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44 lines
1.0 KiB
C++
44 lines
1.0 KiB
C++
// ***************************************************************** -*- C++ -*-
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// mmap-test.cpp, $Rev$
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// Simple mmap tests
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#include <exiv2/basicio.hpp>
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#include <exiv2/error.hpp>
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#include <exiv2/futils.hpp>
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#include <iostream>
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#include <cstring>
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using namespace Exiv2;
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int main(int argc, char* const argv[])
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try {
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if (argc != 2) {
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std::cout << "Usage: " << argv[0] << " file\n";
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return 1;
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}
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const char* path = argv[1];
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FileIo file(path);
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// Open the file in read mode
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if (file.open("rb") != 0) {
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throw Error(10, path, "rb", strError());
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}
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// Map it to memory
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const byte* pData = file.mmap();
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long size = file.size();
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DataBuf buf(size);
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// Read from the memory mapped region
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memcpy(buf.pData_, pData, buf.size_);
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// Reopen file in write mode and write to it
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file.write(buf.pData_, buf.size_);
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// Read from the mapped region again
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memcpy(buf.pData_, pData, buf.size_);
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file.close();
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return 0;
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}
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catch (const AnyError& e) {
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std::cout << e << "\n";
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}
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