vfs: check userland buffers before reading them.
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7 * Copyright 2008-2013, Haiku. All rights reserved.
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11 * Humdinger <humdingerb@gmail.com>
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13 * Pengphei Han
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26 <div><span>用户指南</span></div>
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31 <ul class="lang-menu">
32 <li class="now"><img src="../../images/flags/zh_CN.png" alt="" />  中文 [中文]</li>
33 <li><a href="../../ca/preferences/datatranslations.html"><img src="../../images/flags/ca.png" alt="" />Català</a></li>
34 <li><a href="../../de/preferences/datatranslations.html"><img src="../../images/flags/de.png" alt="" />Deutsch</a></li>
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59 <div>
61 <h2><img src="../../images/prefs-images/datatranslations-icon_64.png" alt="datatranslations-icon_64.png" width="64" height="64" />数据转换</h2>
62 <table summary="quickinfo" border="0" cellspacing="0" cellpadding="2">
63 <tr><td>桌面栏:</td><td style="width:15px;"></td><td><span class="menu">首选项</span></td></tr>
64 <tr><td>位置:</td><td></td><td><span class="path">/boot/system/preferences/DataTranslations</span></td></tr>
65 <tr><td>设置:</td><td></td><td><span class="path">~/config/settings/*</span> - 在改变默认设置之后,每个解析器都将创建它自己的设置文件。<br />
66 <span class="path">~/config/settings/system/DataTranslations settings</span> - 保存了面板的窗口位置。</td></tr>
67 </table>
68 <p>每个程序都可以打开和保存任何安装了转换器的文件格式。而有关这些转换器的设置可以在数据转换首选项中进行配置。</p>
69 <p><br /></p>
70 <img src="../images/prefs-images/datatranslations.png" alt="datatranslations.png" />
71 <p>根据各自功能的不同,每个转换器具有不同的设置。 但是至少您可以使用 <span class="button">Info...</span> 按钮打开一个显示致谢名单和安装路径的窗口。<br />
72 下面的表格给出了默认转换器的概况和他们最常用的选项。</p>
73 <table summary="translators" border="0" cellpadding="2" cellspacing="0">
74 <tr><td><span class="menu">Apple icons</span></td><td>有效图像大小为 16, 32, 48, 128, 256, 512, 1024 (RGB32 和 RGBA32)</td></tr>
75 <tr><td><span class="menu">BMP Images</span></td><td>24位,未压缩格式,无透明效果</td></tr>
76 <tr><td><span class="menu">EXR Images</span></td><td><acronym title="Industrial Light &amp; Magic">ILM</acronym> 的高动态范围图像格式(HDR)</td></tr>
77 <tr><td><span class="menu">GIF Images</span></td><td>8位,无损压缩,透明效果
78 <br />
79 您可以通过限制使用颜色和调色板的数量来减小文件大小。
80 <br />
81 通过使用自动的透明通道,或者设置三原色的值,您可以使用透明效果来处理图片。</td></tr>
82 <tr><td><span class="menu">HVIF icons</span></td><td>Haiku 矢量图标格式转换器</td></tr>
83 <tr><td><span class="menu">JPEG2000 Images</span></td><td>24位,压缩格式,无透明效果
84 <br />
85 在这里,通常您只关心图像的输出效果。</td></tr>
86 <tr><td><span class="menu">JPEG Images</span></td><td>24位,压缩格式,无透明效果
87 <br />
88 除了输出质量,您也可以设置平滑处理,从而减轻压缩伪像,但是这将会是图像变得模糊。</td></tr>
89 <tr><td><span class="menu">PCX Images</span></td><td>24位,未压缩格式,无透明效果,PC画笔交换格式</td></tr>
90 <tr><td><span class="menu">Photoshop images</span></td><td>32位,无损压缩,透明支持<br />
91 该转换器缩减所有图层为单个位图图层。</td></tr>
92 <tr><td><span class="menu">PNG Images</span></td><td>32位,无损压缩,透明效果</td></tr>
93 <tr><td><span class="menu">PPM Images</span></td><td>24位,未压缩,无透明效果,便携式位图格式</td></tr>
94 <tr><td><span class="menu">RAW Images</span></td><td>48位,未压缩格式,无透明效果</td></tr>
95 <tr><td><span class="menu">RTF Text Files</span></td><td>格式化文本</td></tr>
96 <tr><td><span class="menu">SGI Images</span></td><td>24位,可选无损压缩,透明效果</td></tr>
97 <tr><td><span class="menu">StyledEdit Files</span></td><td>普通文本,格式数据保存在属性中。</td></tr>
98 <tr><td><span class="menu">TGA Images</span></td><td>32位,可选无损压缩,透明效果</td></tr>
99 <tr><td><span class="menu">TIFF Images</span></td><td>24位,可选无损压缩,具有图层,透明效果</td></tr>
100 <tr><td><span class="menu">WebP images</span></td><td>8-bit YUV 4:2:0 图像格式,压缩,无透明度。</td></tr>
101 <tr><td><span class="menu">Windows icons</span></td><td>有效图像大小为 163248</td></tr>
102 <tr><td class="onelinetop"><span class="menu">WonderBrush Images</span></td><td>32位,具有图层,透明效果,位图/矢量数据</td></tr>
103 </table>
104 <p><br /></p>
105 <div class="box-info">屏幕截图,图表,黑白图纸,以及其他使用颜色很少图像,包括小图片,最好将它们保存为GIF(256色)或者PNG(上万种颜色)格式。例如,JPEG格式,引入了压缩伪像,但是没有增加文件大小。</div>
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