lzh5_internal.h File Reference

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Macros
#define	DECOMPRESS_LZH5_STATE_SIZE   (6096+16)
	Size of the LZH5 decompression state.
#define	DECOMPRESS_LZH5_DEFAULT_WINDOW_SIZE   (8192)
	Default window size for LZH5 decompression.

Functions
void	decompress_lzh5_init (void *state, FILE *fp, int winsize)
	Initialize the LZH5 decompressor state.
ssize_t	decompress_lzh5_read (void *state, void *buf, size_t len)
	Read decompressed data from the LZH5 stream.
int	decompress_lzh5_pos (void *state)
	Get the current position in the decompressed stream.
void *	decompress_lzh5_full (const char *fn, FILE *fp, size_t cmp_size, size_t size)
	Decompress a full LZH5 file into a buffer.

Detailed Description

Author

Giovanni Bajo giova.nosp@m.nnib.nosp@m.ajo@g.nosp@m.mail.nosp@m..com

Macro Definition Documentation

DECOMPRESS_LZH5_STATE_SIZE

#define DECOMPRESS_LZH5_STATE_SIZE   (6096+16)

Size of the LZH5 decompression state.

Note that this can still be allocated on the stack, as the stack size configured by libdragon is 64KB.

Function Documentation

decompress_lzh5_init()

void decompress_lzh5_init	(	void *	state,
		FILE *	fp,
		int	winsize
	)

Initialize the LZH5 decompressor state.

Parameters

state	Pointer to the decompressor state buffer.
fp	FILE pointer to read compressed data from.
winsize	Window size for the decompressor.

decompress_lzh5_read()

ssize_t decompress_lzh5_read	(	void *	state,
		void *	buf,
		size_t	len
	)

Read decompressed data from the LZH5 stream.

Parameters

state	Pointer to the decompressor state buffer.
buf	Buffer to store decompressed data.
len	Number of bytes to read.

Returns

Number of bytes read, or -1 on error.

decompress_lzh5_pos()

int decompress_lzh5_pos

(

void *

state

)

Get the current position in the decompressed stream.

Parameters

state

Pointer to the decompressor state buffer.

Returns

Current position in the decompressed stream.

decompress_lzh5_full()

void * decompress_lzh5_full	(	const char *	fn,
		FILE *	fp,
		size_t	cmp_size,
		size_t	size
	)

Decompress a full LZH5 file into a buffer.

This function decompresses a full LZH5 file into a memory buffer. The caller should provide a buffer large enough to hold the entire file, or the function will fail.

This function is about 50% faster than using decompress_lzh5_read, as it can assume that the whole decoded file will always be available during decoding.

Parameters

fn	Filename of the file being decompressed, if known
fp	File pointer to the compressed file
cmp_size	Length of the compressed file
size	Length of the file after decompression

Returns

Buffer that contains the decompressed file