sssd.git - Unnamed repository; edit this file to name it for gitweb.

diff options

author	Sumit Bose <sbose@redhat.com>	2016-07-13 17:42:51 +0200
committer	Sumit Bose <sbose@redhat.com>	2016-07-13 17:42:51 +0200
commit	f76e48596bc30b19eedacd838dd306bc1607d4eb (patch)
tree	831304b8217a31e692a425d4e15bd0cb04f135ef /src/lib/idmap
parent	1785eedc84f2633588e70f879c47596e047c3838 (diff)

wipmemberof_default_view

Diffstat (limited to 'src/lib/idmap')

0 files changed, 0 insertions, 0 deletions

/* SPDX-License-Identifier: (GPL-2.0 or BSD-2-Clause) */ /* * FSE : Finite State Entropy codec * Public Prototypes declaration * Copyright (C) 2013-2016, Yann Collet. * * You can contact the author at : * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy */ #ifndef FSE_H #define FSE_H /*-***************************************** * Dependencies ******************************************/ #include <linux/types.h> /* size_t, ptrdiff_t */ /*-***************************************** * FSE_PUBLIC_API : control library symbols visibility ******************************************/ #define FSE_PUBLIC_API /*------ Version ------*/ #define FSE_VERSION_MAJOR 0 #define FSE_VERSION_MINOR 9 #define FSE_VERSION_RELEASE 0 #define FSE_LIB_VERSION FSE_VERSION_MAJOR.FSE_VERSION_MINOR.FSE_VERSION_RELEASE #define FSE_QUOTE(str) #str #define FSE_EXPAND_AND_QUOTE(str) FSE_QUOTE(str) #define FSE_VERSION_STRING FSE_EXPAND_AND_QUOTE(FSE_LIB_VERSION) #define FSE_VERSION_NUMBER (FSE_VERSION_MAJOR * 100 * 100 + FSE_VERSION_MINOR * 100 + FSE_VERSION_RELEASE) FSE_PUBLIC_API unsigned FSE_versionNumber(void); /**< library version number; to be used when checking dll version */ /*-***************************************** * Tool functions ******************************************/ FSE_PUBLIC_API size_t FSE_compressBound(size_t size); /* maximum compressed size */ /* Error Management */ FSE_PUBLIC_API unsigned FSE_isError(size_t code); /* tells if a return value is an error code */ /*-***************************************** * FSE detailed API ******************************************/ /*! FSE_compress() does the following: 1. count symbol occurrence from source[] into table count[] 2. normalize counters so that sum(count[]) == Power_of_2 (2^tableLog) 3. save normalized counters to memory buffer using writeNCount() 4. build encoding table 'CTable' from normalized counters 5. encode the data stream using encoding table 'CTable' FSE_decompress() does the following: 1. read normalized counters with readNCount() 2. build decoding table 'DTable' from normalized counters 3. decode the data stream using decoding table 'DTable' The following API allows targeting specific sub-functions for advanced tasks. For example, it's possible to compress several blocks using the same 'CTable', or to save and provide normalized distribution using external method. */ /* *** COMPRESSION *** */ /*! FSE_optimalTableLog(): dynamically downsize 'tableLog' when conditions are met. It saves CPU time, by using smaller tables, while preserving or even improving compression ratio. @return : recommended tableLog (necessarily <= 'maxTableLog') */ FSE_PUBLIC_API unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); /*! FSE_normalizeCount(): normalize counts so that sum(count[]) == Power_of_2 (2^tableLog) 'normalizedCounter' is a table of short, of minimum size (maxSymbolValue+1). @return : tableLog, or an errorCode, which can be tested using FSE_isError() */ FSE_PUBLIC_API size_t FSE_normalizeCount(short *normalizedCounter, unsigned tableLog, const unsigned *count, size_t srcSize, unsigned maxSymbolValue); /*! FSE_NCountWriteBound(): Provides the maximum possible size of an FSE normalized table, given 'maxSymbolValue' and 'tableLog'. Typically useful for allocation purpose. */ FSE_PUBLIC_API size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog); /*! FSE_writeNCount(): Compactly save 'normalizedCounter' into 'buffer'. @return : size of the compressed table, or an errorCode, which can be tested using FSE_isError(). */ FSE_PUBLIC_API size_t FSE_writeNCount(void *buffer, size_t bufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); /*! Constructor and Destructor of FSE_CTable. Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */ typedef unsigned FSE_CTable; /* don't allocate that. It's only meant to be more restrictive than void* */ /*! FSE_compress_usingCTable(): Compress `src` using `ct` into `dst` which must be already allocated. @return : size of compressed data (<= `dstCapacity`), or 0 if compressed data could not fit into `dst`, or an errorCode, which can be tested using FSE_isError() */ FSE_PUBLIC_API size_t FSE_compress_usingCTable(void *dst, size_t dstCapacity, const void *src, size_t srcSize, const FSE_CTable *ct); /*! Tutorial : ---------- The first step is to count all symbols. FSE_count() does this job very fast. Result will be saved into 'count', a table of unsigned int, which must be already allocated, and have 'maxSymbolValuePtr[0]+1' cells. 'src' is a table of bytes of size 'srcSize'. All values within 'src' MUST be <= maxSymbolValuePtr[0] maxSymbolValuePtr[0] will be updated, with its real value (necessarily <= original value) FSE_count() will return the number of occurrence of the most frequent symbol. This can be used to know if there is a single symbol within 'src', and to quickly evaluate its compressibility. If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). The next step is to normalize the frequencies. FSE_normalizeCount() will ensure that sum of frequencies is == 2 ^'tableLog'. It also guarantees a minimum of 1 to any Symbol with frequency >= 1. You can use 'tableLog'==0 to mean "use default tableLog value". If you are unsure of which tableLog value to use, you can ask FSE_optimalTableLog(), which will provide the optimal valid tableLog given sourceSize, maxSymbolValue, and a user-defined maximum (0 means "default"). The result of FSE_normalizeCount() will be saved into a table, called 'normalizedCounter', which is a table of signed short. 'normalizedCounter' must be already allocated, and have at least 'maxSymbolValue+1' cells. The return value is tableLog if everything proceeded as expected. It is 0 if there is a single symbol within distribution. If there is an error (ex: invalid tableLog value), the function will return an ErrorCode (which can be tested using FSE_isError()). 'normalizedCounter' can be saved in a compact manner to a memory area using FSE_writeNCount(). 'buffer' must be already allocated. For guaranteed success, buffer size must be at least FSE_headerBound(). The result of the function is the number of bytes written into 'buffer'. If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError(); ex : buffer size too small). 'normalizedCounter' can then be used to create the compression table 'CTable'. The space required by 'CTable' must be already allocated, using FSE_createCTable(). You can then use FSE_buildCTable() to fill 'CTable'. If there is an error, both functions will return an ErrorCode (which can be tested using FSE_isError()). 'CTable' can then be used to compress 'src', with FSE_compress_usingCTable(). Similar to FSE_count(), the convention is that 'src' is assumed to be a table of char of size 'srcSize' The function returns the size of compressed data (without header), necessarily <= `dstCapacity`. If it returns '0', compressed data could not fit into 'dst'. If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). */ /* *** DECOMPRESSION *** */ /*! FSE_readNCount(): Read compactly saved 'normalizedCounter' from 'rBuffer'. @return : size read from 'rBuffer', or an errorCode, which can be tested using FSE_isError(). maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */ FSE_PUBLIC_API size_t FSE_readNCount(short *normalizedCounter, unsigned *maxSymbolValuePtr, unsigned *tableLogPtr, const void *rBuffer, size_t rBuffSize); /*! Constructor and Destructor of FSE_DTable. Note that its size depends on 'tableLog' */ typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ /*! FSE_buildDTable(): Builds 'dt', which must be already allocated, using FSE_createDTable(). return : 0, or an errorCode, which can be tested using FSE_isError() */ FSE_PUBLIC_API size_t FSE_buildDTable_wksp(FSE_DTable *dt, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workspace, size_t workspaceSize); /*! FSE_decompress_usingDTable(): Decompress compressed source `cSrc` of size `cSrcSize` using `dt` into `dst` which must be already allocated. @return : size of regenerated data (necessarily <= `dstCapacity`), or an errorCode, which can be tested using FSE_isError() */ FSE_PUBLIC_API size_t FSE_decompress_usingDTable(void *dst, size_t dstCapacity, const void *cSrc, size_t cSrcSize, const FSE_DTable *dt); /*! Tutorial : ---------- (Note : these functions only decompress FSE-compressed blocks. If block is uncompressed, use memcpy() instead If block is a single repeated byte, use memset() instead ) The first step is to obtain the normalized frequencies of symbols. This can be performed by FSE_readNCount() if it was saved using FSE_writeNCount(). 'normalizedCounter' must be already allocated, and have at least 'maxSymbolValuePtr[0]+1' cells of signed short. In practice, that means it's necessary to know 'maxSymbolValue' beforehand, or size the table to handle worst case situations (typically 256). FSE_readNCount() will provide 'tableLog' and 'maxSymbolValue'. The result of FSE_readNCount() is the number of bytes read from 'rBuffer'. Note that 'rBufferSize' must be at least 4 bytes, even if useful information is less than that.


context:
space:
mode: