From 0ea9f3772ae6d398225bd17ce115a9452e888773 Mon Sep 17 00:00:00 2001
From: Björn Stenberg <bjorn@haxx.se>
Date: Sat, 27 Apr 2002 20:03:05 +0000
Subject: Added fat_seek()

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@271 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/fat.c | 28 ++++++++++++++++++++++++++++
 firmware/drivers/fat.h |  3 +++
 2 files changed, 31 insertions(+)

(limited to 'firmware/drivers')

diff --git a/firmware/drivers/fat.c b/firmware/drivers/fat.c
index fe5cef878d..3eab47e8b3 100644
--- a/firmware/drivers/fat.c
+++ b/firmware/drivers/fat.c
@@ -860,6 +860,34 @@ int fat_read(struct bpb *bpb,
     return sectorcount;
 }
 
+int fat_seek(struct bpb *bpb, 
+             struct fat_fileent *ent,
+             int seeksector )
+{
+    int cluster = ent->firstcluster;
+    int sector;
+    int numsec = 0;
+    int i;
+
+    for (i=0; i<seeksector; i++) {
+        numsec++;
+        if ( numsec >= bpb->bpb_secperclus ) {
+            cluster = get_next_cluster(bpb,cluster);
+            if (!cluster)
+                /* end of file */
+                return -1; 
+            
+            sector = cluster2sec(bpb,cluster);
+            if (sector<0)
+                return -2;
+            numsec=0;
+        }
+    }
+    ent->nextcluster = cluster;
+    ent->nextsector = sector;
+    ent->sectornum = numsec;
+    return 0;
+}
 
 int fat_opendir(struct bpb *bpb, 
                 struct fat_dirent *ent, 
diff --git a/firmware/drivers/fat.h b/firmware/drivers/fat.h
index a7c73c53fe..e259255d51 100644
--- a/firmware/drivers/fat.h
+++ b/firmware/drivers/fat.h
@@ -115,6 +115,9 @@ extern int fat_read(struct bpb *bpb,
                     struct fat_fileent *ent,
                     int sectorcount,
                     void* buf );
+extern int fat_seek(struct bpb *bpb, 
+                    struct fat_fileent *ent,
+                    int sector );
 
 extern int fat_opendir(struct bpb *bpb, 
                        struct fat_dirent *ent, 
-- 
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