Diff: USBMSD_Drop/RomDisk.cpp

Revision:

1:ea8e179320d7

Parent:

0:2385683c867a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBMSD_Drop/RomDisk.cpp	Sat Sep 28 03:21:14 2013 +0000
@@ -0,0 +1,55 @@
+// RomDisk.cpp 2013/9/26
+#include "mbed.h"
+#include "RomDisk.h"
+
+RomDisk::RomDisk()
+{
+    _sectors = 128; // 64KB(512*128)
+}
+
+int RomDisk::read(uint8_t * data, uint32_t block)
+{
+    SectorIndex* p = const_cast<SectorIndex*>(sector_index);
+    while(p->data) {
+        if (p->block == block) {
+            memcpy(data, p->data, 512);
+            return 0;
+        }
+        p++;    
+    }
+    memset(data, 0x00, 512);
+    return 0;   
+}
+
+int RomDisk::write(const uint8_t * data, uint32_t block)
+{
+    return 0;
+}
+
+uint32_t RomDisk::sectors()
+{
+    return _sectors;
+}
+
+bool RomDisk::is_fat(uint32_t sector)
+{
+    return sector >= 6 && sector <= 7;
+}
+
+bool RomDisk::is_rootdir(uint32_t sector)
+{
+    return sector >= 8 && sector <= 15;
+}
+
+int RomDisk::dir_count(uint32_t sector)
+{
+    if (!is_rootdir(sector)) {
+        return -1;
+    }
+    return sector - 8;
+}
+
+uint32_t RomDisk::cluster_to_sector(uint32_t cluster)
+{
+    return cluster + 38;
+}