From 4f9f95a05a41bfbcc9965eaaf7f2d14c6af9f261 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Sun, 12 Apr 2009 15:42:04 +0000
Subject: Write C++ libdimension-png wrapper.

---
 libdimensionxx/cookie.cpp | 163 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 libdimensionxx/cookie.cpp

(limited to 'libdimensionxx/cookie.cpp')

diff --git a/libdimensionxx/cookie.cpp b/libdimensionxx/cookie.cpp
new file mode 100644
index 0000000..dd8a06d
--- /dev/null
+++ b/libdimensionxx/cookie.cpp
@@ -0,0 +1,163 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library 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  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimensionxx.hpp"
+#include <stdio.h>
+
+namespace Dimension
+{
+  namespace
+  {
+    struct Cookie
+    {
+    public:
+      std::istream* istr;
+      std::ostream* ostr;
+    };
+
+    ssize_t
+    cookie_read(void* cookie, char* buf, size_t size)
+    {
+      Cookie* streams = reinterpret_cast<Cookie*>(cookie);
+
+      streams->istr->read(buf, size);
+
+      if (streams->istr->eof()) {
+        return streams->istr->gcount();
+      } else if (!streams->istr->good()) {
+        return -1;
+      } else {
+        return streams->istr->gcount();
+      }
+    }
+
+    ssize_t
+    cookie_write(void* cookie, const char* buf, size_t size)
+    {
+      Cookie* streams = reinterpret_cast<Cookie*>(cookie);
+
+      streams->ostr->write(buf, size);
+
+      if (!streams->ostr->good()) {
+        return -1;
+      } else {
+        return size;
+      }
+    }
+
+    int
+    cookie_seek(void* cookie, off64_t* offset, int whence)
+    {
+      Cookie* streams = reinterpret_cast<Cookie*>(cookie);
+      bool success = true;
+
+      if (streams->istr) {
+        switch (whence) {
+        case SEEK_SET:
+          streams->istr->seekg(*offset, std::ios::beg);
+          break;
+        case SEEK_CUR:
+          streams->istr->seekg(*offset, std::ios::cur);
+          break;
+        case SEEK_END:
+          streams->istr->seekg(*offset, std::ios::end);
+          break;
+        }
+
+        if (!streams->istr->good()) {
+          success = false;
+        }
+      }
+
+      if (streams->ostr) {
+        switch (whence) {
+        case SEEK_SET:
+          streams->ostr->seekp(*offset, std::ios::beg);
+          break;
+        case SEEK_CUR:
+          streams->ostr->seekp(*offset, std::ios::cur);
+          break;
+        case SEEK_END:
+          streams->ostr->seekp(*offset, std::ios::end);
+        }
+
+        if (!streams->ostr->good()) {
+          success = false;
+        }
+      }
+
+      return !success;
+    }
+
+    int
+    cookie_close(void* cookie)
+    {
+      delete reinterpret_cast<Cookie*>(cookie);
+    }
+  }
+
+  std::FILE*
+  fcookie(std::istream& istr)
+  {
+    Cookie* cookie = new Cookie;
+    cookie->istr = &istr;
+    cookie->ostr = 0;
+
+    cookie_io_functions_t io_funcs;
+    io_funcs.read  = &cookie_read;
+    io_funcs.write = 0;
+    io_funcs.seek  = &cookie_seek;
+    io_funcs.close = &cookie_close;
+
+    return fopencookie(reinterpret_cast<void*>(cookie), "r", io_funcs);
+  }
+
+  std::FILE*
+  fcookie(std::ostream& ostr)
+  {
+    Cookie* cookie = new Cookie;
+    cookie->istr = 0;
+    cookie->ostr = &ostr;
+
+    cookie_io_functions_t io_funcs;
+    io_funcs.read  = 0;
+    io_funcs.write = &cookie_write;
+    io_funcs.seek  = &cookie_seek;
+    io_funcs.close = &cookie_close;
+
+    return fopencookie(reinterpret_cast<void*>(cookie), "w", io_funcs);
+  }
+
+  std::FILE*
+  fcookie(std::iostream& iostr)
+  {
+    Cookie* cookie = new Cookie;
+    cookie->istr = &iostr;
+    cookie->ostr = &iostr;
+
+    cookie_io_functions_t io_funcs;
+    io_funcs.read  = &cookie_read;
+    io_funcs.write = &cookie_write;
+    io_funcs.seek  = &cookie_seek;
+    io_funcs.close = &cookie_close;
+
+    return fopencookie(reinterpret_cast<void*>(cookie), "r+", io_funcs);
+  }
+}
-- 
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