const func string: lzwCompressLsb (in string: uncompressed, in integer: codeSize)

Compress a string with the Lempel-Ziv-Welch (LZW) compression method. The packing order of bits in bytes is LSB-First (Least Significant Bit First). This compression method is used for GIF files. Compressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

uncompressed - Data to be compressed

codeSize - Number of bits used by the uncompressed data.

Returns:

Compressed byte string of the uncompressed data.

const func string: lzwDecompress (inout lsbBitStream: compressedStream, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed lsbBitStream. The packing order of bits in bytes is LSB-First (Least Significant Bit First). This compression method is used for GIF files. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwDecompressLsb (in string: compressed, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed string. The packing order of bits in bytes is LSB-First (Least Significant Bit First). This compression method is used for GIF files. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwCompressMsb (in string: uncompressed, in integer: codeSize)

Compress a string with the Lempel-Ziv-Welch (LZW) compression method. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in PDF files. Compressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

uncompressed - Data to be compressed

codeSize - Number of bits used by the uncompressed data.

Returns:

Compressed byte string of the uncompressed data.

const func string: lzwDecompress (inout msbBitStream: compressedStream, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed msbBitStream. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in PDF files. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwDecompressMsb (in string: compressed, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed string. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in PDF files. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwCompressMsbEarlyChange (in string: uncompressed, in integer: codeSize)

Compress a string with the Lempel-Ziv-Welch (LZW) compression method. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in TIFF and PDF files. EarlyChange means that the encoding width changes one code too early. Compressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

uncompressed - Data to be compressed

codeSize - Number of bits used by the uncompressed data.

Returns:

Compressed byte string of the uncompressed data.

const func string: lzwDecompressEarlyChange (inout msbBitStream: compressedStream, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed msbBitStream. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in TIFF and PDF files. EarlyChange means that the encoding width changes one code too early. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwDecompressMsbEarlyChange (in string: compressed, in integer: codeSize)

Decompress an Lempel-Ziv-Welch (LZW) compressed string. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in TIFF and PDF files. EarlyChange means that the encoding width changes one code too early. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

Returns:

Decompressed version of the compressed data.

const func string: lzwDecompressEarlyChange (inout msbBitStream: compressedStream, in integer: codeSize, in integer: requestedLength)

Decompress an Lempel-Ziv-Welch (LZW) compressed msbBitStream. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in TIFF and PDF files. EarlyChange means that the encoding width changes one code too early. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

requestedLength - Number of decompressed bytes to be read.

Returns:

Decompressed version of the compressed data.

const func string: lzwDecompressMsbEarlyChange (in string: compressed, in integer: codeSize, in integer: requestedLength)

Decompress an Lempel-Ziv-Welch (LZW) compressed string. The packing order of bits in bytes is MSB-First (Most Significant Bit First). This compression method is used in TIFF and PDF files. EarlyChange means that the encoding width changes one code too early. Decompressing starts with succ(codeSize) bits per coding point and goes up to 12 bits per coding point. The code points 0 to pred(2 ** codeSize) correspond to unchanged data. Code 2 ** codeSize starts a new block with a new table and succ(codeSize) bits per code point. Code succ(2 ** codeSize) marks the end of the compressed data.

Parameters:

compressed - Byte string to be decompressed.

codeSize - Number of bits used by the decompressed data.

requestedLength - Number of decompressed bytes to be read.

Returns:

Decompressed version of the compressed data.