Merge pull request #8847 from overleaf/jpa-emit-start-of-xref-table

[clsi] try to emit the start of the xref table

GitOrigin-RevId: 6d8348a349572cc997ac5924664428228c00fed1

services/clsi/app/js/ContentCacheManager.js

@@ -119,22 +119,26 @@ async function doUpdateInternal(contentDir, filePath, size, checkDeadline) {
 
   checkDeadline('after init HashFileTracker')
 
-  const rawTable = await parseXrefTable(filePath, size, checkDeadline)
-  rawTable.sort((a, b) => {
+  const { xRefEntries, startXRefTable } = await parseXrefTable(
+    filePath,
+    size,
+    checkDeadline
+  )
+  xRefEntries.sort((a, b) => {
     return a.offset - b.offset
   })
-  rawTable.forEach((obj, idx) => {
+  xRefEntries.forEach((obj, idx) => {
     obj.idx = idx
   })
 
   checkDeadline('after parsing')
 
   const uncompressedObjects = []
-  for (const object of rawTable) {
+  for (const object of xRefEntries) {
     if (!object.uncompressed) {
       continue
     }
-    const nextObject = rawTable[object.idx + 1]
+    const nextObject = xRefEntries[object.idx + 1]
     if (!nextObject) {
       // Ignore this possible edge case.
       // The last object should be part of the xRef table.
@@ -204,7 +208,7 @@ async function doUpdateInternal(contentDir, filePath, size, checkDeadline) {
   //       Let the next compile use the already written ranges.
   const reclaimedSpace = await tracker.deleteStaleHashes(5)
   await tracker.flush()
-  return [ranges, newRanges, reclaimedSpace]
+  return [ranges, newRanges, reclaimedSpace, startXRefTable]
 }
 
 function getStatePath(contentDir) {

services/clsi/app/js/OutputCacheManager.js

@@ -392,7 +392,12 @@ module.exports = OutputCacheManager = {
               return callback(null, outputFiles)
             }
             if (err) return callback(err, outputFiles)
-            const [contentRanges, newContentRanges, reclaimedSpace] = result
+            const [
+              contentRanges,
+              newContentRanges,
+              reclaimedSpace,
+              startXRefTable,
+            ] = result
 
             if (Settings.enablePdfCachingDark) {
               // In dark mode we are doing the computation only and do not emit
@@ -400,6 +405,7 @@ module.exports = OutputCacheManager = {
             } else {
               outputFile.contentId = Path.basename(contentDir)
               outputFile.ranges = contentRanges
+              outputFile.startXRefTable = startXRefTable
             }
 
             timings['compute-pdf-caching'] = timer.done()

services/clsi/app/lib/pdfjs/parseXrefTable.js

@@ -16,7 +16,9 @@ async function parseXrefTable(path, size, checkDeadline) {
     checkDeadline('pdfjs: after parseStartXRef')
     await manager.ensureDoc('parse')
     checkDeadline('pdfjs: after parse')
-    return manager.pdfDocument.catalog.xref.entries
+    const xRefEntries = manager.pdfDocument.xref.entries
+    const startXRefTable = manager.pdfDocument.xref.topDict?.get('Prev')
+    return { xRefEntries, startXRefTable }
   } finally {
     file.close()
   }

services/clsi/scripts/demo-pdfjs-Xref.js

@@ -5,7 +5,7 @@ const pdfPath = process.argv[2]
 
 async function main() {
   const size = (await fs.promises.stat(pdfPath)).size
-  const xRefEntries = await parseXrefTable(pdfPath, size)
+  const { xRefEntries } = await parseXrefTable(pdfPath, size)
   console.log('Xref entries', xRefEntries)
 }
 

services/clsi/test/unit/js/snapshots/pdfjs/asymptote/XrefTable.json

@@ -1,356 +1,359 @@
-[
-  {
-    "offset": 0,
-    "gen": 0,
-    "free": true
-  },
-  {
-    "offset": 123103,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 123422,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 15,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
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-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 1084,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
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-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 4001,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 4155,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
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-    "gen": 0,
-    "uncompressed": true
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-  {
-    "offset": 4933,
-    "gen": 0,
-    "uncompressed": true
-  },
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-    "gen": 0,
-    "uncompressed": true
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-    "gen": 0,
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-    "gen": 0,
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-    "gen": 0,
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-    "gen": 0,
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-    "gen": 0,
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-    "gen": 0,
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-    "gen": 0,
-    "uncompressed": true
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-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 97182,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
-    "offset": 104117,
-    "gen": 0,
-    "uncompressed": true
-  },
-  {
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-    "gen": 0,
-    "uncompressed": true
-  },
-  {
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-    "gen": 0,
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-  },
-  {
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-  },
-  {
-    "offset": 6,
-    "gen": 54
-  },
-  {
-    "offset": 6,
-    "gen": 55
-  }
-]
+{
+  "xRefEntries": [
+    {
+      "offset": 0,
+      "gen": 0,
+      "free": true
+    },
+    {
+      "offset": 123103,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 123422,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 15,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 216,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 1084,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 1244,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 4001,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 4155,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 4297,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 4933,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 5309,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 5498,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 30250,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 31471,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 38404,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 39046,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 40166,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 40906,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 65560,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 74702,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 97182,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 104117,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 111195,
+      "gen": 0,
+      "uncompressed": true
+    },
+    {
+      "offset": 118571,
+      "gen": 0,
+      "uncompressed": true
+    },
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+      "gen": 0
+    },
+    {
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+      "gen": 1
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+    {
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+      "gen": 2
+    },
+    {
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+      "gen": 3
+    },
+    {
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+      "gen": 4
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+    {
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+      "gen": 5
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+    },
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+    {
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+    {
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+    },
+    {
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+      "gen": 24
+    },
+    {
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+      "gen": 25
+    },
+    {
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+    },
+    {
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+      "gen": 27
+    },
+    {
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+    },
+    {
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+      "gen": 29
+    },
+    {
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+      "gen": 30
+    },
+    {
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+      "gen": 31
+    },
+    {
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+      "gen": 32
+    },
+    {
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+    },
+    {
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+    {
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+    },
+    {
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+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+      "gen": 42
+    },
+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+      "gen": 46
+    },
+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+      "gen": 50
+    },
+    {
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+      "gen": 51
+    },
+    {
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+    },
+    {
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+    },
+    {
+      "offset": 6,
+      "gen": 54
+    },
+    {
+      "offset": 6,
+      "gen": 55
+    }
+  ],
+  "startXRefTable": 123422
+}

services/clsi/test/unit/js/snapshots/pdfjs/biber_bibliography/XrefTable.json

@@ -1,145 +1,148 @@
-[
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-]
+{
+  "xRefEntries": [
+    {
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+      "gen": 0,
+      "free": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
+    },
+    {
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+      "gen": 0,
+      "uncompressed": true
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+    {
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+    {
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+    {
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+    {
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+      "gen": 0,
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+    {
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+    }
+  ],
+  "startXRefTable": 8578
+}

services/web/app/src/Features/Compile/ClsiManager.js

@@ -579,6 +579,7 @@ const ClsiManager = {
         f.contentId = file.contentId
         f.ranges = file.ranges || []
         f.size = file.size
+        f.startXRefTable = file.startXRefTable
         f.createdAt = new Date()
       }
       outputFiles.push(f)

services/web/test/unit/src/Compile/ClsiManagerTests.js

@@ -147,6 +147,7 @@ describe('ClsiManager', function () {
             // gets dropped by JSON.stringify
             contentId: undefined,
             size: undefined,
+            startXRefTable: undefined,
           },
           {
             url: `/project/${this.project_id}/user/${this.user_id}/build/1234/output/output.log`,
@@ -178,6 +179,7 @@ describe('ClsiManager', function () {
                   build: 1234,
                   contentId: '123-321',
                   ranges: [{ start: 1, end: 42, hash: 'foo' }],
+                  startXRefTable: 42,
                   size: 42,
                 },
                 {
@@ -209,6 +211,7 @@ describe('ClsiManager', function () {
             build: 1234,
             contentId: '123-321',
             ranges: [{ start: 1, end: 42, hash: 'foo' }],
+            startXRefTable: 42,
             size: 42,
             createdAt: new Date(),
           },
@@ -422,6 +425,7 @@ describe('ClsiManager', function () {
             // gets dropped by JSON.stringify
             contentId: undefined,
             size: undefined,
+            startXRefTable: undefined,
           },
           {
             url: `/project/${this.submission_id}/build/1234/output/output.log`,