1 files changed, 231 insertions, 0 deletions
diff --git a/Source/WebCore/platform/text/LineEnding.cpp b/Source/WebCore/platform/text/LineEnding.cpp
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+++ b/Source/WebCore/platform/text/LineEnding.cpp
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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