mirror of
https://github.com/reactos/CMake.git
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56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing#kwsys for details. */
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#include "kwsysPrivate.h"
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#include KWSYS_HEADER(FStream.hxx)
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// Work-around CMake dependency scanning limitation. This must
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// duplicate the above list of headers.
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#if 0
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#include "FStream.hxx.in"
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#endif
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namespace KWSYS_NAMESPACE {
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namespace FStream {
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BOM ReadBOM(std::istream& in)
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{
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if (!in.good()) {
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return BOM_None;
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}
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unsigned long orig = in.tellg();
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unsigned char bom[4];
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in.read(reinterpret_cast<char*>(bom), 2);
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if (!in.good()) {
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in.clear();
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in.seekg(orig);
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return BOM_None;
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}
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if (bom[0] == 0xEF && bom[1] == 0xBB) {
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in.read(reinterpret_cast<char*>(bom + 2), 1);
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if (in.good() && bom[2] == 0xBF) {
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return BOM_UTF8;
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}
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} else if (bom[0] == 0xFE && bom[1] == 0xFF) {
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return BOM_UTF16BE;
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} else if (bom[0] == 0x00 && bom[1] == 0x00) {
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in.read(reinterpret_cast<char*>(bom + 2), 2);
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if (in.good() && bom[2] == 0xFE && bom[3] == 0xFF) {
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return BOM_UTF32BE;
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}
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} else if (bom[0] == 0xFF && bom[1] == 0xFE) {
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unsigned long p = in.tellg();
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in.read(reinterpret_cast<char*>(bom + 2), 2);
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if (in.good() && bom[2] == 0x00 && bom[3] == 0x00) {
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return BOM_UTF32LE;
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}
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in.seekg(p);
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return BOM_UTF16LE;
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}
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in.clear();
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in.seekg(orig);
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return BOM_None;
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}
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} // FStream namespace
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} // KWSYS_NAMESPACE
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