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90 lines
1.7 KiB
C++
90 lines
1.7 KiB
C++
/*
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* Unicode manipulation functions
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*
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* by WangLu
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* 2012.11.29
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*/
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#include <iostream>
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#include <GlobalParams.h>
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#include "unicode.h"
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namespace pdf2htmlEX {
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using std::cerr;
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using std::endl;
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using std::ostream;
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bool isLegalUnicode(Unicode u)
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{
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/*
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if((u == 9) || (u == 10) || (u == 13))
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return true;
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*/
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if(u <= 31)
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return false;
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if((u >= 127) && (u <= 159))
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return false;
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if((u >= 0xd800) && (u <= 0xdfff))
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return false;
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return true;
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}
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Unicode map_to_private(CharCode code)
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{
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Unicode private_mapping = (Unicode)(code + 0xE000);
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if(private_mapping > 0xF8FF)
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{
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private_mapping = (Unicode)((private_mapping - 0xF8FF) + 0xF0000);
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if(private_mapping > 0xFFFFD)
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{
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private_mapping = (Unicode)((private_mapping - 0xFFFFD) + 0x100000);
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if(private_mapping > 0x10FFFD)
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{
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cerr << "Warning: all private use unicode are used" << endl;
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}
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}
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}
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return private_mapping;
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}
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Unicode unicode_from_font (CharCode code, GfxFont * font)
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{
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if(!font->isCIDFont())
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{
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char * cname = dynamic_cast<Gfx8BitFont*>(font)->getCharName(code);
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// may be untranslated ligature
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if(cname)
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{
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Unicode ou = globalParams->mapNameToUnicode(cname);
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if(isLegalUnicode(ou))
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return ou;
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}
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}
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return map_to_private(code);
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}
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Unicode check_unicode(Unicode * u, int len, CharCode code, GfxFont * font)
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{
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if(len == 0)
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return map_to_private(code);
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if(len == 1)
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{
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if(isLegalUnicode(*u))
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return *u;
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}
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return unicode_from_font(code, font);
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}
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} //namespace pdf2htmlEX
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