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426 lines
16 KiB
C
426 lines
16 KiB
C
6 years ago
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/**
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* \file lzma/filter.h
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* \brief Common filter related types and functions
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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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* \brief Maximum number of filters in a chain
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*
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* A filter chain can have 1-4 filters, of which three are allowed to change
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* the size of the data. Usually only one or two filters are needed.
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*/
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#define LZMA_FILTERS_MAX 4
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/**
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* \brief Filter options
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*
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* This structure is used to pass Filter ID and a pointer filter's
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* options to liblzma. A few functions work with a single lzma_filter
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* structure, while most functions expect a filter chain.
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*
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* A filter chain is indicated with an array of lzma_filter structures.
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* The array is terminated with .id = LZMA_VLI_UNKNOWN. Thus, the filter
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* array must have LZMA_FILTERS_MAX + 1 elements (that is, five) to
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* be able to hold any arbitrary filter chain. This is important when
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* using lzma_block_header_decode() from block.h, because too small
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* array would make liblzma write past the end of the filters array.
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*/
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typedef struct {
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/**
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* \brief Filter ID
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*
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* Use constants whose name begin with `LZMA_FILTER_' to specify
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* different filters. In an array of lzma_filter structures, use
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* LZMA_VLI_UNKNOWN to indicate end of filters.
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*
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* \note This is not an enum, because on some systems enums
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* cannot be 64-bit.
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*/
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lzma_vli id;
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/**
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* \brief Pointer to filter-specific options structure
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*
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* If the filter doesn't need options, set this to NULL. If id is
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* set to LZMA_VLI_UNKNOWN, options is ignored, and thus
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* doesn't need be initialized.
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*/
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void *options;
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} lzma_filter;
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/**
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* \brief Test if the given Filter ID is supported for encoding
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*
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* Return true if the give Filter ID is supported for encoding by this
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* liblzma build. Otherwise false is returned.
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*
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* There is no way to list which filters are available in this particular
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* liblzma version and build. It would be useless, because the application
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* couldn't know what kind of options the filter would need.
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*/
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extern LZMA_API(lzma_bool) lzma_filter_encoder_is_supported(lzma_vli id)
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lzma_nothrow lzma_attr_const;
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/**
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* \brief Test if the given Filter ID is supported for decoding
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*
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* Return true if the give Filter ID is supported for decoding by this
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* liblzma build. Otherwise false is returned.
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*/
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extern LZMA_API(lzma_bool) lzma_filter_decoder_is_supported(lzma_vli id)
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lzma_nothrow lzma_attr_const;
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/**
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* \brief Copy the filters array
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*
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* Copy the Filter IDs and filter-specific options from src to dest.
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* Up to LZMA_FILTERS_MAX filters are copied, plus the terminating
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* .id == LZMA_VLI_UNKNOWN. Thus, dest should have at least
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* LZMA_FILTERS_MAX + 1 elements space unless the caller knows that
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* src is smaller than that.
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*
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* Unless the filter-specific options is NULL, the Filter ID has to be
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* supported by liblzma, because liblzma needs to know the size of every
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* filter-specific options structure. The filter-specific options are not
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* validated. If options is NULL, any unsupported Filter IDs are copied
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* without returning an error.
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*
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* Old filter-specific options in dest are not freed, so dest doesn't
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* need to be initialized by the caller in any way.
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*
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* If an error occurs, memory possibly already allocated by this function
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* is always freed.
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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: Unsupported Filter ID and its options
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* is not NULL.
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* - LZMA_PROG_ERROR: src or dest is NULL.
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*/
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extern LZMA_API(lzma_ret) lzma_filters_copy(
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const lzma_filter *src, lzma_filter *dest,
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const lzma_allocator *allocator) lzma_nothrow;
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/**
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* \brief Calculate approximate memory requirements for raw encoder
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*
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* This function can be used to calculate the memory requirements for
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* Block and Stream encoders too because Block and Stream encoders don't
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* need significantly more memory than raw encoder.
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*
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* \param filters Array of filters terminated with
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* .id == LZMA_VLI_UNKNOWN.
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*
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* \return Number of bytes of memory required for the given
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* filter chain when encoding. If an error occurs,
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* for example due to unsupported filter chain,
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* UINT64_MAX is returned.
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*/
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extern LZMA_API(uint64_t) lzma_raw_encoder_memusage(const lzma_filter *filters)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Calculate approximate memory requirements for raw decoder
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*
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* This function can be used to calculate the memory requirements for
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* Block and Stream decoders too because Block and Stream decoders don't
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* need significantly more memory than raw decoder.
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*
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* \param filters Array of filters terminated with
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* .id == LZMA_VLI_UNKNOWN.
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*
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* \return Number of bytes of memory required for the given
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* filter chain when decoding. If an error occurs,
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* for example due to unsupported filter chain,
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* UINT64_MAX is returned.
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*/
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extern LZMA_API(uint64_t) lzma_raw_decoder_memusage(const lzma_filter *filters)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Initialize raw encoder
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*
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* This function may be useful when implementing custom file formats.
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*
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* \param strm Pointer to properly prepared lzma_stream
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* \param filters Array of lzma_filter structures. The end of the
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* array must be marked with .id = LZMA_VLI_UNKNOWN.
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*
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* The `action' with lzma_code() can be LZMA_RUN, LZMA_SYNC_FLUSH (if the
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* filter chain supports it), or LZMA_FINISH.
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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_raw_encoder(
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lzma_stream *strm, const lzma_filter *filters)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Initialize raw decoder
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*
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* The initialization of raw decoder goes similarly to raw encoder.
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*
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* The `action' with lzma_code() can be LZMA_RUN or LZMA_FINISH. Using
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* LZMA_FINISH is not required, it is supported just for convenience.
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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_raw_decoder(
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lzma_stream *strm, const lzma_filter *filters)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Update the filter chain in the encoder
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*
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* This function is for advanced users only. This function has two slightly
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* different purposes:
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*
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* - After LZMA_FULL_FLUSH when using Stream encoder: Set a new filter
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* chain, which will be used starting from the next Block.
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*
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* - After LZMA_SYNC_FLUSH using Raw, Block, or Stream encoder: Change
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* the filter-specific options in the middle of encoding. The actual
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* filters in the chain (Filter IDs) cannot be changed. In the future,
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* it might become possible to change the filter options without
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* using LZMA_SYNC_FLUSH.
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*
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* While rarely useful, this function may be called also when no data has
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* been compressed yet. In that case, this function will behave as if
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* LZMA_FULL_FLUSH (Stream encoder) or LZMA_SYNC_FLUSH (Raw or Block
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* encoder) had been used right before calling this function.
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*
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* \return - LZMA_OK
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* - LZMA_MEM_ERROR
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* - LZMA_MEMLIMIT_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_filters_update(
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lzma_stream *strm, const lzma_filter *filters) lzma_nothrow;
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/**
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* \brief Single-call raw encoder
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*
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* \param filters Array of lzma_filter structures. The end of the
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* array must be marked with .id = LZMA_VLI_UNKNOWN.
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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_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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* \note There is no function to calculate how big output buffer
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* would surely be big enough. (lzma_stream_buffer_bound()
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* works only for lzma_stream_buffer_encode(); raw encoder
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* won't necessarily meet that bound.)
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*/
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extern LZMA_API(lzma_ret) lzma_raw_buffer_encode(
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const lzma_filter *filters, const lzma_allocator *allocator,
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const uint8_t *in, size_t in_size, uint8_t *out,
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size_t *out_pos, size_t out_size) lzma_nothrow;
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/**
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* \brief Single-call raw decoder
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*
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* \param filters Array of lzma_filter structures. The end of the
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* array must be marked with .id = LZMA_VLI_UNKNOWN.
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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 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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extern LZMA_API(lzma_ret) lzma_raw_buffer_decode(
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const lzma_filter *filters, const 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) lzma_nothrow;
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/**
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* \brief Get the size of the Filter Properties field
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*
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* This function may be useful when implementing custom file formats
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* using the raw encoder and decoder.
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*
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* \param size Pointer to uint32_t to hold the size of the properties
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* \param filter Filter ID and options (the size of the properties may
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* vary depending on the options)
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*
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* \return - LZMA_OK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_PROG_ERROR
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*
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* \note This function validates the Filter ID, but does not
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* necessarily validate the options. Thus, it is possible
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* that this returns LZMA_OK while the following call to
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* lzma_properties_encode() returns LZMA_OPTIONS_ERROR.
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*/
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extern LZMA_API(lzma_ret) lzma_properties_size(
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uint32_t *size, const lzma_filter *filter) lzma_nothrow;
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/**
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* \brief Encode the Filter Properties field
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*
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* \param filter Filter ID and options
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* \param props Buffer to hold the encoded options. The size of
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* buffer must have been already determined with
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* lzma_properties_size().
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*
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* \return - LZMA_OK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_PROG_ERROR
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*
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* \note Even this function won't validate more options than actually
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* necessary. Thus, it is possible that encoding the properties
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* succeeds but using the same options to initialize the encoder
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* will fail.
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*
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* \note If lzma_properties_size() indicated that the size
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* of the Filter Properties field is zero, calling
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* lzma_properties_encode() is not required, but it
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* won't do any harm either.
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*/
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extern LZMA_API(lzma_ret) lzma_properties_encode(
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const lzma_filter *filter, uint8_t *props) lzma_nothrow;
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/**
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* \brief Decode the Filter Properties field
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*
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* \param filter filter->id must have been set to the correct
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* Filter ID. filter->options doesn't need to be
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* initialized (it's not freed by this function). The
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* decoded options will be stored to filter->options.
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* filter->options is set to NULL if there are no
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* properties or if an error occurs.
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* \param allocator Custom memory allocator used to allocate the
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* options. Set to NULL to use the default malloc(),
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* and in case of an error, also free().
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* \param props Input buffer containing the properties.
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* \param props_size Size of the properties. This must be the exact
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* size; giving too much or too little input will
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* return LZMA_OPTIONS_ERROR.
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*
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* \return - LZMA_OK
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* - LZMA_OPTIONS_ERROR
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* - LZMA_MEM_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_properties_decode(
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lzma_filter *filter, const lzma_allocator *allocator,
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const uint8_t *props, size_t props_size) lzma_nothrow;
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/**
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* \brief Calculate encoded size of a Filter Flags field
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*
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* Knowing the size of Filter Flags is useful to know when allocating
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* memory to hold the encoded Filter Flags.
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*
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* \param size Pointer to integer to hold the calculated size
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* \param filter Filter ID and associated options whose encoded
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* size is to be calculated
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*
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* \return - LZMA_OK: *size set successfully. Note that this doesn't
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* guarantee that filter->options is valid, thus
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* lzma_filter_flags_encode() may still fail.
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* - LZMA_OPTIONS_ERROR: Unknown Filter ID or unsupported options.
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* - LZMA_PROG_ERROR: Invalid options
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*
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* \note If you need to calculate size of List of Filter Flags,
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* you need to loop over every lzma_filter entry.
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*/
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extern LZMA_API(lzma_ret) lzma_filter_flags_size(
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uint32_t *size, const lzma_filter *filter)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Encode Filter Flags into given buffer
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*
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* In contrast to some functions, this doesn't allocate the needed buffer.
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* This is due to how this function is used internally by liblzma.
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*
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* \param filter Filter ID and options to be encoded
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* \param out Beginning of the output buffer
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* \param out_pos out[*out_pos] is the next write position. This
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* is updated by the encoder.
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* \param out_size out[out_size] is the first byte to not write.
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*
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* \return - LZMA_OK: Encoding was successful.
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* - LZMA_OPTIONS_ERROR: Invalid or unsupported options.
|
||
|
* - LZMA_PROG_ERROR: Invalid options or not enough output
|
||
|
* buffer space (you should have checked it with
|
||
|
* lzma_filter_flags_size()).
|
||
|
*/
|
||
|
extern LZMA_API(lzma_ret) lzma_filter_flags_encode(const lzma_filter *filter,
|
||
|
uint8_t *out, size_t *out_pos, size_t out_size)
|
||
|
lzma_nothrow lzma_attr_warn_unused_result;
|
||
|
|
||
|
|
||
|
/**
|
||
|
* \brief Decode Filter Flags from given buffer
|
||
|
*
|
||
|
* The decoded result is stored into *filter. The old value of
|
||
|
* filter->options is not free()d.
|
||
|
*
|
||
|
* \return - LZMA_OK
|
||
|
* - LZMA_OPTIONS_ERROR
|
||
|
* - LZMA_MEM_ERROR
|
||
|
* - LZMA_PROG_ERROR
|
||
|
*/
|
||
|
extern LZMA_API(lzma_ret) lzma_filter_flags_decode(
|
||
|
lzma_filter *filter, const lzma_allocator *allocator,
|
||
|
const uint8_t *in, size_t *in_pos, size_t in_size)
|
||
|
lzma_nothrow lzma_attr_warn_unused_result;
|