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char_samp_set.h
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1 /**********************************************************************
2 * File: char_samp_set.h
3 * Description: Declaration of a Character Sample Set Class
4 * Author: Ahmad Abdulkader
5 * Created: 2007
6 *
7 * (C) Copyright 2008, Google Inc.
8 ** Licensed under the Apache License, Version 2.0 (the "License");
9 ** you may not use this file except in compliance with the License.
10 ** You may obtain a copy of the License at
11 ** http://www.apache.org/licenses/LICENSE-2.0
12 ** Unless required by applicable law or agreed to in writing, software
13 ** distributed under the License is distributed on an "AS IS" BASIS,
14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 ** See the License for the specific language governing permissions and
16 ** limitations under the License.
17 *
18 **********************************************************************/
19
20 // The CharSampSet set encapsulates a set of CharSet objects typically
21 // but not necessarily loaded from a file
22 // It provides methods to load samples from File, Create a new file and
23 // Add new char samples to the set
24
25 #ifndef CHAR_SAMP_SET_H
26 #define CHAR_SAMP_SET_H
27
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <string>
31 #include "char_samp.h"
32 #include "char_samp_enum.h"
33 #include "char_set.h"
34
35 namespace tesseract {
36
37 // chunks of samp pointers to allocate
38 #define SAMP_ALLOC_BLOCK 10000
39
40 class CharSampSet {
41 public:
42 CharSampSet();
43 ~CharSampSet();
44 // return sample count
45 int SampleCount() const { return cnt_; }
46 // returns samples buffer
47 CharSamp ** Samples() const { return samp_buff_; }
48 // Create a CharSampSet set object from a file
49 static CharSampSet *FromCharDumpFile(string file_name);
50 // Enumerate the Samples in the set one-by-one calling the enumertor's
51 // EnumCharSamp method for each sample
52 static bool EnumSamples(string file_name, CharSampEnum *enumerator);
53 // Create a new Char Dump file
54 static FILE *CreateCharDumpFile(string file_name);
55 // Add a new sample to the set
56 bool Add(CharSamp *char_samp);
57
58 private:
59 // sample count
60 int cnt_;
61 // the char samp array
62 CharSamp **samp_buff_;
63 // Are the samples owned by the set or not.
64 // Determines whether we should cleanup in the end
65 bool own_samples_;
66 // Cleanup
67 void Cleanup();
68 // Load character samples from a file
69 bool LoadCharSamples(FILE *fp);
70 };
71 }
72
73 #endif // CHAR_SAMP_SET_H