commit 6f9f259034de956ad7db69151755250e98727a1d
Author: David Benjamin <davidben@mit.edu>
Date:   Sat Jun 20 17:05:49 2009 -0400

    Make DecryptStream return sane values for getPos()
    
    Many streams (notably JBIG2Stream) expect wrapped streams to return correct
    values for getPos(), i.e. increments by 1 when readChar() called, etc. Fixes
    bug #19706.

diff --git a/poppler/Decrypt.cc b/poppler/Decrypt.cc
index 8719539..c1a80b8 100644
--- a/poppler/Decrypt.cc
+++ b/poppler/Decrypt.cc
@@ -237,6 +237,7 @@ DecryptStream::~DecryptStream() {
 void DecryptStream::reset() {
   int i;
 
+  charactersRead = 0;
   str->reset();
   switch (algo) {
   case cryptRC4:
@@ -254,6 +255,10 @@ void DecryptStream::reset() {
   }
 }
 
+int DecryptStream::getPos() {
+  return charactersRead;
+}
+
 int DecryptStream::getChar() {
   Guchar in[16];
   int c, i;
@@ -288,6 +293,8 @@ int DecryptStream::getChar() {
     }
     break;
   }
+  if (c != EOF)
+    charactersRead++;
   return c;
 }
 
diff --git a/poppler/Decrypt.h b/poppler/Decrypt.h
index 6716f72..d4693df 100644
--- a/poppler/Decrypt.h
+++ b/poppler/Decrypt.h
@@ -90,6 +90,7 @@ public:
   virtual void reset();
   virtual int getChar();
   virtual int lookChar();
+  virtual int getPos();
   virtual GBool isBinary(GBool last);
   virtual Stream *getUndecodedStream() { return this; }
 
@@ -98,6 +99,7 @@ private:
   CryptAlgorithm algo;
   int objKeyLength;
   Guchar objKey[16 + 9];
+  int charactersRead; // so that getPos() can be correct
 
   union {
     DecryptRC4State rc4;