long)(searchDirection * this.getMinSeqOffset());
if (targetFile.GetNumberOfBytes() < startPosInFile)
{
// We're looking for a sequence of bytes at an offset which is longer than the file itself
return false;
}
targetFile.SetFileMarker(startPosInFile);
//start searching for main sequence after the minimum length of the relevant fragments
startPosInFile = startPosInFile + (long)(searchDirection * this.getMinFragLength());
long numFileBytes = reverseOrder?(startPosInFile+1):(targetFile.GetNumberOfBytes() - startPosInFile);
int numSeqBytes = this.getNumBytes();
bool subSeqFound = false;
bool endOfFileReached = false;
while((!subSeqFound) & (!endOfFileReached)) {
if((long)numSeqBytes> numFileBytes) {
endOfFileReached = true;
} else {
//compare sequence with file contents directly at fileMarker position
bool missMatchFound = false;
int byteLoopStart = reverseOrder?numSeqBytes-1:0;
int byteLoopEnd = reverseOrder?0:numSeqBytes-1;
long tempFileMarker = startPosInFile;
for(int iByte=byteLoopStart; (!missMatchFound) && (iByte<=numSeqBytes-1) && (iByte>=0); iByte+=searchDirection) {
missMatchFound = (byteSequence[iByte] != targetFile.GetByte(tempFileMarker));
if(!missMatchFound && showProgress) { System.Console.WriteLine("FLOATING SEQ: A match was found for " + this.getByte(iByte).ToString()); }
tempFileMarker+=searchDirection;
}
if(!missMatchFound) { //subsequence was found at position fileMarker in the file
//Now search for fragments between original fileMarker and startPosInFile
if(reverseOrder) {
long rightFragEnd;
long[] rightFragEndArray = bytePosForRightFragments(targetFile, startPosInFile+1, targetFile.GetFileMarker(), 1, 0, bigEndian);
if(rightFragEndArray.Length == 0) {
missMatchFound = true;
} else {
rightFragEnd = rightFragEndArray[0];
long leftFragEnd;
long[] leftFragEndArray = bytePosForLeftFragments(targetFile, 0, startPosInFile - numSeqBytes, -1, 0, bigEndian);
if(leftFragEndArray.Length == 0) {
missMatchFound = true;
} else {
leftFragEnd = leftFragEndArray[0];
targetFile.SetFileMarker(leftFragEnd-1L);
subSeqFound = true;
}
}
} else { //search is in forward direction
long leftFragEnd;
long[] leftFragEndArray = bytePosForLeftFragments(targetFile, targetFile.GetFileMarker(), startPosInFile-1L, -1, 0, bigEndian);
if(leftFragEndArray.Length == 0) {
missMatchFound = true;
} else {
leftFragEnd = leftFragEndArray[0];
long rightFragEnd;
long[] rightFragEndArray = bytePosForRightFragments(targetFile, startPosInFile + numSeqBytes, targetFile.GetNumberOfBytes()-1L, 1, 0, bigEndian);
if(rightFragEndArray.Length == 0) {
missMatchFound = true;
} else {
rightFragEnd = rightFragEndArray[0];
targetFile.SetFileMarker(rightFragEnd+1L);
subSeqFound = true;
}
}
}
}
if(missMatchFound) {
if (startPosInFile+(long)(searchDirection*numSeqBytes)>=targetFile.GetNumberOfBytes()) {
endOfFileReached = true;
} else {
long numShiftBytes = this.getShift(targetFile.GetByte(startPosInFile+(long)(searchDirection*numSeqBytes))); //reverseOrder?-1:1; // add shift function for the byte at [fileMarker+(searchDirection*numSeqBytes)] in file
numFileBytes -= (numShiftBytes>0)?numShiftBytes:-numShiftBytes;
startPosInFile += numShiftBytes;
if((startPosInFile<0L) || (startPosInFile>=targetFile.GetNumberOfBytes())) {
endOfFileReached = true;
}
}
}
}
}
return subSeqFound;
}