1249259Sdim//===-- ConvertUTFWrapper.cpp - Wrap ConvertUTF.h with clang data types -----=== 2249259Sdim// 3249259Sdim// The LLVM Compiler Infrastructure 4249259Sdim// 5249259Sdim// This file is distributed under the University of Illinois Open Source 6249259Sdim// License. See LICENSE.TXT for details. 7249259Sdim// 8249259Sdim//===----------------------------------------------------------------------===// 9249259Sdim 10249259Sdim#include "llvm/Support/ConvertUTF.h" 11263509Sdim#include "llvm/Support/SwapByteOrder.h" 12263509Sdim#include <string> 13263509Sdim#include <vector> 14249259Sdim 15249259Sdimnamespace llvm { 16249259Sdim 17249259Sdimbool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source, 18249259Sdim char *&ResultPtr, const UTF8 *&ErrorPtr) { 19249259Sdim assert(WideCharWidth == 1 || WideCharWidth == 2 || WideCharWidth == 4); 20249259Sdim ConversionResult result = conversionOK; 21249259Sdim // Copy the character span over. 22249259Sdim if (WideCharWidth == 1) { 23249259Sdim const UTF8 *Pos = reinterpret_cast<const UTF8*>(Source.begin()); 24249259Sdim if (!isLegalUTF8String(&Pos, reinterpret_cast<const UTF8*>(Source.end()))) { 25249259Sdim result = sourceIllegal; 26249259Sdim ErrorPtr = Pos; 27249259Sdim } else { 28249259Sdim memcpy(ResultPtr, Source.data(), Source.size()); 29249259Sdim ResultPtr += Source.size(); 30249259Sdim } 31249259Sdim } else if (WideCharWidth == 2) { 32249259Sdim const UTF8 *sourceStart = (const UTF8*)Source.data(); 33249259Sdim // FIXME: Make the type of the result buffer correct instead of 34249259Sdim // using reinterpret_cast. 35249259Sdim UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr); 36249259Sdim ConversionFlags flags = strictConversion; 37249259Sdim result = ConvertUTF8toUTF16( 38249259Sdim &sourceStart, sourceStart + Source.size(), 39249259Sdim &targetStart, targetStart + 2*Source.size(), flags); 40249259Sdim if (result == conversionOK) 41249259Sdim ResultPtr = reinterpret_cast<char*>(targetStart); 42249259Sdim else 43249259Sdim ErrorPtr = sourceStart; 44249259Sdim } else if (WideCharWidth == 4) { 45249259Sdim const UTF8 *sourceStart = (const UTF8*)Source.data(); 46249259Sdim // FIXME: Make the type of the result buffer correct instead of 47249259Sdim // using reinterpret_cast. 48249259Sdim UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr); 49249259Sdim ConversionFlags flags = strictConversion; 50249259Sdim result = ConvertUTF8toUTF32( 51249259Sdim &sourceStart, sourceStart + Source.size(), 52249259Sdim &targetStart, targetStart + 4*Source.size(), flags); 53249259Sdim if (result == conversionOK) 54249259Sdim ResultPtr = reinterpret_cast<char*>(targetStart); 55249259Sdim else 56249259Sdim ErrorPtr = sourceStart; 57249259Sdim } 58249259Sdim assert((result != targetExhausted) 59249259Sdim && "ConvertUTF8toUTFXX exhausted target buffer"); 60249259Sdim return result == conversionOK; 61249259Sdim} 62249259Sdim 63249259Sdimbool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr) { 64249259Sdim const UTF32 *SourceStart = &Source; 65249259Sdim const UTF32 *SourceEnd = SourceStart + 1; 66249259Sdim UTF8 *TargetStart = reinterpret_cast<UTF8 *>(ResultPtr); 67249259Sdim UTF8 *TargetEnd = TargetStart + 4; 68249259Sdim ConversionResult CR = ConvertUTF32toUTF8(&SourceStart, SourceEnd, 69249259Sdim &TargetStart, TargetEnd, 70249259Sdim strictConversion); 71249259Sdim if (CR != conversionOK) 72249259Sdim return false; 73249259Sdim 74249259Sdim ResultPtr = reinterpret_cast<char*>(TargetStart); 75249259Sdim return true; 76249259Sdim} 77249259Sdim 78263509Sdimbool hasUTF16ByteOrderMark(ArrayRef<char> S) { 79263509Sdim return (S.size() >= 2 && 80263509Sdim ((S[0] == '\xff' && S[1] == '\xfe') || 81263509Sdim (S[0] == '\xfe' && S[1] == '\xff'))); 82263509Sdim} 83263509Sdim 84263509Sdimbool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) { 85263509Sdim assert(Out.empty()); 86263509Sdim 87263509Sdim // Error out on an uneven byte count. 88263509Sdim if (SrcBytes.size() % 2) 89263509Sdim return false; 90263509Sdim 91263509Sdim // Avoid OOB by returning early on empty input. 92263509Sdim if (SrcBytes.empty()) 93263509Sdim return true; 94263509Sdim 95263509Sdim const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin()); 96263509Sdim const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end()); 97263509Sdim 98263509Sdim // Byteswap if necessary. 99263509Sdim std::vector<UTF16> ByteSwapped; 100263509Sdim if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) { 101263509Sdim ByteSwapped.insert(ByteSwapped.end(), Src, SrcEnd); 102263509Sdim for (unsigned I = 0, E = ByteSwapped.size(); I != E; ++I) 103263509Sdim ByteSwapped[I] = llvm::sys::SwapByteOrder_16(ByteSwapped[I]); 104263509Sdim Src = &ByteSwapped[0]; 105263509Sdim SrcEnd = &ByteSwapped[ByteSwapped.size() - 1] + 1; 106263509Sdim } 107263509Sdim 108263509Sdim // Skip the BOM for conversion. 109263509Sdim if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_NATIVE) 110263509Sdim Src++; 111263509Sdim 112263509Sdim // Just allocate enough space up front. We'll shrink it later. 113263509Sdim Out.resize(SrcBytes.size() * UNI_MAX_UTF8_BYTES_PER_CODE_POINT); 114263509Sdim UTF8 *Dst = reinterpret_cast<UTF8 *>(&Out[0]); 115263509Sdim UTF8 *DstEnd = Dst + Out.size(); 116263509Sdim 117263509Sdim ConversionResult CR = 118263509Sdim ConvertUTF16toUTF8(&Src, SrcEnd, &Dst, DstEnd, strictConversion); 119263509Sdim assert(CR != targetExhausted); 120263509Sdim 121263509Sdim if (CR != conversionOK) { 122263509Sdim Out.clear(); 123263509Sdim return false; 124263509Sdim } 125263509Sdim 126263509Sdim Out.resize(reinterpret_cast<char *>(Dst) - &Out[0]); 127263509Sdim return true; 128263509Sdim} 129263509Sdim 130249259Sdim} // end namespace llvm 131249259Sdim 132