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115 lines
3 KiB
C
115 lines
3 KiB
C
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/*
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Copyright (c) 2011, 2012, Simon Howard
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Permission to use, copy, modify, and/or distribute this software
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for any purpose with or without fee is hereby granted, provided
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that the above copyright notice and this permission notice appear
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in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef LHASA_LHA_DECODER_H
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#define LHASA_LHA_DECODER_H
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#include "public/lha_decoder.h"
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struct _LHADecoderType {
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/**
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* Callback function to initialize the decoder.
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*
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* @param extra_data Pointer to the extra data area allocated for
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* the decoder.
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* @param callback Callback function to invoke to read more
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* compressed data.
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* @param callback_data Extra pointer to pass to the callback.
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* @return Non-zero for success.
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*/
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int (*init)(void *extra_data,
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LHADecoderCallback callback,
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void *callback_data);
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/**
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* Callback function to free the decoder.
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*
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* @param extra_data Pointer to the extra data area allocated for
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* the decoder.
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*/
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void (*free)(void *extra_data);
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/**
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* Callback function to read (ie. decompress) data from the
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* decoder.
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*
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* @param extra_data Pointer to the decoder's custom data.
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* @param buf Pointer to the buffer in which to store
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* the decompressed data. The buffer is
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* at least 'max_read' bytes in size.
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* @return Number of bytes decompressed.
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*/
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size_t (*read)(void *extra_data, uint8_t *buf);
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/** Number of bytes of extra data to allocate for the decoder. */
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size_t extra_size;
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/** Maximum number of bytes that might be put into the buffer by
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a single call to read() */
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size_t max_read;
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/** Block size. Used for calculating number of blocks for
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progress bar. */
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size_t block_size;
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};
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struct _LHADecoder {
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/** Type of decoder (algorithm) */
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LHADecoderType *dtype;
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/** Callback function to monitor decoder progress. */
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LHADecoderProgressCallback progress_callback;
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void *progress_callback_data;
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/** Last announced block position, for progress callback. */
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unsigned int last_block, total_blocks;
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/** Current position in the decode stream, and total length. */
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size_t stream_pos, stream_length;
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/** Output buffer, containing decoded data not yet returned. */
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unsigned int outbuf_pos, outbuf_len;
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uint8_t *outbuf;
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/** If true, the decoder read() function returned zero. */
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unsigned int decoder_failed;
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/** Current CRC of the output stream. */
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uint16_t crc;
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};
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#endif /* #ifndef LHASA_LHA_DECODER_H */
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