68 lines
2.0 KiB
JavaScript
68 lines
2.0 KiB
JavaScript
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// A re-implementation of "mutool merge" in JavaScript.
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function graftObject(dstDoc, srcDoc, srcObj, map) {
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var srcNum, dstRef, dstObj
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if (!map)
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map = []
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if (srcObj.isIndirect()) {
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srcNum = srcObj.toIndirect()
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if (map[srcNum])
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return map[srcNum]
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map[srcNum] = dstRef = dstDoc.createObject()
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dstRef.writeObject(graftObject(dstDoc, srcDoc, srcObj.resolve(), map))
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if (srcObj.isStream())
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dstRef.writeRawStream(srcObj.readRawStream())
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return dstRef
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}
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if (srcObj.isArray()) {
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dstObj = dstDoc.newArray()
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srcObj.forEach(function (key, val) {
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dstObj[key] = graftObject(dstDoc, srcDoc, val, map)
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})
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return dstObj
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}
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if (srcObj.isDictionary()) {
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dstObj = dstDoc.newDictionary()
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srcObj.forEach(function (key, val) {
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dstObj[key] = graftObject(dstDoc, srcDoc, val, map)
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})
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return dstObj
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}
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return srcObj /* primitive objects are not bound to a document */
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}
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function copyPage(dstDoc, srcDoc, pageNumber, map) {
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var srcPage, dstPage
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srcPage = srcDoc.findPage(pageNumber)
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dstPage = dstDoc.newDictionary()
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dstPage.Type = dstDoc.newName("Page")
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if (srcPage.MediaBox) dstPage.MediaBox = graftObject(dstDoc, srcDoc, srcPage.MediaBox, map)
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if (srcPage.Rotate) dstPage.Rotate = graftObject(dstDoc, srcDoc, srcPage.Rotate, map)
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if (srcPage.Resources) dstPage.Resources = graftObject(dstDoc, srcDoc, srcPage.Resources, map)
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if (srcPage.Contents) dstPage.Contents = graftObject(dstDoc, srcDoc, srcPage.Contents, map)
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dstDoc.insertPage(-1, dstDoc.addObject(dstPage))
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}
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function copyAllPages(dstDoc, srcDoc) {
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var k, n = srcDoc.countPages()
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var srcMap = []
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for (k = 0; k < n; ++k)
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copyPage(dstDoc, srcDoc, k, srcMap)
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}
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function pdfmerge() {
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var srcDoc, dstDoc, i
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dstDoc = new PDFDocument()
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for (i = 1; i < scriptArgs.length; ++i) {
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srcDoc = new PDFDocument(scriptArgs[i])
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copyAllPages(dstDoc, srcDoc)
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}
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dstDoc.save(scriptArgs[0], "compress")
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}
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if (scriptArgs.length < 2)
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print("usage: mutool run pdf-merge.js output.pdf input1.pdf input2.pdf ...")
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else
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pdfmerge()
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