From 7c879fa8d9f609ecc29c13e1c59ce309b9eeb046 Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspreemann@gmail.com>
Date: Mon, 16 Oct 2017 17:07:15 +0200
Subject: Boost-less endian conversion.

---
 ripser.cpp | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/ripser.cpp b/ripser.cpp
index b0257c8..a3d5318 100644
--- a/ripser.cpp
+++ b/ripser.cpp
@@ -37,10 +37,6 @@ with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <sstream>
 #include <unordered_map>
 
-#ifndef FORCE_NATIVE_ENDIANNESS
-#include <boost/endian/conversion.hpp>
-#endif
-
 #ifdef USE_GOOGLE_HASHMAP
 #include <sparsehash/sparse_hash_map>
 template <class Key, class T> class hash_map : public google::sparse_hash_map<Key, T> {
@@ -109,18 +105,23 @@ std::vector<coefficient_t> multiplicative_inverse_vector(const coefficient_t m)
 	return inverse;
 }
 
+template <typename T> inline void reverse_endianness(T & x) {
+        uint8_t * p = reinterpret_cast<uint8_t *>(&x);
+        std::reverse(p, p + sizeof(T));
+}
+
 template <typename T> T read(std::istream& s) {
 	T result;
 	s.read(reinterpret_cast<char*>(&result), sizeof(T));
-        #ifndef FORCE_NATIVE_ENDIANNESS
-        boost::endian::little_to_native_inplace(result);
+        #ifdef BIGENDIAN
+        reverse_endianness(result);
         #endif
         return result;
 }
 
 template <typename T> void write(std::ostream& s, T value) {
-        #ifndef FORCE_NATIVE_ENDIANNESS
-        boost::endian::native_to_little_inplace(value);
+        #ifdef BIGENDIAN
+        reverse_endianness(value);
         #endif
 	s.write(reinterpret_cast<char*>(&value), sizeof(T));
 }
-- 
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