lots of Wii disc parsing in place

lib/DiscIOISO.cpp

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdexcept>
+#include "IDiscIO.hpp"
+
+namespace NOD
+{
+
+class DiscIOISO : public IDiscIO
+{
+    std::string filepath;
+public:
+    DiscIOISO(const std::string& fpin)
+    : filepath(fpin) {}
+
+    class ReadStream : public IReadStream
+    {
+        friend class DiscIOISO;
+        FILE* fp;
+        ReadStream(FILE* fpin)
+        : fp(fpin) {}
+        ~ReadStream() {fclose(fp);}
+    public:
+        size_t read(void* buf, size_t length)
+        {return fread(buf, 1, length, fp);}
+        void seek(size_t offset, int whence)
+        {fseek(fp, offset, whence);}
+    };
+    std::unique_ptr<IReadStream> beginReadStream(size_t offset) const
+    {
+        FILE* fp = fopen(filepath.c_str(), "rb");
+        if (!fp)
+        {
+            throw std::runtime_error("Unable to open '" + filepath + "' for reading");
+            return std::unique_ptr<IReadStream>();
+        }
+        fseek(fp, offset, SEEK_SET);
+        return std::unique_ptr<IReadStream>(new ReadStream(fp));
+    }
+
+    class WriteStream : public IWriteStream
+    {
+        friend class DiscIOISO;
+        FILE* fp;
+        WriteStream(FILE* fpin)
+        : fp(fpin) {}
+        ~WriteStream() {fclose(fp);}
+    public:
+        size_t write(void* buf, size_t length)
+        {return fwrite(buf, 1, length, fp);}
+    };
+    std::unique_ptr<IWriteStream> beginWriteStream(size_t offset) const
+    {
+        FILE* fp = fopen(filepath.c_str(), "wb");
+        if (!fp)
+        {
+            throw std::runtime_error("Unable to open '" + filepath + "' for writing");
+            return std::unique_ptr<IWriteStream>();
+        }
+        fseek(fp, offset, SEEK_SET);
+        return std::unique_ptr<IWriteStream>(new WriteStream(fp));
+    }
+};
+
+std::unique_ptr<IDiscIO> NewDiscIOISO(const char* path)
+{
+    return std::unique_ptr<IDiscIO>(new DiscIOISO(path));
+}
+
+}
+