Mercurial > cgi-bin > hgweb.cgi > ClipMan
annotate src/name/blackcap/clipman/RtfToHtml.kt @ 0:be282c48010a
Incomplete; checking it in as a backup.
author | David Barts <n5jrn@me.com> |
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date | Tue, 14 Jan 2020 14:07:19 -0800 |
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children | 8aa2dfac27eb |
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1 /* |
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2 * Because Java (and by implication Kotlin) sucks at processing RTF data, |
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3 * we deal with such data by invoking an external program to convert it |
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4 * to HTML. |
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5 */ |
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6 package name.blackcap.clipman |
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7 |
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8 import java.io.BufferedInputStream |
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9 import java.io.BufferedOutputStream |
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10 import java.io.ByteArrayOutputStream |
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11 import java.io.IOException |
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12 import java.io.InputStream |
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13 import java.io.OutputStream |
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14 import java.io.UnsupportedEncodingException |
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15 |
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16 private val RTF_CHARSET_NAME = "UTF-8" |
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17 private val LANG = "en_US." + RTF_CHARSET_NAME |
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18 private val UNRTF = System.getenv("UNRTF") |
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19 |
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20 private class Consumer(val source: InputStream): Thread() { |
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21 val target = ByteArrayOutputStream() |
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22 |
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23 override fun run() { |
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24 source.use { it.copyTo(target) } |
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25 } |
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26 |
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27 val output: String |
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28 @Synchronized get() { |
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29 if (isAlive()) { |
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30 throw IllegalThreadStateException("consumer not finished!") |
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31 } else { |
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32 return target.toString(RTF_CHARSET_NAME) |
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33 } |
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34 } |
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35 } |
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36 |
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37 /** |
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38 * Convert an InputStream of RTF bytes to a String containing an HTML |
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39 * document. |
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40 * @param rtfStream stream containing the RTF document |
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41 * @return a Pair. On success, the first element contains the HTML and |
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42 * the second is null. On failure, the first is null and the |
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43 * second contains an error message. |
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44 */ |
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45 public fun rtfToHtml(rtfStream: InputStream): Pair<String?, String?> { |
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46 if (OS.type == OS.MAC && UNRTF == null) { |
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47 return _rtfToHtml(rtfStream, ProcessBuilder("textutil", "-format", |
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48 "rtf", "-convert", "html", "-stdin", "-stdout")) |
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49 } else { |
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50 return _rtfToHtml(rtfStream, ProcessBuilder( |
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51 if (UNRTF == null) { "unrtf" } else { UNRTF }, |
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52 "--html", "--nopict")) |
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53 } |
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54 } |
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55 |
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56 private fun _rtfToHtml(rtfStream: InputStream, pb: ProcessBuilder): Pair<String?, String?> { |
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57 var job: Process? = null |
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58 try { |
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59 /* set the Posix locale to force UTF-8 I/O */ |
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60 pb.environment().run { |
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61 put("LANG", LANG) |
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62 put("LC_ALL", LANG) |
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63 } |
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64 |
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65 /* start the process */ |
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66 job = pb.start() |
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67 |
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68 /* start consuming its output and error streams */ |
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69 val outputConsumer = Consumer(job.inputStream).apply { start() } |
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70 val errorConsumer = Consumer(job.errorStream).apply { start() } |
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71 |
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72 /* feed it input */ |
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73 job.outputStream.use { rtfStream.copyTo(it) } |
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74 |
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75 /* wait for it to exit */ |
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76 val exitStatus = job.waitFor() |
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77 |
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78 /* after it exits, wait for our data consumers to exit */ |
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79 outputConsumer.join(); |
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80 errorConsumer.join(); |
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81 |
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82 /* if it barfed, return an error, else return the HTML */ |
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83 if (exitStatus != 0) { |
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84 val errors = errorConsumer.output |
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85 if (errors.isEmpty()) { |
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86 return Pair(null, "converter exited with status " + exitStatus) |
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87 } else { |
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88 return Pair(null, errors) |
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89 } |
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90 } |
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91 return Pair(outputConsumer.output, null) |
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92 } catch (e: IOException) { |
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93 return barfed(e) |
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94 } catch (e: InterruptedException) { |
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95 if (job != null && job.isAlive()) { |
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96 job.destroy() |
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97 job.waitFor() |
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98 } |
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99 return barfed(e) |
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100 } |
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101 } |
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102 |
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103 private fun barfed(e: Exception): Pair<String?, String?> { |
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104 val sb = StringBuilder(e::class.simpleName) |
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105 val message = e.message ?: "" |
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106 if (!message.isEmpty()) { |
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107 sb.append(": ") |
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108 sb.append(e.message) |
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109 } |
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110 return Pair(null, sb.toString()) |
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111 } |