DataDecompress Event

Fires to decompress a block of data using a custom compression algorithm.

Syntax

class CBDriveDataDecompressEventParams {
public:
  const void *InData();
  int InSize();
  void *OutData();
  int OutSize();
  void SetOutSize(int iOutSize);
  int ResultCode();
  void SetResultCode(int iResultCode);
  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};
// To handle, connect one or more slots to this signal. void DataDecompress(CBDriveDataDecompressEventParams *e);
// Or, subclass CBDrive and override this emitter function. virtual int FireDataDecompress(CBDriveDataDecompressEventParams *e) {...}

Remarks

This event fires when the class needs to decompress a block of data using an application-defined compression algorithm. Please refer to the Compression topic for more information.

This event only needs to be handled by applications that use the CBFSSTORAGE_CM_CUSTOM compression mode. To handle this event properly, applications must decompress all InSize bytes of data in the InData buffer, write the decompressed data to the OutData buffer, and set OutSize to reflect the total number of bytes written to OutData.

Note that OutSize is initially set to the capacity of the OutData buffer, which (under normal circumstances) should be large enough to accommodate all of the decompressed data. Only if the vault is corrupted should the OutData buffer ever be too small to hold the decompressed data; so if this occurs, do not write any data to OutData. Instead, set ResultCode to CBFSSTORAGE_ERR_VAULT_CORRUPTED.

Please refer to the Buffer Parameters topic for more information on how to work with memory buffer event parameters.

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a non-zero value to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.

 
 
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CBFS Storage 2020 Qt Edition - Version 20.0 [Build 7649]