assimp/code/STEPFileEncoding.cpp

/*
Open Asset Import Library (assimp)
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*/

/** @file  STEPFileEncoding.cpp
 *  @brief STEP character handling, string unescaping
 */
#include "AssimpPCH.h"
#include "STEPFileEncoding.h"
#include "fast_atof.h"

#include "../contrib/ConvertUTF/ConvertUTF.h"

using namespace Assimp;

// roman1 to utf16 table
static const UTF16 mac_codetable[] = {
	// 0x20 unassig./nonprint. slots
	 0x0020	,
	 0x0021	,
	 0x0022	,
	 0x0023	,
	 0x0024	,
	 0x0025	,
	 0x0026	,
	 0x0027	,
	 0x0028	,
	 0x0029	,
	 0x002A	,
	 0x002B	,
	 0x002C	,
	 0x002D	,
	 0x002E	,
	 0x002F	,
	 0x0030	,
	 0x0031	,
	 0x0032	,
	 0x0033	,
	 0x0034	,
	 0x0035	,
	 0x0036	,
	 0x0037	,
	 0x0038	,
	 0x0039	,
	 0x003A	,
	 0x003B	,
	 0x003C	,
	 0x003D	,
	 0x003E	,
	 0x003F	,
	 0x0040	,
	 0x0041	,
	 0x0042	,
	 0x0043	,
	 0x0044	,
	 0x0045	,
	 0x0046	,
	 0x0047	,
	 0x0048	,
	 0x0049	,
	 0x004A	,
	 0x004B	,
	 0x004C	,
	 0x004D	,
	 0x004E	,
	 0x004F	,
	 0x0050	,
	 0x0051	,
	 0x0052	,
	 0x0053	,
	 0x0054	,
	 0x0055	,
	 0x0056	,
	 0x0057	,
	 0x0058	,
	 0x0059	,
	 0x005A	,
	 0x005B	,
	 0x005C	,
	 0x005D	,
	 0x005E	,
	 0x005F	,
	 0x0060	,
	 0x0061	,
	 0x0062	,
	 0x0063	,
	 0x0064	,
	 0x0065	,
	 0x0066	,
	 0x0067	,
	 0x0068	,
	 0x0069	,
	 0x006A	,
	 0x006B	,
	 0x006C	,
	 0x006D	,
	 0x006E	,
	 0x006F	,
	 0x0070	,
	 0x0071	,
	 0x0072	,
	 0x0073	,
	 0x0074	,
	 0x0075	,
	 0x0076	,
	 0x0077	,
	 0x0078	,
	 0x0079	,
	 0x007A	,
	 0x007B	,
	 0x007C	,
	 0x007D	,
	 0x007E	,
	 0x0000 , // unassig.
	 0x00C4	,
	 0x00C5	,
	 0x00C7	,
	 0x00C9	,
	 0x00D1	,
	 0x00D6	,
	 0x00DC	,
	 0x00E1	,
	 0x00E0	,
	 0x00E2	,
	 0x00E4	,
	 0x00E3	,
	 0x00E5	,
	 0x00E7	,
	 0x00E9	,
	 0x00E8	,
	 0x00EA	,
	 0x00EB	,
	 0x00ED	,
	 0x00EC	,
	 0x00EE	,
	 0x00EF	,
	 0x00F1	,
	 0x00F3	,
	 0x00F2	,
	 0x00F4	,
	 0x00F6	,
	 0x00F5	,
	 0x00FA	,
	 0x00F9	,
	 0x00FB	,
	 0x00FC	,
	 0x2020	,
	 0x00B0	,
	 0x00A2	,
	 0x00A3	,
	 0x00A7	,
	 0x2022	,
	 0x00B6	,
	 0x00DF	,
	 0x00AE	,
	 0x00A9	,
	 0x2122	,
	 0x00B4	,
	 0x00A8	,
	 0x2260	,
	 0x00C6	,
	 0x00D8	,
	 0x221E	,
	 0x00B1	,
	 0x2264	,
	 0x2265	,
	 0x00A5	,
	 0x00B5	,
	 0x2202	,
	 0x2211	,
	 0x220F	,
	 0x03C0	,
	 0x222B	,
	 0x00AA	,
	 0x00BA	,
	 0x03A9	,
	 0x00E6	,
	 0x00F8	,
	 0x00BF	,
	 0x00A1	,
	 0x00AC	,
	 0x221A	,
	 0x0192	,
	 0x2248	,
	 0x2206	,
	 0x00AB	,
	 0x00BB	,
	 0x2026	,
	 0x00A0	,
	 0x00C0	,
	 0x00C3	,
	 0x00D5	,
	 0x0152	,
	 0x0153	,
	 0x2013	,
	 0x2014	,
	 0x201C	,
	 0x201D	,
	 0x2018	,
	 0x2019	,
	 0x00F7	,
	 0x25CA	,
	 0x00FF	,
	 0x0178	,
	 0x2044	,
	 0x20AC	,
	 0x2039	,
	 0x203A	,
	 0xFB01	,
	 0xFB02	,
	 0x2021	,
	 0x00B7	,
	 0x201A	,
	 0x201E	,
	 0x2030	,
	 0x00C2	,
	 0x00CA	,
	 0x00C1	,
	 0x00CB	,
	 0x00C8	,
	 0x00CD	,
	 0x00CE	,
	 0x00CF	,
	 0x00CC	,
	 0x00D3	,
	 0x00D4	,
	 0xF8FF	,
	 0x00D2	,
	 0x00DA	,
	 0x00DB	,
	 0x00D9	,
	 0x0131	,
	 0x02C6	,
	 0x02DC	,
	 0x00AF	,
	 0x02D8	,
	 0x02D9	,
	 0x02DA	,
	 0x00B8	,
	 0x02DD	,
	 0x02DB	,
	 0x02C7
};

// ------------------------------------------------------------------------------------------------
bool STEP::StringToUTF8(std::string& s) 
{
	// very basic handling for escaped string sequences
	// http://doc.spatial.com/index.php?title=InterOp:Connect/STEP&redirect=no
	
	for (size_t i = 0; i < s.size(); ) {
		if (s[i] == '\\') {
			// \S\X - cp1252 (X is the character remapped to [0,127])
			if (i+3 < s.size() && s[i+1] == 'S' && s[i+2] == '\\') {
				// http://stackoverflow.com/questions/5586214/how-to-convert-char-from-iso-8859-1-to-utf-8-in-c-multiplatformly
				ai_assert((uint8_t)s[i+3] < 0x80);
				const uint8_t ch = s[i+3] + 0x80;

				s[i] = 0xc0 | (ch & 0xc0) >> 6;
				s[i+1] =  0x80 | (ch & 0x3f);

				s.erase(i + 2,2);
				++i;
			}
			// \X\xx - mac/roman (xx is a hex sequence)
			else if (i+4 < s.size() && s[i+1] == 'X' && s[i+2] == '\\') {
				
				const uint8_t macval = HexOctetToDecimal(s.c_str() + i + 3);
				if(macval < 0x20) {
					return false;
				}

				ai_assert(sizeof(mac_codetable) / sizeof(mac_codetable[0]) == 0x100-0x20);

				const UTF32 unival = mac_codetable[macval - 0x20], *univalp = &unival;

				UTF8 temp[5], *tempp = temp;
				ai_assert(sizeof(UTF8) == 1);

				if(ConvertUTF32toUTF8(&univalp, univalp+1, &tempp, tempp+sizeof(temp), lenientConversion) != conversionOK) {
					return false;
				}

				const size_t outcount = static_cast<size_t>(tempp-temp);

				s.erase(i,5);
				s.insert(i, reinterpret_cast<char*>(temp), outcount);
				i += outcount;
			}
			// \Xn\ .. \X0\ - various unicode encodings (n=2: utf16; n=4: utf32)
			else if (i+3 < s.size() && s[i+1] == 'X' && s[i+2] >= '0' && s[i+2] <= '9') {
				switch(s[i+2]) {
					// utf16
				case '2':
					// utf32
				case '4':						
					if (s[i+3] == '\\') {
						const size_t basei = i+4;
						// scan for \X0\ 
						size_t j = basei, jend = s.size()-4;
						for (; j < jend; ++j) {
							if (s[j] == '\\' && s[j] == 'X' && s[j] == '0' && s[j] == '\\') {
								break;
							}
						}
						if (j == jend) {						
							return false;
						}

						if (j == basei) {
							s.erase(i,8);
							continue;
						}
						
						if (s[i+2] == '2') {
							if (((j - basei) % 4) != 0) {
								return false;
							}
							
							const size_t count = (j-basei)/4;
							boost::scoped_array<UTF16> src = boost::scoped_array<UTF16>(new UTF16[count]);

							const char* cur = s.c_str() + basei;
							for (size_t k = 0; k < count; ++k, cur += 4) {
								src[k] = (static_cast<UTF16>(HexOctetToDecimal(cur)) << 8u)  |
									 static_cast<UTF16>(HexOctetToDecimal(cur+2));
							}

							const size_t dcount = count * 3; // this is enough to hold all possible outputs
							boost::scoped_array<UTF8> dest = boost::scoped_array<UTF8>(new UTF8[dcount]);

							const UTF16* srct = src.get();
							UTF8* destt = dest.get();
							if(ConvertUTF16toUTF8(&srct, srct+count, &destt, destt+dcount, lenientConversion) != conversionOK) {
								return false;
							}

							const size_t outcount = static_cast<size_t>(destt-dest.get());

							s.erase(i,(j+4-i));

							ai_assert(sizeof(UTF8) == 1);
							s.insert(i, reinterpret_cast<char*>(dest.get()), outcount);

							i += outcount;
							continue;
						}
						else if (s[i+2] == '4') {
							if (((j - basei) % 8) != 0) {
								return false;
							}

							const size_t count = (j-basei)/8;
							boost::scoped_array<UTF32> src = boost::scoped_array<UTF32>(new UTF32[count]);

							const char* cur = s.c_str() + basei;
							for (size_t k = 0; k < count; ++k, cur += 8) {
								src[k] = (static_cast<UTF32>(HexOctetToDecimal(cur  )) << 24u) |
									     (static_cast<UTF32>(HexOctetToDecimal(cur+2)) << 16u) |
										 (static_cast<UTF32>(HexOctetToDecimal(cur+4)) << 8u)  |
									     (static_cast<UTF32>(HexOctetToDecimal(cur+6)));
							}

							const size_t dcount = count * 5; // this is enough to hold all possible outputs
							boost::scoped_array<UTF8> dest = boost::scoped_array<UTF8>(new UTF8[dcount]);

							const UTF32* srct = src.get();
							UTF8* destt = dest.get();
							if(ConvertUTF32toUTF8(&srct, srct+count, &destt, destt+dcount, lenientConversion) != conversionOK) {
								return false;
							}

							const size_t outcount = static_cast<size_t>(destt-dest.get());

							s.erase(i,(j+4-i));

							ai_assert(sizeof(UTF8) == 1);
							s.insert(i, reinterpret_cast<char*>(dest.get()), outcount);

							i += outcount;
							continue;
						}
					}				

					break;
					
					// TODO: other encoding patterns?

				default:
					return false;
				}
			}
		}
		++i;
	}
	return true;
}