CkByteData PHP Extension Reference Documentation

CkByteData

Current Version: 11.0.0

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

Object Creation

$obj = new CkByteData();

Properties

SecureClear
bool get_SecureClear()
void put_SecureClear(bool boolVal);
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 Deprecated
void append(CkByteData $db);

Appends byte data 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(string $str, string $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((utf-16) string $str, (utf-16) string $encoding);

To be documented soon...

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appendFile
bool appendFile(string $path);

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

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appendFileW
bool appendFileW((utf-16) string $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 Deprecated
void appendRange(CkByteData $byteData, int $index, int $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(int $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(string $str);

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

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appendStrW
void appendStrW((utf-16) string $str, (utf-16) string $charset);

To be documented soon...

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beginsWith Deprecated
bool beginsWith(CkByteData $byteDataObj);

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

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byteSwap4321
void byteSwap4321();

4321 byte swaps the data contained within the object.

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clear
void clear();

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();
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(string $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((utf-16) string $encoding, CkString $str);

To be documented soon...

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ensureBuffer
bool ensureBuffer(int $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 Deprecated
bool equals(CkByteData $compareBytes);

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

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findBytes Deprecated
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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getByte
byte getByte(int $byteIndex);

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

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getChar
char getChar(int $byteIndex);

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

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getData
(binary) string getData();

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
(binary) string getDataAt(int $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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getEncodedW
(utf-16) string getEncodedW((utf-16) string $encoding);

The utf-16 version of getEncoded.

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getInt
int getInt(int $byteIndex);

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

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getRange
(binary) string getRange(int $byteIndex, int $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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getSize
int getSize();

Returns the number of bytes in the data buffer.

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is7bit
bool is7bit();

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

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loadFile
bool loadFile(string $path);

Equivalent to clear() followed by appendFile().

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loadFileW
bool loadFileW((utf-16) string $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(int $startIndex, int $numBytes);

Removes (discards) a range from the data.

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replaceChar
void replaceChar(byte $existingByteValue, byte $replacementByteValue);

Replaces all occurrences of existingByteValue with replacementByteValue.

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saveFile
bool saveFile(string $path);

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

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saveFileW
bool saveFileW((utf-16) string $path);

To be documented soon...

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shorten
void shorten(int $numBytes);

Discards N bytes from the end of the data.

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to_ws
(utf-16) string to_ws(string $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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