From c4a40949d945b4a3be85ad68b8cfb449843f34a6 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 1 Mar 2017 13:52:54 +0100
Subject: Handle importing NARs containing files greater than 4 GiB

Also templatize readInt() to work for various integer types.
---
 src/libutil/serialise.hh | 54 ++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 50 insertions(+), 4 deletions(-)

(limited to 'src/libutil/serialise.hh')

diff --git a/src/libutil/serialise.hh b/src/libutil/serialise.hh
index 5646d08c1314..3072f422ea93 100644
--- a/src/libutil/serialise.hh
+++ b/src/libutil/serialise.hh
@@ -177,18 +177,64 @@ Sink & operator << (Sink & sink, const Strings & s);
 Sink & operator << (Sink & sink, const StringSet & s);
 
 
+MakeError(SerialisationError, Error)
+
+
+template<typename T>
+T readNum(Source & source)
+{
+    unsigned char buf[8];
+    source(buf, sizeof(buf));
+
+    uint64_t n =
+        ((unsigned long long) buf[0]) |
+        ((unsigned long long) buf[1] << 8) |
+        ((unsigned long long) buf[2] << 16) |
+        ((unsigned long long) buf[3] << 24) |
+        ((unsigned long long) buf[4] << 32) |
+        ((unsigned long long) buf[5] << 40) |
+        ((unsigned long long) buf[6] << 48) |
+        ((unsigned long long) buf[7] << 56);
+
+    if (n > std::numeric_limits<T>::max())
+        throw SerialisationError("serialised integer %d is too large for type ‘%s’", n, typeid(T).name());
+
+    return n;
+}
+
+
+inline unsigned int readInt(Source & source)
+{
+    return readNum<unsigned int>(source);
+}
+
+
+inline uint64_t readLongLong(Source & source)
+{
+    return readNum<uint64_t>(source);
+}
+
+
 void readPadding(size_t len, Source & source);
-unsigned int readInt(Source & source);
-unsigned long long readLongLong(Source & source);
 size_t readString(unsigned char * buf, size_t max, Source & source);
 string readString(Source & source);
 template<class T> T readStrings(Source & source);
 
 Source & operator >> (Source & in, string & s);
-Source & operator >> (Source & in, unsigned int & n);
 
+template<typename T>
+Source & operator >> (Source & in, T & n)
+{
+    n = readNum<T>(in);
+    return in;
+}
 
-MakeError(SerialisationError, Error)
+template<typename T>
+Source & operator >> (Source & in, bool & b)
+{
+    b = readNum<uint64_t>(in);
+    return in;
+}
 
 
 }
-- 
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