huffman.h File Reference

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Macros
#define	HUFFHEAP_SIZE   ((sizeof(double) * 257) + (((sizeof(void *) * 4) + sizeof(double) + sizeof(unsigned long)) * (257 * 3)) + ((sizeof(unsigned long) + sizeof(unsigned long)) * 257))

Functions
unsigned long	huffman_compress (const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long outlen, void *huffheap)
unsigned long	huffman_decompress (const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long outlen, void *huffheap)

Macro Definition Documentation

#define HUFFHEAP_SIZE   ((sizeof(double) * 257) + (((sizeof(void *) * 4) + sizeof(double) + sizeof(unsigned long)) * (257 * 3)) + ((sizeof(unsigned long) + sizeof(unsigned long)) * 257))

Required size of huffheap parameter to compress and decompress

Note: if you change any of the data types in the _huffman_node or _huffman_encode_table structs in huffman.c, this also must be changed.

Function Documentation

unsigned long huffman_compress	(	const unsigned char *	in,
		unsigned long	inlen,
		unsigned char *	out,
		unsigned long	outlen,
		void *	huffheap
	)

Huffman encode a block of data

Parameters

in	Input data
inlen	Input data length
out	Output buffer
outlen	Output buffer length
huffheap	Heap memory to use for compression (must be HUFFHEAP_SIZE in size)

Returns

Size of encoded result or 0 on out buffer overrun

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unsigned long huffman_decompress	(	const unsigned char *	in,
		unsigned long	inlen,
		unsigned char *	out,
		unsigned long	outlen,
		void *	huffheap
	)

Huffman decode a block of data

Parameters

in	Input data
inlen	Length of input data
out	Output buffer
outlen	Length of output buffer
huffheap	Heap memory to use for decompression (must be HUFFHEAP_SIZE in size)

Returns

Size of decoded result or 0 on out buffer overrun or corrupt input data

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