From f5be2d62a3e0d02b5f92abb6ebda7d1a70426c2f Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 29 Sep 2019 23:50:58 +0200
Subject: [PATCH] Improve the heuristics, in
 `PartialEvaluator._buildSimpleFontToUnicode`, for glyphNames of the
 Cdd{d}/cdd{d} format (issue 9655)

*Please note:* I've been thinking about possible ways of addressing this issue for a while now, but all of the solutions I came up with became too complicated and thus hurt readability of the code.
However, it occured to me that we're essentially trying to add a heuristic *on top* of another heuristic, and that it shouldn't matter how efficient the code is as long as it works.

In the PDF file in the issue the Encoding contains glyphNames of the `Cdd` format, which our existing heuristics will treat as base 10 values. However, in this particular file they actually contain base 16 values, which we thus attempt to detect and fix such that text-selection works.
---
 src/core/evaluator.js           |  31 ++++++++++++++++++++++++-------
 test/pdfs/.gitignore            |   1 +
 test/pdfs/issue9655_reduced.pdf | Bin 0 -> 31518 bytes
 test/test_manifest.json         |   7 +++++++
 4 files changed, 32 insertions(+), 7 deletions(-)
 create mode 100644 test/pdfs/issue9655_reduced.pdf

diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 2c3c80964..9bc1e75ef 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -1977,7 +1977,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
      * @returns {ToUnicodeMap}
      * @private
      */
-    _buildSimpleFontToUnicode(properties) {
+    _buildSimpleFontToUnicode(properties, forceGlyphs = false) {
       assert(!properties.composite, 'Must be a simple font.');
 
       let toUnicode = [], charcode, glyphName;
@@ -2017,14 +2017,31 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
                 code = parseInt(glyphName.substring(1), 16);
               }
               break;
-            case 'C': // Cddd glyph
-            case 'c': // cddd glyph
-              if (glyphName.length >= 3) {
-                code = +glyphName.substring(1);
+            case 'C': // Cdd{d} glyph
+            case 'c': // cdd{d} glyph
+              if (glyphName.length >= 3 && glyphName.length <= 4) {
+                const codeStr = glyphName.substring(1);
+
+                if (forceGlyphs) {
+                  code = parseInt(codeStr, 16);
+                  break;
+                }
+                // Normally the Cdd{d}/cdd{d} glyphName format will contain
+                // regular, i.e. base 10, charCodes (see issue4550.pdf)...
+                code = +codeStr;
+
+                // ... however some PDF generators violate that assumption by
+                // containing glyph, i.e. base 16, codes instead.
+                // In that case we need to re-parse the *entire* encoding to
+                // prevent broken text-selection (fixes issue9655_reduced.pdf).
+                if (Number.isNaN(code) &&
+                    Number.isInteger(parseInt(codeStr, 16))) {
+                  return this._buildSimpleFontToUnicode(properties,
+                                                        /* forceGlyphs */ true);
+                }
               }
               break;
-            default:
-              // 'uniXXXX'/'uXXXX{XX}' glyphs
+            default: // 'uniXXXX'/'uXXXX{XX}' glyphs
               let unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
               if (unicode !== -1) {
                 code = unicode;
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 46f0aa1a6..0ca334476 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -73,6 +73,7 @@
 !issue9291.pdf
 !issue9418.pdf
 !issue9458.pdf
+!issue9655_reduced.pdf
 !issue9915_reduced.pdf
 !issue9940.pdf
 !issue10388_reduced.pdf
diff --git a/test/pdfs/issue9655_reduced.pdf b/test/pdfs/issue9655_reduced.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..535fc1acf55a80cf2204ba5643bb61f167ca4556
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diff --git a/test/test_manifest.json b/test/test_manifest.json
index 4d2e3d961..ada0a22c4 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -495,6 +495,13 @@
        "rounds": 1,
        "type": "text"
     },
+    {  "id": "issue9655-text",
+       "file": "pdfs/issue9655_reduced.pdf",
+       "md5": "87259a82cf3cda18e240517ca53c312a",
+       "rounds": 1,
+       "link": false,
+       "type": "text"
+    },
     {  "id": "jai-pdf",
        "file": "pdfs/jai.pdf",
        "md5": "1f5dd128c3757420a881a155f2f8ace3",