liblzma: Improve documentation in index.h
All functions now explicitly specify parameter and return values.
This commit is contained in:
Jia Tan
parent
421f2f2e16
commit
9c71db4e88
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@ -317,6 +317,11 @@ typedef enum {
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* the given number of Streams and Blocks in lzma_index structure. This
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* value may vary between CPU architectures and also between liblzma versions
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* if the internal implementation is modified.
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*
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* \param streams Number of Streams
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* \param blocks Number of Blocks
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*
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* \return Approximate memory in bytes needed in a lzma_index structure.
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*/
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extern LZMA_API(uint64_t) lzma_index_memusage(
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lzma_vli streams, lzma_vli blocks) lzma_nothrow;
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@ -327,6 +332,10 @@ extern LZMA_API(uint64_t) lzma_index_memusage(
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*
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* This is a shorthand for lzma_index_memusage(lzma_index_stream_count(i),
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* lzma_index_block_count(i)).
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Approximate memory in bytes used by the lzma_index structure.
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*/
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extern LZMA_API(uint64_t) lzma_index_memused(const lzma_index *i)
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lzma_nothrow;
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@ -335,6 +344,9 @@ extern LZMA_API(uint64_t) lzma_index_memused(const lzma_index *i)
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/**
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* \brief Allocate and initialize a new lzma_index structure
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*
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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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*
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* \return On success, a pointer to an empty initialized lzma_index is
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* returned. If allocation fails, NULL is returned.
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*/
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@ -346,6 +358,10 @@ extern LZMA_API(lzma_index *) lzma_index_init(const lzma_allocator *allocator)
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* \brief Deallocate lzma_index
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*
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* If i is NULL, this does nothing.
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*
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* \param i Pointer to lzma_index structure to deallocate
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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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*/
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extern LZMA_API(void) lzma_index_end(
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lzma_index *i, const lzma_allocator *allocator) lzma_nothrow;
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@ -355,8 +371,9 @@ extern LZMA_API(void) lzma_index_end(
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* \brief Add a new Block to lzma_index
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*
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* \param i Pointer to a lzma_index structure
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* \param allocator Pointer to lzma_allocator, or NULL to
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* use malloc()
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* \param allocator lzma_allocator for custom allocator
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* functions. Set to NULL to use malloc()
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* and free().
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* \param unpadded_size Unpadded Size of a Block. This can be
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* calculated with lzma_block_unpadded_size()
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* after encoding or decoding the Block.
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@ -369,7 +386,8 @@ extern LZMA_API(void) lzma_index_end(
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* lzma_index_append() it is possible to read the next Block with
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* an existing iterator.
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*
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* \return - LZMA_OK
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* \return Possible lzma_ret values:
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* - LZMA_OK
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* - LZMA_MEM_ERROR
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* - LZMA_DATA_ERROR: Compressed or uncompressed size of the
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* Stream or size of the Index field would grow too big.
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@ -389,11 +407,15 @@ extern LZMA_API(lzma_ret) lzma_index_append(
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* lzma_index, because to decode Blocks, knowing the integrity check type
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* is needed.
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*
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* The given Stream Flags are copied into internal preallocated structure
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* in the lzma_index, thus the caller doesn't need to keep the *stream_flags
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* available after calling this function.
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* \param i Pointer to lzma_index structure
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* \param stream_flags Pointer to lzma_stream_flags structure. This
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* is copied into the internal preallocated
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* structure, so the caller doesn't need to keep
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* the flags' data available after calling this
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* function.
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*
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* \return - LZMA_OK
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* \return Possible lzma_ret values:
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* - LZMA_OK
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* - LZMA_OPTIONS_ERROR: Unsupported stream_flags->version.
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* - LZMA_PROG_ERROR
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*/
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@ -411,6 +433,10 @@ extern LZMA_API(lzma_ret) lzma_index_stream_flags(
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* showing the Check types to the user.
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*
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* The bitmask is 1 << check_id, e.g. CRC32 is 1 << 1 and SHA-256 is 1 << 10.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Bitmask indicating which Check types are used in the lzma_index
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*/
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extern LZMA_API(uint32_t) lzma_index_checks(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -425,7 +451,8 @@ extern LZMA_API(uint32_t) lzma_index_checks(const lzma_index *i)
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*
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* By default, the amount of Stream Padding is assumed to be zero bytes.
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*
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* \return - LZMA_OK
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* \return Possible lzma_ret values:
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* - LZMA_OK
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* - LZMA_DATA_ERROR: The file size would grow too big.
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* - LZMA_PROG_ERROR
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*/
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@ -436,6 +463,10 @@ extern LZMA_API(lzma_ret) lzma_index_stream_padding(
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/**
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* \brief Get the number of Streams
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Number of Streams in the lzma_index
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*/
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extern LZMA_API(lzma_vli) lzma_index_stream_count(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -446,6 +477,10 @@ extern LZMA_API(lzma_vli) lzma_index_stream_count(const lzma_index *i)
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*
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* This returns the total number of Blocks in lzma_index. To get number
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* of Blocks in individual Streams, use lzma_index_iter.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Number of blocks in the lzma_index
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*/
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extern LZMA_API(lzma_vli) lzma_index_block_count(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -455,6 +490,10 @@ extern LZMA_API(lzma_vli) lzma_index_block_count(const lzma_index *i)
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* \brief Get the size of the Index field as bytes
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*
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* This is needed to verify the Backward Size field in the Stream Footer.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Size in bytes of the Index
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*/
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extern LZMA_API(lzma_vli) lzma_index_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -466,6 +505,11 @@ extern LZMA_API(lzma_vli) lzma_index_size(const lzma_index *i)
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* If multiple lzma_indexes have been combined, this works as if the Blocks
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* were in a single Stream. This is useful if you are going to combine
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* Blocks from multiple Streams into a single new Stream.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Size in bytes of the Stream (if all Blocks are combined
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* into one Stream).
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*/
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extern LZMA_API(lzma_vli) lzma_index_stream_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -476,6 +520,10 @@ extern LZMA_API(lzma_vli) lzma_index_stream_size(const lzma_index *i)
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*
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* This doesn't include the Stream Header, Stream Footer, Stream Padding,
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* or Index fields.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Size in bytes of all Blocks in the Stream(s)
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*/
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extern LZMA_API(lzma_vli) lzma_index_total_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -488,6 +536,10 @@ extern LZMA_API(lzma_vli) lzma_index_total_size(const lzma_index *i)
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* no Stream Padding, this function is identical to lzma_index_stream_size().
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* If multiple lzma_indexes have been combined, this includes also the headers
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* of each separate Stream and the possible Stream Padding fields.
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Total size of the .xz file in bytes
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*/
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extern LZMA_API(lzma_vli) lzma_index_file_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -495,6 +547,10 @@ extern LZMA_API(lzma_vli) lzma_index_file_size(const lzma_index *i)
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/**
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* \brief Get the uncompressed size of the file
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*
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* \param i Pointer to lzma_index structure
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*
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* \return Size in bytes of the uncompressed data in the file
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*/
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extern LZMA_API(lzma_vli) lzma_index_uncompressed_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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@ -503,9 +559,6 @@ extern LZMA_API(lzma_vli) lzma_index_uncompressed_size(const lzma_index *i)
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/**
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* \brief Initialize an iterator
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*
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* \param iter Pointer to a lzma_index_iter structure
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* \param i lzma_index to which the iterator will be associated
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*
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* This function associates the iterator with the given lzma_index, and calls
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* lzma_index_iter_rewind() on the iterator.
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*
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@ -518,6 +571,9 @@ extern LZMA_API(lzma_vli) lzma_index_uncompressed_size(const lzma_index *i)
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*
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* It is safe to make copies of an initialized lzma_index_iter, for example,
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* to easily restart reading at some particular position.
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*
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* \param iter Pointer to a lzma_index_iter structure
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* \param i lzma_index to which the iterator will be associated
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*/
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extern LZMA_API(void) lzma_index_iter_init(
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lzma_index_iter *iter, const lzma_index *i) lzma_nothrow;
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@ -528,6 +584,8 @@ extern LZMA_API(void) lzma_index_iter_init(
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*
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* Rewind the iterator so that next call to lzma_index_iter_next() will
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* return the first Block or Stream.
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*
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* \param iter Pointer to a lzma_index_iter structure
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*/
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extern LZMA_API(void) lzma_index_iter_rewind(lzma_index_iter *iter)
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lzma_nothrow;
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@ -540,11 +598,11 @@ extern LZMA_API(void) lzma_index_iter_rewind(lzma_index_iter *iter)
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* \param mode Specify what kind of information the caller wants
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* to get. See lzma_index_iter_mode for details.
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*
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* \return If next Block or Stream matching the mode was found, *iter
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* is updated and this function returns false. If no Block or
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* Stream matching the mode is found, *iter is not modified
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* and this function returns true. If mode is set to an unknown
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* value, *iter is not modified and this function returns true.
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* \return lzma_bool:
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* - true if no Block or Stream matching the mode is found.
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* *iter is not updated (failure).
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* - false if the next Block or Stream matching the mode was
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* found. *iter is updated (success).
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*/
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extern LZMA_API(lzma_bool) lzma_index_iter_next(
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lzma_index_iter *iter, lzma_index_iter_mode mode)
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@ -558,21 +616,26 @@ extern LZMA_API(lzma_bool) lzma_index_iter_next(
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* the Index field(s) and use lzma_index_iter_locate() to do random-access
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* reading with granularity of Block size.
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*
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* \param iter Iterator that was earlier initialized with
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* lzma_index_iter_init().
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* \param target Uncompressed target offset which the caller would
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* like to locate from the Stream
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*
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* If the target is smaller than the uncompressed size of the Stream (can be
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* checked with lzma_index_uncompressed_size()):
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* - Information about the Stream and Block containing the requested
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* uncompressed offset is stored into *iter.
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* - Internal state of the iterator is adjusted so that
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* lzma_index_iter_next() can be used to read subsequent Blocks or Streams.
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* - This function returns false.
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*
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* If target is greater than the uncompressed size of the Stream, *iter
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* is not modified, and this function returns true.
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* If the target is greater than the uncompressed size of the Stream, *iter
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* is not modified.
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*
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* \param iter Iterator that was earlier initialized with
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* lzma_index_iter_init().
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* \param target Uncompressed target offset which the caller would
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* like to locate from the Stream
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*
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* \return lzma_bool:
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* - true if the target is greater than or equal to the
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* uncompressed size of the Stream (failure)
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* - false if the target is smaller than the uncompressed size
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* of the Stream (success)
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*/
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extern LZMA_API(lzma_bool) lzma_index_iter_locate(
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lzma_index_iter *iter, lzma_vli target) lzma_nothrow;
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@ -585,15 +648,16 @@ extern LZMA_API(lzma_bool) lzma_index_iter_locate(
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* multi-Stream .xz file, or when combining multiple Streams into single
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* Stream.
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*
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* \param dest lzma_index after which src is appended
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* \param[out] dest lzma_index after which src is appended
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* \param src lzma_index to be appended after dest. If this
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* function succeeds, the memory allocated for src
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* is freed or moved to be part of dest, and all
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* iterators pointing to src will become invalid.
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* \param allocator Custom memory allocator; can be NULL to use
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* malloc() and free().
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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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*
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* \return - LZMA_OK: lzma_indexes were concatenated successfully.
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* \return Possible lzma_ret values:
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* - LZMA_OK: lzma_indexes were concatenated successfully.
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* src is now a dangling pointer.
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* - LZMA_DATA_ERROR: *dest would grow too big.
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* - LZMA_MEM_ERROR
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@ -607,6 +671,10 @@ extern LZMA_API(lzma_ret) lzma_index_cat(lzma_index *dest, lzma_index *src,
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/**
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* \brief Duplicate lzma_index
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*
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* \param i Pointer to lzma_index structure to be duplicated
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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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*
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* \return A copy of the lzma_index, or NULL if memory allocation failed.
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*/
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extern LZMA_API(lzma_index *) lzma_index_dup(
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@ -623,7 +691,8 @@ extern LZMA_API(lzma_index *) lzma_index_dup(
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* The valid `action' values for lzma_code() are LZMA_RUN and LZMA_FINISH.
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* It is enough to use only one of them (you can choose freely).
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*
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* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
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* \return Possible lzma_ret values:
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* - LZMA_OK: Initialization succeeded, continue with lzma_code().
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* - LZMA_MEM_ERROR
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* - LZMA_PROG_ERROR
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*/
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@ -636,7 +705,7 @@ extern LZMA_API(lzma_ret) lzma_index_encoder(
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* \brief Initialize .xz Index decoder
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*
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* \param strm Pointer to properly prepared lzma_stream
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* \param i The decoded Index will be made available via
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* \param[out] i The decoded Index will be made available via
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* this pointer. Initially this function will
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* set *i to NULL (the old value is ignored). If
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* decoding succeeds (lzma_code() returns
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@ -652,11 +721,12 @@ extern LZMA_API(lzma_ret) lzma_index_encoder(
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* There is no need to use LZMA_FINISH, but it's allowed because it may
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* simplify certain types of applications.
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*
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* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
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* \return Possible lzma_ret values:
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* - LZMA_OK: Initialization succeeded, continue with lzma_code().
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* - LZMA_MEM_ERROR
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* - LZMA_PROG_ERROR
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*
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* liblzma 5.2.3 and older list also LZMA_MEMLIMIT_ERROR here
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* \note liblzma 5.2.3 and older list also LZMA_MEMLIMIT_ERROR here
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* but that error code has never been possible from this
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* initialization function.
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*/
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@ -668,21 +738,23 @@ extern LZMA_API(lzma_ret) lzma_index_decoder(
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/**
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* \brief Single-call .xz Index encoder
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*
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* \note This function doesn't take allocator argument since all
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* the internal data is allocated on stack.
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*
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* \param i lzma_index to be encoded
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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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* \param[out] out Beginning of the output buffer
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* \param[out] 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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* \return Possible lzma_ret values:
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* - LZMA_OK: Encoding was successful.
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* - LZMA_BUF_ERROR: Output buffer is too small. Use
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* lzma_index_size() to find out how much output
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* space is needed.
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* - LZMA_PROG_ERROR
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*
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* \note This function doesn't take allocator argument since all
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* the internal data is allocated on stack.
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*/
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extern LZMA_API(lzma_ret) lzma_index_buffer_encode(const lzma_index *i,
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uint8_t *out, size_t *out_pos, size_t out_size) lzma_nothrow;
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@ -691,24 +763,26 @@ extern LZMA_API(lzma_ret) lzma_index_buffer_encode(const lzma_index *i,
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/**
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* \brief Single-call .xz Index decoder
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*
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* \param i If decoding succeeds, *i will point to a new
|
||||
* \param[out] i If decoding succeeds, *i will point to a new
|
||||
* lzma_index, which the application has to
|
||||
* later free with lzma_index_end(). If an error
|
||||
* occurs, *i will be NULL. The old value of *i
|
||||
* is always ignored and thus doesn't need to be
|
||||
* initialized by the caller.
|
||||
* \param memlimit Pointer to how much memory the resulting
|
||||
* \param[out] memlimit Pointer to how much memory the resulting
|
||||
* lzma_index is allowed to require. The value
|
||||
* pointed by this pointer is modified if and only
|
||||
* if LZMA_MEMLIMIT_ERROR is returned.
|
||||
* \param allocator Pointer to lzma_allocator, or NULL to use malloc()
|
||||
* \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].
|
||||
*
|
||||
* \return - LZMA_OK: Decoding was successful.
|
||||
* \return Possible lzma_ret values:
|
||||
* - LZMA_OK: Decoding was successful.
|
||||
* - LZMA_MEM_ERROR
|
||||
* - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached.
|
||||
* The minimum required memlimit value was stored to *memlimit.
|
||||
|
|
@ -724,15 +798,6 @@ extern LZMA_API(lzma_ret) lzma_index_buffer_decode(lzma_index **i,
|
|||
/**
|
||||
* \brief Initialize a .xz file information decoder
|
||||
*
|
||||
* \param strm Pointer to a properly prepared lzma_stream
|
||||
* \param dest_index Pointer to a pointer where the decoder will put
|
||||
* the decoded lzma_index. The old value
|
||||
* of *dest_index is ignored (not freed).
|
||||
* \param memlimit How much memory the resulting lzma_index is
|
||||
* allowed to require. Use UINT64_MAX to
|
||||
* effectively disable the limiter.
|
||||
* \param file_size Size of the input .xz file
|
||||
*
|
||||
* This decoder decodes the Stream Header, Stream Footer, Index, and
|
||||
* Stream Padding field(s) from the input .xz file and stores the resulting
|
||||
* combined index in *dest_index. This information can be used to get the
|
||||
|
|
@ -777,7 +842,17 @@ extern LZMA_API(lzma_ret) lzma_index_buffer_decode(lzma_index **i,
|
|||
* - LZMA_MEMLIMIT_ERROR
|
||||
* - LZMA_PROG_ERROR
|
||||
*
|
||||
* \return - LZMA_OK
|
||||
* \param strm Pointer to a properly prepared lzma_stream
|
||||
* \param[out] dest_index Pointer to a pointer where the decoder will put
|
||||
* the decoded lzma_index. The old value
|
||||
* of *dest_index is ignored (not freed).
|
||||
* \param memlimit How much memory the resulting lzma_index is
|
||||
* allowed to require. Use UINT64_MAX to
|
||||
* effectively disable the limiter.
|
||||
* \param file_size Size of the input .xz file
|
||||
*
|
||||
* \return Possible lzma_ret values:
|
||||
* - LZMA_OK
|
||||
* - LZMA_MEM_ERROR
|
||||
* - LZMA_PROG_ERROR
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue