mirror of
https://github.com/wolfpld/tracy.git
synced 2024-11-10 10:41:50 +00:00
96 lines
4.4 KiB
C
96 lines
4.4 KiB
C
/* ******************************************************************
|
|
hist : Histogram functions
|
|
part of Finite State Entropy project
|
|
Copyright (C) 2013-present, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
|
|
- Public forum : https://groups.google.com/forum/#!forum/lz4c
|
|
****************************************************************** */
|
|
|
|
/* --- dependencies --- */
|
|
#include <stddef.h> /* size_t */
|
|
|
|
|
|
/* --- simple histogram functions --- */
|
|
|
|
/*! HIST_count():
|
|
* Provides the precise count of each byte within a table 'count'.
|
|
* 'count' is a table of unsigned int, of minimum size (*maxSymbolValuePtr+1).
|
|
* Updates *maxSymbolValuePtr with actual largest symbol value detected.
|
|
* @return : count of the most frequent symbol (which isn't identified).
|
|
* or an error code, which can be tested using HIST_isError().
|
|
* note : if return == srcSize, there is only one symbol.
|
|
*/
|
|
size_t HIST_count(unsigned* count, unsigned* maxSymbolValuePtr,
|
|
const void* src, size_t srcSize);
|
|
|
|
unsigned HIST_isError(size_t code); /**< tells if a return value is an error code */
|
|
|
|
|
|
/* --- advanced histogram functions --- */
|
|
|
|
#define HIST_WKSP_SIZE_U32 1024
|
|
#define HIST_WKSP_SIZE (HIST_WKSP_SIZE_U32 * sizeof(unsigned))
|
|
/** HIST_count_wksp() :
|
|
* Same as HIST_count(), but using an externally provided scratch buffer.
|
|
* Benefit is this function will use very little stack space.
|
|
* `workSpace` is a writable buffer which must be 4-bytes aligned,
|
|
* `workSpaceSize` must be >= HIST_WKSP_SIZE
|
|
*/
|
|
size_t HIST_count_wksp(unsigned* count, unsigned* maxSymbolValuePtr,
|
|
const void* src, size_t srcSize,
|
|
void* workSpace, size_t workSpaceSize);
|
|
|
|
/** HIST_countFast() :
|
|
* same as HIST_count(), but blindly trusts that all byte values within src are <= *maxSymbolValuePtr.
|
|
* This function is unsafe, and will segfault if any value within `src` is `> *maxSymbolValuePtr`
|
|
*/
|
|
size_t HIST_countFast(unsigned* count, unsigned* maxSymbolValuePtr,
|
|
const void* src, size_t srcSize);
|
|
|
|
/** HIST_countFast_wksp() :
|
|
* Same as HIST_countFast(), but using an externally provided scratch buffer.
|
|
* `workSpace` is a writable buffer which must be 4-bytes aligned,
|
|
* `workSpaceSize` must be >= HIST_WKSP_SIZE
|
|
*/
|
|
size_t HIST_countFast_wksp(unsigned* count, unsigned* maxSymbolValuePtr,
|
|
const void* src, size_t srcSize,
|
|
void* workSpace, size_t workSpaceSize);
|
|
|
|
/*! HIST_count_simple() :
|
|
* Same as HIST_countFast(), this function is unsafe,
|
|
* and will segfault if any value within `src` is `> *maxSymbolValuePtr`.
|
|
* It is also a bit slower for large inputs.
|
|
* However, it does not need any additional memory (not even on stack).
|
|
* @return : count of the most frequent symbol.
|
|
* Note this function doesn't produce any error (i.e. it must succeed).
|
|
*/
|
|
unsigned HIST_count_simple(unsigned* count, unsigned* maxSymbolValuePtr,
|
|
const void* src, size_t srcSize);
|