Classes
class	Page
	Stores a variable-size, compressed, delayed-load Page of data that is loaded into memory when accessed. Access to the Page is thread-safe as loading and decompressing the data is protected by a mutex. More...

class	PagedInputStream
	A Paging wrapper to std::istream that is responsible for reading from a given input stream and creating Page objects and PageHandles that reference those pages for delayed reading. More...

class	PagedOutputStream
	A Paging wrapper to std::ostream that is responsible for writing from a given output stream at intervals set by the PageSize. As Pages are variable in size, they are flushed to disk as soon as sufficiently large. More...

class	PageHandle
	A PageHandle holds a unique ptr to a Page and a specific stream pointer to a point within the decompressed Page buffer. More...

Functions
OPENVDB_API bool	bloscCanCompress ()
	Returns true if compression is available. More...

OPENVDB_API size_t	bloscUncompressedSize (const char *buffer)
	Retrieves the uncompressed size of buffer when uncompressed. More...

OPENVDB_API void	bloscCompress (char compressedBuffer, size_t &compressedBytes, const size_t bufferBytes, const char uncompressedBuffer, const size_t uncompressedBytes)
	Compress into the supplied buffer. More...

OPENVDB_API std::unique_ptr< char[]>	bloscCompress (const char *buffer, const size_t uncompressedBytes, size_t &compressedBytes, const bool resize=true)
	Compress and return the heap-allocated compressed buffer. More...

OPENVDB_API size_t	bloscCompressedSize (const char *buffer, const size_t uncompressedBytes)
	Convenience wrapper to retrieve the compressed size of buffer when compressed. More...

OPENVDB_API void	bloscDecompress (char uncompressedBuffer, const size_t expectedBytes, const size_t bufferBytes, const char compressedBuffer)
	Decompress into the supplied buffer. Will throw if decompression fails or uncompressed buffer has insufficient space in which to decompress. More...

OPENVDB_API std::unique_ptr< char[]>	bloscDecompress (const char *buffer, const size_t expectedBytes, const bool resize=true)
	Decompress and return the the heap-allocated uncompressed buffer. More...

Function Documentation

OPENVDB_API bool openvdb::v12_0::compression::bloscCanCompress ( )

Returns true if compression is available.

OPENVDB_API void openvdb::v12_0::compression::bloscCompress	(	char *	compressedBuffer,
		size_t &	compressedBytes,
		const size_t	bufferBytes,
		const char *	uncompressedBuffer,
		const size_t	uncompressedBytes
	)

Compress into the supplied buffer.

Parameters

compressedBuffer	the buffer to compress
compressedBytes	number of compressed bytes
bufferBytes	the number of bytes in compressedBuffer available to be filled
uncompressedBuffer	the uncompressed buffer to compress
uncompressedBytes	number of uncompressed bytes

OPENVDB_API std::unique_ptr<char[]> openvdb::v12_0::compression::bloscCompress	(	const char *	buffer,
		const size_t	uncompressedBytes,
		size_t &	compressedBytes,
		const bool	resize = `true`
	)

Compress and return the heap-allocated compressed buffer.

Parameters

buffer	the buffer to compress
uncompressedBytes	number of uncompressed bytes
compressedBytes	number of compressed bytes (written to this variable)
resize	the compressed buffer will be exactly resized to remove the portion used for Blosc overhead, for efficiency this can be skipped if it is known that the resulting buffer is temporary

OPENVDB_API size_t openvdb::v12_0::compression::bloscCompressedSize	(	const char *	buffer,
		const size_t	uncompressedBytes
	)

Convenience wrapper to retrieve the compressed size of buffer when compressed.

Parameters

buffer	the uncompressed buffer
uncompressedBytes	number of uncompressed bytes

OPENVDB_API void openvdb::v12_0::compression::bloscDecompress	(	char *	uncompressedBuffer,
		const size_t	expectedBytes,
		const size_t	bufferBytes,
		const char *	compressedBuffer
	)

Decompress into the supplied buffer. Will throw if decompression fails or uncompressed buffer has insufficient space in which to decompress.

Parameters

uncompressedBuffer	the uncompressed buffer to decompress into
expectedBytes	the number of bytes expected once the buffer is decompressed
bufferBytes	the number of bytes in uncompressedBuffer available to be filled
compressedBuffer	the compressed buffer to decompress

OPENVDB_API std::unique_ptr<char[]> openvdb::v12_0::compression::bloscDecompress	(	const char *	buffer,
		const size_t	expectedBytes,
		const bool	resize = `true`
	)

Decompress and return the the heap-allocated uncompressed buffer.

Parameters

buffer	the buffer to decompress
expectedBytes	the number of bytes expected once the buffer is decompressed
resize	the compressed buffer will be exactly resized to remove the portion used for Blosc overhead, for efficiency this can be skipped if it is known that the resulting buffer is temporary

OPENVDB_API size_t openvdb::v12_0::compression::bloscUncompressedSize ( const char * buffer )

Retrieves the uncompressed size of buffer when uncompressed.

Parameters

buffer the compressed buffer

Variable Documentation

const int BLOSC_MINIMUM_BYTES = 48

static

const int BLOSC_PAD_BYTES = 128

static

const int PageSize = 1024 * 1024

static