Applying adafruit SD updates (available() overful fix).

http://code.google.com/p/arduino/issues/detail?id=595

Author: damellis

libraries/SD/File.cpp

@@ -101,7 +101,10 @@ int File::read(void *buf, uint16_t nbyte) {
 
 int File::available() {
   if (! _file) return 0;
-  return size() - position();
+
+  uint32_t n = size() - position();
+
+  return n > 0X7FFF ? 0X7FFF : n;
 }
 
 void File::flush() {

libraries/SD/examples/CardInfo/CardInfo.ino

@@ -80,7 +80,7 @@ void setup()
 
 
   // print the type and size of the first FAT-type volume
-  long volumesize;
+  uint32_t volumesize;
   Serial.print("\nVolume type is FAT");
   Serial.println(volume.fatType(), DEC);
   Serial.println();