CompressTool
A tool to losslessly compress data, and expand the compressed data again.
Methods |
static CompressTool |
getInstance()
Get a new instance.
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static CompressTool |
getInstance()
Get a new instance. Each instance uses a separate buffer, so multiple
instances can be used concurrently. However each instance alone is not
multithreading safe.
Returns:
a new instance
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static int |
getVariableIntLength(int x)
Get a variable size integer length using Rice coding.
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static int |
getVariableIntLength(int x)
Get a variable size integer length using Rice coding.
Negative values need 5 bytes.
Parameters:
x - the value
Returns:
the number of bytes needed (0-5)
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static int |
readVariableInt(byte[] buff, int pos)
Read a variable size integer using Rice coding.
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static int |
readVariableInt(byte[] buff, int pos)
Read a variable size integer using Rice coding.
Parameters:
buff - the buffer
pos - the position
Returns:
the integer
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static int |
writeVariableInt(byte[] buff, int pos, int x)
Write a variable size integer using Rice coding.
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static int |
writeVariableInt(byte[] buff, int pos, int x)
Write a variable size integer using Rice coding.
Negative values need 5 bytes.
Parameters:
buff - the buffer
pos - the position
x - the value
Returns:
the number of bytes written (0-5)
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byte[] |
compress(byte[] in, String algorithm)
Compressed the data using the specified algorithm.
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byte[] |
compress(byte[] in, String algorithm)
Compressed the data using the specified algorithm. If no algorithm is
supplied, LZF is used
Parameters:
in - the byte array with the original data
algorithm - the algorithm (LZF, DEFLATE)
Returns:
the compressed data
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byte[] |
expand(byte[] in)
Expands the compressed data.
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byte[] |
expand(byte[] in)
Expands the compressed data.
Parameters:
in - the byte array with the compressed data
Returns:
the uncompressed data
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