CkByteData C++ Reference Documentation

CkByteData

Current Version: 9.5.0.97

Represents a chunk of byte data and provides methods for accessing it, adding to it, or saving and loading from files.

Object Creation

// Local variable on the stack
CkByteData obj;

// Dynamically allocate/delete
CkByteData *pObj = new CkByteData();
// ...
delete pObj;

Properties

SecureClear
bool get_SecureClear(void);
void put_SecureClear(bool newVal);
Introduced in version 9.5.0.73

If set to true, then memory is always first overwritten with zero bytes prior to deallocation. The default value of this property is false.

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Methods

append
void append(CkByteData &db);

Appends byte data to the data already contained in the object.

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append2
void append2(const void *pByteData, unsigned long szByteData);

Appends bytes to the data already contained in the object.

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appendChar
void appendChar(char ch);

Appends a single byte.

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appendCharN
void appendCharN(char ch, int numTimes);

Appends a single char N times. The equivalent of calling appendChar N times.

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appendEncoded
void appendEncoded(const char *str, const char *encoding);

Appends binary data from an encoded string. The encoding can be specified as "hex", "base64", "url", "quoted-printable", "modBase64", "base58", or "base32". The input string is decoded from the specified encoding and the binary data is appended to the calling object's content.

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appendEncodedW
void appendEncodedW(const wchar_t *str, const wchar_t *encoding);

To be documented soon...

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appendFile
bool appendFile(const char *path);

Opens a file for binary read, appends the file contents, and closes the file.

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appendFileW
bool appendFileW(const wchar_t *path);

Opens a file for binary read, appends the file contents, and closes the file.

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appendInt
void appendInt(int intValue, bool littleEndian);

Appends a 32-bit signed integer (4 bytes) to the data already contained in the object. littleEndian determines whether the big endian or little endian byte ordering is used.

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appendRandom
void appendRandom(int numBytes);

Appends numBytes random bytes to the data already contained within the object.

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appendRange
void appendRange(CkByteData &byteData, unsigned long index, unsigned long numBytes);

Appends a range of bytes from byteData to the data contained withing the caller. The first byte is at index 0.

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appendShort
void appendShort(short shortValue, bool littleEndian);

Appends a 16-bit signed integer (2 bytes) to the data already contained in the object. littleEndian determines whether the big endian or little endian byte ordering is used.

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appendStr
void appendStr(const char *str);

Appends a null-terminated string to the data, without including the terminating null.

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appendStrW
void appendStrW(const wchar_t *str, const wchar_t *charset);

To be documented soon...

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beginsWith
bool beginsWith(CkByteData &byteDataObj);

Returns true if the caller's data begins with the exact bytes contained within byteDataObj.

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beginsWith2
bool beginsWith2(const void *pByteData, unsigned long szByteData);

Returns true if the caller's data begins with specified bytes.

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borrowData
void borrowData(const void *pByteData, unsigned long szByteData);

Sets the CkByteData's data pointer and size to memory outside the object. This is useful in cases where a CkByteData object is needed, but copying data into the CkByteData is not desired.

Note: The borrowData method can only be used for data that is being passed into a Chilkat method call. It is not for use as a buffer for Chilkat to deposit data. This is not the intent of the method.

More Information and Examples
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byteSwap4321
void byteSwap4321(void);

4321 byte swaps the data contained within the object.

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clear
void clear(void);

Clears the CkByteData object of all data. The internal memory is deallocated. To clear without deallocating, call dropData instead.

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dropData
void dropData(void);
Introduced in version 9.5.0.91

Sets the size of the data to 0. Does not deallocate the existing internal buffer. (This is a fast way of "clearing" the CkByteData object, such that the existing data remains in memory and is overwritten on the next append.)

If the SecureClear property is set to true, then the internal memory buffer is zeroed out before resetting the size to 0.

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encode
void encode(const char *encoding, CkString &str);

Encodes binary data according to the encoding requested. The encoding can be specified as "hex", "base64", "url", "quoted-printable", "modBase64", "base58", "base32", "qp-", "url_rfc1738", "url_rfc2396", or "url_rfc3986".

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encodeW
void encodeW(const wchar_t *encoding, CkString &str);

To be documented soon...

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ensureBuffer
bool ensureBuffer(unsigned long expectedNumBytes);

This method can be called to help optimize internal memory re-allocation. If, for example, many calls will be made to append data, and the total size is approximately known, then this method can be called to pre-allocate the internal buffer to the expected total size.

If the internal buffer is already larger than the expectedNumBytes then nothing happens. The existing internal buffer is kept.

Returns true for success, false for failure.

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equals
bool equals(CkByteData &compareBytes);

Returns true if compareBytes contains exactly the same content as the caller. Otherwise returns false.

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equals2
bool equals2(const void *pCompareBytes, unsigned long numBytes);

Returns true if the bytes pointed to by pCompareBytes contains exactly the same content as the caller. Otherwise returns false.

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findBytes
int findBytes(CkByteData &byteDataObj);

Locates the first occurrence of the bytes contained in byteDataObj and returns the index of where these bytes occur in the caller's data. Returns -1 if not found.

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findBytes2
int findBytes2(const void *findBytes, unsigned long findBytesLen);

Locates the first occurrence of the specified bytes and returns the index of where these bytes occur in the caller's data. Returns -1 if not found.

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getByte
unsigned char getByte(unsigned long byteIndex);

Returns the Nth byte of the binary data. The 1st byte is at index 0.

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getChar
char getChar(unsigned long byteIndex);

Returns the Nth byte of the binary content as a "char". The 1st byte is at index 0.

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getData
const void *getData(void);

Returns a pointer to the internal buffer. Be careful with this method because if additional data is appended, the data within the object may be relocated and the pointer may cease to be valid.

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getDataAt
const void *getDataAt(unsigned long byteIndex);

Same as getData, except it gets a pointer to the data at a byte offset. (0 = the start of buffer)

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getEncoded
const char *getEncoded(const char *encoding);
Introduced in version 9.5.0.47

Returns the binary data as an encoded string. The encoding may be "base64", "hex", "quoted-printable" (or "qp"), "url", "asc", "url_rfc1738", "url_rfc2396", "url_rfc3986", or "url_oauth".

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getEncodedW
const wchar_t *getEncodedW(const wchar_t *encoding);

The utf-16 version of getEncoded.

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getInt
int getInt(unsigned long byteIndex);

Returns the 4-byte integer located at a specific byte index.

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getRange
const void *getRange(unsigned long byteIndex, unsigned long numBytes);

Copies a range of bytes to a separate internal memory buffer and returns the pointer to the bytes. The returned pointer is only valid while the object exists. Also, any subsequent calls to getRange, getRangeStr, or to_s will invalidate the buffer.

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getShort
short getShort(unsigned long byteIndex);

Returns the 2-byte integer located at a specific byte index.

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getSize
unsigned long getSize(void);

Returns the number of bytes in the data buffer.

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getUInt
unsigned long getUInt(unsigned long byteIndex);

Returns the 4-byte unsigned integer located at a specific byte index.

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getUShort
unsigned short getUShort(unsigned long byteIndex);

Returns the 2-byte unsigned integer located at a specific byte index.

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is7bit
bool is7bit(void);

Returns true if all the bytes are in the range 0x00 to 0x7F.

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loadFile
bool loadFile(const char *path);

Equivalent to clear() followed by appendFile().

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loadFileW
bool loadFileW(const wchar_t *path);

To be documented soon...

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pad
void pad(int blockSize, int paddingScheme);

Pads the data to a multiple of the blockSize using a cryptographic padding scheme specified by paddingScheme. The possible integer values for paddingScheme are the same as those listed for the PaddingScheme property of the CkCrypt2 class.

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removeChunk
void removeChunk(unsigned long startIndex, unsigned long numBytes);

Removes (discards) a range from the data.

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removeData
const void *removeData(void);

Removes the data from the CkByteData object. The caller will receivea pointer to the memory buffer, and is responsible for deleting it.
Example:
unsigned char *data = byteData.removeData();
... do something with the data....
delete [] data;

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replaceChar
void replaceChar(unsigned char existingByteValue, unsigned char replacementByteValue);

Replaces all occurrences of existingByteValue with replacementByteValue.

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saveFile
bool saveFile(const char *path);

Saves the byte data to a file. If the file already exists, it will be overwritten.

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saveFileW
bool saveFileW(const wchar_t *path);

To be documented soon...

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shorten
void shorten(unsigned long numBytes);

Discards N bytes from the end of the data.

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to_ws
const wchar_t *to_ws(const char *charset);

To be documented soon...

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unpad
void unpad(int blockSize, int paddingScheme);

Unpads the data from a multiple of the blockSize to the original data size using a cryptographic padding scheme specified by paddingScheme. The possible integer values for paddingScheme are the same as those listed for the PaddingScheme property of the CkCrypt2 class.

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