1/*
2 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#include "config.h"
23#include "FontCustomPlatformData.h"
24
25#include "CachedFont.h"
26#include "FontPlatformData.h"
27#include "SharedBuffer.h"
28#include <wtf/RandomNumber.h>
29#include <wtf/text/Base64.h>
30
31namespace WebCore {
32
33static CustomFontCache* g_customFontCache = 0;
34
35bool renameFont(SharedBuffer* fontData, const String& fontName);
36
37void setCustomFontCache(CustomFontCache* cache)
38{
39    g_customFontCache = cache;
40}
41
42FontCustomPlatformData::~FontCustomPlatformData()
43{
44    if (g_customFontCache && !m_name.isEmpty())
45        g_customFontCache->unregisterFont(m_name);
46}
47
48FontPlatformData FontCustomPlatformData::fontPlatformData(int size, bool bold, bool italic, FontOrientation, FontWidthVariant, FontRenderingMode renderingMode)
49{
50    FontDescription fontDesc;
51    fontDesc.setComputedSize(size);
52    fontDesc.setSpecifiedSize(size);
53    fontDesc.setItalic(italic);
54    fontDesc.setWeight(bold ? FontWeightBold : FontWeightNormal);
55    return FontPlatformData(fontDesc, m_name, false);
56}
57
58// Creates a unique and unpredictable font name, in order to avoid collisions and to
59// not allow access from CSS.
60static String createUniqueFontName()
61{
62    GUID fontUuid;
63
64    unsigned int* ptr = reinterpret_cast<unsigned int*>(&fontUuid);
65    for (int i = 0; i < sizeof(GUID) / sizeof(int) ; ++i)
66        *(ptr + i) = static_cast<unsigned int>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
67
68    String fontName = base64Encode(reinterpret_cast<char*>(&fontUuid), sizeof(fontUuid));
69    ASSERT(fontName.length() < LF_FACESIZE);
70    return fontName.replace('/', '_');
71}
72
73FontCustomPlatformData* createFontCustomPlatformData(const SharedBuffer* buffer)
74{
75    if (g_customFontCache) {
76        String fontName = createUniqueFontName();
77        RefPtr<SharedBuffer> localBuffer = SharedBuffer::create(buffer->data(), buffer->size());
78        if (renameFont(localBuffer.get(), fontName) && g_customFontCache->registerFont(fontName, localBuffer.get()))
79            return new FontCustomPlatformData(fontName);
80    }
81    return 0;
82}
83
84bool FontCustomPlatformData::supportsFormat(const String& format)
85{
86    return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype");
87}
88
89}
90