| /** |
| * \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 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) |
| */ |
| 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) |
| */ |
| 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_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, |
| 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_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 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_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, |
| 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; |
| |
| |
| /************ |
| * 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 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 format allows 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) |
| |
| |
| /** |
| * \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. |
| * \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_CONCATENATED |
| * |
| * \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 Decode .xz Streams and .lzma files with autodetection |
| * |
| * This decoder autodetects between the .xz and .lzma file formats, and |
| * calls lzma_stream_decoder() or lzma_alone_decoder() once the type |
| * of the input file has been detected. |
| * |
| * \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. |
| * |
| * \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) |
| * |
| * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH. |
| * There is no need to use LZMA_FINISH, but allowing 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 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_CONCATENATED. 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, 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; |
