LCD Driver, some teensy code, SDCard code, MBR/FAT32

ext/sd/fat32/File.h

@@ -0,0 +1,64 @@
+class File {
+
+	static constexpr const int32_t F_EOF = -1;
+
+	FS& fs;
+	uint32_t totalSize;
+
+	uint32_t curAbsPos = 0;		// position withithin the whole file
+	uint32_t curCluster = 0;	// cluster we are currently reading
+	uint32_t posInCluster = 0;	// position within the current cluster
+
+
+public:
+
+	File(FS& fs, uint32_t firstCluster, uint32_t size) : fs(fs), totalSize(size), curCluster(firstCluster) {
+
+	}
+
+	/** the file's size */
+	uint32_t getSize() const {return totalSize;}
+
+	uint32_t read(uint32_t size, uint8_t* dst) {
+		uint32_t total = 0;
+		while(true) {
+			const uint32_t read = _read(size, dst);
+			if (read == F_EOF) {break;}
+			size -= read;
+			dst += read;
+			total += read;
+		}
+		return total;
+	}
+
+private:
+
+	int32_t _read(uint32_t readSize, uint8_t* dst) {
+
+		// EOF reached?
+		if (curAbsPos >= totalSize) {
+			return F_EOF;
+		}
+
+		// end of current cluster reached? -> determine the next one
+		if (posInCluster == fs.tmp.bytesPerCluster) {
+			curCluster = fs.getNextCluster(curCluster);
+			posInCluster = 0;
+		}
+
+		// how many bytes are left in the current cluster?
+		const uint32_t remainingInCluster = fs.tmp.bytesPerCluster - posInCluster;
+
+		// determine how many bytes to read
+		const uint32_t toRead = std::min(remainingInCluster, readSize);
+
+		const uint32_t offset = fs.clusterToAbsPos(curCluster) + posInCluster;
+		const uint32_t read = fs.dev.read(offset, toRead, dst);
+		posInCluster += read;
+		curAbsPos += read;
+
+		return read;
+
+	}
+
+};