forked from OSchip/llvm-project
132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
//===-- ConvertUTFWrapper.cpp - Wrap ConvertUTF.h with clang data types -----===
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ConvertUTF.h"
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#include "llvm/Support/SwapByteOrder.h"
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#include <string>
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#include <vector>
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namespace llvm {
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bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
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char *&ResultPtr, const UTF8 *&ErrorPtr) {
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assert(WideCharWidth == 1 || WideCharWidth == 2 || WideCharWidth == 4);
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ConversionResult result = conversionOK;
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// Copy the character span over.
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if (WideCharWidth == 1) {
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const UTF8 *Pos = reinterpret_cast<const UTF8*>(Source.begin());
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if (!isLegalUTF8String(&Pos, reinterpret_cast<const UTF8*>(Source.end()))) {
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result = sourceIllegal;
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ErrorPtr = Pos;
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} else {
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memcpy(ResultPtr, Source.data(), Source.size());
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ResultPtr += Source.size();
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}
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} else if (WideCharWidth == 2) {
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const UTF8 *sourceStart = (const UTF8*)Source.data();
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// FIXME: Make the type of the result buffer correct instead of
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// using reinterpret_cast.
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UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr);
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ConversionFlags flags = strictConversion;
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result = ConvertUTF8toUTF16(
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&sourceStart, sourceStart + Source.size(),
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&targetStart, targetStart + 2*Source.size(), flags);
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if (result == conversionOK)
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ResultPtr = reinterpret_cast<char*>(targetStart);
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else
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ErrorPtr = sourceStart;
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} else if (WideCharWidth == 4) {
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const UTF8 *sourceStart = (const UTF8*)Source.data();
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// FIXME: Make the type of the result buffer correct instead of
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// using reinterpret_cast.
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UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr);
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ConversionFlags flags = strictConversion;
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result = ConvertUTF8toUTF32(
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&sourceStart, sourceStart + Source.size(),
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&targetStart, targetStart + 4*Source.size(), flags);
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if (result == conversionOK)
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ResultPtr = reinterpret_cast<char*>(targetStart);
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else
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ErrorPtr = sourceStart;
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}
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assert((result != targetExhausted)
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&& "ConvertUTF8toUTFXX exhausted target buffer");
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return result == conversionOK;
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}
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bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr) {
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const UTF32 *SourceStart = &Source;
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const UTF32 *SourceEnd = SourceStart + 1;
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UTF8 *TargetStart = reinterpret_cast<UTF8 *>(ResultPtr);
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UTF8 *TargetEnd = TargetStart + 4;
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ConversionResult CR = ConvertUTF32toUTF8(&SourceStart, SourceEnd,
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&TargetStart, TargetEnd,
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strictConversion);
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if (CR != conversionOK)
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return false;
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ResultPtr = reinterpret_cast<char*>(TargetStart);
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return true;
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}
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bool hasUTF16ByteOrderMark(ArrayRef<char> S) {
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return (S.size() >= 2 &&
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((S[0] == '\xff' && S[1] == '\xfe') ||
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(S[0] == '\xfe' && S[1] == '\xff')));
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}
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bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) {
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assert(Out.empty());
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// Error out on an uneven byte count.
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if (SrcBytes.size() % 2)
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return false;
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// Avoid OOB by returning early on empty input.
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if (SrcBytes.empty())
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return true;
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const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin());
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const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end());
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// Byteswap if necessary.
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std::vector<UTF16> ByteSwapped;
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if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) {
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ByteSwapped.insert(ByteSwapped.end(), Src, SrcEnd);
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for (unsigned I = 0, E = ByteSwapped.size(); I != E; ++I)
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ByteSwapped[I] = llvm::sys::SwapByteOrder_16(ByteSwapped[I]);
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Src = &ByteSwapped[0];
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SrcEnd = &ByteSwapped[ByteSwapped.size() - 1] + 1;
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}
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// Skip the BOM for conversion.
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if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_NATIVE)
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Src++;
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// Just allocate enough space up front. We'll shrink it later.
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Out.resize(SrcBytes.size() * UNI_MAX_UTF8_BYTES_PER_CODE_POINT);
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UTF8 *Dst = reinterpret_cast<UTF8 *>(&Out[0]);
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UTF8 *DstEnd = Dst + Out.size();
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ConversionResult CR =
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ConvertUTF16toUTF8(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
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assert(CR != targetExhausted);
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if (CR != conversionOK) {
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Out.clear();
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return false;
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}
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Out.resize(reinterpret_cast<char *>(Dst) - &Out[0]);
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return true;
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}
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} // end namespace llvm
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