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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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122
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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107
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4 * Department, University Hospital of Liege, Belgium
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175
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5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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107
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "GdcmDecoderCache.h"
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23
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24 #include "OrthancImageWrapper.h"
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25
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26 namespace OrthancPlugins
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27 {
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28 std::string GdcmDecoderCache::ComputeMd5(OrthancPluginContext* context,
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29 const void* dicom,
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30 size_t size)
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31 {
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32 std::string result;
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33
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34 char* md5 = OrthancPluginComputeMd5(context, dicom, size);
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35
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36 if (md5 == NULL)
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37 {
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38 throw std::runtime_error("Cannot compute MD5 hash");
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39 }
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40
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41 bool ok = false;
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42 try
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43 {
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44 result.assign(md5);
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45 ok = true;
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46 }
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47 catch (...)
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48 {
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49 }
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50
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51 OrthancPluginFreeString(context, md5);
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52
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53 if (!ok)
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54 {
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55 throw std::runtime_error("Not enough memory");
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56 }
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57 else
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58 {
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59 return result;
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60 }
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61 }
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62
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63
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64 OrthancImageWrapper* GdcmDecoderCache::Decode(OrthancPluginContext* context,
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65 const void* dicom,
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66 const uint32_t size,
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67 uint32_t frameIndex)
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68 {
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69 std::string md5 = ComputeMd5(context, dicom, size);
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70
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71 // First check whether the previously decoded image is the same
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72 // as this one
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73 {
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74 boost::mutex::scoped_lock lock(mutex_);
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75
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76 if (decoder_.get() != NULL &&
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77 size_ == size &&
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78 md5_ == md5)
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79 {
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80 // This is the same image: Reuse the previous decoding
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81 return new OrthancImageWrapper(context, decoder_->Decode(context, frameIndex));
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82 }
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83 }
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84
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85 // This is not the same image
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86 std::auto_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size));
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87 std::auto_ptr<OrthancImageWrapper> image(new OrthancImageWrapper(context, decoder->Decode(context, frameIndex)));
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88
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89 {
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90 // Cache the newly created decoder for further use
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91 boost::mutex::scoped_lock lock(mutex_);
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92 decoder_ = decoder;
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93 size_ = size;
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94 md5_ = md5;
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95 }
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96
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97 return image.release();
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98 }
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99 }
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