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| -rw-r--r-- | src/liblzma/api/lzma/container.h | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/src/liblzma/api/lzma/container.h b/src/liblzma/api/lzma/container.h new file mode 100644 index 00000000..27014856 --- /dev/null +++ b/src/liblzma/api/lzma/container.h @@ -0,0 +1,252 @@ +/** + * \file lzma/FIXME.h + * \brief File formats + * + * \author Copyright (C) 1999-2008 Igor Pavlov + * \author Copyright (C) 2007-2008 Lasse Collin + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + */ + +#ifndef LZMA_H_INTERNAL +# error Never include this file directly. Use <lzma.h> instead. +#endif + + +/************ + * Encoding * + ************/ + +/** + * \brief Compression level names for lzma_easy_* functions + * + * At the moment, all the compression levels support LZMA_SYNC_FLUSH. + * In future there may be levels that don't support LZMA_SYNC_FLUSH. + * However, the LZMA_SYNC_FLUSH support won't be removed from the + * existing compression levels. + * + * \note If liblzma is built without encoder support, or with some + * filters disabled, some of the compression levels may be + * unsupported. In that case, the initialization functions + * will return LZMA_HEADER_ERROR. + */ +typedef enum { + LZMA_EASY_COPY = 0, + /**< + * No compression; the data is just wrapped into .lzma + * container. + */ + + LZMA_EASY_LZMA2_1 = 1, + /**< + * LZMA2 filter with fast compression (fast in terms of LZMA2). + * If you are interested in the exact options used, see + * lzma_preset_lzma[0]. Note that the exact options may + * change between liblzma versions. + * + * At the moment, the command line tool uses these settings + * when `lzma -1' is used. In future, the command line tool + * may default to some more complex way to determine the + * settings used e.g. the type of files being compressed. + * + * LZMA_EASY_LZMA_2 is equivalent to lzma_preset_lzma[1] + * and so on. + */ + + LZMA_EASY_LZMA_2 = 2, + LZMA_EASY_LZMA_3 = 3, + LZMA_EASY_LZMA_4 = 4, + LZMA_EASY_LZMA_5 = 5, + LZMA_EASY_LZMA_6 = 6, + LZMA_EASY_LZMA_7 = 7, + LZMA_EASY_LZMA_8 = 8, + LZMA_EASY_LZMA_9 = 9, +} lzma_easy_level; + + +/** + * \brief Default compression level + * + * Data Blocks contain the actual compressed data. It's not straightforward + * to recommend a default level, because in some cases keeping the resource + * usage relatively low is more important that getting the maximum + * compression ratio. + */ +#define LZMA_EASY_DEFAULT LZMA_EASY_LZMA2_7 + + +/** + * \brief Calculates rough memory requirements of a compression level + * + * This function is a wrapper for lzma_memory_usage(), which is declared + * in filter.h. + * + * \return Approximate memory usage of the encoder with the given + * compression level in mebibytes (value * 1024 * 1024 bytes). + * On error (e.g. compression level is not supported), + * UINT32_MAX is returned. + */ +extern uint32_t lzma_easy_memory_usage(lzma_easy_level level) + lzma_attr_pure; + + +/** + * \brief Initializes .lzma Stream encoder + * + * This function is intended for those who just want to use the basic features + * if liblzma (that is, most developers out there). Lots of assumptions are + * made, which are correct or at least good enough for most situations. + * + * \param strm Pointer to lzma_stream that is at least initialized + * with LZMA_STREAM_INIT. + * \param level Compression level to use. This selects a set of + * compression settings from a list of compression + * presets. + * + * \return - LZMA_OK: Initialization succeeded. Use lzma_code() to + * encode your data. + * - LZMA_MEM_ERROR: Memory allocation failed. All memory + * previously allocated for *strm is now freed. + * - LZMA_HEADER_ERROR: The given compression level is not + * supported by this build of liblzma. + * + * 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 that don't support LZMA_SYNC_FLUSH. + */ +extern lzma_ret lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level) + lzma_attr_warn_unused_result; + + +/** + * \brief Initializes .lzma Stream encoder + * + * \param strm Pointer to properly prepared lzma_stream + * \param filters Array of filters. This must be terminated with + * filters[n].id = LZMA_VLI_VALUE_UNKNOWN. There must + * be 1-4 filters, but there are restrictions on how + * multiple filters can be combined. FIXME Tell where + * to find more information. + * \param check Type of the integrity check to calculate from + * uncompressed data. + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR + * - LZMA_HEADER_ERROR + * - LZMA_PROG_ERROR + */ +extern lzma_ret lzma_stream_encoder(lzma_stream *strm, + const lzma_filter *filters, lzma_check check) + lzma_attr_warn_unused_result; + + +/** + * \brief Initializes LZMA_Alone (deprecated file format) encoder + * + * LZMA_Alone files have the suffix .lzma like the .lzma Stream files. + * LZMA_Alone format supports only one filter, the LZMA filter. There is + * no support for integrity checks like CRC32. + * + * Use this format if and only if you need to create files readable by + * legacy LZMA tools such as LZMA Utils 4.32.x. + * + * LZMA_Alone encoder doesn't support LZMA_SYNC_FLUSH or LZMA_FULL_FLUSH. + * + * \return - LZMA_OK + * - LZMA_MEM_ERROR + * - LZMA_PROG_ERROR + */ +extern lzma_ret lzma_alone_encoder( + lzma_stream *strm, const lzma_options_lzma *options) + lzma_attr_warn_unused_result; + + +/************ + * 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_Alone files will cause trigger LZMA_NO_CHECK + * if LZMA_WARN_NO_CHECK is used. + */ +#define LZMA_WARN_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_WARN_UNSUPPORTED_CHECK UINT32_C(0x02) + + +/** + * This flag makes lzma_code() return LZMA_READ_CHECK as soon as the type + * of the integrity check is known. The type can then be read with + * lzma_check_get(). + */ +#define LZMA_TELL_CHECK UINT32_C(0x04) + + +/** + * This flag makes lzma_code() decode concatenated .lzma files. + * FIXME Explain the changed API. + */ +#define LZMA_CONCATENATED UINT32_C(0x08) + + +/** + * \brief Initializes decoder for .lzma Stream + * + * \param strm Pointer to propertily prepared lzma_stream + * \param memlimit Rough memory usage limit as bytes + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + */ +extern lzma_ret lzma_stream_decoder( + lzma_stream *strm, uint64_t memlimit, uint32_t flags) + lzma_attr_warn_unused_result; + + +/** + * \brief Decode .lzma Streams and LZMA_Alone files with autodetection + * + * Autodetects between the .lzma Stream and LZMA_Alone formats, and + * calls lzma_stream_decoder_init() or lzma_alone_decoder_init() once + * the type of the file has been detected. + * + * \param strm Pointer to propertily prepared lzma_stream + * \param memlimit Rough memory usage limit as bytes + * \param flags Bitwise-or of flags, or zero for no flags. + * + * \return - LZMA_OK: Initialization was successful. + * - LZMA_MEM_ERROR: Cannot allocate memory. + */ +extern lzma_ret lzma_auto_decoder( + lzma_stream *strm, uint64_t memlimit, uint32_t flags) + lzma_attr_warn_unused_result; + + +/** + * \brief Initializes decoder for LZMA_Alone file + * + * The LZMA_Alone decoder supports LZMA_SYNC_FLUSH. FIXME + * + * \return - LZMA_OK + * - LZMA_MEM_ERROR + */ +extern lzma_ret lzma_alone_decoder(lzma_stream *strm, uint64_t memlimit) + lzma_attr_warn_unused_result; |