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/*
* Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "LineEnding.h"
#include "PlatformString.h"
#include <wtf/text/CString.h>
namespace {
class OutputBuffer {
public:
virtual char* allocate(size_t size) = 0;
virtual void copy(const CString&) = 0;
virtual ~OutputBuffer() { }
};
class CStringBuffer : public OutputBuffer {
public:
CStringBuffer(CString& buffer)
: m_buffer(buffer)
{
}
virtual ~CStringBuffer() { }
virtual char* allocate(size_t size)
{
char* ptr;
m_buffer = CString::newUninitialized(size, ptr);
return ptr;
}
virtual void copy(const CString& source)
{
m_buffer = source;
}
const CString& buffer() const { return m_buffer; }
private:
CString m_buffer;
};
class VectorCharAppendBuffer : public OutputBuffer {
public:
VectorCharAppendBuffer(Vector<char>& buffer)
: m_buffer(buffer)
{
}
virtual ~VectorCharAppendBuffer() { }
virtual char* allocate(size_t size)
{
size_t oldSize = m_buffer.size();
m_buffer.grow(oldSize + size);
return m_buffer.data() + oldSize;
}
virtual void copy(const CString& source)
{
m_buffer.append(source.data(), source.length());
}
private:
Vector<char>& m_buffer;
};
void internalNormalizeLineEndingsToCRLF(const CString& from, OutputBuffer& buffer)
{
// Compute the new length.
size_t newLen = 0;
const char* p = from.data();
while (char c = *p++) {
if (c == '\r') {
// Safe to look ahead because of trailing '\0'.
if (*p != '\n') {
// Turn CR into CRLF.
newLen += 2;
}
} else if (c == '\n') {
// Turn LF into CRLF.
newLen += 2;
} else {
// Leave other characters alone.
newLen += 1;
}
}
if (newLen < from.length())
return;
if (newLen == from.length()) {
buffer.copy(from);
return;
}
p = from.data();
char* q = buffer.allocate(newLen);
// Make a copy of the string.
while (char c = *p++) {
if (c == '\r') {
// Safe to look ahead because of trailing '\0'.
if (*p != '\n') {
// Turn CR into CRLF.
*q++ = '\r';
*q++ = '\n';
}
} else if (c == '\n') {
// Turn LF into CRLF.
*q++ = '\r';
*q++ = '\n';
} else {
// Leave other characters alone.
*q++ = c;
}
}
}
};
namespace WebCore {
void normalizeToCROrLF(const CString& from, Vector<char>& result, bool toCR);
// Normalize all line-endings to CR or LF.
void normalizeToCROrLF(const CString& from, Vector<char>& result, bool toCR)
{
// Compute the new length.
size_t newLen = 0;
bool needFix = false;
const char* p = from.data();
char fromEndingChar = toCR ? '\n' : '\r';
char toEndingChar = toCR ? '\r' : '\n';
while (char c = *p++) {
if (c == '\r' && *p == '\n') {
// Turn CRLF into CR or LF.
p++;
needFix = true;
} else if (c == fromEndingChar) {
// Turn CR/LF into LF/CR.
needFix = true;
}
newLen += 1;
}
// Grow the result buffer.
p = from.data();
size_t oldResultSize = result.size();
result.grow(oldResultSize + newLen);
char* q = result.data() + oldResultSize;
// If no need to fix the string, just copy the string over.
if (!needFix) {
memcpy(q, p, from.length());
return;
}
// Make a copy of the string.
while (char c = *p++) {
if (c == '\r' && *p == '\n') {
// Turn CRLF or CR into CR or LF.
p++;
*q++ = toEndingChar;
} else if (c == fromEndingChar) {
// Turn CR/LF into LF/CR.
*q++ = toEndingChar;
} else {
// Leave other characters alone.
*q++ = c;
}
}
}
CString normalizeLineEndingsToCRLF(const CString& from)
{
CString result;
CStringBuffer buffer(result);
internalNormalizeLineEndingsToCRLF(from, buffer);
return buffer.buffer();
}
void normalizeLineEndingsToCR(const CString& from, Vector<char>& result)
{
normalizeToCROrLF(from, result, true);
}
void normalizeLineEndingsToLF(const CString& from, Vector<char>& result)
{
normalizeToCROrLF(from, result, false);
}
void normalizeLineEndingsToNative(const CString& from, Vector<char>& result)
{
#if OS(WINDOWS)
VectorCharAppendBuffer buffer(result);
internalNormalizeLineEndingsToCRLF(from, buffer);
#else
normalizeLineEndingsToLF(from, result);
#endif
}
} // namespace WebCore
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