/// <summary>
/// Returns the position of the Signature within the stream
/// Searches one page from current location starting at the end of the page
/// </summary>
/// <param name="reader">A positioned reader</param>
/// <returns>The position within the stream or -1 if not found</returns>
public static long FindSignatureInPageBackwards(p4kRecReader reader, byte[] signature)
{
long pos = reader.Position;
byte[] lPage = reader.GetPage( );
for (int i = lPage.Length - 4; i > 0; i--)
{
if (lPage.Skip(i).Take(4).SequenceEqual(signature))
{
// now this should be the start of the item [end of central directory record]
return(pos + i);
}
}
return(-1); // not found...
}
public static readonly byte[] EndOfCentralDirRecord = { 0x50, 0x4B, 0x05, 0x06 }; // (0x06054b50) 4.3.16 End of central directory record:
/// <summary>
/// Returns the position of the Signature within the stream
/// Searches one page from current location
/// </summary>
/// <param name="reader">A positioned reader</param>
/// <returns>The position within the stream or -1 if not found</returns>
public static long FindSignatureInPage(p4kRecReader reader, byte[] signature)
{
long pos = reader.Position;
byte[] lPage = reader.GetPage( );
for (int i = 0; i < lPage.Length - 4; i++)
{
if (lPage.Skip(i).Take(4).SequenceEqual(signature))
{
// now this should be the start of the item
return(pos + i);
}
}
return(-1); // not found...
}
