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comparison OrthancFramework/Sources/SystemToolbox.cpp @ 4342:52166629239f

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SystemToolbox::ReadFileRange()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 03 Dec 2020 18:48:06 +0100
parents 785a2713323e
children 80fd140b12ba
comparison
equal deleted inserted replaced
4341:977c2759eb0a 4342:52166629239f
222 log); 222 log);
223 } 223 }
224 224
225 std::streamsize size = GetStreamSize(f); 225 std::streamsize size = GetStreamSize(f);
226 content.resize(static_cast<size_t>(size)); 226 content.resize(static_cast<size_t>(size));
227
228 if (static_cast<std::streamsize>(content.size()) != size)
229 {
230 throw OrthancException(ErrorCode_InternalError,
231 "Reading a file that is too large for a 32bit architecture");
232 }
233
227 if (size != 0) 234 if (size != 0)
228 { 235 {
229 f.read(&content[0], size); 236 f.read(&content[0], size);
230 } 237 }
231 238
805 else 812 else
806 { 813 {
807 return (base / relative).string(); 814 return (base / relative).string();
808 } 815 }
809 } 816 }
817
818
819 void SystemToolbox::ReadFileRange(std::string& content,
820 const std::string& path,
821 uint64_t start, // Inclusive
822 uint64_t end, // Exclusive
823 bool throwIfOverflow)
824 {
825 if (start > end)
826 {
827 throw OrthancException(ErrorCode_ParameterOutOfRange);
828 }
829
830 if (!IsRegularFile(path))
831 {
832 throw OrthancException(ErrorCode_RegularFileExpected,
833 "The path does not point to a regular file: " + path);
834 }
835
836 boost::filesystem::ifstream f;
837 f.open(path, std::ifstream::in | std::ifstream::binary);
838 if (!f.good())
839 {
840 throw OrthancException(ErrorCode_InexistentFile,
841 "File not found: " + path);
842 }
843
844 uint64_t fileSize = static_cast<uint64_t>(GetStreamSize(f));
845 if (end > fileSize)
846 {
847 if (throwIfOverflow)
848 {
849 throw OrthancException(ErrorCode_ParameterOutOfRange,
850 "Reading beyond the end of a file");
851 }
852 else
853 {
854 end = fileSize;
855 }
856 }
857
858 if (start <= end)
859 {
860 content.resize(static_cast<size_t>(end - start));
861
862 if (static_cast<uint64_t>(content.size()) != (end - start))
863 {
864 throw OrthancException(ErrorCode_InternalError,
865 "Reading a file that is too large for a 32bit architecture");
866 }
867
868 if (!content.empty())
869 {
870 f.seekg(start, std::ios::beg);
871 f.read(&content[0], static_cast<std::streamsize>(content.size()));
872 }
873 }
874 else
875 {
876 content.clear();
877 }
878
879 f.close();
880 }
810 } 881 }