1 files changed, 45 insertions, 0 deletions
diff --git a/include/io/zlib_streambuf.h b/include/io/zlib_streambuf.h
new file mode 100644
index 0000000000..36062192b7
--- /dev/null
+++ b/include/io/zlib_streambuf.h
@@ -0,0 +1,45 @@
+#ifndef ZLIB_STREAMBUF_H_INCLUDED
+#define ZLIB_STREAMBUF_H_INCLUDED
+
+#include <stdexcept>
+#include <streambuf>
+#include <vector>
+#include <zlib.h>
+
+namespace zlib
+{
+
+///Exception thrown in case zlib encounters a problem
+class zlib_error : public std::runtime_error
+{
+public:
+    const int errcode;
+
+    explicit zlib_error(const char* msg, int errcode):
+        std::runtime_error(msg
+                         ? std::string(zError(errcode)) + ": " + msg
+                         : zError(errcode)),
+        errcode(errcode)
+    {}
+};
+
+///Base class for deflate_streambuf and inflate_streambuf
+class zlib_streambuf : public std::streambuf
+{
+protected:
+    std::vector<char> in;
+    std::vector<char> out;
+    z_stream zstr;
+
+    explicit zlib_streambuf(size_t bufsize):
+        in(bufsize), out(bufsize)
+    {
+        zstr.zalloc = Z_NULL;
+        zstr.zfree = Z_NULL;
+        zstr.opaque = Z_NULL;
+    }
+};
+
+}
+
+#endif // ZLIB_STREAMBUF_H_INCLUDED