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golang-tar-gzip-压缩和解压.html
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golang-tar-gzip-压缩和解压.html
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golang tar gzip压缩，解压（含目录文件） tar是用于文件归档，gzip用于压缩。仅仅用tar的话，达不到压缩的目的。我们常见的tar.gz就是用gzip压缩生成的tar归档文件。
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<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> (</span><br><span class="line"> <span class="string">"archive/tar"</span></span><br><span class="line"> <span class="string">"compress/gzip"</span></span><br><span class="line"> <span class="string">"io"</span></span><br><span class="line"> <span class="string">"os"</span></span><br><span class="line"> <span class="string">"strings"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">//压缩 使用gzip压缩成tar.gz</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">Compress</span><span class="params">(files []*os.File, dest <span class="keyword">string</span>)</span> <span class="title">error</span></span> {</span><br><span class="line"> d, _ := os.Create(dest)</span><br><span class="line"> <span class="keyword">defer</span> d.Close()</span><br><span class="line"> gw := gzip.NewWriter(d)</span><br><span class="line"> <span class="keyword">defer</span> gw.Close()</span><br><span class="line"> tw := tar.NewWriter(gw)</span><br><span class="line"> <span class="keyword">defer</span> tw.Close()</span><br><span class="line"> <span class="keyword">for</span> _, file := <span class="keyword">range</span> files {</span><br><span class="line"> err := compress(file, <span class="string">""</span>, tw)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">compress</span><span class="params">(file *os.File, prefix <span class="keyword">string</span>, tw *tar.Writer)</span> <span class="title">error</span></span> {</span><br><span class="line"> info, err := file.Stat()</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> info.IsDir() {</span><br><span class="line"> prefix = prefix + <span class="string">"/"</span> + info.Name()</span><br><span class="line"> fileInfos, err := file.Readdir(<span class="number">-1</span>)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> _, fi := <span class="keyword">range</span> fileInfos {</span><br><span class="line"> f, err := os.Open(file.Name() + <span class="string">"/"</span> + fi.Name())</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> err = compress(f, prefix, tw)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> header, err := tar.FileInfoHeader(info, <span class="string">""</span>)</span><br><span class="line"> header.Name = prefix + <span class="string">"/"</span> + header.Name</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> err = tw.WriteHeader(header)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> _, err = io.Copy(tw, file)</span><br><span class="line"> file.Close()</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//解压 tar.gz</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">DeCompress</span><span class="params">(tarFile, dest <span class="keyword">string</span>)</span> <span class="title">error</span></span> {</span><br><span class="line"> srcFile, err := os.Open(tarFile)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">defer</span> srcFile.Close()</span><br><span class="line"> gr, err := gzip.NewReader(srcFile)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">defer</span> gr.Close()</span><br><span class="line"> tr := tar.NewReader(gr)</span><br><span class="line"> <span class="keyword">for</span> {</span><br><span class="line"> hdr, err := tr.Next()</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">if</span> err == io.EOF {</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> filename := dest + hdr.Name</span><br><span class="line"> file, err := createFile(filename)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> err</span><br><span class="line"> }</span><br><span class="line"> io.Copy(file, tr)</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">createFile</span><span class="params">(name <span class="keyword">string</span>)</span> <span class="params">(*os.File, error)</span></span> {</span><br><span class="line"> err := os.MkdirAll(<span class="keyword">string</span>([]<span class="keyword">rune</span>(name)[<span class="number">0</span>:strings.LastIndex(name, <span class="string">"/"</span>)]), <span class="number">0755</span>)</span><br><span class="line"> <span class="keyword">if</span> err != <span class="literal">nil</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">nil</span>, err</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> os.Create(name)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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