Ghostscript 10 based on https://github.com/jkrimmer/ghostpdl-wasm

src/lib/background-worker.js

@@ -1,70 +1,98 @@
-function loadScript() {
-  import("./gs-worker.js");
-}
+import gs from "./gs.js";
 
-var Module;
+let Module;
 
 function _GSPS2PDF(
   dataStruct,
   responseCallback,
+  progressCallback,
+  statusUpdateCallback,
 ) {
   // first download the ps data
   var xhr = new XMLHttpRequest();
   xhr.open("GET", dataStruct.psDataURL);
   xhr.responseType = "arraybuffer";
-  xhr.onload = function () {
-    console.log('onload')
+  xhr.onload = async function () {
     // release the URL
     self.URL.revokeObjectURL(dataStruct.psDataURL);
-    //set up EMScripten environment
+    // load module
     Module = {
-      preRun: [
-        function () {
-          self.Module.FS.writeFile("input.pdf", new Uint8Array(xhr.response));
-        },
-      ],
-      postRun: [
-        function () {
-          var uarray = self.Module.FS.readFile("output.pdf", { encoding: "binary" });
-          var blob = new Blob([uarray], { type: "application/octet-stream" });
-          var pdfDataURL = self.URL.createObjectURL(blob);
-          responseCallback({ pdfDataURL: pdfDataURL, url: dataStruct.url });
-        },
-      ],
-      arguments: [
-        "-sDEVICE=pdfwrite",
-        "-dCompatibilityLevel=1.4",
-        "-dPDFSETTINGS=/ebook",
-        "-DNOPAUSE",
-        "-dQUIET",
-        "-dBATCH",
-        "-sOutputFile=output.pdf",
-        "input.pdf",
-      ],
-      print: function (text) {},
-      printErr: function (text) {},
+      print: function (text) {
+        statusUpdateCallback(text);
+      },
+      printErr: function (text) {
+        statusUpdateCallback("Error: " + text);
+        console.error(text);
+      },
+      setStatus: function (text) {
+        if (!Module.setStatus.last)
+          Module.setStatus.last = {time: Date.now(), text: ""};
+        if (text === Module.setStatus.last.text) return;
+        var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
+        var now = Date.now();
+        if (m && now - Module.setStatus.last.time < 30)
+          // if this is a progress update, skip it if too soon
+          return;
+        Module.setStatus.last.time = now;
+        Module.setStatus.last.text = text;
+        if (m) {
+          text = m[1];
+          if (progressCallback)
+            progressCallback(false, parseInt(m[2]) * 100, parseInt(m[4]) * 100);
+        } else {
+          if (progressCallback)
+            progressCallback(true, 0, 0);
+        }
+        if (statusUpdateCallback)
+          statusUpdateCallback(text);
+      },
       totalDependencies: 0,
-      noExitRuntime: 1
     };
-    // Module.setStatus("Loading Ghostscript...");
-    if (!self.Module) {
-      self.Module = Module;
-      loadScript();
-    } else {
-      self.Module["calledRun"] = false;
-      self.Module["postRun"] = Module.postRun;
-      self.Module["preRun"] = Module.preRun;
-      self.Module.callMain();
-    }
+    Module.setStatus("Loading Ghostscript...");
+    const wasmModule = await gs();
+    // copy source file to virtual filesystem
+    const FS = wasmModule.FS;
+    FS.writeFile = (path, content) => {
+      const stream = FS.open(path, 'w');
+      FS.write(stream, new Uint8Array([...content]), 0, content.length, 0);
+      FS.close(stream);
+    };
+    FS.readFile = (path, options = { encoding: 'utf8' }) => {
+      const stream = FS.open(path, 'r');
+      const buffer = new Uint8Array(FS.stat(path).size);
+      FS.read(stream, buffer, 0, buffer.length, 0);
+      FS.close(stream);
+
+      return options.encoding === 'utf8'
+        ? new TextDecoder('utf8').decode(buffer)
+        : buffer;
+    };
+    FS.writeFile("input.pdf", new Uint8Array(xhr.response));
+    // ghostscript arguments and run ghostscript
+    var gsargs = [
+      "-sDEVICE=pdfwrite",
+      "-dCompatibilityLevel=1.5",
+      "-dPDFSETTINGS=/ebook",
+      "-DNOPAUSE",
+      //"-dQUIET",
+      "-dBATCH",
+      "-sOutputFile=output.pdf",
+      "input.pdf",
+    ]
+    wasmModule.callMain(gsargs);
+    // make output file on virtual filesystem downloadable
+    var uarray = FS.readFile("output.pdf", {encoding: "binary"}); //Uint8Array
+    var blob = new Blob([uarray], {type: "application/octet-stream"});
+    var pdfDataURL = self.URL.createObjectURL(blob);
+    responseCallback({pdfDataURL: pdfDataURL, url: dataStruct.url});
   };
   xhr.send();
 }
 
-
-self.addEventListener('message', function({data:e}) {
+self.addEventListener('message', function ({data: e}) {
   console.log("message", e)
   // e.data contains the message sent to the worker.
-  if (e.target !== 'wasm'){
+  if (e.target !== 'wasm') {
     return;
   }
   console.log('Message received from main script', e.data);