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Diffstat (limited to 'src/liblzma/api/lzma/container.h')
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diff --git a/src/liblzma/api/lzma/container.h b/src/liblzma/api/lzma/container.h new file mode 100644 index 0000000..6e432a1 --- /dev/null +++ b/src/liblzma/api/lzma/container.h @@ -0,0 +1,904 @@ +/** + * \file lzma/container.h + * \brief File formats + */ + +/* + * Author: Lasse Collin + * + * This file has been put into the public domain. + * You can do whatever you want with this file. + * + * See ../lzma.h for information about liblzma as a whole. + */ + +#ifndef LZMA_H_INTERNAL +# error Never include this file directly. Use <lzma.h> instead. +#endif + + +/************ + * Encoding * + ************/ + +/** + * \brief Default compression preset + * + * It's not straightforward to recommend a default preset, because in some + * cases keeping the resource usage relatively low is more important that + * getting the maximum compression ratio. + */ +#define LZMA_PRESET_DEFAULT UINT32_C(6) + + +/** + * \brief Mask for preset level + * + * This is useful only if you need to extract the level from the preset + * variable. That should be rare. + */ +#define LZMA_PRESET_LEVEL_MASK UINT32_C(0x1F) + + +/* + * Preset flags + * + * Currently only one flag is defined. + */ + +/** + * \brief Extreme compression preset + * + * This flag modifies the preset to make the encoding significantly slower + * while improving the compression ratio only marginally. This is useful + * when you don't mind wasting time to get as small result as possible. + * + * This flag doesn't affect the memory usage requirements of the decoder (at + * least not significantly). The memory usage of the encoder may be increased + * a little but only at the lowest preset levels (0-3). + */ +#define LZMA_PRESET_EXTREME (UINT32_C(1) << 31) + + +/** + * \brief Multithreading options + */ +typedef struct { + /** + * \brief Flags + * + * Set this to zero if no flags are wanted. + * + * Encoder: No flags are currently supported. + * + * Decoder: Bitwise-or of zero or more of the decoder flags: + * LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK, + * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, + * LZMA_CONCATENATED, LZMA_FAIL_FAST + */ + uint32_t flags; + + /** + * \brief Number of worker threads to use + */ + uint32_t threads; + + /** + * \brief Encoder only: Maximum uncompressed size of a Block + * + * The encoder will start a new .xz Block every block_size bytes. + * Using LZMA_FULL_FLUSH or LZMA_FULL_BARRIER with lzma_code() + * the caller may tell liblzma to start a new Block earlier. + * + * With LZMA2, a recommended block size is 2-4 times the LZMA2 + * dictionary size. With very small dictionaries, it is recommended + * to use at least 1 MiB block size for good compression ratio, even + * if this is more than four times the dictionary size. Note that + * these are only recommendations for typical use cases; feel free + * to use other values. Just keep in mind that using a block size + * less than the LZMA2 dictionary size is waste of RAM. + * + * Set this to 0 to let liblzma choose the block size depending + * on the compression options. For LZMA2 it will be 3*dict_size + * or 1 MiB, whichever is more. + * + * For each thread, about 3 * block_size bytes of memory will be + * allocated. This may change in later liblzma versions. If so, + * the memory usage will probably be reduced, not increased. + */ + uint64_t block_size; + + /** + * \brief Timeout to allow lzma_code() to return early + * + * Multithreading can make liblzma to consume input and produce + * output in a very bursty way: it may first read a lot of input + * to fill internal buffers, then no input or output occurs for + * a while. + * + * In single-threaded mode, lzma_code() won't return until it has + * either consumed all the input or filled the output buffer. If + * this is done in multithreaded mode, it may cause a call + * lzma_code() to take even tens of seconds, which isn't acceptable + * in all applications. + * + * To avoid very long blocking times in lzma_code(), a timeout + * (in milliseconds) may be set here. If lzma_code() would block + * longer than this number of milliseconds, it will return with + * LZMA_OK. Reasonable values are 100 ms or more. The xz command + * line tool uses 300 ms. + * + * If long blocking times are fine for you, set timeout to a special + * value of 0, which will disable the timeout mechanism and will make + * lzma_code() block until all the input is consumed or the output + * buffer has been filled. + * + * \note Even with a timeout, lzma_code() might sometimes take + * somewhat long time to return. No timing guarantees + * are made. + */ + uint32_t timeout; + + /** + * \brief Encoder only: Compression preset + * + * The preset is set just like with lzma_easy_encoder(). + * The preset is ignored if filters below is non-NULL. + */ + uint32_t preset; + + /** + * \brief Encoder only: Filter chain (alternative to a preset) + * + * If this is NULL, the preset above is used. Otherwise the preset + * is ignored and the filter chain specified here is used. + */ + const lzma_filter *filters; + + /** + * \brief Encoder only: Integrity check type + * + * See check.h for available checks. The xz command line tool + * defaults to LZMA_CHECK_CRC64, which is a good choice if you + * are unsure. + */ + lzma_check check; + + /* + * Reserved space to allow possible future extensions without + * breaking the ABI. You should not touch these, because the names + * of these variables may change. These are and will never be used + * with the currently supported options, so it is safe to leave these + * uninitialized. + */ + lzma_reserved_enum reserved_enum1; + lzma_reserved_enum reserved_enum2; + lzma_reserved_enum reserved_enum3; + uint32_t reserved_int1; + uint32_t reserved_int2; + uint32_t reserved_int3; + uint32_t reserved_int4; + + /** + * \brief Memory usage limit to reduce the number of threads + * + * Encoder: Ignored. + * + * Decoder: + * + * If the number of threads has been set so high that more than + * memlimit_threading bytes of memory would be needed, the number + * of threads will be reduced so that the memory usage will not exceed + * memlimit_threading bytes. However, if memlimit_threading cannot + * be met even in single-threaded mode, then decoding will continue + * in single-threaded mode and memlimit_threading may be exceeded + * even by a large amount. That is, memlimit_threading will never make + * lzma_code() return LZMA_MEMLIMIT_ERROR. To truly cap the memory + * usage, see memlimit_stop below. + * + * Setting memlimit_threading to UINT64_MAX or a similar huge value + * means that liblzma is allowed to keep the whole compressed file + * and the whole uncompressed file in memory in addition to the memory + * needed by the decompressor data structures used by each thread! + * In other words, a reasonable value limit must be set here or it + * will cause problems sooner or later. If you have no idea what + * a reasonable value could be, try lzma_physmem() / 4 as a starting + * point. Setting this limit will never prevent decompression of + * a file; this will only reduce the number of threads. + * + * If memlimit_threading is greater than memlimit_stop, then the value + * of memlimit_stop will be used for both. + */ + uint64_t memlimit_threading; + + /** + * \brief Memory usage limit that should never be exceeded + * + * Encoder: Ignored. + * + * Decoder: If decompressing will need more than this amount of + * memory even in the single-threaded mode, then lzma_code() will + * return LZMA_MEMLIMIT_ERROR. + */ + uint64_t memlimit_stop; + + uint64_t reserved_int7; + uint64_t reserved_int8; + void *reserved_ptr1; + void *reserved_ptr2; + void *reserved_ptr3; + void *reserved_ptr4; + +} lzma_mt; + + +/** + * \brief Calculate approximate memory usage of easy encoder + * + * This function is a wrapper for lzma_raw_encoder_memusage(). + * + * \param preset Compression preset (level and possible flags) + * + * \return Number of bytes of memory required for the given + * preset when encoding. If an error occurs, for example + * due to unsupported preset, UINT64_MAX is returned. + */ +extern LZMA_API(uint64_t) lzma_easy_encoder_memusage(uint32_t preset) + lzma_nothrow lzma_attr_pure; + + +/** + * \brief Calculate approximate decoder memory usage of a preset + * + * This function is a wrapper for lzma_raw_decoder_memusage(). + * + * \param preset Compression preset (level and possible flags) + * + * \return Number of bytes of memory required to decompress a file + * that was compressed using the given preset. If an error + * occurs, for example due to unsupported preset, UINT64_MAX + * is returned. + */ +extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset) + lzma_nothrow lzma_attr_pure; + + +/** + * \brief Initialize .xz Stream encoder using a preset number + * + * This function is intended for those who just want to use the basic features + * if liblzma (that is, most developers out there). + * + * \param strm Pointer to lzma_stream that is at least initialized + * with LZMA_STREAM_INIT. + * \param preset Compression preset to use. A preset consist of level + * number and zero or more flags. Usually flags aren't + * used, so preset is simply a number [0, 9] which match + * the options -0 ... -9 of the xz command line tool. + * Additional flags can be be set using bitwise-or with + * the preset level number, e.g. 6 | LZMA_PRESET_EXTREME. + * \param check Integrity check type to use. See check.h for available + * checks. The xz command line tool defaults to + * LZMA_CHECK_CRC64, which is a good choice if you are + * unsure. LZMA_CHECK_CRC32 is good too as long as the + * uncompressed file is not many gigabytes. + * + * \return - LZMA_OK: Initialization succeeded. Use lzma_code() to + * encode your data. + * - LZMA_MEM_ERROR: Memory allocation failed. + * - LZMA_OPTIONS_ERROR: The given compression preset is not + * supported by this build of liblzma. + * - LZMA_UNSUPPORTED_CHECK: The given check type is not + * supported by this liblzma build. + * - LZMA_PROG_ERROR: One or more of the parameters have values + * that will never be valid. For example, strm == NULL. + * + * If initialization fails (return value is not LZMA_OK), all the memory + * allocated for *strm by liblzma is always freed. Thus, there is no need + * to call lzma_end() after failed initialization. + * + * If initialization succeeds, use lzma_code() to do the actual encoding. + * Valid values for `action' (the second argument of lzma_code()) are + * LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future, + * there may be compression levels or flags that don't support LZMA_SYNC_FLUSH. + */ +extern LZMA_API(lzma_ret) lzma_easy_encoder( + lzma_stream *strm, uint32_t preset, lzma_check check) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Single-call .xz Stream encoding using a preset number + * + * The maximum required output buffer size can be calculated with + * lzma_stream_buffer_bound(). + * + * \param preset Compression preset to use. See the description + * in lzma_easy_encoder(). + * \param check Type of the integrity check to calculate from + * uncompressed data. + * \param allocator lzma_allocator for custom allocator functions. + * Set to NULL to use malloc() and free(). + * \param in Beginning of the input buffer + * \param in_size Size of the input buffer + * \param out Beginning of the output buffer + * \param out_pos The next byte will be written to out[*out_pos]. + * *out_pos is updated only if encoding succeeds. + * \param out_size Size of the out buffer; the first byte into + * which no data is written to is out[out_size]. + * + * \return - LZMA_OK: Encoding was successful. + * - LZMA_BUF_ERROR: Not enough output buffer space. + * - LZMA_UNSUPPORTED_CHECK + * - LZMA_OPTIONS_ERROR + * - LZMA_MEM_ERROR + * - LZMA_DATA_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_easy_buffer_encode( + uint32_t preset, lzma_check check, + const lzma_allocator *allocator, + const uint8_t *in, size_t in_size, + uint8_t *out, size_t *out_pos, size_t out_size) lzma_nothrow; + + +/** + * \brief Initialize .xz Stream encoder using a custom filter chain + * + * \param strm Pointer to properly prepared lzma_stream + * \param filters Array of filters. This must be terminated with + * filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for + * more information. + * \param check Type of the integrity check to calculate from + * uncompressed data. + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR + * - LZMA_UNSUPPORTED_CHECK + * - LZMA_OPTIONS_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_encoder(lzma_stream *strm, + const lzma_filter *filters, lzma_check check) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Calculate approximate memory usage of multithreaded .xz encoder + * + * Since doing the encoding in threaded mode doesn't affect the memory + * requirements of single-threaded decompressor, you can use + * lzma_easy_decoder_memusage(options->preset) or + * lzma_raw_decoder_memusage(options->filters) to calculate + * the decompressor memory requirements. + * + * \param options Compression options + * + * \return Number of bytes of memory required for encoding with the + * given options. If an error occurs, for example due to + * unsupported preset or filter chain, UINT64_MAX is returned. + */ +extern LZMA_API(uint64_t) lzma_stream_encoder_mt_memusage( + const lzma_mt *options) lzma_nothrow lzma_attr_pure; + + +/** + * \brief Initialize multithreaded .xz Stream encoder + * + * This provides the functionality of lzma_easy_encoder() and + * lzma_stream_encoder() as a single function for multithreaded use. + * + * The supported actions for lzma_code() are LZMA_RUN, LZMA_FULL_FLUSH, + * LZMA_FULL_BARRIER, and LZMA_FINISH. Support for LZMA_SYNC_FLUSH might be + * added in the future. + * + * \param strm Pointer to properly prepared lzma_stream + * \param options Pointer to multithreaded compression options + * + * \return - LZMA_OK + * - LZMA_MEM_ERROR + * - LZMA_UNSUPPORTED_CHECK + * - LZMA_OPTIONS_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_encoder_mt( + lzma_stream *strm, const lzma_mt *options) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Initialize .lzma encoder (legacy file format) + * + * The .lzma format is sometimes called the LZMA_Alone format, which is the + * reason for the name of this function. The .lzma format supports only the + * LZMA1 filter. There is no support for integrity checks like CRC32. + * + * Use this function if and only if you need to create files readable by + * legacy LZMA tools such as LZMA Utils 4.32.x. Moving to the .xz format + * is strongly recommended. + * + * The valid action values for lzma_code() are LZMA_RUN and LZMA_FINISH. + * No kind of flushing is supported, because the file format doesn't make + * it possible. + * + * \return - LZMA_OK + * - LZMA_MEM_ERROR + * - LZMA_OPTIONS_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_alone_encoder( + lzma_stream *strm, const lzma_options_lzma *options) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Calculate output buffer size for single-call Stream encoder + * + * When trying to compress uncompressible data, the encoded size will be + * slightly bigger than the input data. This function calculates how much + * output buffer space is required to be sure that lzma_stream_buffer_encode() + * doesn't return LZMA_BUF_ERROR. + * + * The calculated value is not exact, but it is guaranteed to be big enough. + * The actual maximum output space required may be slightly smaller (up to + * about 100 bytes). This should not be a problem in practice. + * + * If the calculated maximum size doesn't fit into size_t or would make the + * Stream grow past LZMA_VLI_MAX (which should never happen in practice), + * zero is returned to indicate the error. + * + * \note The limit calculated by this function applies only to + * single-call encoding. Multi-call encoding may (and probably + * will) have larger maximum expansion when encoding + * uncompressible data. Currently there is no function to + * calculate the maximum expansion of multi-call encoding. + */ +extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size) + lzma_nothrow; + + +/** + * \brief Single-call .xz Stream encoder + * + * \param filters Array of filters. This must be terminated with + * filters[n].id = LZMA_VLI_UNKNOWN. See filter.h + * for more information. + * \param check Type of the integrity check to calculate from + * uncompressed data. + * \param allocator lzma_allocator for custom allocator functions. + * Set to NULL to use malloc() and free(). + * \param in Beginning of the input buffer + * \param in_size Size of the input buffer + * \param out Beginning of the output buffer + * \param out_pos The next byte will be written to out[*out_pos]. + * *out_pos is updated only if encoding succeeds. + * \param out_size Size of the out buffer; the first byte into + * which no data is written to is out[out_size]. + * + * \return - LZMA_OK: Encoding was successful. + * - LZMA_BUF_ERROR: Not enough output buffer space. + * - LZMA_UNSUPPORTED_CHECK + * - LZMA_OPTIONS_ERROR + * - LZMA_MEM_ERROR + * - LZMA_DATA_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_buffer_encode( + lzma_filter *filters, lzma_check check, + const lzma_allocator *allocator, + const uint8_t *in, size_t in_size, + uint8_t *out, size_t *out_pos, size_t out_size) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief MicroLZMA encoder + * + * The MicroLZMA format is a raw LZMA stream whose first byte (always 0x00) + * has been replaced with bitwise-negation of the LZMA properties (lc/lp/pb). + * This encoding ensures that the first byte of MicroLZMA stream is never + * 0x00. There is no end of payload marker and thus the uncompressed size + * must be stored separately. For the best error detection the dictionary + * size should be stored separately as well but alternatively one may use + * the uncompressed size as the dictionary size when decoding. + * + * With the MicroLZMA encoder, lzma_code() behaves slightly unusually. + * The action argument must be LZMA_FINISH and the return value will never be + * LZMA_OK. Thus the encoding is always done with a single lzma_code() after + * the initialization. The benefit of the combination of initialization + * function and lzma_code() is that memory allocations can be re-used for + * better performance. + * + * lzma_code() will try to encode as much input as is possible to fit into + * the given output buffer. If not all input can be encoded, the stream will + * be finished without encoding all the input. The caller must check both + * input and output buffer usage after lzma_code() (total_in and total_out + * in lzma_stream can be convenient). Often lzma_code() can fill the output + * buffer completely if there is a lot of input, but sometimes a few bytes + * may remain unused because the next LZMA symbol would require more space. + * + * lzma_stream.avail_out must be at least 6. Otherwise LZMA_PROG_ERROR + * will be returned. + * + * The LZMA dictionary should be reasonably low to speed up the encoder + * re-initialization. A good value is bigger than the resulting + * uncompressed size of most of the output chunks. For example, if output + * size is 4 KiB, dictionary size of 32 KiB or 64 KiB is good. If the + * data compresses extremely well, even 128 KiB may be useful. + * + * The MicroLZMA format and this encoder variant were made with the EROFS + * file system in mind. This format may be convenient in other embedded + * uses too where many small streams are needed. XZ Embedded includes a + * decoder for this format. + * + * \return - LZMA_STREAM_END: All good. Check the amounts of input used + * and output produced. Store the amount of input used + * (uncompressed size) as it needs to be known to decompress + * the data. + * - LZMA_OPTIONS_ERROR + * - LZMA_MEM_ERROR + * - LZMA_PROG_ERROR: In addition to the generic reasons for this + * error code, this may also be returned if there isn't enough + * output space (6 bytes) to create a valid MicroLZMA stream. + */ +extern LZMA_API(lzma_ret) lzma_microlzma_encoder( + lzma_stream *strm, const lzma_options_lzma *options); + + +/************ + * Decoding * + ************/ + +/** + * This flag makes lzma_code() return LZMA_NO_CHECK if the input stream + * being decoded has no integrity check. Note that when used with + * lzma_auto_decoder(), all .lzma files will trigger LZMA_NO_CHECK + * if LZMA_TELL_NO_CHECK is used. + */ +#define LZMA_TELL_NO_CHECK UINT32_C(0x01) + + +/** + * This flag makes lzma_code() return LZMA_UNSUPPORTED_CHECK if the input + * stream has an integrity check, but the type of the integrity check is not + * supported by this liblzma version or build. Such files can still be + * decoded, but the integrity check cannot be verified. + */ +#define LZMA_TELL_UNSUPPORTED_CHECK UINT32_C(0x02) + + +/** + * This flag makes lzma_code() return LZMA_GET_CHECK as soon as the type + * of the integrity check is known. The type can then be got with + * lzma_get_check(). + */ +#define LZMA_TELL_ANY_CHECK UINT32_C(0x04) + + +/** + * This flag makes lzma_code() not calculate and verify the integrity check + * of the compressed data in .xz files. This means that invalid integrity + * check values won't be detected and LZMA_DATA_ERROR won't be returned in + * such cases. + * + * This flag only affects the checks of the compressed data itself; the CRC32 + * values in the .xz headers will still be verified normally. + * + * Don't use this flag unless you know what you are doing. Possible reasons + * to use this flag: + * + * - Trying to recover data from a corrupt .xz file. + * + * - Speeding up decompression, which matters mostly with SHA-256 + * or with files that have compressed extremely well. It's recommended + * to not use this flag for this purpose unless the file integrity is + * verified externally in some other way. + * + * Support for this flag was added in liblzma 5.1.4beta. + */ +#define LZMA_IGNORE_CHECK UINT32_C(0x10) + + +/** + * This flag enables decoding of concatenated files with file formats that + * allow concatenating compressed files as is. From the formats currently + * supported by liblzma, only the .xz and .lz formats allow concatenated + * files. Concatenated files are not allowed with the legacy .lzma format. + * + * This flag also affects the usage of the `action' argument for lzma_code(). + * When LZMA_CONCATENATED is used, lzma_code() won't return LZMA_STREAM_END + * unless LZMA_FINISH is used as `action'. Thus, the application has to set + * LZMA_FINISH in the same way as it does when encoding. + * + * If LZMA_CONCATENATED is not used, the decoders still accept LZMA_FINISH + * as `action' for lzma_code(), but the usage of LZMA_FINISH isn't required. + */ +#define LZMA_CONCATENATED UINT32_C(0x08) + + +/** + * This flag makes the threaded decoder report errors (like LZMA_DATA_ERROR) + * as soon as they are detected. This saves time when the application has no + * interest in a partially decompressed truncated or corrupt file. Note that + * due to timing randomness, if the same truncated or corrupt input is + * decompressed multiple times with this flag, a different amount of output + * may be produced by different runs, and even the error code might vary. + * + * When using LZMA_FAIL_FAST, it is recommended to use LZMA_FINISH to tell + * the decoder when no more input will be coming because it can help fast + * detection and reporting of truncated files. Note that in this situation + * truncated files might be diagnosed with LZMA_DATA_ERROR instead of + * LZMA_OK or LZMA_BUF_ERROR! + * + * Without this flag the threaded decoder will provide as much output as + * possible at first and then report the pending error. This default behavior + * matches the single-threaded decoder and provides repeatable behavior + * with truncated or corrupt input. There are a few special cases where the + * behavior can still differ like memory allocation failures (LZMA_MEM_ERROR). + * + * Single-threaded decoders currently ignore this flag. + * + * Support for this flag was added in liblzma 5.3.3alpha. Note that in older + * versions this flag isn't supported (LZMA_OPTIONS_ERROR) even by functions + * that ignore this flag in newer liblzma versions. + */ +#define LZMA_FAIL_FAST UINT32_C(0x20) + + +/** + * \brief Initialize .xz Stream decoder + * + * \param strm Pointer to properly prepared lzma_stream + * \param memlimit Memory usage limit as bytes. Use UINT64_MAX + * to effectively disable the limiter. liblzma + * 5.2.3 and earlier don't allow 0 here and return + * LZMA_PROG_ERROR; later versions treat 0 as if 1 + * had been specified. + * \param flags Bitwise-or of zero or more of the decoder flags: + * LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK, + * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, + * LZMA_CONCATENATED, LZMA_FAIL_FAST + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + * - LZMA_OPTIONS_ERROR: Unsupported flags + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_decoder( + lzma_stream *strm, uint64_t memlimit, uint32_t flags) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Initialize multithreaded .xz Stream decoder + * + * \param strm Pointer to properly prepared lzma_stream + * \param options Pointer to multithreaded compression options + * + * The decoder can decode multiple Blocks in parallel. This requires that each + * Block Header contains the Compressed Size and Uncompressed size fields + * which are added by the multi-threaded encoder, see lzma_stream_encoder_mt(). + * + * A Stream with one Block will only utilize one thread. A Stream with multiple + * Blocks but without size information in Block Headers will be processed in + * single-threaded mode in the same way as done by lzma_stream_decoder(). + * Concatenated Streams are processed one Stream at a time; no inter-Stream + * parallelization is done. + * + * This function behaves like lzma_stream_decoder() when options->threads == 1 + * and options->memlimit_threading <= 1. + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + * - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached. + * - LZMA_OPTIONS_ERROR: Unsupported flags. + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_decoder_mt( + lzma_stream *strm, const lzma_mt *options) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Decode .xz, .lzma, and .lz (lzip) files with autodetection + * + * This decoder autodetects between the .xz, .lzma, and .lz file formats, + * and calls lzma_stream_decoder(), lzma_alone_decoder(), or + * lzma_lzip_decoder() once the type of the input file has been detected. + * + * Support for .lz was added in 5.4.0. + * + * If the flag LZMA_CONCATENATED is used and the input is a .lzma file: + * For historical reasons concatenated .lzma files aren't supported. + * If there is trailing data after one .lzma stream, lzma_code() will + * return LZMA_DATA_ERROR. (lzma_alone_decoder() doesn't have such a check + * as it doesn't support any decoder flags. It will return LZMA_STREAM_END + * after one .lzma stream.) + * + * \param strm Pointer to properly prepared lzma_stream + * \param memlimit Memory usage limit as bytes. Use UINT64_MAX + * to effectively disable the limiter. liblzma + * 5.2.3 and earlier don't allow 0 here and return + * LZMA_PROG_ERROR; later versions treat 0 as if 1 + * had been specified. + * \param flags Bitwise-or of zero or more of the decoder flags: + * LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK, + * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, + * LZMA_CONCATENATED, LZMA_FAIL_FAST + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + * - LZMA_OPTIONS_ERROR: Unsupported flags + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_auto_decoder( + lzma_stream *strm, uint64_t memlimit, uint32_t flags) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Initialize .lzma decoder (legacy file format) + * + * \param strm Pointer to properly prepared lzma_stream + * \param memlimit Memory usage limit as bytes. Use UINT64_MAX + * to effectively disable the limiter. liblzma + * 5.2.3 and earlier don't allow 0 here and return + * LZMA_PROG_ERROR; later versions treat 0 as if 1 + * had been specified. + * + * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH. + * There is no need to use LZMA_FINISH, but it's allowed because it may + * simplify certain types of applications. + * + * \return - LZMA_OK + * - LZMA_MEM_ERROR + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_alone_decoder( + lzma_stream *strm, uint64_t memlimit) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Initialize .lz (lzip) decoder (a foreign file format) + * + * \param strm Pointer to properly prepared lzma_stream + * \param memlimit Memory usage limit as bytes. Use UINT64_MAX + * to effectively disable the limiter. + * \param flags Bitwise-or of flags, or zero for no flags. + * All decoder flags listed above are supported + * although only LZMA_CONCATENATED and (in very rare + * cases) LZMA_IGNORE_CHECK are actually useful. + * LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK, + * and LZMA_FAIL_FAST do nothing. LZMA_TELL_ANY_CHECK + * is supported for consistency only as CRC32 is + * always used in the .lz format. + * + * This decoder supports the .lz format version 0 and the unextended .lz + * format version 1: + * + * - Files in the format version 0 were produced by lzip 1.3 and older. + * Such files aren't common but may be found from file archives + * as a few source packages were released in this format. People + * might have old personal files in this format too. Decompression + * support for the format version 0 was removed in lzip 1.18. + * + * - lzip 1.3 added decompression support for .lz format version 1 files. + * Compression support was added in lzip 1.4. In lzip 1.6 the .lz format + * version 1 was extended to support the Sync Flush marker. This extension + * is not supported by liblzma. lzma_code() will return LZMA_DATA_ERROR + * at the location of the Sync Flush marker. In practice files with + * the Sync Flush marker are very rare and thus liblzma can decompress + * almost all .lz files. + * + * Just like with lzma_stream_decoder() for .xz files, LZMA_CONCATENATED + * should be used when decompressing normal standalone .lz files. + * + * The .lz format allows putting non-.lz data at the end of a file after at + * least one valid .lz member. That is, one can append custom data at the end + * of a .lz file and the decoder is required to ignore it. In liblzma this + * is relevant only when LZMA_CONCATENATED is used. In that case lzma_code() + * will return LZMA_STREAM_END and leave lzma_stream.next_in pointing to + * the first byte of the non-.lz data. An exception to this is if the first + * 1-3 bytes of the non-.lz data are identical to the .lz magic bytes + * (0x4C, 0x5A, 0x49, 0x50; "LZIP" in US-ASCII). In such a case the 1-3 bytes + * will have been ignored by lzma_code(). If one wishes to locate the non-.lz + * data reliably, one must ensure that the first byte isn't 0x4C. Actually + * one should ensure that none of the first four bytes of trailing data are + * equal to the magic bytes because lzip >= 1.20 requires it by default. + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + * - LZMA_OPTIONS_ERROR: Unsupported flags + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_lzip_decoder( + lzma_stream *strm, uint64_t memlimit, uint32_t flags) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief Single-call .xz Stream decoder + * + * \param memlimit Pointer to how much memory the decoder is allowed + * to allocate. The value pointed by this pointer is + * modified if and only if LZMA_MEMLIMIT_ERROR is + * returned. + * \param flags Bitwise-or of zero or more of the decoder flags: + * LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK, + * LZMA_IGNORE_CHECK, LZMA_CONCATENATED, + * LZMA_FAIL_FAST. Note that LZMA_TELL_ANY_CHECK + * is not allowed and will return LZMA_PROG_ERROR. + * \param allocator lzma_allocator for custom allocator functions. + * Set to NULL to use malloc() and free(). + * \param in Beginning of the input buffer + * \param in_pos The next byte will be read from in[*in_pos]. + * *in_pos is updated only if decoding succeeds. + * \param in_size Size of the input buffer; the first byte that + * won't be read is in[in_size]. + * \param out Beginning of the output buffer + * \param out_pos The next byte will be written to out[*out_pos]. + * *out_pos is updated only if decoding succeeds. + * \param out_size Size of the out buffer; the first byte into + * which no data is written to is out[out_size]. + * + * \return - LZMA_OK: Decoding was successful. + * - LZMA_FORMAT_ERROR + * - LZMA_OPTIONS_ERROR + * - LZMA_DATA_ERROR + * - LZMA_NO_CHECK: This can be returned only if using + * the LZMA_TELL_NO_CHECK flag. + * - LZMA_UNSUPPORTED_CHECK: This can be returned only if using + * the LZMA_TELL_UNSUPPORTED_CHECK flag. + * - LZMA_MEM_ERROR + * - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached. + * The minimum required memlimit value was stored to *memlimit. + * - LZMA_BUF_ERROR: Output buffer was too small. + * - LZMA_PROG_ERROR + */ +extern LZMA_API(lzma_ret) lzma_stream_buffer_decode( + uint64_t *memlimit, uint32_t flags, + const lzma_allocator *allocator, + const uint8_t *in, size_t *in_pos, size_t in_size, + uint8_t *out, size_t *out_pos, size_t out_size) + lzma_nothrow lzma_attr_warn_unused_result; + + +/** + * \brief MicroLZMA decoder + * + * See lzma_microlzma_decoder() for more information. + * + * The lzma_code() usage with this decoder is completely normal. The + * special behavior of lzma_code() applies to lzma_microlzma_encoder() only. + * + * \param strm Pointer to properly prepared lzma_stream + * \param comp_size Compressed size of the MicroLZMA stream. + * The caller must somehow know this exactly. + * \param uncomp_size Uncompressed size of the MicroLZMA stream. + * If the exact uncompressed size isn't known, this + * can be set to a value that is at most as big as + * the exact uncompressed size would be, but then the + * next argument uncomp_size_is_exact must be false. + * \param uncomp_size_is_exact + * If true, uncomp_size must be exactly correct. + * This will improve error detection at the end of + * the stream. If the exact uncompressed size isn't + * known, this must be false. uncomp_size must still + * be at most as big as the exact uncompressed size + * is. Setting this to false when the exact size is + * known will work but error detection at the end of + * the stream will be weaker. + * \param dict_size LZMA dictionary size that was used when + * compressing the data. It is OK to use a bigger + * value too but liblzma will then allocate more + * memory than would actually be required and error + * detection will be slightly worse. (Note that with + * the implementation in XZ Embedded it doesn't + * affect the memory usage if one specifies bigger + * dictionary than actually required.) + */ +extern LZMA_API(lzma_ret) lzma_microlzma_decoder( + lzma_stream *strm, uint64_t comp_size, + uint64_t uncomp_size, lzma_bool uncomp_size_is_exact, + uint32_t dict_size); |