Add trivial zlib wrapper

Makefile.am

@@ -139,7 +139,9 @@ UTIL_FILES   =		\
     vector.cpp		\
     vector.hpp		\
     version.cpp		\
-    version.hpp
+    version.hpp		\
+    zlib.cpp		\
+    zlib.hpp
 
 
 if PLATFORM_LINUX

configure.ac

@@ -209,6 +209,7 @@ if test "x$ax_cv_boost_filesystem" != "xyes"; then
 fi
 
 ## Optional packages
+PKG_CHECK_MODULES([ZLIB], [zlib >= 1.2.0])
 
 ## Output
 

zlib.cpp

@@ -0,0 +1,52 @@
+#include "zlib.hpp"
+
+#include "debug.hpp"
+
+const char *
+util::zlib::version (void) {
+    return zlibVersion ();
+}
+
+
+size_t
+util::zlib::uncompress (uint8_t       *dst, size_t dst_len,
+                        const uint8_t *src, size_t src_len) {
+    size_t actual_len = dst_len;
+    int err = ::uncompress (dst, &actual_len, src, src_len);
+    error::try_code (err);
+    return actual_len;
+}
+
+
+void
+util::zlib::error::try_code (int code) {
+    if (Z_OK == code)
+        return;
+
+    throw_code(code);
+}
+
+
+util::zlib::error::error (const std::string &_what):
+    runtime_error (_what)
+{ ; }
+
+
+void
+util::zlib::error::throw_code (int code) {
+    CHECK_NEQ (code, Z_OK);
+
+    switch (code) {
+        #define do_code(c) case c: throw code_error<c> ();
+
+        do_code(Z_STREAM_ERROR);
+        do_code(Z_DATA_ERROR);
+        do_code(Z_MEM_ERROR);
+        do_code(Z_BUF_ERROR);
+        do_code(Z_VERSION_ERROR);
+    
+        default:
+            panic ("Unknown code");
+    }
+}
+

zlib.hpp

@@ -0,0 +1,72 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2013 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_ZLIB_HPP
+#define __UTIL_ZLIB_HPP
+
+#include <stdexcept>
+#include <string>
+
+#include <zlib.h>
+
+
+namespace util {
+    namespace zlib {
+        extern const char* version (void);
+
+        extern void compress (uint8_t       *dst, size_t dst_len,
+                              const uint8_t *src, size_t src_len,
+                              int level);
+
+        extern size_t compress_bound (size_t len);
+
+        extern size_t uncompress (uint8_t       *dst, size_t dst_len,
+                                  const uint8_t *src, size_t src_len);
+
+
+        class stream {
+            public:
+
+            public:
+                stream();
+                ~stream();
+
+                int deflate (bool flush = false);
+                int inflate (bool flush = false);
+        };
+
+
+        class error : public std::runtime_error {
+            public:
+                static void try_code   (int code);
+                static void throw_code (int code);
+
+                error(const std::string&);
+        };
+
+
+        template <int CODE>
+        class code_error : public error {
+            public:
+                code_error(void);
+        };
+    }
+}
+
+#endif