1 files changed, 156 insertions, 0 deletions
diff --git a/dom/canvas/WebGLValidateStrings.h b/dom/canvas/WebGLValidateStrings.h
new file mode 100644
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+++ b/dom/canvas/WebGLValidateStrings.h
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+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2011 Mozilla Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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.
+ */
+
+#ifndef WEBGL_VALIDATE_STRINGS_H_
+#define WEBGL_VALIDATE_STRINGS_H_
+
+#include "nsString.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+class WebGLContext;
+
+// The following code was taken from the WebKit WebGL implementation,
+// which can be found here:
+// http://trac.webkit.org/browser/trunk/Source/WebCore/html/canvas/WebGLRenderingContext.cpp?rev=93625#L121
+// Note that some modifications were done to adapt it to Mozilla.
+/****** BEGIN CODE TAKEN FROM WEBKIT ******/
+// Strips comments from shader text. This allows non-ASCII characters
+// to be used in comments without potentially breaking OpenGL
+// implementations not expecting characters outside the GLSL ES set.
+class StripComments {
+public:
+    explicit StripComments(const nsAString& str)
+        : m_parseState(BeginningOfLine)
+        , m_end(str.EndReading())
+        , m_current(str.BeginReading())
+        , m_position(0)
+    {
+        m_result.SetLength(str.Length());
+        parse();
+    }
+
+    const nsTArray<char16_t>& result()
+    {
+        return m_result;
+    }
+
+    size_t length()
+    {
+        return m_position;
+    }
+
+private:
+    bool hasMoreCharacters()
+    {
+        return (m_current < m_end);
+    }
+
+    void parse()
+    {
+        while (hasMoreCharacters()) {
+            process(current());
+            // process() might advance the position.
+            if (hasMoreCharacters())
+                advance();
+        }
+    }
+
+    void process(char16_t);
+
+    bool peek(char16_t& character)
+    {
+        if (m_current + 1 >= m_end)
+            return false;
+        character = *(m_current + 1);
+        return true;
+    }
+
+    char16_t current()
+    {
+        //ASSERT(m_position < m_length);
+        return *m_current;
+    }
+
+    void advance()
+    {
+        ++m_current;
+    }
+
+    bool isNewline(char16_t character)
+    {
+        // Don't attempt to canonicalize newline related characters.
+        return (character == '\n' || character == '\r');
+    }
+
+    void emit(char16_t character)
+    {
+        m_result[m_position++] = character;
+    }
+
+    enum ParseState {
+        // Have not seen an ASCII non-whitespace character yet on
+        // this line. Possible that we might see a preprocessor
+        // directive.
+        BeginningOfLine,
+
+        // Have seen at least one ASCII non-whitespace character
+        // on this line.
+        MiddleOfLine,
+
+        // Handling a preprocessor directive. Passes through all
+        // characters up to the end of the line. Disables comment
+        // processing.
+        InPreprocessorDirective,
+
+        // Handling a single-line comment. The comment text is
+        // replaced with a single space.
+        InSingleLineComment,
+
+        // Handling a multi-line comment. Newlines are passed
+        // through to preserve line numbers.
+        InMultiLineComment
+    };
+
+    ParseState m_parseState;
+    const char16_t* m_end;
+    const char16_t* m_current;
+    size_t m_position;
+    nsTArray<char16_t> m_result;
+};
+
+/****** END CODE TAKEN FROM WEBKIT ******/
+
+bool ValidateGLSLString(const nsAString& string, WebGLContext* webgl,
+                        const char* funcName);
+
+bool ValidateGLSLVariableName(const nsAString& name, WebGLContext* webgl,
+                              const char* funcName);
+
+} // namespace mozilla
+
+#endif // WEBGL_VALIDATE_STRINGS_H_