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 "OpenTypeUtilities.h"
28#include "SharedBuffer.h"
29#include <wtf/RandomNumber.h>
30#include <wtf/text/Base64.h>
31
32namespace WebCore {
33
34static CustomFontCache* g_customFontCache = 0;
35
36void setCustomFontCache(CustomFontCache* cache)
37{
38    g_customFontCache = cache;
39}
40
41FontCustomPlatformData::~FontCustomPlatformData()
42{
43    if (g_customFontCache && !m_name.isEmpty())
44        g_customFontCache->unregisterFont(m_name);
45}
46
47FontPlatformData FontCustomPlatformData::fontPlatformData(int size, bool bold, bool italic, FontOrientation, FontWidthVariant, FontRenderingMode renderingMode)
48{
49    FontDescription fontDesc;
50    fontDesc.setComputedSize(size);
51    fontDesc.setSpecifiedSize(size);
52    fontDesc.setItalic(italic);
53    fontDesc.setWeight(bold ? FontWeightBold : FontWeightNormal);
54    return FontPlatformData(fontDesc, m_name, false);
55}
56
57// Creates a unique and unpredictable font name, in order to avoid collisions and to
58// not allow access from CSS.
59static String createUniqueFontName()
60{
61    GUID fontUuid;
62
63    unsigned int* ptr = reinterpret_cast<unsigned int*>(&fontUuid);
64    for (int i = 0; i < sizeof(GUID) / sizeof(int) ; ++i)
65        *(ptr + i) = static_cast<unsigned int>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
66
67    String fontName = base64Encode(reinterpret_cast<char*>(&fontUuid), sizeof(fontUuid));
68    ASSERT(fontName.length() < LF_FACESIZE);
69    return fontName.replace('/', '_');
70}
71
72std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer)
73{
74    String fontName = createUniqueFontName();
75
76    Vector<char> rewrittenFontData;
77    if (!renameFont(buffer, fontName, rewrittenFontData))
78        return nullptr;
79
80    RefPtr<SharedBuffer> localBuffer = SharedBuffer::adoptVector(rewrittenFontData);
81    if (!g_customFontCache || !g_customFontCache->registerFont(fontName, localBuffer.get()))
82        return nullptr;
83
84    return std::make_unique<FontCustomPlatformData>(fontName);
85}
86
87bool FontCustomPlatformData::supportsFormat(const String& format)
88{
89    return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype");
90}
91
92}
93