Fix reading long files.

src/fs.rs

@@ -143,7 +143,8 @@ impl FatFileSystem {
             println!("fat_type_label {}", fat_type_label_str);
         }
         
-        // FIXME: other versions
+        let fat_offset = boot.bpb.reserved_sector_count * boot.bpb.bytes_per_sector;
+        rdr.seek(SeekFrom::Start(fat_offset as u64))?;
         let table_size_bytes = table_size * boot.bpb.bytes_per_sector as u32;
         let table: Box<FatTable> = match fat_type {
             FatType::Fat12 => Box::new(FatTable12::read(&mut rdr, table_size_bytes as usize)?),

src/table.rs

@@ -53,7 +53,7 @@ pub trait FatTable {
 impl FatTable for FatTable32 {
     fn get_next_cluster(&self, cluster: u32) -> Option<u32> {
         let val = self.table[cluster as usize] & 0x0FFFFFFF;
-        if val >= 0x0FFFFFF7 {
+        if val <= 1 || val >= 0x0FFFFFF7 {
             None
         } else {
             Some(val)
@@ -64,7 +64,7 @@ impl FatTable for FatTable32 {
 impl FatTable for FatTable16 {
     fn get_next_cluster(&self, cluster: u32) -> Option<u32> {
         let val = self.table[cluster as usize];
-        if val >= 0xFFF7 {
+        if val <= 1 || val >= 0xFFF7 {
             None
         } else {
             Some(val as u32)
@@ -83,7 +83,7 @@ impl FatTable for FatTable12 {
         } else {
             val1 | (val2 & 0x0F)
         };
-        if val >= 0xFF7 {
+        if val <= 1 || val >= 0xFF7 {
             None
         } else {
             Some(val as u32)

tests/integration-test.rs

@@ -2,10 +2,13 @@ extern crate rustfat;
 
 use std::fs::File;
 use std::io::BufReader;
+use std::io::prelude::*;
 use std::str;
 
 use rustfat::FatFileSystem;
 
+const TEST_TEXT: &'static str = "Rust is cool!\n";
+
 fn test_img(name: &str) {
     let file = File::open(name).unwrap();
     let buf_rdr = BufReader::new(file);
@@ -16,6 +19,21 @@ fn test_img(name: &str) {
     assert_eq!(entries[0].get_name(), "LONG.TXT");
     assert_eq!(entries[1].get_name(), "SHORT.TXT");
     assert_eq!(entries[2].get_name(), "VERY");
+    
+    {
+        let mut short_file = entries[1].get_file();
+        let mut buf = Vec::new();
+        short_file.read_to_end(&mut buf).unwrap();
+        assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT);
+    }
+    
+    {
+        let mut long_file = entries[0].get_file();
+        let mut buf = Vec::new();
+        long_file.read_to_end(&mut buf).unwrap();
+        assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT.repeat(1000));
+    }
+    
 }
 
 #[test]