Fix EOL handling inside strings (fixes #226)

CR, CRLF, and LF are all supposed to be treated as LF; only one EOL is to be ignored after backslash.

Fix EOL handling inside strings (fixes #226)
CR, CRLF, and LF are all supposed to be treated as LF; only one EOL is to be ignored after backslash.
Jay Berkenbilt
1 parent 1619cad1
Showing 10 changed files with 1084 additions and 1039 deletions
ChangeLog
include/qpdf/QPDFTokenizer.hh
libqpdf/QPDFTokenizer.cc
qpdf/qtest/qpdf/good14.out
qpdf/qtest/qpdf/good14.pdf
qpdf/qtest/qpdf/good14.qdf
qpdf/qtest/qpdf/tokens-maxlen.out
qpdf/qtest/qpdf/tokens-no-ignorable.out
qpdf/qtest/qpdf/tokens.out
qpdf/qtest/qpdf/tokens.pdf
 2018-08-05  Jay Berkenbilt  <ejb@ql.org>
+	* Bug fix: end of line characters were not properly handled inside
+	strings in some cases. Fixes #226.
+
 	* Bug fix: infinite loop on progress reporting for very small
 	files. Fixes #230.
@@ -229,6 +229,7 @@ class QPDFTokenizer
         bool string_ignoring_newline;
         char bs_num_register[4];
         bool last_char_was_bs;
+        bool last_char_was_cr;
     };
     PointerHolder<Members> m;
 };
@@ -34,6 +34,7 @@ QPDFTokenizer::Members::reset()
     string_depth = 0;
     string_ignoring_newline = false;
     last_char_was_bs = false;
+    last_char_was_cr = false;
 }
 QPDFTokenizer::Members::~Members()
@@ -217,6 +218,7 @@ QPDFTokenizer::presentCharacter(char ch)
 	    memset(this->m->bs_num_register, '\0',
                    sizeof(this->m->bs_num_register));
 	    this->m->last_char_was_bs = false;
+	    this->m->last_char_was_cr = false;
 	    this->m->state = st_in_string;
 	}
 	else if (ch == '<')
@@ -334,8 +336,7 @@ QPDFTokenizer::presentCharacter(char ch)
     }
     else if (this->m->state == st_in_string)
     {
-	if (this->m->string_ignoring_newline &&
-            (! ((ch == '\r') || (ch == '\n'))))
+	if (this->m->string_ignoring_newline && (ch != '\n'))
 	{
 	    this->m->string_ignoring_newline = false;
 	}
@@ -353,9 +354,10 @@ QPDFTokenizer::presentCharacter(char ch)
 	    bs_num_count = 0;
 	}
-	if (this->m->string_ignoring_newline && ((ch == '\r') || (ch == '\n')))
+	if (this->m->string_ignoring_newline && (ch == '\n'))
 	{
 	    // ignore
+            this->m->string_ignoring_newline = false;
 	}
 	else if (ch_is_octal &&
                  (this->m->last_char_was_bs || (bs_num_count > 0)))
@@ -386,8 +388,10 @@ QPDFTokenizer::presentCharacter(char ch)
 		this->m->val += '\f';
 		break;
-	      case '\r':
 	      case '\n':
+                break;
+
+	      case '\r':
 		this->m->string_ignoring_newline = true;
 		break;
@@ -417,11 +421,26 @@ QPDFTokenizer::presentCharacter(char ch)
 	    this->m->type = tt_string;
 	    this->m->state = st_token_ready;
 	}
+        else if (ch == '\r')
+        {
+            // CR by itself is converted to LF
+            this->m->val += '\n';
+        }
+        else if (ch == '\n')
+        {
+            // CR LF is converted to LF
+            if (! this->m->last_char_was_cr)
+            {
+                this->m->val += ch;
+            }
+        }
 	else
 	{
 	    this->m->val += ch;
 	}
+        this->m->last_char_was_cr =
+            ((! this->m->string_ignoring_newline) && (ch == '\r'));
 	this->m->last_char_was_bs =
             ((! this->m->last_char_was_bs) && (ch == '\\'));
     }
@@ -6,7 +6,7 @@ A B
 one
 two
 three lines
-(string with \r\nCRNL)
+(string with \nCRLF and\nCR and\nLF)
  and another
    indentation
 (\001B%DEF)<01>
@@ -21,7 +21,7 @@ This stream does end with a newline.
 //   bad tokens preserved
 //   comments
 //   indentation
-//   CR/NL inside string literal -- changed to \r or \n, newline follows
+//   CR, CR/LF, LF inside string literal -- changed to \n
 //   whitespace in hexstring (removed)
 //   strings normalized
 //   newlines normalized
@@ -33,17 +33,17 @@ This stream does end with a newline.
 /good name
 /bad#00name
-WARNING: good14.pdf (offset 860): content normalization encountered bad tokens
-WARNING: good14.pdf (offset 860): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
+WARNING: good14.pdf (offset 874): content normalization encountered bad tokens
+WARNING: good14.pdf (offset 874): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
 -- stream 2 --
 (This stream ends with a \001 bad token
-WARNING: good14.pdf (offset 1316): content normalization encountered bad tokens
-WARNING: good14.pdf (offset 1316): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
-WARNING: good14.pdf (offset 1316): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
+WARNING: good14.pdf (offset 1315): content normalization encountered bad tokens
+WARNING: good14.pdf (offset 1315): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
+WARNING: good14.pdf (offset 1315): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
 -- stream 3 --
-<AB XWARNING: good14.pdf (offset 1406): content normalization encountered bad tokens
-WARNING: good14.pdf (offset 1406): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
-WARNING: good14.pdf (offset 1406): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
+<AB XWARNING: good14.pdf (offset 1405): content normalization encountered bad tokens
+WARNING: good14.pdf (offset 1405): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
+WARNING: good14.pdf (offset 1405): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
 -- stream 4 --
 (ends with a name)
 /ThisMustBeLast-- stream 5 --
@@ -54,7 +54,7 @@ BI
 ID
 <506f7
 461746f>
-WARNING: good14.pdf (offset 1549): content normalization encountered bad tokens
-WARNING: good14.pdf (offset 1549): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
-WARNING: good14.pdf (offset 1549): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
+WARNING: good14.pdf (offset 1548): content normalization encountered bad tokens
+WARNING: good14.pdf (offset 1548): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
+WARNING: good14.pdf (offset 1548): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
 test 3 done
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-216: space:  
-217: bool: false
-222: space:  
-223: word: three
-228: space:  
-229: null: null
-233: space:  
-234: word: four
-238: space: \x0a
-239: word: !@#$^&
-245: brace_open: {
-246: brace_close: }
-247: word: *-_+=
-252: space: \x0a
-253: word: abc123def3.14true
-270: space: \x0a
-271: bad: <ff\x0a (EOF while reading token)
-275: eof
+168: real: +3.14
+173: space: \x0a  
+176: real: +3.
+179: space: \x0a  
+182: real: +.14
+186: space: \x0a  
+189: real: -3.14
+194: space: \x0a  
+197: real: -3.
+200: space: \x0a  
+203: real: -.14
+207: space: \x0a  
+210: integer: +16059
+216: space: \x0a  
+219: integer: -16059
+225: space: \x0a  
+228: word: +.
+230: space: \x0a  
+233: bad: <fade\x0aET (invalid character (T) in hexstring)
+241: space: \x0a
+242: bad: ) (unexpected ))
+243: bad: > (unexpected >)
+244: word: quack
+249: space:  
+250: bad: /name#oops (invalid name token)
+260: space:  
+261: name: /name (raw: /n#61me)
+268: space:  
+269: word: one
+272: space:  
+273: bool: true
+277: space:  
+278: word: two
+281: space:  
+282: bool: false
+287: space:  
+288: word: three
+293: space:  
+294: null: null
+298: space:  
+299: word: four
+303: space: \x0a
+304: word: !@#$^&
+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
 --- END PAGE 4 ---
 --- BEGIN PAGE 5 ---
 0: word: BT