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- /**
- * \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.
- *
- * No flags are currently supported.
- */
- uint32_t flags;
- /**
- * \brief Number of worker threads to use
- */
- uint32_t threads;
- /**
- * \brief 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 Compression preset (level and possible flags)
- *
- * The preset is set just like with lzma_easy_encoder().
- * The preset is ignored if filters below is non-NULL.
- */
- uint32_t preset;
- /**
- * \brief 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 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;
- uint64_t reserved_int5;
- uint64_t reserved_int6;
- 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;
- /************
- * 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 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. 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_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. 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 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)
- *
- * \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 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,
- 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;
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