57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
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#include "UTF8DocumentIterator.h"
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void UTF8DocumentIterator::readCharacter()
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{
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unsigned char currentChar = m_doc->CharAt(m_pos);
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if (currentChar & 0x80)
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{
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int mask = 0x40;
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int nBytes = 1;
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do
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{
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mask >>= 1;
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++nBytes;
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} while (currentChar & mask);
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int result = currentChar & m_firstByteMask[nBytes];
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int pos = m_pos;
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m_utf8Length = 1;
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// work out the unicode point, and count the actual bytes.
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// If a byte does not start with 10xxxxxx then it's not part of the
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// the code. Therefore invalid UTF-8 encodings are dealt with, simply by stopping when
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// the UTF8 extension bytes are no longer valid.
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while ((--nBytes) && (pos < m_end) && (0x80 == ((currentChar = m_doc->CharAt(++pos)) & 0xC0)))
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{
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result = (result << 6) | (currentChar & 0x3F);
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++m_utf8Length;
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}
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if (result >= 0x10000)
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{
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result -= 0x10000;
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m_utf16Length = 2;
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// UTF-16 Pair
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m_character[0] = 0xD800 + (result >> 10);
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m_character[1] = 0xDC00 + (result & 0x3FF);
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}
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else
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{
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m_utf16Length = 1;
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m_character[0] = static_cast<wchar_t>(result);
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}
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}
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else
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{
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m_utf8Length = 1;
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m_utf16Length = 1;
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m_characterIndex = 0;
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m_character[0] = static_cast<wchar_t>(currentChar);
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}
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}
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const unsigned char UTF8DocumentIterator::m_firstByteMask[7] = { 0x7F, 0x3F, 0x1F, 0x0F, 0x07, 0x03, 0x01 };
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