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425 lines
17 KiB
C
425 lines
17 KiB
C
/**
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* \file lzma/container.h
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* \brief File formats
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*/
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/*
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* Author: Lasse Collin
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*
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* See ../lzma.h for information about liblzma as a whole.
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*/
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#ifndef LZMA_H_INTERNAL
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# error Never include this file directly. Use <lzma.h> instead.
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#endif
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/************
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* Encoding *
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************/
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/**
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* \brief Default compression preset
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*
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* It's not straightforward to recommend a default preset, because in some
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* cases keeping the resource usage relatively low is more important that
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* getting the maximum compression ratio.
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*/
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#define LZMA_PRESET_DEFAULT UINT32_C(6)
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/**
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* \brief Mask for preset level
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*
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* This is useful only if you need to extract the level from the preset
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* variable. That should be rare.
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*/
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#define LZMA_PRESET_LEVEL_MASK UINT32_C(0x1F)
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/*
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* Preset flags
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*
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* Currently only one flag is defined.
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*/
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/**
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* \brief Extreme compression preset
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*
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* This flag modifies the preset to make the encoding significantly slower
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* while improving the compression ratio only marginally. This is useful
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* when you don't mind wasting time to get as small result as possible.
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*
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* This flag doesn't affect the memory usage requirements of the decoder (at
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* least not significantly). The memory usage of the encoder may be increased
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* a little but only at the lowest preset levels (0-3).
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*/
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#define LZMA_PRESET_EXTREME (UINT32_C(1) << 31)
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/**
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* \brief Calculate approximate memory usage of easy encoder
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*
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* This function is a wrapper for lzma_raw_encoder_memusage().
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*
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* \param preset Compression preset (level and possible flags)
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*
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* \return Number of bytes of memory required for the given
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* preset when encoding. If an error occurs, for example
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* due to unsupported preset, UINT64_MAX is returned.
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*/
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extern LZMA_API(uint64_t) lzma_easy_encoder_memusage(uint32_t preset)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Calculate approximate decoder memory usage of a preset
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*
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* This function is a wrapper for lzma_raw_decoder_memusage().
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*
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* \param preset Compression preset (level and possible flags)
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*
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* \return Number of bytes of memory required to decompress a file
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* that was compressed using the given preset. If an error
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* occurs, for example due to unsupported preset, UINT64_MAX
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* is returned.
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*/
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extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Initialize .xz Stream encoder using a preset number
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*
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* This function is intended for those who just want to use the basic features
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* if liblzma (that is, most developers out there).
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*
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* \param strm Pointer to lzma_stream that is at least initialized
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* with LZMA_STREAM_INIT.
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* \param preset Compression preset to use. A preset consist of level
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* number and zero or more flags. Usually flags aren't
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* used, so preset is simply a number [0, 9] which match
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* the options -0 ... -9 of the xz command line tool.
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* Additional flags can be be set using bitwise-or with
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* the preset level number, e.g. 6 | LZMA_PRESET_EXTREME.
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* \param check Integrity check type to use. See check.h for available
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* checks. The xz command line tool defaults to
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* LZMA_CHECK_CRC64, which is a good choice if you are
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* unsure. LZMA_CHECK_CRC32 is good too as long as the
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* uncompressed file is not many gigabytes.
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*
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* \return - LZMA_OK: Initialization succeeded. Use lzma_code() to
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* encode your data.
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* - LZMA_MEM_ERROR: Memory allocation failed.
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* - LZMA_OPTIONS_ERROR: The given compression preset is not
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* supported by this build of liblzma.
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* - LZMA_UNSUPPORTED_CHECK: The given check type is not
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* supported by this liblzma build.
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* - LZMA_PROG_ERROR: One or more of the parameters have values
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* that will never be valid. For example, strm == NULL.
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*
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* If initialization fails (return value is not LZMA_OK), all the memory
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* allocated for *strm by liblzma is always freed. Thus, there is no need
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* to call lzma_end() after failed initialization.
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*
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* If initialization succeeds, use lzma_code() to do the actual encoding.
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* Valid values for `action' (the second argument of lzma_code()) are
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* LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future,
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* there may be compression levels or flags that don't support LZMA_SYNC_FLUSH.
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*/
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extern LZMA_API(lzma_ret) lzma_easy_encoder(
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lzma_stream *strm, uint32_t preset, lzma_check check)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Single-call .xz Stream encoding using a preset number
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*
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* The maximum required output buffer size can be calculated with
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* lzma_stream_buffer_bound().
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*
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* \param preset Compression preset to use. See the description
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* in lzma_easy_encoder().
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* \param check Type of the integrity check to calculate from
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* uncompressed data.
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* \param allocator lzma_allocator for custom allocator functions.
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* Set to NULL to use malloc() and free().
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* \param in Beginning of the input buffer
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* \param in_size Size of the input buffer
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* \param out Beginning of the output buffer
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* \param out_pos The next byte will be written to out[*out_pos].
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* *out_pos is updated only if encoding succeeds.
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* \param out_size Size of the out buffer; the first byte into
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* which no data is written to is out[out_size].
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*
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* \return - LZMA_OK: Encoding was successful.
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* - LZMA_BUF_ERROR: Not enough output buffer space.
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* - LZMA_UNSUPPORTED_CHECK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_MEM_ERROR
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* - LZMA_DATA_ERROR
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_easy_buffer_encode(
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uint32_t preset, lzma_check check,
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lzma_allocator *allocator, const uint8_t *in, size_t in_size,
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uint8_t *out, size_t *out_pos, size_t out_size) lzma_nothrow;
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/**
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* \brief Initialize .xz Stream encoder using a custom filter chain
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*
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* \param strm Pointer to properly prepared lzma_stream
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* \param filters Array of filters. This must be terminated with
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* filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for
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* more information.
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* \param check Type of the integrity check to calculate from
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* uncompressed data.
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*
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* \return - LZMA_OK: Initialization was successful.
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* - LZMA_MEM_ERROR
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* - LZMA_UNSUPPORTED_CHECK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_stream_encoder(lzma_stream *strm,
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const lzma_filter *filters, lzma_check check)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Initialize .lzma encoder (legacy file format)
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*
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* The .lzma format is sometimes called the LZMA_Alone format, which is the
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* reason for the name of this function. The .lzma format supports only the
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* LZMA1 filter. There is no support for integrity checks like CRC32.
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*
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* Use this function if and only if you need to create files readable by
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* legacy LZMA tools such as LZMA Utils 4.32.x. Moving to the .xz format
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* is strongly recommended.
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*
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* The valid action values for lzma_code() are LZMA_RUN and LZMA_FINISH.
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* No kind of flushing is supported, because the file format doesn't make
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* it possible.
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*
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* \return - LZMA_OK
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* - LZMA_MEM_ERROR
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* - LZMA_OPTIONS_ERROR
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_alone_encoder(
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lzma_stream *strm, const lzma_options_lzma *options)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Calculate output buffer size for single-call Stream encoder
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*
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* When trying to compress uncompressible data, the encoded size will be
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* slightly bigger than the input data. This function calculates how much
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* output buffer space is required to be sure that lzma_stream_buffer_encode()
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* doesn't return LZMA_BUF_ERROR.
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*
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* The calculated value is not exact, but it is guaranteed to be big enough.
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* The actual maximum output space required may be slightly smaller (up to
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* about 100 bytes). This should not be a problem in practice.
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*
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* If the calculated maximum size doesn't fit into size_t or would make the
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* Stream grow past LZMA_VLI_MAX (which should never happen in practice),
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* zero is returned to indicate the error.
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*
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* \note The limit calculated by this function applies only to
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* single-call encoding. Multi-call encoding may (and probably
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* will) have larger maximum expansion when encoding
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* uncompressible data. Currently there is no function to
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* calculate the maximum expansion of multi-call encoding.
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*/
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extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size)
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lzma_nothrow;
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/**
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* \brief Single-call .xz Stream encoder
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*
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* \param filters Array of filters. This must be terminated with
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* filters[n].id = LZMA_VLI_UNKNOWN. See filter.h
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* for more information.
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* \param check Type of the integrity check to calculate from
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* uncompressed data.
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* \param allocator lzma_allocator for custom allocator functions.
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* Set to NULL to use malloc() and free().
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* \param in Beginning of the input buffer
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* \param in_size Size of the input buffer
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* \param out Beginning of the output buffer
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* \param out_pos The next byte will be written to out[*out_pos].
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* *out_pos is updated only if encoding succeeds.
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* \param out_size Size of the out buffer; the first byte into
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* which no data is written to is out[out_size].
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*
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* \return - LZMA_OK: Encoding was successful.
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* - LZMA_BUF_ERROR: Not enough output buffer space.
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* - LZMA_UNSUPPORTED_CHECK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_MEM_ERROR
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* - LZMA_DATA_ERROR
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
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lzma_filter *filters, lzma_check check,
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lzma_allocator *allocator, const uint8_t *in, size_t in_size,
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uint8_t *out, size_t *out_pos, size_t out_size)
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lzma_nothrow lzma_attr_warn_unused_result;
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/************
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* Decoding *
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************/
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/**
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* This flag makes lzma_code() return LZMA_NO_CHECK if the input stream
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* being decoded has no integrity check. Note that when used with
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* lzma_auto_decoder(), all .lzma files will trigger LZMA_NO_CHECK
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* if LZMA_TELL_NO_CHECK is used.
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*/
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#define LZMA_TELL_NO_CHECK UINT32_C(0x01)
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/**
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* This flag makes lzma_code() return LZMA_UNSUPPORTED_CHECK if the input
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* stream has an integrity check, but the type of the integrity check is not
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* supported by this liblzma version or build. Such files can still be
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* decoded, but the integrity check cannot be verified.
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*/
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#define LZMA_TELL_UNSUPPORTED_CHECK UINT32_C(0x02)
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/**
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* This flag makes lzma_code() return LZMA_GET_CHECK as soon as the type
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* of the integrity check is known. The type can then be got with
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* lzma_get_check().
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*/
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#define LZMA_TELL_ANY_CHECK UINT32_C(0x04)
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/**
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* This flag enables decoding of concatenated files with file formats that
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* allow concatenating compressed files as is. From the formats currently
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* supported by liblzma, only the .xz format allows concatenated files.
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* Concatenated files are not allowed with the legacy .lzma format.
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*
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* This flag also affects the usage of the `action' argument for lzma_code().
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* When LZMA_CONCATENATED is used, lzma_code() won't return LZMA_STREAM_END
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* unless LZMA_FINISH is used as `action'. Thus, the application has to set
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* LZMA_FINISH in the same way as it does when encoding.
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*
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* If LZMA_CONCATENATED is not used, the decoders still accept LZMA_FINISH
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* as `action' for lzma_code(), but the usage of LZMA_FINISH isn't required.
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*/
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#define LZMA_CONCATENATED UINT32_C(0x08)
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/**
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* \brief Initialize .xz Stream decoder
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*
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* \param strm Pointer to properly prepared lzma_stream
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* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
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* to effectively disable the limiter.
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* \param flags Bitwise-or of zero or more of the decoder flags:
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* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
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* LZMA_TELL_ANY_CHECK, LZMA_CONCATENATED
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*
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* \return - LZMA_OK: Initialization was successful.
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* - LZMA_MEM_ERROR: Cannot allocate memory.
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* - LZMA_OPTIONS_ERROR: Unsupported flags
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_stream_decoder(
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lzma_stream *strm, uint64_t memlimit, uint32_t flags)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Decode .xz Streams and .lzma files with autodetection
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*
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* This decoder autodetects between the .xz and .lzma file formats, and
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* calls lzma_stream_decoder() or lzma_alone_decoder() once the type
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* of the input file has been detected.
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*
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* \param strm Pointer to properly prepared lzma_stream
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* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
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* to effectively disable the limiter.
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* \param flags Bitwise-or of flags, or zero for no flags.
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*
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* \return - LZMA_OK: Initialization was successful.
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* - LZMA_MEM_ERROR: Cannot allocate memory.
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* - LZMA_OPTIONS_ERROR: Unsupported flags
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_auto_decoder(
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lzma_stream *strm, uint64_t memlimit, uint32_t flags)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Initialize .lzma decoder (legacy file format)
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*
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* Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
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* There is no need to use LZMA_FINISH, but allowing it may simplify
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* certain types of applications.
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*
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* \return - LZMA_OK
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* - LZMA_MEM_ERROR
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_alone_decoder(
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lzma_stream *strm, uint64_t memlimit)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Single-call .xz Stream decoder
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*
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* \param memlimit Pointer to how much memory the decoder is allowed
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* to allocate. The value pointed by this pointer is
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* modified if and only if LZMA_MEMLIMIT_ERROR is
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* returned.
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* \param flags Bitwise-or of zero or more of the decoder flags:
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* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
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* LZMA_CONCATENATED. Note that LZMA_TELL_ANY_CHECK
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* is not allowed and will return LZMA_PROG_ERROR.
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* \param allocator lzma_allocator for custom allocator functions.
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* Set to NULL to use malloc() and free().
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* \param in Beginning of the input buffer
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* \param in_pos The next byte will be read from in[*in_pos].
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* *in_pos is updated only if decoding succeeds.
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* \param in_size Size of the input buffer; the first byte that
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* won't be read is in[in_size].
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* \param out Beginning of the output buffer
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* \param out_pos The next byte will be written to out[*out_pos].
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* *out_pos is updated only if decoding succeeds.
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* \param out_size Size of the out buffer; the first byte into
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* which no data is written to is out[out_size].
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*
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* \return - LZMA_OK: Decoding was successful.
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* - LZMA_FORMAT_ERROR
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* - LZMA_OPTIONS_ERROR
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* - LZMA_DATA_ERROR
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* - LZMA_NO_CHECK: This can be returned only if using
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* the LZMA_TELL_NO_CHECK flag.
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* - LZMA_UNSUPPORTED_CHECK: This can be returned only if using
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* the LZMA_TELL_UNSUPPORTED_CHECK flag.
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* - LZMA_MEM_ERROR
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* - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached.
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* The minimum required memlimit value was stored to *memlimit.
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* - LZMA_BUF_ERROR: Output buffer was too small.
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
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uint64_t *memlimit, uint32_t flags, lzma_allocator *allocator,
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const uint8_t *in, size_t *in_pos, size_t in_size,
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uint8_t *out, size_t *out_pos, size_t out_size)
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lzma_nothrow lzma_attr_warn_unused_result;
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