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NCBI C++ ToolKit: include/util/compress/zlib.hpp Source File

fAllowTransparentRead = (1<<0),

fAllowEmptyData = (1<<1),

fCheckFileHeader = (1<<2),

fWriteGZipFormat = (1<<3),

fAllowConcatenatedGZip = (1<<4),

fGZip = fCheckFileHeader | fWriteGZipFormat | fAllowConcatenatedGZip,

fRestoreFileAttr = (1<<5)

{

(eLevel_Default); };

* src_buf,

src_len,

* dst_buf,

dst_size,

* src_buf,

src_len,

* dst_buf,

dst_size,

& src_file,

& dst_file,

& src_file,

& dst_file,

& src_file,

& dst_dir,

m_cd_WindowBits = (window_bits ==

) ? GetWindowBitsDefault() : window_bits;

level = eLevel_Default,

level = eLevel_Default

level = eLevel_Default,

{

(

() & fAllowEmptyData) == fAllowEmptyData; }

* out_buf,

out_size,

{

(

() & fAllowEmptyData) == fAllowEmptyData; }

* out_buf,

out_size,

streamsize in_bufsize,

streamsize out_bufsize,

streamsize in_bufsize,

streamsize out_bufsize,

CZipCompressor – zlib based compressor.

CZipDecompressor – zlib based decompressor.

CZipStreamCompressor – zlib based compression stream processor.

CZipStreamDecompressor – zlib based decompression stream processor.

Interface class to scan data source for seekable data chunks.

void(*)(CSeq_entry_Handle seh, IWorkbench *wb, const CSerialObject &obj) handler

@ eNoOwnership

No ownership is assumed.

virtual long Write(const void *buf, size_t len)

Write data to compressed file.

virtual bool DecompressFileIntoDir(const string &src_file, const string &dst_dir, size_t file_io_bufsize=kCompressionDefaultBufSize, size_t decompression_in_bufsize=kCompressionDefaultBufSize, size_t decompression_out_bufsize=kCompressionDefaultBufSize)

Decompress file into specified directory.

void SetFileInfo(const SFileInfo &info)

Set information about compressed file.

void SetMemoryLevel(int mem_level)

Memory level.

void g_GZip_ScanForChunks(CNcbiIstream &is, IChunkHandler &handler)

Get list of positions of separate gzip files in the concatenated gzip file.

void GetStreamError(void)

Get error code/description of last stream operation (m_Stream).

static SRecommendedBufferSizes GetRecommendedBufferSizes(size_t round_up=0)

Get recommended buffer sizes for stream/file I/O.

virtual size_t EstimateCompressionBufferSize(size_t src_len)

Estimate buffer size for data compression.

void SetWindowBits(int window_bits)

Window bits.

unsigned long m_CRC32

CRC32 for compressed data.

virtual EStatus End(int abandon=0)

Free all dynamically allocated data structures.

bool m_NeedWriteHeader

Is true if needed to write a file header.

size_t m_SkipInput

Number of bytes to skip from input stream.

virtual bool Open(const string &file_name, EMode mode, size_t compression_in_bufsize=kCompressionDefaultBufSize, size_t compression_out_bufsize=kCompressionDefaultBufSize)

Opens a compressed file for reading or writing.

CZipStreamDecompressor(CZipCompression::TZipFlags flags=0)

Conventional constructor.

CZipCompressionFile(const CZipCompressionFile &)

Private copy constructor to prohibit copy.

string m_Cache

Buffer to cache small pieces of data.

virtual EStatus Flush(char *out_buf, size_t out_size, size_t *out_avail)

Flush compressed/decompressed data from the output buffer.

void * m_Stream

Compressor stream.

static int GetMemoryLevelMax(void)

virtual TFlags GetFlags(void) const

Get/set flags.

const int kZlibDefaultStrategy

CZipCompressor(ELevel level=eLevel_Default, TZipFlags flags=0)

Constructor.

static int GetMemoryLevelMin(void)

ELevel

Compression level.

static int GetWindowBitsMin(void)

int GetMemoryLevel(void) const

virtual EStatus Init(void)

Initialize the internal stream state for compression/decompression.

CZipCompression::TFlags TZipFlags

Bitwise OR of EFlags.

virtual EStatus Finish(char *out_buf, size_t out_size, size_t *out_avail)

Finish the compression/decompression process.

virtual EStatus End(int abandon=0)

Free all dynamically allocated data structures.

virtual bool CompressFile(const string &src_file, const string &dst_file, size_t file_io_bufsize=kCompressionDefaultBufSize, size_t compression_in_bufsize=kCompressionDefaultBufSize, size_t compression_out_bufsize=kCompressionDefaultBufSize)

Compress file.

virtual long Read(void *buf, size_t len)

Read data from compressed file.

const streamsize kCompressionDefaultBufSize

Default compression I/O stream buffer size.

virtual EStatus Flush(char *out_buf, size_t out_size, size_t *out_avail)

Flush compressed/decompressed data from the output buffer.

const int kZlibDefaultCompression

CZipDecompressor * GetDecompressor(void) const

Return a pointer to decompressor.

virtual bool DecompressFile(const string &src_file, const string &dst_file, size_t file_io_bufsize=kCompressionDefaultBufSize, size_t decompression_in_bufsize=kCompressionDefaultBufSize, size_t decompression_out_bufsize=kCompressionDefaultBufSize)

Decompress file.

CZipStreamCompressor(CZipCompression::ELevel level, CZipCompression::TZipFlags flags=0)

Conventional constructor.

SFileInfo m_FileInfo

Compressed file info.

static int GetWindowBitsMax(void)

CNcbiFstream * m_File

File stream.

virtual bool CompressBuffer(const void *src_buf, size_t src_len, void *dst_buf, size_t dst_size, size_t *dst_len)

Compress data in the buffer.

int m_cd_WindowBits

The base two logarithm of the window size.

virtual bool AllowEmptyData() const

Return TRUE if fAllowEmptyData flag is set.

CZipCompressionFile(const string &file_name, EMode mode, ELevel level=eLevel_Default, size_t compression_in_bufsize=kCompressionDefaultBufSize, size_t compression_out_bufsize=kCompressionDefaultBufSize)

Constructor.

virtual EStatus Process(const char *in_buf, size_t in_len, char *out_buf, size_t out_size, size_t *in_avail, size_t *out_avail)

Compress/decompress as much data as possible, and stops when the input buffer becomes empty or the ou...

int m_c_MemLevel

The allocation memory level for the compression.

int GetWindowBits(void) const

CZipDecompressor(TZipFlags flags=0)

Constructor.

const int kZlibDefaultWbits

CCompressionIOStream * m_Stream

[De]comression stream.

virtual bool Open(const string &file_name, EMode mode, SFileInfo *info, size_t compression_in_bufsize=kCompressionDefaultBufSize, size_t compression_out_bufsize=kCompressionDefaultBufSize)

Opens a compressed file for reading or writing.

CZipCompression(ELevel level=eLevel_Default)

Constructor.

virtual ~CZipCompression(void)

Destructor.

~CZipCompressionFile(void)

Destructor.

string m_Cache

Buffer to cache small pieces of data.

bool m_IsGZ

TRUE if data have gzip format.

unsigned int TFlags

Compression flags.

virtual ~CZipCompressor(void)

Destructor.

CZipStreamCompressor(CZipCompression::TZipFlags flags=0)

Conventional constructor.

virtual EStatus Process(const char *in_buf, size_t in_len, char *out_buf, size_t out_size, size_t *in_avail, size_t *out_avail)

Compress/decompress as much data as possible, and stops when the input buffer becomes empty or the ou...

const int kZlibDefaultMemLevel

int m_c_Strategy

The parameter to tune up a compression algorithm.

virtual EStatus Finish(char *out_buf, size_t out_size, size_t *out_avail)

Finish the compression/decompression process.

virtual bool SetDictionary(CCompressionDictionary &dict, ENcbiOwnership own=eNoOwnership)

Set a dictionary for all compression/decompression operations.

virtual bool Close(void)

Close compressed file.

virtual bool AllowEmptyData() const

Return TRUE if fAllowEmptyData flag is set.

virtual CVersionInfo GetVersion(void) const

Return name and version of the compression library.

static int GetStrategyMax(void)

virtual bool HaveSupport(ESupportFeature feature)

Check if compression have support for a specified feature.

string FormatErrorMessage(string where, size_t pos=0) const

Format string with last error description.

virtual ELevel GetDefaultLevel(void) const

Returns default compression level for a compression algorithm.

EStatus

Type of the result of all basic functions.

void SetStrategy(int strategy)

Compression strategy.

static int GetStrategyMin(void)

virtual EStatus Init(void)

Initialize the internal stream state for compression/decompression.

bool m_NeedCheckHeader

TRUE if needed to check to file header.

static int GetWindowBitsDefault(void)

CZipStreamDecompressor(streamsize in_bufsize, streamsize out_bufsize, CZipCompression::TZipFlags flags=0)

Full constructor.

CZipCompressionFile(ELevel level=eLevel_Default)

Conventional constructor.

static bool Initialize(void)

Initialize compression library (for API compatibility, zlib don't need it).

int GetStrategy(void) const

static int GetMemoryLevelDefault(void)

CZipCompression(const CZipCompression &)

Private copy constructor to prohibit copy.

CZipCompressor * GetCompressor(void) const

Return a pointer to compressor.

static int GetStrategyDefault(void)

CZipStreamCompressor(CZipCompression::ELevel level, streamsize in_bufsize, streamsize out_bufsize, CZipCompression::TZipFlags flags=0)

Full constructor.

EMode m_Mode

I/O mode (read/write).

virtual ~CZipDecompressor(void)

Destructor.

ESupportFeature

Supported features.

EFlags

Compression/decompression flags.

virtual bool DecompressBuffer(const void *src_buf, size_t src_len, void *dst_buf, size_t dst_size, size_t *dst_len)

Decompress data in the buffer.

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

IO_PREFIX::istream CNcbiIstream

Portable alias for istream.

IO_PREFIX::fstream CNcbiFstream

Portable alias for fstream.

ENcbiOwnership

Ownership relations between objects.

strategy

Block allocation strategies.

NCBI_XUTIL_EXPORT

Parameter to control printing diagnostic message about conversion of static array data from a differe...

Structure to get information about recommended buffer sizes for file/stream I/O to tune up a (de)comp...

Structure to keep compressed file information.

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