BinData Objective-C Reference Documentation
CkoBinData
Current Version: 11.0.0
Container for binary data. Provides methods for getting, setting, appending, etc. in binary and string encoded formats.
Object Creation
CkoBinData *obj = [[CkoBinData alloc] init];
Properties
DebugLogFilePath
If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.
Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.
Possible causes of hangs include:
- A timeout property set to 0, indicating an infinite timeout.
- A hang occurring within an event callback in the application code.
- An internal bug in the Chilkat code causing the hang.
LastErrorHtml
Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
topLastErrorText
Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
LastErrorXml
Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
topLastMethodSuccess
Indicates the success or failure of the most recent method call: YES
means success, NO
means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.
NumBytes
The number of bytes contained within the object.
topVerboseLogging
If set to YES
, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is NO
. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.
Version
Methods
AppendBd
AppendBinary
AppendBom
Appends the appropriate BOM (byte order mark), also known as a "preamble", for the given charset. If the charset has no defined BOM, then nothing is appended. An application would typically call this to append the utf-8, utf-16, or utf-32 BOM.
Returns YES for success, NO for failure.
topAppendByte
Appends a single byte. The byteValue should be a value from 0 to 255.
Returns YES for success, NO for failure.
topAppendCountedString
bigEndian:(BOOL)bigEndian
str:(NSString *)str
charset:(NSString *)charset;
Appends a byte count followed by the string in the desired character encoding, such as "utf-8". The numCountBytes is the size in bytes of the integer to represent the byte count. If 0, then a minimal number of bytes is used. If bigEndian is YES
, the byte count is appended in big endian byte ordering, otherwise little-ending byte ordering. The str is the string to be appended. The charset is the character encoding, such as "utf-8", "utf-16", "windows-1252", etc.
Returns YES for success, NO for failure.
topAppendData
numBytes:(NSNumber *)numBytes;
AppendEncoded
encoding:(NSString *)encoding;
Appends encoded binary data to the current data. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns YES for success, NO for failure.
AppendEncodedSb
Decodes the contents of sb and appends the decoded bytes to this object. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns YES for success, NO for failure.
AppendInt2
littleEndian:(BOOL)littleEndian;
Appends a 16-bit integer (2 bytes). If littleEndian is YES
, then the integer bytes are appended in little-endian byte order, otherwise big-endian byte order is used.
Returns YES for success, NO for failure.
AppendInt4
littleEndian:(BOOL)littleEndian;
Appends a 32-bit integer (4 bytes). If littleEndian is YES
, then the integer bytes are appended in little-endian byte order, otherwise big-endian byte order is used.
Returns YES for success, NO for failure.
AppendPadded
charset:(NSString *)charset
padWithSpace:(BOOL)padWithSpace
fieldLen:(NSNumber *)fieldLen;
Appends a string to this object, padded to the fieldLen with NULL or SPACE chars. If padWithSpace is YES
, then SPACE chars are used and the string is not null-terminated. If fieldLen is NO
, then null bytes are used. The charset controls the byte representation to use, such as "utf-8".
Note: This call will always append a total number of bytes equal to fieldLen. If the str is longer than fieldLen, the method returns NO
to indicate failure and nothing is appended.
Returns YES for success, NO for failure.
AppendSb
AppendString
charset:(NSString *)charset;
Appends a string to this object. (This does not append the BOM. If a BOM is required, the AppendBom method can be called to append the appropriate BOM.)
Returns YES for success, NO for failure.
ByteSwap
Does either 16-bit or 32-bit byte swapping of the entire contents. If size equals 16, then swaps in 2 bytes (e.g., 0x1234 → 0x3412). If size equals 32, then swaps 4 bytes (e.g., 0x12345678 → 0x78563412)
Returns YES for success, NO for failure.
topCharsetConvert
toCharset:(NSString *)toCharset
allOrNone:(BOOL)allOrNone;
This method converts the character encoding of an object's contents from one format to another, such as from Windows-1252 to UTF-8. The allOrNone parameter determines error handling for unrepresentable bytes. If allOrNone is YES
, the object's contents remain unchanged when errors occur. If NO
, error bytes are discarded. The method returns YES
if successful and NO
if errors occur.
Returns YES for success, NO for failure.
topClear
ContentsEqual
Return YES
if the contents of this object equals the contents of binData.
FindString
startIdx:(NSNumber *)startIdx
charset:(NSString *)charset;
Return the index where the first occurrence of str is found. Return -1 if not found. The startIdx indicates the byte index where the search begins. The charset specifies the byte representation of str that is to be searched. For example, it can be "utf-8", "windows-1252", "ansi", "utf-16", etc.
topGetBinary
GetBinaryChunk
numBytes:(NSNumber *)numBytes;
GetByte
Returns the value of the byte at the given index. The returned value is an integer from 0 to 255.
Returns YES for success, NO for failure.
topGetData
GetDataChunk
numBytes:(NSNumber *)numBytes;
GetEncoded
Retrieves the binary data as an encoded string. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns nil
on failure
GetEncodedChunk
numBytes:(NSNumber *)numBytes
encoding:(NSString *)encoding;
Retrieves a chunk of the binary data and returns it in encoded form. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns nil
on failure
GetEncodedSb
Writes the encoded data to a StringBuilder. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns YES for success, NO for failure.
GetHash
encoding:(NSString *)encoding;
Returns the hash of the contents of this object. The algorithm is the hash algorithm, and can be "sha1", "sha256", "sha384", "sha512", "sha3-224", "sha3-256", "sha3-384", "sha3-512", "md2", "md5", "ripemd128", "ripemd160","ripemd256", or "ripemd320". The encoding can be "base64", "modBase64", "base64Url", "base32", "base58", "qp" (for quoted-printable), "url" (for url-encoding), "hex", "hexLower", or any of the encodings found at Chilkat Binary Encodings List.
Returns nil
on failure
GetInt2
littleEndian:(BOOL)littleEndian;
Returns the value of the 16-bit signed integer stored in big-endian or little-endian byte ordering at the given index.
topGetInt4
littleEndian:(BOOL)littleEndian;
Returns the value of the 32-bit signed integer stored in big-endian or little-endian byte ordering at the given index.
topGetString
Interprets the bytes according to charset and returns the string. The charset can be "utf-8", "utf-16", "ansi", "iso-8859-*", "windows-125*", or any of the supported character encodings listed in the link below.
Returns nil
on failure
GetTextChunk
numBytes:(NSNumber *)numBytes
charset:(NSString *)charset;
Returns numBytes bytes starting at startIdx. The bytes are interpreted according to charset (for example, "utf-8", "ansi", "utf-16", "windows-1252", etc.)
Returns nil
on failure
GetUInt2
littleEndian:(BOOL)littleEndian;
Returns the value of the 16-bit unsigned integer stored in big-endian or little-endian byte ordering at the given index.
topGetUInt4
littleEndian:(BOOL)littleEndian;
Returns the value of the 32-bit unsigned integer stored in big-endian or little-endian byte ordering at the given index.
topIsValidUtf8
Returns YES
if this object contains valid utf-8 byte sequences. Any invalid byte sequence that is not valid utf-8 will cause this function to return NO
.
Returns YES for success, NO for failure.
topLoadBinary
Loads binary data and replaces the current contents, if any.
Returns YES for success, NO for failure.
topLoadEncoded
encoding:(NSString *)encoding;
Loads binary data from an encoded string, replacing the current contents, if any. The encoding may be "Base64", "modBase64", "base64Url", "Base32", "Base58", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", or any of the encodings found at Chilkat Binary Encodings List.
Returns YES for success, NO for failure.
topLoadFile
RemoveByteVal
Removes bytes having a specified value (0-255). For example, to remove all null bytes, pass 0 in value.
topRemoveChunk
numBytes:(NSNumber *)numBytes;
SecureClear
Securely clears the contents by writing 0 bytes to the memory prior to deallocating the internal memory.
Returns YES for success, NO for failure.
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