Don't lose character after \d or \dd parsing string (fixes #1050)

Jay Berkenbilt
1 parent 467e5d62
Showing 8 changed files with 1043 additions and 1003 deletions
ChangeLog
libqpdf/QPDFTokenizer.cc
qpdf/qtest/qpdf/tokens-maxlen.out
qpdf/qtest/qpdf/tokens-no-ignorable.out
qpdf/qtest/qpdf/tokens.out
qpdf/qtest/qpdf/tokens.pdf
qpdf/qtest/tokenizer.test
qpdf/test_driver.cc
+2023-10-14  Jay Berkenbilt  <ejb@ql.org>
+
+        * Fix serious bug: qpdf could discard a the character after an
+        escaped octal string. For content, this would only happen with QDF
+        or when normalizing content, but it could have happened in a
+        binary string. This bug was introduced between 10.6.3 and 11.0.0.
+        Fixes #1050.
+
 2023-10-07  Jay Berkenbilt  <ejb@ql.org>
         * 11.6.2: release
@@ -145,9 +145,8 @@ QPDFTokenizer::presentCharacter(char ch)
 void
 QPDFTokenizer::handleCharacter(char ch)
 {
-    // State machine is implemented such that the final character may not be handled.  This happens
-    // whenever you have to use a character from the next token to detect the end of the current
-    // token.
+    // In some cases, functions called below may call a second handler. This happens whenever you
+    // have to use a character from the next token to detect the end of the current token.
     switch (this->state) {
     case st_top:
@@ -692,16 +691,21 @@ QPDFTokenizer::inHexstring2nd(char ch)
 void
 QPDFTokenizer::inCharCode(char ch)
 {
+    bool handled = false;
     if (('0' <= ch) && (ch <= '7')) {
         this->char_code = 8 * this->char_code + (int(ch) - int('0'));
         if (++(this->digit_count) < 3) {
             return;
         }
-        // We've accumulated \ddd.  PDF Spec says to ignore high-order overflow.
+        handled = true;
     }
+    // We've accumulated \ddd or we have \d or \dd followed by other than an octal digit. The PDF
+    // Spec says to ignore high-order overflow.
     this->val += char(this->char_code % 256);
     this->state = st_in_string;
-    return;
+    if (!handled) {
+        inString(ch);
+    }
 }
 void
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 skipping to endstream
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+9558: eof
 --- END FILE ---
 --- BEGIN PAGE 1 ---
 0: word: BT
@@ -669,69 +669,73 @@ skipping to endstream
 117: space: \x0a  
 120: string: qu\x0a\x0a\x0a\x0a\x0a\x0aack (raw: (qu\x0a\x0d\x0a\x0a\x0d\x0d\x0a\x0aack))
 135: space: \x0a  
-138: integer: 72
-140: space:  
-141: integer: 720
-144: space:  
-145: word: Td
-147: space: \x0a  
-150: real: 3.14
-154: space: \x0a  
-157: real: 3.
-159: space: \x0a  
-162: real: .14
-165: space: \x0a  
-168: real: +3.14
-173: space: \x0a  
-176: real: +3.
-179: space: \x0a  
-182: real: +.14
-186: space: \x0a  
-189: real: -3.14
-194: space: \x0a  
-197: real: -3.
-200: space: \x0a  
-203: real: -.14
-207: space: \x0a  
-210: integer: +16059
-216: space: \x0a  
-219: integer: -16059
-225: space: \x0a  
-228: word: +.
-230: space: \x0a  
-233: bad: <fade\x0aET (invalid character (T) in hexstring)
-241: space: \x0a
-242: bad: ) (unexpected ))
-243: bad: > (unexpected >)
-244: word: quack
-249: space:  
-250: name: /name\x00oops (raw: /name#oops) (name with stray # will not work with PDF >= 1.2)
-260: space:  
-261: name: /name (raw: /n#61me)
-268: space:  
-269: word: one
-272: space:  
-273: bool: true
-277: space:  
-278: word: two
-281: space:  
-282: bool: false
-287: space:  
-288: word: three
-293: space:  
-294: null: null
-298: space:  
-299: word: four
-303: space: \x0a
-304: word: !@#$^&
-310: brace_open: {
-311: brace_close: }
-312: word: *-_+=
-317: space: \x0a
-318: word: abc123def3.14true
-335: space: \x0a
-336: bad: <ff\x0a (EOF while reading token)
-340: eof
+138: string: \x048!8Q\x04!Q\x04 (raw: (\48\418\121\4\41\121\4))
+162: space: \x0a  
+165: string: \x048!8Q\x04!Q! (raw: (\48\418\121\4\41\121\41))
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+234: space: \x0a  
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+274: integer: -16059
+280: space: \x0a  
+283: word: +.
+285: space: \x0a  
+288: bad: <fade\x0aET (invalid character (T) in hexstring)
+296: space: \x0a
+297: bad: ) (unexpected ))
+298: bad: > (unexpected >)
+299: word: quack
+304: space:  
+305: name: /name\x00oops (raw: /name#oops) (name with stray # will not work with PDF >= 1.2)
+315: space:  
+316: name: /name (raw: /n#61me)
+323: space:  
+324: word: one
+327: space:  
+328: bool: true
+332: space:  
+333: word: two
+336: space:  
+337: bool: false
+342: space:  
+343: word: three
+348: space:  
+349: null: null
+353: space:  
+354: word: four
+358: space: \x0a
+359: word: !@#$^&
+365: brace_open: {
+366: brace_close: }
+367: word: *-_+=
+372: space: \x0a
+373: word: abc123def3.14true
+390: space: \x0a
+391: bad: <ff\x0a (EOF while reading token)
+395: eof
 --- END PAGE 4 ---
 --- BEGIN PAGE 5 ---
 0: word: BT
@@ -14,7 +14,7 @@ cleanup();
 my $td = new TestDriver('tokenizer');
-my $n_tests = 4;
+my $n_tests = 5;
 $td->runtest("tokenizer with no ignorable",
              {$td->COMMAND => "test_tokenizer -no-ignorable tokens.pdf"},
@@ -38,5 +38,11 @@ $td-&gt;runtest(&quot;ignore bad token&quot;,
               $td->EXIT_STATUS => 0},
              $td->NORMALIZE_NEWLINES);
+$td->runtest("quoted char edge cases",
+             {$td->COMMAND => "test_driver 96 -"},
+             {$td->STRING => "test 96 done\n",
+              $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+
 cleanup();
 $td->report($n_tests);
@@ -3341,6 +3341,17 @@ test_95(QPDF&amp; pdf, char const* arg2)
     assert(!oh_d.isScalar());
 }
+static void
+test_96(QPDF& pdf, char const* arg2)
+{
+    // Test edge cases with quoted characters
+
+    auto s = R"((\48\418\121\4))"_qpdf;
+    assert(s.unparseBinary() == "<043821385104>");
+    s = R"((\48\418\121\41))"_qpdf;
+    assert(s.unparseBinary() == "<043821385121>");
+}
+
 void
 runtest(int n, char const* filename1, char const* arg2)
 {
@@ -3348,7 +3359,7 @@ runtest(int n, char const* filename1, char const* arg2)
     // the test suite to see how the test is invoked to find the file
     // that the test is supposed to operate on.
-    std::set<int> ignore_filename = {61, 81, 83, 84, 85, 86, 87, 92, 95};
+    std::set<int> ignore_filename = {61, 81, 83, 84, 85, 86, 87, 92, 95, 96};
     if (n == 0) {
         // Throw in some random test cases that don't fit anywhere
@@ -3441,7 +3452,8 @@ runtest(int n, char const* filename1, char const* arg2)
         {72, test_72}, {73, test_73}, {74, test_74}, {75, test_75}, {76, test_76}, {77, test_77},
         {78, test_78}, {79, test_79}, {80, test_80}, {81, test_81}, {82, test_82}, {83, test_83},
         {84, test_84}, {85, test_85}, {86, test_86}, {87, test_87}, {88, test_88}, {89, test_89},
-        {90, test_90}, {91, test_91}, {92, test_92}, {93, test_93}, {94, test_94}, {95, test_95}};
+        {90, test_90}, {91, test_91}, {92, test_92}, {93, test_93}, {94, test_94}, {95, test_95},
+        {96, test_96}};
     auto fn = test_functions.find(n);
     if (fn == test_functions.end()) {