From a07d2b4190bc0db778a254733dac88dccd5757fd Mon Sep 17 00:00:00 2001
From: m-holger <m-holger@kubitscheck.org>
Date: Tue, 4 Oct 2022 22:37:23 +0100
Subject: [PATCH] Only build QPDFTokenizer::val for name and string tokens

For all other token types val and raw_val are identical.
---
 libqpdf/QPDFTokenizer.cc | 41 ++++------------------------------------
 1 file changed, 4 insertions(+), 37 deletions(-)

diff --git a/libqpdf/QPDFTokenizer.cc b/libqpdf/QPDFTokenizer.cc
index b11ff0fc..b828691c 100644
--- a/libqpdf/QPDFTokenizer.cc
+++ b/libqpdf/QPDFTokenizer.cc
@@ -261,15 +261,11 @@ QPDFTokenizer::inBeforeToken(char ch)
         this->in_token = this->include_ignorable;
         if (this->include_ignorable) {
             this->state = st_in_space;
-            this->val += ch;
         }
     } else if (ch == '%') {
         this->before_token = !this->include_ignorable;
         this->in_token = this->include_ignorable;
         this->state = st_in_comment;
-        if (this->include_ignorable) {
-            this->val += ch;
-        }
     } else {
         this->before_token = false;
         this->in_token = true;
@@ -298,32 +294,27 @@ QPDFTokenizer::inTop(char ch)
         this->type = tt_bad;
         QTC::TC("qpdf", "QPDFTokenizer bad )");
         this->error_message = "unexpected )";
-        this->val += ch;
         this->state = st_token_ready;
         return;
 
     case '[':
         this->type = tt_array_open;
         this->state = st_token_ready;
-        this->val += ch;
         return;
 
     case ']':
         this->type = tt_array_close;
-        this->val += ch;
         this->state = st_token_ready;
         return;
 
     case '{':
         this->type = tt_brace_open;
         this->state = st_token_ready;
-        this->val += ch;
         return;
 
     case '}':
         this->type = tt_brace_close;
         this->state = st_token_ready;
-        this->val += ch;
         return;
 
     case '/':
@@ -342,23 +333,19 @@ QPDFTokenizer::inTop(char ch)
     case '8':
     case '9':
         this->state = st_number;
-        this->val += ch;
         return;
 
     case '+':
     case '-':
         this->state = st_sign;
-        this->val += ch;
         return;
 
     case '.':
         this->state = st_decimal;
-        this->val += ch;
         return;
 
     default:
         this->state = st_literal;
-        this->val += ch;
         return;
     }
 }
@@ -372,10 +359,6 @@ QPDFTokenizer::inSpace(char ch)
         this->in_token = false;
         this->char_to_unread = ch;
         this->state = st_token_ready;
-        return;
-    } else {
-        this->val += ch;
-        return;
     }
 }
 
@@ -391,8 +374,6 @@ QPDFTokenizer::inComment(char ch)
         } else {
             this->state = st_before_token;
         }
-    } else if (this->include_ignorable) {
-        this->val += ch;
     }
 }
 
@@ -527,10 +508,8 @@ QPDFTokenizer::inSign(char ch)
 {
     if (QUtil::is_digit(ch)) {
         this->state = st_number;
-        this->val += ch;
     } else if (ch == '.') {
         this->state = st_decimal;
-        this->val += ch;
     } else {
         this->state = st_literal;
         inLiteral(ch);
@@ -542,7 +521,6 @@ QPDFTokenizer::inDecimal(char ch)
 {
     if (QUtil::is_digit(ch)) {
         this->state = st_real;
-        this->val += ch;
     } else {
         this->state = st_literal;
         inLiteral(ch);
@@ -553,10 +531,8 @@ void
 QPDFTokenizer::inNumber(char ch)
 {
     if (QUtil::is_digit(ch)) {
-        this->val += ch;
     } else if (ch == '.') {
         this->state = st_real;
-        this->val += ch;
     } else if (isDelimiter(ch)) {
         this->type = tt_integer;
         this->state = st_token_ready;
@@ -564,7 +540,6 @@ QPDFTokenizer::inNumber(char ch)
         this->char_to_unread = ch;
     } else {
         this->state = st_literal;
-        this->val += ch;
     }
 }
 
@@ -572,7 +547,6 @@ void
 QPDFTokenizer::inReal(char ch)
 {
     if (QUtil::is_digit(ch)) {
-        this->val += ch;
     } else if (isDelimiter(ch)) {
         this->type = tt_real;
         this->state = st_token_ready;
@@ -580,7 +554,6 @@ QPDFTokenizer::inReal(char ch)
         this->char_to_unread = ch;
     } else {
         this->state = st_literal;
-        this->val += ch;
     }
 }
 void
@@ -649,7 +622,6 @@ void
 QPDFTokenizer::inLt(char ch)
 {
     if (ch == '<') {
-        this->val += "<<";
         this->type = tt_dict_open;
         this->state = st_token_ready;
         return;
@@ -663,11 +635,9 @@ void
 QPDFTokenizer::inGt(char ch)
 {
     if (ch == '>') {
-        this->val += ">>";
         this->type = tt_dict_close;
         this->state = st_token_ready;
     } else {
-        this->val += ">";
         this->type = tt_bad;
         QTC::TC("qpdf", "QPDFTokenizer bad >");
         this->error_message = "unexpected >";
@@ -692,11 +662,9 @@ QPDFTokenizer::inLiteral(char ch)
         this->in_token = false;
         this->char_to_unread = ch;
         this->state = st_token_ready;
-        this->type = (this->val == "true") || (this->val == "false")
+        this->type = (this->raw_val == "true") || (this->raw_val == "false")
             ? tt_bool
-            : (this->val == "null" ? tt_null : tt_word);
-    } else {
-        this->val += ch;
+            : (this->raw_val == "null" ? tt_null : tt_word);
     }
 }
 
@@ -783,8 +751,7 @@ QPDFTokenizer::inCharCode(char ch)
 void
 QPDFTokenizer::inInlineImage(char ch)
 {
-    this->val += ch;
-    if (this->val.length() == this->inline_image_bytes) {
+    if ((this->raw_val.length() + 1) == this->inline_image_bytes) {
         QTC::TC("qpdf", "QPDFTokenizer found EI by byte count");
         this->type = tt_inline_image;
         this->inline_image_bytes = 0;
@@ -951,7 +918,7 @@ QPDFTokenizer::getToken(Token& token, bool& unread_char, char& ch)
     unread_char = !this->in_token && !this->before_token;
     ch = this->char_to_unread;
     if (ready) {
-        token = (this->type == tt_bad)
+        token = (!(this->type == tt_name || this->type == tt_string))
             ? Token(
                   this->type, this->raw_val, this->raw_val, this->error_message)
             : Token(this->type, this->val, this->raw_val, this->error_message);