msszdd_decompressor Struct Reference

A decompressor for SZDD compressed files. More...

#include <mspack.h>

Collaboration diagram for msszdd_decompressor:

Data Fields
struct msszddd_header *(*	open )(struct msszdd_decompressor *self, const char *filename)
	Opens a SZDD file and reads the header. More...
void(*	close )(struct msszdd_decompressor *self, struct msszddd_header *szdd)
	Closes a previously opened SZDD file. More...
int(*	extract )(struct msszdd_decompressor *self, struct msszddd_header *szdd, const char *filename)
	Extracts the compressed data from a SZDD file. More...
int(*	decompress )(struct msszdd_decompressor *self, const char *input, const char *output)
	Decompresses an SZDD file to an output file in one step. More...
int(*	last_error )(struct msszdd_decompressor *self)
	Returns the error code set by the most recently called method. More...

Detailed Description

A decompressor for SZDD compressed files.

All fields are READ ONLY.

See also

mspack_create_szdd_decompressor(), mspack_destroy_szdd_decompressor()

Field Documentation

close

void(* msszdd_decompressor::close) (struct msszdd_decompressor *self, struct msszddd_header *szdd)

Closes a previously opened SZDD file.

This closes a SZDD file and frees the msszddd_header associated with it.

The SZDD header pointer is now invalid and cannot be used again.

Parameters

self	a self-referential pointer to the msszdd_decompressor instance being called
szdd	the SZDD file to close

See also

open()

decompress

int(* msszdd_decompressor::decompress) (struct msszdd_decompressor *self, const char *input, const char *output)

Decompresses an SZDD file to an output file in one step.

This opens an SZDD file as input, reads the header, then decompresses the compressed data immediately to an output file, finally closing both the input and output file. It is more convenient to use than open() then extract() then close(), if you do not need to know the SZDD output size or missing character.

Parameters

self	a self-referential pointer to the msszdd_decompressor instance being called
input	the filename of the input SZDD file. This is passed directly to mspack_system::open().
output	the filename to write the decompressed data to. This is passed directly to mspack_system::open().

Returns

an error code, or MSPACK_ERR_OK if successful

extract

int(* msszdd_decompressor::extract) (struct msszdd_decompressor *self, struct msszddd_header *szdd, const char *filename)

Extracts the compressed data from a SZDD file.

This decompresses the compressed SZDD data stream and writes it to an output file.

Parameters

self	a self-referential pointer to the msszdd_decompressor instance being called
szdd	the SZDD file to extract data from
filename	the filename to write the decompressed data to. This is passed directly to mspack_system::open().

Returns

an error code, or MSPACK_ERR_OK if successful

last_error

int(* msszdd_decompressor::last_error) (struct msszdd_decompressor *self)

Returns the error code set by the most recently called method.

This is useful for open() which does not return an error code directly.

Parameters

self	a self-referential pointer to the msszdd_decompressor instance being called

Returns

the most recent error code

See also

open(), extract(), decompress()

open

struct msszddd_header*(* msszdd_decompressor::open) (struct msszdd_decompressor *self, const char *filename)

Opens a SZDD file and reads the header.

If the file opened is a valid SZDD file, all headers will be read and a msszddd_header structure will be returned.

In the case of an error occuring, NULL is returned and the error code is available from last_error().

The filename pointer should be considered "in use" until close() is called on the SZDD file.

Parameters

self	a self-referential pointer to the msszdd_decompressor instance being called
filename	the filename of the SZDD compressed file. This is passed directly to mspack_system::open().

Returns

a pointer to a msszddd_header structure, or NULL on failure

See also

close()

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The documentation for this struct was generated from the following file:

• mspack.h