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1834
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20
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21 #include "GdcmDecoderCache.h"
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22
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23 #include "OrthancImageWrapper.h"
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24
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25 namespace OrthancPlugins
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26 {
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27 std::string GdcmDecoderCache::ComputeMd5(OrthancPluginContext* context,
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28 const void* dicom,
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29 size_t size)
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30 {
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31 std::string result;
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32
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33 char* md5 = OrthancPluginComputeMd5(context, dicom, size);
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34
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35 if (md5 == NULL)
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36 {
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37 throw std::runtime_error("Cannot compute MD5 hash");
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38 }
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39
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40 bool ok = false;
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41 try
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42 {
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43 result.assign(md5);
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44 ok = true;
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45 }
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46 catch (...)
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47 {
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48 }
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49
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50 OrthancPluginFreeString(context, md5);
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51
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52 if (!ok)
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53 {
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54 throw std::runtime_error("Not enough memory");
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55 }
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56 else
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57 {
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58 return result;
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59 }
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60 }
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61
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62
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63 OrthancPluginImage* GdcmDecoderCache::Decode(OrthancPluginContext* context,
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64 const void* dicom,
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65 const uint32_t size,
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66 uint32_t frameIndex)
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67 {
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68 std::string md5 = ComputeMd5(context, dicom, size);
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69
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70 // First check whether the previously decoded image is the same
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71 // as this one
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72 {
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73 boost::mutex::scoped_lock lock(mutex_);
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74
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75 if (decoder_.get() != NULL &&
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76 size_ == size &&
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77 md5_ == md5)
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78 {
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79 // This is the same image: Reuse the previous decoding
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80 return decoder_->Decode(context, frameIndex);
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81 }
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82 }
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83
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84 // This is not the same image
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85 std::auto_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size));
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86 OrthancImageWrapper image(context, decoder->Decode(context, frameIndex));
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87
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88 {
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89 // Cache the newly created decoder for further use
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90 boost::mutex::scoped_lock lock(mutex_);
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91 decoder_ = decoder;
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92 size_ = size;
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93 md5_ = md5;
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94 }
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95
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96 return image.Release();
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97 }
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98 }
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