MessageCompressor Class

Properties   Methods   Events   Config Settings   Errors  

The MessageCompressor class compresses data and stores it in the PKCS#7 format.

Syntax

MessageCompressor

Remarks

PKCS#7 (Public Key Cryptography Standard #7) is a common format used to store encrypted and signed data. It is used by a variety of protocols, including S/MIME and CMS.

Property List

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the class with short descriptions. Click on the links for further details.

CompressionLevel Property (MessageCompressor Class)

Compression level to apply (1-9).

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetCompressionLevel();
int SetCompressionLevel(int iCompressionLevel);

Unicode (Windows)
INT GetCompressionLevel();
INT SetCompressionLevel(INT iCompressionLevel);

int secureblackbox_messagecompressor_getcompressionlevel(void* lpObj);
int secureblackbox_messagecompressor_setcompressionlevel(void* lpObj, int iCompressionLevel);

int GetCompressionLevel();
int SetCompressionLevel(int iCompressionLevel);

Default Value

6

Remarks

Use this property to specify the compression level to use, from 1 (the lightest, but quickest) to 9 (the best, but the slowest).

Data Type

Integer

FIPSMode Property (MessageCompressor Class)

Reserved.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetFIPSMode();
int SetFIPSMode(int bFIPSMode);

Unicode (Windows)
BOOL GetFIPSMode();
INT SetFIPSMode(BOOL bFIPSMode);

int secureblackbox_messagecompressor_getfipsmode(void* lpObj);
int secureblackbox_messagecompressor_setfipsmode(void* lpObj, int bFIPSMode);

bool GetFIPSMode();
int SetFIPSMode(bool bFIPSMode);

Default Value

FALSE

Remarks

This property is reserved for future use.

Data Type

Boolean

InputBytes Property (MessageCompressor Class)

Use this property to pass the input to class in the byte array form.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetInputBytes(char* &lpInputBytes, int &lenInputBytes);
int SetInputBytes(const char* lpInputBytes, int lenInputBytes);

Unicode (Windows)
INT GetInputBytes(LPSTR &lpInputBytes, INT &lenInputBytes);
INT SetInputBytes(LPCSTR lpInputBytes, INT lenInputBytes);

int secureblackbox_messagecompressor_getinputbytes(void* lpObj, char** lpInputBytes, int* lenInputBytes);
int secureblackbox_messagecompressor_setinputbytes(void* lpObj, const char* lpInputBytes, int lenInputBytes);

QByteArray GetInputBytes();
int SetInputBytes(QByteArray qbaInputBytes);

Remarks

Assign a byte array containing the data to be processed to this property.

This property is not available at design time.

Data Type

Byte Array

InputFile Property (MessageCompressor Class)

Path to the source (uncompressed) file.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetInputFile();
int SetInputFile(const char* lpszInputFile);

Unicode (Windows)
LPWSTR GetInputFile();
INT SetInputFile(LPCWSTR lpszInputFile);

char* secureblackbox_messagecompressor_getinputfile(void* lpObj);
int secureblackbox_messagecompressor_setinputfile(void* lpObj, const char* lpszInputFile);

QString GetInputFile();
int SetInputFile(QString qsInputFile);

Default Value

""

Remarks

Use this property to provide the compression source.

Data Type

String

OutputBytes Property (MessageCompressor Class)

Use this property to read the output the class object has produced.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetOutputBytes(char* &lpOutputBytes, int &lenOutputBytes);

Unicode (Windows)
INT GetOutputBytes(LPSTR &lpOutputBytes, INT &lenOutputBytes);

int secureblackbox_messagecompressor_getoutputbytes(void* lpObj, char** lpOutputBytes, int* lenOutputBytes);

QByteArray GetOutputBytes();

Remarks

Read the contents of this property after the operation is completed to read the produced output. This property will only be set if OutputFile and OutputStream properties had not been assigned.

This property is read-only and not available at design time.

Data Type

Byte Array

OutputFile Property (MessageCompressor Class)

Path to the destination (compressed) file.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetOutputFile();
int SetOutputFile(const char* lpszOutputFile);

Unicode (Windows)
LPWSTR GetOutputFile();
INT SetOutputFile(LPCWSTR lpszOutputFile);

char* secureblackbox_messagecompressor_getoutputfile(void* lpObj);
int secureblackbox_messagecompressor_setoutputfile(void* lpObj, const char* lpszOutputFile);

QString GetOutputFile();
int SetOutputFile(QString qsOutputFile);

Default Value

""

Remarks

Use this property to specify the file where the compressed PKCS#7 message is to be saved.

Data Type

String

Compress Method (MessageCompressor Class)

Compresses input data into a PKCS7 message.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Compress();

Unicode (Windows)
INT Compress();

int secureblackbox_messagecompressor_compress(void* lpObj);

int Compress();

Remarks

Call this method to compress the data residing provided via InputFile (or InputStream) and save the output in OutputFile (OutputStream).

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Config Method (MessageCompressor Class)

Sets or retrieves a configuration setting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);

char* secureblackbox_messagecompressor_config(void* lpObj, const char* lpszConfigurationString);

QString Config(const QString& qsConfigurationString);

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

DoAction Method (MessageCompressor Class)

Performs an additional action.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* DoAction(const char* lpszActionID, const char* lpszActionParams);

Unicode (Windows)
LPWSTR DoAction(LPCWSTR lpszActionID, LPCWSTR lpszActionParams);

char* secureblackbox_messagecompressor_doaction(void* lpObj, const char* lpszActionID, const char* lpszActionParams);

QString DoAction(const QString& qsActionID, const QString& qsActionParams);

Remarks

DoAction is a generic method available in every class. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insencitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

Error Event (MessageCompressor Class)

Information about errors during PKCS#7 message encryption.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
virtual int FireError(MessageCompressorErrorEventParams *e);

typedef struct {
  int ErrorCode;
  const char *Description;
  int reserved;
} MessageCompressorErrorEventParams;


Unicode (Windows)
virtual INT FireError(MessageCompressorErrorEventParams *e);

typedef struct {
  INT ErrorCode;
  LPCWSTR Description;
  INT reserved;
} MessageCompressorErrorEventParams;

#define EID_MESSAGECOMPRESSOR_ERROR 1

virtual INT SECUREBLACKBOX_CALL FireError(INT &iErrorCode, LPSTR &lpszDescription);

class MessageCompressorErrorEventParams {
public:
  int ErrorCode();

  const QString &Description();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};

// To handle, connect one or more slots to this signal.
void Error(MessageCompressorErrorEventParams *e);

// Or, subclass MessageCompressor and override this emitter function.
virtual int FireError(MessageCompressorErrorEventParams *e) {...}

Remarks

The event is fired in case of exceptional conditions during message processing.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Messages section.

Notification Event (MessageCompressor Class)

This event notifies the application about an underlying control flow event.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
virtual int FireNotification(MessageCompressorNotificationEventParams *e);

typedef struct {
  const char *EventID;
  const char *EventParam;
  int reserved;
} MessageCompressorNotificationEventParams;


Unicode (Windows)
virtual INT FireNotification(MessageCompressorNotificationEventParams *e);

typedef struct {
  LPCWSTR EventID;
  LPCWSTR EventParam;
  INT reserved;
} MessageCompressorNotificationEventParams;

#define EID_MESSAGECOMPRESSOR_NOTIFICATION 2

virtual INT SECUREBLACKBOX_CALL FireNotification(LPSTR &lpszEventID, LPSTR &lpszEventParam);

class MessageCompressorNotificationEventParams {
public:
  const QString &EventID();

  const QString &EventParam();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};

// To handle, connect one or more slots to this signal.
void Notification(MessageCompressorNotificationEventParams *e);

// Or, subclass MessageCompressor and override this emitter function.
virtual int FireNotification(MessageCompressorNotificationEventParams *e) {...}

Remarks

The class fires this event to let the application know about some event, occurrence, or milestone in the component. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the component, the exact action it is performing, or the document being processed, one or both may be omitted.

Config Settings (MessageCompressor Class)

MessageCompressor Config Settings

Base Config Settings

Trappable Errors (MessageCompressor Class)

Error Handling (C++)

Call the GetLastErrorCode() method to obtain the last called method's result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

MessageCompressor Errors