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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@945 d0cd1f9f-072b-0410-8dd7-cf729c803f20
84 lines
3.5 KiB
C++
84 lines
3.5 KiB
C++
/**********************************************************************
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* File: cube_utils.h
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* Description: Declaration of the Cube Utilities Class
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* Author: Ahmad Abdulkader
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* Created: 2008
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*
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*(C) Copyright 2008, Google Inc.
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** Licensed under the Apache License, Version 2.0(the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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// The CubeUtils class provides miscellaneous utility and helper functions
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// to the rest of the Cube Engine
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#ifndef CUBE_UTILS_H
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#define CUBE_UTILS_H
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#include <vector>
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#include <string>
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#include "allheaders.h"
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#include "const.h"
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#include "char_set.h"
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#include "char_samp.h"
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namespace tesseract {
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class CubeUtils {
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public:
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CubeUtils();
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~CubeUtils();
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// Converts a probability value to a cost by getting the -log() of the
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// probability value to a known base
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static int Prob2Cost(double prob_val);
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// Converts a cost to probability by getting the exp(-normalized cost)
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static double Cost2Prob(int cost);
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// Computes the length of a 32-bit char buffer
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static int StrLen(const char_32 *str);
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// Compares two 32-bit char buffers
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static int StrCmp(const char_32 *str1, const char_32 *str2);
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// Duplicates a 32-bit char buffer
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static char_32 *StrDup(const char_32 *str);
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// Creates a CharSamp from an Pix and a bounding box
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static CharSamp *CharSampleFromPix(Pix *pix,
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int left, int top, int wid, int hgt);
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// Creates a Pix from a CharSamp
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static Pix *PixFromCharSample(CharSamp *char_samp);
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// read the contents of a file to a string
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static bool ReadFileToString(const string &file_name, string *str);
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// split a string into vectors using any of the specified delimiters
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static void SplitStringUsing(const string &str, const string &delims,
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vector<string> *str_vec);
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// UTF-8 to UTF-32 convesion functions
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static void UTF8ToUTF32(const char *utf8_str, string_32 *str32);
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static void UTF32ToUTF8(const char_32 *utf32_str, string *str);
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// Returns true if input word has either 1) all-one-case, or 2)
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// first character upper-case, and remaining characters lower-case.
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// If char_set is not NULL, uses tesseract's unicharset functions
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// to determine case properties. Otherwise, uses C-locale-dependent
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// functions, which may be unreliable on non-ASCII characters.
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static bool IsCaseInvariant(const char_32 *str32, CharSet *char_set);
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// Returns char_32 pointer to the lower-case-transformed version of
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// the input string or NULL on error. If char_set is NULL returns NULL.
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// Return array must be freed by caller.
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static char_32 *ToLower(const char_32 *str32, CharSet *char_set);
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// Returns char_32 pointer to the upper-case-transformed version of
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// the input string or NULL on error. If char_set is NULL returns NULL.
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// Return array must be freed by caller.
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static char_32 *ToUpper(const char_32 *str32, CharSet *char_set);
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private:
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static unsigned char *GetImageData(Pix *pix,
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int left, int top, int wid, int hgt);
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};
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} // namespace tesseract
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#endif // CUBE_UTILS_H
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