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annotate src/name/blackcap/exifwasher/exiv2/Initialize.kt @ 0:db63d01a23c6

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JNI calls and test case (finally!) seem to work.
author David Barts <n5jrn@me.com>
date Tue, 31 Mar 2020 13:24:48 -0700
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children 42277ce58ace
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db63d01a23c6 JNI calls and test case (finally!) seem to work.
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1 /*
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2 * Logic common to initializing all external (JNI) classes goes here.
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3 */
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4 package name.blackcap.exifwasher.exiv2
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5
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6 import java.io.File
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7 import java.io.FileOutputStream
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8 import java.io.IOException
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9 import java.util.jar.JarEntry
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10 import java.util.jar.JarFile
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11 import name.blackcap.exifwasher.LF_DIR
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12 import name.blackcap.exifwasher.OS
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13
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14 object Initialize {
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15 private var initialized = false
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16
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17 public fun libraries() {
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18 /* no-op if already initialized */
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19 if (initialized) {
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20 return
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21 }
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22
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23 /* use the appropriate binary for the system we're on */
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24 val subdir = when(OS.type) {
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25 OS.UNIX -> "linux"
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26 OS.MAC -> "mac"
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27 OS.WINDOWS -> "windows"
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28 OS.OTHER -> throw RuntimeException("unsupported OS!")
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29 }
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30 val ext = when(OS.type) {
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31 OS.UNIX -> "so"
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32 OS.MAC -> "dylib"
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33 OS.WINDOWS -> "dll"
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34 OS.OTHER -> throw RuntimeException("unsupported OS!")
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35 }
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36
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37 /* extract to scratch files, if needed, then load */
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38 val klass = Initialize::class.java
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39 var myJar = JarFile(File(klass.getProtectionDomain().getCodeSource().getLocation().toURI()))
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40 for (base in arrayOf("libexiv2", "libjni")) {
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41 val eBase = "${base}.${ext}"
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42 val sPath = "name/blackcap/exifwasher/binaries/${subdir}/${eBase}"
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43 val source = myJar.getJarEntry(sPath)
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44 if (source == null) {
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45 die("${sPath} not found in jar")
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46 }
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47 val target = File(LF_DIR, eBase)
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48 val tPath = target.toString()
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49 try {
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50 if (!target.exists() || target.lastModified() < source.getTime()) {
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51 myJar.getInputStream(source).use { sfp ->
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52 FileOutputStream(target).use { tfp ->
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53 sfp.copyTo(tfp)
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54 }
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55 }
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56 target.setExecutable(true)
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57 target.setLastModified(source.getTime())
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58 }
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59 } catch (e: IOException) {
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60 val message = e.message ?: "I/O error"
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61 die("unable to create ${tPath}: ${message}")
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62 }
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63 try {
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64 println("loading: ${tPath}") /* debug */
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65 System.load(tPath)
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66 } catch (e: UnsatisfiedLinkError) {
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67 val message = e.message ?: "unsatisfied link"
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68 die("unable to link ${tPath}: ${message}")
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69 }
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70 }
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71
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72 initialized = true
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73 System.err.println("libraries loaded") /* debug */
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74 }
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75
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76 private fun die(message: String) {
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77 /* should open a dialog */
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78 System.err.println(message)
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79 System.exit(1)
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80 }
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81 }