Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/viewer/svutil.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: svutil.h
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3 // Description: ScrollView Utilities
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4 // Author: Joern Wanke
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5 //
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6 // (C) Copyright 2007, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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18 //
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19 // SVUtil contains the SVSync, SVSemaphore and SVNetwork
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20 // classes, which are used for thread/process creation & synchronization
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21 // and network connection.
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23 #ifndef TESSERACT_VIEWER_SVUTIL_H_
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24 #define TESSERACT_VIEWER_SVUTIL_H_
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25
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26 #ifdef _WIN32
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27 # include "host.h" // also includes windows.h
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28 #else
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29 # include <semaphore.h>
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30 #endif
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31
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32 #include <mutex>
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33 #include <string>
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34
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35 namespace tesseract {
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36
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37 /// The SVSync class provides functionality for Thread & Process Creation
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38 class SVSync {
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39 public:
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40 /// Starts a new process.
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41 static void StartProcess(const char *executable, const char *args);
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42 };
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43
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44 /// A semaphore class which encapsulates the main signaling
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45 /// and wait abilities of semaphores for windows and unix.
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46 class SVSemaphore {
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47 public:
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48 /// Sets up a semaphore.
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49 SVSemaphore();
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50 /// Cleans up the mutex
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51 ~SVSemaphore();
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52 /// Signal a semaphore.
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53 void Signal();
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54 /// Wait on a semaphore.
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55 void Wait();
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56
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57 private:
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58 #ifdef _WIN32
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59 HANDLE semaphore_;
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60 #elif defined(__APPLE__)
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61 sem_t *semaphore_;
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62 #else
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63 sem_t semaphore_;
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64 #endif
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65 };
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66
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67 /// The SVNetwork class takes care of the remote connection for ScrollView
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68 /// This means setting up and maintaining a remote connection, sending and
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69 /// receiving messages and closing the connection.
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70 /// It is designed to work on both Linux and Windows.
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71 class SVNetwork {
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72 public:
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73 /// Set up a connection to hostname on port.
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74 SVNetwork(const char *hostname, int port);
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75
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76 /// Destructor.
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77 ~SVNetwork();
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78
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79 /// Put a message in the messagebuffer to the server and try to send it.
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80 void Send(const char *msg);
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81
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82 /// Receive a message from the server.
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83 /// This will always return one line of char* (denoted by \\n).
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84 char *Receive();
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85
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86 /// Close the connection to the server.
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87 void Close();
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88
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89 /// Flush the buffer.
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90 void Flush();
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91
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92 private:
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93 /// The mutex for access to Send() and Flush().
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94 std::mutex mutex_send_;
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95 /// The actual stream_ to the server.
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96 int stream_;
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97 /// Stores the last received message-chunk from the server.
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98 char *msg_buffer_in_;
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99
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100 /// Stores the messages which are supposed to go out.
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101 std::string msg_buffer_out_;
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102
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103 /// Where we are at in our msg_buffer_in_
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104 char *buffer_ptr_; // strtok_r, strtok_s
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105 };
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107 } // namespace tesseract
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109 #endif // TESSERACT_VIEWER_SVUTIL_H_