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1 /** | 1 /** |
2 * \file lzma/filter.h | 2 * \file lzma/filter.h |
3 * \brief Common filter related types | 3 * \brief Common filter related types and functions |
4 */ | 4 */ |
5 | 5 |
6 /* | 6 /* |
7 * Author: Lasse Collin | 7 * Author: Lasse Collin |
8 * | 8 * |
9 * This file has been put into the public domain. | 9 * This file has been put into the public domain. |
10 * You can do whatever you want with this file. | 10 * You can do whatever you want with this file. |
11 * | 11 * |
12 * See ../lzma.h for information about liblzma as a whole. | 12 * See ../lzma.h for information about liblzma as a whole. |
13 */ | 13 */ |
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52 * cannot be 64-bit. | 52 * cannot be 64-bit. |
53 */ | 53 */ |
54 lzma_vli id; | 54 lzma_vli id; |
55 | 55 |
56 /** | 56 /** |
57 * \brief Pointer to filter-specific options structure | 57 * \brief Pointer to filter-specific options structure |
58 * | 58 * |
59 * If the filter doesn't need options, set this to NULL. If id is | 59 * If the filter doesn't need options, set this to NULL. If id is |
60 * set to LZMA_VLI_UNKNOWN, options is ignored, and thus | 60 * set to LZMA_VLI_UNKNOWN, options is ignored, and thus |
61 * doesn't need be initialized. | 61 * doesn't need be initialized. |
62 * | |
63 * Some filters support changing the options in the middle of | |
64 * the encoding process. These filters store the pointer of the | |
65 * options structure and communicate with the application via | |
66 * modifications of the options structure. | |
67 */ | 62 */ |
68 void *options; | 63 void *options; |
69 | 64 |
70 } lzma_filter; | 65 } lzma_filter; |
71 | 66 |
72 | 67 |
73 /** | 68 /** |
74 * \brief Test if the given Filter ID is supported for encoding | 69 * \brief Test if the given Filter ID is supported for encoding |
75 * | 70 * |
76 * Return true if the give Filter ID is supported for encoding by this | 71 * Return true if the give Filter ID is supported for encoding by this |
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119 * - LZMA_MEM_ERROR | 114 * - LZMA_MEM_ERROR |
120 * - LZMA_OPTIONS_ERROR: Unsupported Filter ID and its options | 115 * - LZMA_OPTIONS_ERROR: Unsupported Filter ID and its options |
121 * is not NULL. | 116 * is not NULL. |
122 * - LZMA_PROG_ERROR: src or dest is NULL. | 117 * - LZMA_PROG_ERROR: src or dest is NULL. |
123 */ | 118 */ |
124 extern LZMA_API(lzma_ret) lzma_filters_copy(const lzma_filter *src, | 119 extern LZMA_API(lzma_ret) lzma_filters_copy(const lzma_filter *src, |
125 lzma_filter *dest, lzma_allocator *allocator) lzma_nothrow; | 120 lzma_filter *dest, lzma_allocator *allocator) lzma_nothrow; |
126 | 121 |
127 | 122 |
128 /** | 123 /** |
129 * \brief Calculate rough memory requirements for raw encoder | 124 * \brief Calculate approximate memory requirements for raw encoder |
130 * | 125 * |
131 * Because the calculation is rough, this function can be used to calculate | 126 * This function can be used to calculate the memory requirements for |
132 * the memory requirements for Block and Stream encoders too. | 127 * Block and Stream encoders too because Block and Stream encoders don't |
| 128 * need significantly more memory than raw encoder. |
133 * | 129 * |
134 * \param filters Array of filters terminated with | 130 * \param filters Array of filters terminated with |
135 * .id == LZMA_VLI_UNKNOWN. | 131 * .id == LZMA_VLI_UNKNOWN. |
136 * | 132 * |
137 * \return Rough number of bytes of memory required for the given | 133 * \return Number of bytes of memory required for the given |
138 * filter chain when encoding. | 134 * filter chain when encoding. If an error occurs, |
| 135 * for example due to unsupported filter chain, |
| 136 * UINT64_MAX is returned. |
139 */ | 137 */ |
140 extern LZMA_API(uint64_t) lzma_raw_encoder_memusage(const lzma_filter *filters) | 138 extern LZMA_API(uint64_t) lzma_raw_encoder_memusage(const lzma_filter *filters) |
141 lzma_nothrow lzma_attr_pure; | 139 lzma_nothrow lzma_attr_pure; |
142 | 140 |
143 | 141 |
144 /** | 142 /** |
145 * \brief Calculate rough memory requirements for raw decoder | 143 * \brief Calculate approximate memory requirements for raw decoder |
146 * | 144 * |
147 * Because the calculation is rough, this function can be used to calculate | 145 * This function can be used to calculate the memory requirements for |
148 * the memory requirements for Block and Stream decoders too. | 146 * Block and Stream decoders too because Block and Stream decoders don't |
| 147 * need significantly more memory than raw decoder. |
149 * | 148 * |
150 * \param filters Array of filters terminated with | 149 * \param filters Array of filters terminated with |
151 * .id == LZMA_VLI_UNKNOWN. | 150 * .id == LZMA_VLI_UNKNOWN. |
152 * | 151 * |
153 * \return Rough number of bytes of memory required for the given | 152 * \return Number of bytes of memory required for the given |
154 * filter chain when decoding. | 153 * filter chain when decoding. If an error occurs, |
| 154 * for example due to unsupported filter chain, |
| 155 * UINT64_MAX is returned. |
155 */ | 156 */ |
156 extern LZMA_API(uint64_t) lzma_raw_decoder_memusage(const lzma_filter *filters) | 157 extern LZMA_API(uint64_t) lzma_raw_decoder_memusage(const lzma_filter *filters) |
157 lzma_nothrow lzma_attr_pure; | 158 lzma_nothrow lzma_attr_pure; |
158 | 159 |
159 | 160 |
160 /** | 161 /** |
161 * \brief Initialize raw encoder | 162 * \brief Initialize raw encoder |
162 * | 163 * |
163 * This function may be useful when implementing custom file formats. | 164 * This function may be useful when implementing custom file formats. |
164 * | 165 * |
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244 * | 245 * |
245 * \return - LZMA_OK: Encoding was successful. | 246 * \return - LZMA_OK: Encoding was successful. |
246 * - LZMA_BUF_ERROR: Not enough output buffer space. | 247 * - LZMA_BUF_ERROR: Not enough output buffer space. |
247 * - LZMA_OPTIONS_ERROR | 248 * - LZMA_OPTIONS_ERROR |
248 * - LZMA_MEM_ERROR | 249 * - LZMA_MEM_ERROR |
249 * - LZMA_DATA_ERROR | 250 * - LZMA_DATA_ERROR |
250 * - LZMA_PROG_ERROR | 251 * - LZMA_PROG_ERROR |
251 * | 252 * |
252 * \note There is no function to calculate how big output buffer | 253 * \note There is no function to calculate how big output buffer |
253 * would surely be big enough. (lzma_stream_buffer_bound() | 254 * would surely be big enough. (lzma_stream_buffer_bound() |
254 * works only for lzma_stream_buffer_encode().) | 255 * works only for lzma_stream_buffer_encode(); raw encoder |
| 256 * won't necessarily meet that bound.) |
255 */ | 257 */ |
256 extern LZMA_API(lzma_ret) lzma_raw_buffer_encode( | 258 extern LZMA_API(lzma_ret) lzma_raw_buffer_encode( |
257 const lzma_filter *filters, lzma_allocator *allocator, | 259 const lzma_filter *filters, lzma_allocator *allocator, |
258 const uint8_t *in, size_t in_size, uint8_t *out, | 260 const uint8_t *in, size_t in_size, uint8_t *out, |
259 size_t *out_pos, size_t out_size) lzma_nothrow; | 261 size_t *out_pos, size_t out_size) lzma_nothrow; |
260 | 262 |
261 | 263 |
262 /** | 264 /** |
263 * \brief Single-call raw decoder | 265 * \brief Single-call raw decoder |
264 * | 266 * |
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316 * | 318 * |
317 * \return - LZMA_OK | 319 * \return - LZMA_OK |
318 * - LZMA_OPTIONS_ERROR | 320 * - LZMA_OPTIONS_ERROR |
319 * - LZMA_PROG_ERROR | 321 * - LZMA_PROG_ERROR |
320 * | 322 * |
321 * \note Even this function won't validate more options than actually | 323 * \note Even this function won't validate more options than actually |
322 * necessary. Thus, it is possible that encoding the properties | 324 * necessary. Thus, it is possible that encoding the properties |
323 * succeeds but using the same options to initialize the encoder | 325 * succeeds but using the same options to initialize the encoder |
324 * will fail. | 326 * will fail. |
325 * | 327 * |
326 * \note It is OK to skip calling this function if | 328 * \note If lzma_properties_size() indicated that the size |
327 * lzma_properties_size() indicated that the size | 329 * of the Filter Properties field is zero, calling |
328 * of the Filter Properties field is zero. | 330 * lzma_properties_encode() is not required, but it |
| 331 * won't do any harm either. |
329 */ | 332 */ |
330 extern LZMA_API(lzma_ret) lzma_properties_encode( | 333 extern LZMA_API(lzma_ret) lzma_properties_encode( |
331 const lzma_filter *filter, uint8_t *props) lzma_nothrow; | 334 const lzma_filter *filter, uint8_t *props) lzma_nothrow; |
332 | 335 |
333 | 336 |
334 /** | 337 /** |
335 * \brief Decode the Filter Properties field | 338 * \brief Decode the Filter Properties field |
336 * | 339 * |
337 * \param filter filter->id must have been set to the correct | 340 * \param filter filter->id must have been set to the correct |
338 * Filter ID. filter->options doesn't need to be | 341 * Filter ID. filter->options doesn't need to be |
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357 const uint8_t *props, size_t props_size) lzma_nothrow; | 360 const uint8_t *props, size_t props_size) lzma_nothrow; |
358 | 361 |
359 | 362 |
360 /** | 363 /** |
361 * \brief Calculate encoded size of a Filter Flags field | 364 * \brief Calculate encoded size of a Filter Flags field |
362 * | 365 * |
363 * Knowing the size of Filter Flags is useful to know when allocating | 366 * Knowing the size of Filter Flags is useful to know when allocating |
364 * memory to hold the encoded Filter Flags. | 367 * memory to hold the encoded Filter Flags. |
365 * | 368 * |
366 * \param size Pointer to integer to hold the calculated size | 369 * \param size Pointer to integer to hold the calculated size |
367 * \param filters Filter ID and associated options whose encoded | 370 * \param filter Filter ID and associated options whose encoded |
368 * size is to be calculated | 371 * size is to be calculated |
369 * | 372 * |
370 * \return - LZMA_OK: *size set successfully. Note that this doesn't | 373 * \return - LZMA_OK: *size set successfully. Note that this doesn't |
371 * guarantee that filters->options is valid, thus | 374 * guarantee that filter->options is valid, thus |
372 * lzma_filter_flags_encode() may still fail. | 375 * lzma_filter_flags_encode() may still fail. |
373 * - LZMA_OPTIONS_ERROR: Unknown Filter ID or unsupported options. | 376 * - LZMA_OPTIONS_ERROR: Unknown Filter ID or unsupported options. |
374 * - LZMA_PROG_ERROR: Invalid options | 377 * - LZMA_PROG_ERROR: Invalid options |
375 * | 378 * |
376 * \note If you need to calculate size of List of Filter Flags, | 379 * \note If you need to calculate size of List of Filter Flags, |
377 * you need to loop over every lzma_filter entry. | 380 * you need to loop over every lzma_filter entry. |
378 */ | 381 */ |
379 extern LZMA_API(lzma_ret) lzma_filter_flags_size( | 382 extern LZMA_API(lzma_ret) lzma_filter_flags_size( |
380 » » uint32_t *size, const lzma_filter *filters) | 383 » » uint32_t *size, const lzma_filter *filter) |
381 lzma_nothrow lzma_attr_warn_unused_result; | 384 lzma_nothrow lzma_attr_warn_unused_result; |
382 | 385 |
383 | 386 |
384 /** | 387 /** |
385 * \brief Encode Filter Flags into given buffer | 388 * \brief Encode Filter Flags into given buffer |
386 * | 389 * |
387 * In contrast to some functions, this doesn't allocate the needed buffer. | 390 * In contrast to some functions, this doesn't allocate the needed buffer. |
388 * This is due to how this function is used internally by liblzma. | 391 * This is due to how this function is used internally by liblzma. |
389 * | 392 * |
390 * \param filters Filter ID and options to be encoded | 393 * \param filter Filter ID and options to be encoded |
391 * \param out Beginning of the output buffer | 394 * \param out Beginning of the output buffer |
392 * \param out_pos out[*out_pos] is the next write position. This | 395 * \param out_pos out[*out_pos] is the next write position. This |
393 * is updated by the encoder. | 396 * is updated by the encoder. |
394 * \param out_size out[out_size] is the first byte to not write. | 397 * \param out_size out[out_size] is the first byte to not write. |
395 * | 398 * |
396 * \return - LZMA_OK: Encoding was successful. | 399 * \return - LZMA_OK: Encoding was successful. |
397 * - LZMA_OPTIONS_ERROR: Invalid or unsupported options. | 400 * - LZMA_OPTIONS_ERROR: Invalid or unsupported options. |
398 * - LZMA_PROG_ERROR: Invalid options or not enough output | 401 * - LZMA_PROG_ERROR: Invalid options or not enough output |
399 * buffer space (you should have checked it with | 402 * buffer space (you should have checked it with |
400 * lzma_filter_flags_size()). | 403 * lzma_filter_flags_size()). |
401 */ | 404 */ |
402 extern LZMA_API(lzma_ret) lzma_filter_flags_encode(const lzma_filter *filters, | 405 extern LZMA_API(lzma_ret) lzma_filter_flags_encode(const lzma_filter *filter, |
403 uint8_t *out, size_t *out_pos, size_t out_size) | 406 uint8_t *out, size_t *out_pos, size_t out_size) |
404 lzma_nothrow lzma_attr_warn_unused_result; | 407 lzma_nothrow lzma_attr_warn_unused_result; |
405 | 408 |
406 | 409 |
407 /** | 410 /** |
408 * \brief Decode Filter Flags from given buffer | 411 * \brief Decode Filter Flags from given buffer |
409 * | 412 * |
410 * The decoded result is stored into *filters. filters->options is | 413 * The decoded result is stored into *filter. The old value of |
411 * initialized but the old value is NOT free()d. | 414 * filter->options is not free()d. |
412 * | 415 * |
413 * \return - LZMA_OK | 416 * \return - LZMA_OK |
414 * - LZMA_OPTIONS_ERROR | 417 * - LZMA_OPTIONS_ERROR |
415 * - LZMA_MEM_ERROR | 418 * - LZMA_MEM_ERROR |
416 * - LZMA_PROG_ERROR | 419 * - LZMA_PROG_ERROR |
417 */ | 420 */ |
418 extern LZMA_API(lzma_ret) lzma_filter_flags_decode( | 421 extern LZMA_API(lzma_ret) lzma_filter_flags_decode( |
419 » » lzma_filter *filters, lzma_allocator *allocator, | 422 » » lzma_filter *filter, lzma_allocator *allocator, |
420 const uint8_t *in, size_t *in_pos, size_t in_size) | 423 const uint8_t *in, size_t *in_pos, size_t in_size) |
421 lzma_nothrow lzma_attr_warn_unused_result; | 424 lzma_nothrow lzma_attr_warn_unused_result; |
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