o add my bsnes branch

tools/bsnes/reader/filereader.cpp

@@ -0,0 +1,50 @@
+#ifdef READER_CPP
+
+#include "filereader.hpp"
+
+unsigned FileReader::size() {
+  return fp.size();
+}
+
+//This function will allocate memory even if open() fails.
+//This is needed so that when SRAM files do not exist, the
+//memory for the SRAM data will be allocated still.
+//The memory is flushed to 0x00 when no file is opened.
+uint8_t* FileReader::read(unsigned length) {
+  uint8_t *data = 0;
+
+  if(length == 0) {
+    //read the entire file into RAM
+    data = new(zeromemory) uint8_t[fp.size()];
+    if(fp.open()) fp.read(data, fp.size());
+  } else if(length > fp.size()) {
+    //read the entire file into RAM, pad the rest with 0x00s
+    data = new(zeromemory) uint8_t[length];
+    if(fp.open()) fp.read(data, fp.size());
+  } else { //filesize >= length
+    //read only what was requested
+    data = new(zeromemory) uint8_t[length];
+    if(fp.open()) fp.read(data, length);
+  }
+
+  return data;
+}
+
+bool FileReader::ready() {
+  return fp.open();
+}
+
+FileReader::FileReader(const char *fn) {
+  if(!fp.open(fn, file::mode_read)) return;
+
+  if(fp.size() == 0) {
+    //empty file
+    fp.close();
+  }
+}
+
+FileReader::~FileReader() {
+  if(fp.open()) fp.close();
+}
+
+#endif //ifdef READER_CPP