huffman.c File Reference

#include "huffman.h"

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Classes
struct	_huffman_node
struct	_huffman_encode_table

Functions
static void	_huffman_write_tree_and_make_encode_table (unsigned char *out, unsigned long *outbitctr, unsigned long outlen, struct _huffman_encode_table *et, unsigned long code, unsigned int bits, struct _huffman_node *t)
static struct _huffman_node *	_huffman_read_tree (const unsigned char *in, unsigned long *inbitctr, unsigned long inlen, unsigned char **heapptr, unsigned char *heapend)
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)

Function Documentation

static struct _huffman_node* _huffman_read_tree ( const unsigned char *  in, unsigned long *  inbitctr, unsigned long  inlen, unsigned char **  heapptr, unsigned char *  heapend  )

staticread

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static void _huffman_write_tree_and_make_encode_table ( unsigned char *  out, unsigned long *  outbitctr, unsigned long  outlen, struct _huffman_encode_table *  et, unsigned long  code, unsigned int  bits, struct _huffman_node *  t  )

static

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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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