diff options
Diffstat (limited to 'test/API/driver/kwsys/FStream.cxx')
-rw-r--r-- | test/API/driver/kwsys/FStream.cxx | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/test/API/driver/kwsys/FStream.cxx b/test/API/driver/kwsys/FStream.cxx new file mode 100644 index 0000000..5e4133a --- /dev/null +++ b/test/API/driver/kwsys/FStream.cxx @@ -0,0 +1,55 @@ +/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying + file Copyright.txt or https://cmake.org/licensing#kwsys for details. */ +#include "kwsysPrivate.h" +#include KWSYS_HEADER(FStream.hxx) + +// Work-around CMake dependency scanning limitation. This must +// duplicate the above list of headers. +#if 0 +# include "FStream.hxx.in" +#endif + +namespace KWSYS_NAMESPACE { +namespace FStream { + +BOM ReadBOM(std::istream& in) +{ + if (!in.good()) { + return BOM_None; + } + unsigned long orig = in.tellg(); + unsigned char bom[4]; + in.read(reinterpret_cast<char*>(bom), 2); + if (!in.good()) { + in.clear(); + in.seekg(orig); + return BOM_None; + } + if (bom[0] == 0xEF && bom[1] == 0xBB) { + in.read(reinterpret_cast<char*>(bom + 2), 1); + if (in.good() && bom[2] == 0xBF) { + return BOM_UTF8; + } + } else if (bom[0] == 0xFE && bom[1] == 0xFF) { + return BOM_UTF16BE; + } else if (bom[0] == 0x00 && bom[1] == 0x00) { + in.read(reinterpret_cast<char*>(bom + 2), 2); + if (in.good() && bom[2] == 0xFE && bom[3] == 0xFF) { + return BOM_UTF32BE; + } + } else if (bom[0] == 0xFF && bom[1] == 0xFE) { + unsigned long p = in.tellg(); + in.read(reinterpret_cast<char*>(bom + 2), 2); + if (in.good() && bom[2] == 0x00 && bom[3] == 0x00) { + return BOM_UTF32LE; + } + in.seekg(p); + return BOM_UTF16LE; + } + in.clear(); + in.seekg(orig); + return BOM_None; +} + +} // FStream namespace +} // KWSYS_NAMESPACE |