From 83026d0f664b69cc8ed74b1ed52df212f0a66ab7 Mon Sep 17 00:00:00 2001
From: Alan Conway <aconway@apache.org>
Date: Thu, 3 Apr 2008 22:19:47 +0000
Subject: qpid/Serializer.h, qpid/amqp_0_10/Codec.h:  - serializer enforces
 overrunning encode/decode limits.

tests/amqp_0_10: Moved unit tests for amqp_0_10 namespace into amqp_0_10 directory.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@644533 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/Serializer.h      | 47 ++++++++++++++++++++++++++++++++++++++++++
 cpp/src/qpid/amqp_0_10/Codec.h | 34 +++++++++++++++++++++---------
 2 files changed, 71 insertions(+), 10 deletions(-)

(limited to 'cpp/src/qpid')

diff --git a/cpp/src/qpid/Serializer.h b/cpp/src/qpid/Serializer.h
index 6ff701f346..d3e5264864 100644
--- a/cpp/src/qpid/Serializer.h
+++ b/cpp/src/qpid/Serializer.h
@@ -23,6 +23,7 @@
  */
 
 #include <algorithm>
+#include "qpid/Exception.h"     // FIXME aconway 2008-04-03: proper exception class.
 
 namespace qpid {
 
@@ -52,6 +53,23 @@ SerializablePair<T,U> serializable(std::pair<T,U>& p) {
  */
 template <class Derived> class Serializer {
   public:
+    /** Temporarily set a lower relative limit on the serializer */
+    class ScopedLimit {
+      public:
+        ScopedLimit(Serializer& s, size_t l)
+            : serializer(s), save(serializer.setLimit(l)) {}
+        
+        ~ScopedLimit() { serializer.setAbsLimit(save); }
+        
+      private:
+        Serializer& serializer;
+        size_t save;
+    };
+
+    static const size_t maxLimit() { return  std::numeric_limits<size_t>::max(); }
+    
+    Serializer() : bytes(0), limit(maxLimit()) {}
+    
     typedef Derived& result_type; // unary functor requirement.
 
     /** Wrapper functor to pass serializer functors by reference. */
@@ -74,8 +92,37 @@ template <class Derived> class Serializer {
         return self();
     }
 
+    /** Set limit relative to current position.
+     * @return old absolute limit.
+     */
+    size_t setLimit(size_t n) {
+        size_t l=limit;
+        limit = bytes+n;
+        return l;
+    }
+
+    /** Set absolute limit. */
+    void setAbsLimit(size_t n) {
+        limit = n;
+        if (bytes > limit)
+            throw Exception("Framing error: data overrun"); // FIXME aconway 2008-04-03: proper exception.
+    }
+
   protected:
     Derived& self() { return *static_cast<Derived*>(this); }
+    void addBytes(size_t n) {
+        size_t newBytes=bytes+n;
+        if (newBytes > limit)
+            throw Exception("Framing error: data overrun"); // FIXME aconway 2008-04-03: proper exception.
+        bytes = newBytes;
+    }
+    
+  private:
+    void checkLimit() {
+    }
+        
+    size_t bytes;               // how many bytes serialized.
+    size_t limit;               // bytes may not exceed this limit.
 };
 
 /**
diff --git a/cpp/src/qpid/amqp_0_10/Codec.h b/cpp/src/qpid/amqp_0_10/Codec.h
index a819aec845..622032fddc 100644
--- a/cpp/src/qpid/amqp_0_10/Codec.h
+++ b/cpp/src/qpid/amqp_0_10/Codec.h
@@ -52,16 +52,21 @@ struct Codec {
     class Encoder : public EncoderBase<Encoder<OutIter> >
     {
       public:
-        Encoder(OutIter o) : out(o) {}
+        typedef EncoderBase<Encoder<OutIter> > Base;
+        typedef OutIter Iterator;
+        
+        Encoder(OutIter o, size_t limit=Base::maxLimit()) : out(o) {
+            this->setLimit(limit);
+        }
 
         using EncoderBase<Encoder<OutIter> >::operator();
 
         // FIXME aconway 2008-03-10:  wrong encoding, need packing support
-        Encoder& operator()(bool x) { *out++=x; return *this;} 
+        Encoder& operator()(bool x) { raw(x); return *this;} 
 
-        Encoder& operator()(char x) { *out++=x; return *this; }
-        Encoder& operator()(int8_t x) { *out++=x; return *this; }
-        Encoder& operator()(uint8_t x) { *out++=x; return *this; }
+        Encoder& operator()(char x) { raw(x); return *this; }
+        Encoder& operator()(int8_t x) { raw(x); return *this; }
+        Encoder& operator()(uint8_t x) { raw(x); return *this; }
 
         Encoder& operator()(int16_t x) { return endian(x); }
         Encoder& operator()(int32_t x) { return endian(x); }
@@ -76,9 +81,12 @@ struct Codec {
 
 
         void raw(const void* p, size_t n) {
+            this->addBytes(n);
             out = std::copy((const char*)p, (const char*)p+n, out);
         }
 
+        void raw(char b) { this->addBytes(1); *out++=b; }
+
         OutIter pos() const { return out; }
 
       private:
@@ -93,18 +101,21 @@ struct Codec {
     template <class InIter>
     class Decoder : public DecoderBase<Decoder<InIter> > {
       public:
+        typedef DecoderBase<Decoder<InIter> > Base;
         typedef InIter Iterator;
         
-        Decoder(InIter i) : in(i) {}
+        Decoder(InIter i, size_t limit=Base::maxLimit()) : in(i) {
+            this->setLimit(limit);
+        }
 
         using DecoderBase<Decoder<InIter> >::operator();
         
         // FIXME aconway 2008-03-10:  wrong encoding, need packing support
-        Decoder& operator()(bool& x) { x=*in++; return *this; }
+        Decoder& operator()(bool& x) { raw((char&)x); return *this; }
 
-        Decoder& operator()(char& x) { x=*in++; return *this; }
-        Decoder& operator()(int8_t& x) { x=*in++; return *this; }
-        Decoder& operator()(uint8_t& x) { x=*in++; return *this; }
+        Decoder& operator()(char& x) { raw((char&)x); return *this; }
+        Decoder& operator()(int8_t& x) { raw((char&)x); return *this; }
+        Decoder& operator()(uint8_t& x) { raw((char&)x); return *this; }
 
         Decoder& operator()(int16_t& x) { return endian(x); }
         Decoder& operator()(int32_t& x) { return endian(x); }
@@ -118,10 +129,13 @@ struct Codec {
         Decoder& operator()(double& x) { return endian(x); }
 
         void raw(void *p, size_t n) {
+            this->addBytes(n);
             std::copy(in, in+n, (char*)p);
             std::advance(in, n);
         }
 
+        void raw(char &b) { this->addBytes(1); b=*in++; }
+            
         InIter pos() const { return in; }
 
       private:
-- 
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