| public LocateBlockWithSignature ( int signature, long endLocation, int minimumBlockSize, int maximumVariableData ) : long | ||
| signature | int | The signature to find. |
| endLocation | long | Location, marking the end of block. |
| minimumBlockSize | int | Minimum size of the block. |
| maximumVariableData | int | The maximum variable data. |
| return | long | |
public long LocateBlockWithSignature(int signature, long endLocation, int minimumBlockSize, int maximumVariableData)
{
long pos = endLocation - minimumBlockSize;
if (pos < 0) {
return -1;
}
long giveUpMarker = Math.Max(pos - maximumVariableData, 0);
// TODO: This loop could be optimised for speed.
do {
if (pos < giveUpMarker) {
return -1;
}
Seek(pos--, SeekOrigin.Begin);
} while (ReadLEInt() != signature);
return Position;
}
// NOTE this returns the offset of the first byte after the signature.
long LocateBlockWithSignature(int signature, long endLocation, int minimumBlockSize, int maximumVariableData)
{
using ( ZipHelperStream les = new ZipHelperStream(baseStream_) ) {
return les.LocateBlockWithSignature(signature, endLocation, minimumBlockSize, maximumVariableData);
}
}
