58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
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#include "streams.h"
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#include "exceptions.h"
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#include "unicode.h"
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UtfStreamReader::UtfStreamReader(std::ifstream *s)
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{
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stream = s;
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}
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UtfStreamReader::~UtfStreamReader()
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{
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}
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// This function is very slow because of poor fromUtf8 function design
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wchar_t UtfStreamReader::getNextChar()
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{
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unsigned char buf[10];
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if (0 < backBuf.size()) {
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wchar_t wc = backBuf.front();
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backBuf.pop_front();
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return wc;
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}
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if (! stream->good())
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throw Exception(L"Error reading from stream 1");
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int sz = stream->readsome((char*)buf, 1);
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if (1 != sz)
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throw Exception(L"Error reading from stream 2");
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int size = getUtf8Length(buf[0]);
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if (size > 1) {
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sz = stream->readsome((char*)buf + 1, size - 1);
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if (size - 1 != sz)
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throw Exception(L"Error reading from stream 3");
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}
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buf[size] = 0;
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std::string s((char*)buf);
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std::wstring ws(fromUtf8(s));
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if (1 != ws.length())
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throw Exception(L"Error converting UTF-8 character to wide character");
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return ws[0];
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}
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void UtfStreamReader::ungetChar(wchar_t ch)
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{
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backBuf.push_back(ch);
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}
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bool UtfStreamReader::isEof()
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{
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if (stream->eof())
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return true; // FIXME: it doesn't work. why?
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return EOF == stream->peek();
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}
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