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static const char hexit[]= { '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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string::const_iterator src_iter;
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for (src_iter= src.begin(); src_iter < src.end(); ++src_iter)
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if (static_cast<unsigned char>(*src_iter) > 0x7f)