[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'idea' (#fcl)

TIDEADeCryptStream.Seek

Set position on the stream

Declaration

Source position: idea.pp line 108

public function TIDEADeCryptStream.Seek(

  const Offset: Int64;

  Origin: TSeekOrigin

):Int64; override;

Arguments

Offset

  

Offset to apply to the position in the stream

Origin

  

Origin from where Offset should be counted.

Function result

New position in the stream

Description

Seek will only work on a forward seek. It emulates a forward seek by reading and discarding bytes from the input stream. The TIDEADecryptStream stream tries to provide seek capabilities for the following limited number of cases:

Origin=soFromBeginning
If Offset is larger than the current position, then the remaining bytes are skipped by reading them from the stream and discarding them.
Origin=soFromCurrent
If Offset is zero, the current position is returned. If it is positive, then Offset bytes are skipped by reading them from the stream and discarding them.

Errors

An EIDEAError exception is raised if the stream does not allow the requested seek operation.

See also

Read

  

Reads data from the stream, decrypting it as needed


Documentation generated on: Jun 23 2021