Added open/close/read. read() only works on whole sectors right now.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@498 a1c6a512-1295-4272-9138-f99709370657

6 files changed, 230 insertions, 51 deletions

diff --git a/firmware/common/dir.c b/firmware/common/dir.c
index b0927c09c6..acc412c570 100644
--- a/firmware/common/dir.c
+++ b/firmware/common/dir.c
@@ -94,6 +94,7 @@ struct dirent* readdir(DIR* dir)
     strncpy(theent.d_name, entry.name, sizeof( theent.d_name ) );
     theent.attribute = entry.attr;
     theent.size = entry.filesize;
+    theent.startcluster = entry.firstcluster;
 
     return &theent;
 }
diff --git a/firmware/common/dir.h b/firmware/common/dir.h
index e03d50901c..274c0b1ea4 100644
--- a/firmware/common/dir.h
+++ b/firmware/common/dir.h
@@ -32,6 +32,7 @@ struct dirent {
     unsigned char d_name[256];
     int attribute;
     int size;
+    int startcluster;
 };
 #endif
 
diff --git a/firmware/common/file.c b/firmware/common/file.c
new file mode 100644
index 0000000000..86e1099918
--- /dev/null
+++ b/firmware/common/file.c
@@ -0,0 +1,170 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Björn Stenberg
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <string.h>
+#include "file.h"
+#include "fat.h"
+#include "types.h"
+#include "dir.h"
+#include "debug.h"
+
+#define MAX_OPEN_FILES 4
+
+struct filedesc {
+    unsigned char sector[SECTOR_SIZE];
+    int offset;
+    struct fat_file fatfile;
+    bool busy;
+};
+
+static struct filedesc openfiles[MAX_OPEN_FILES];
+
+int open(char* pathname, int flags)
+{
+    DIR* dir;
+    struct dirent* entry;
+    int fd;
+    char* name;
+    int namelen;
+
+    if ( pathname[0] != '/' ) {
+        DEBUGF("'%s' is not an absolute path.\n",pathname);
+        DEBUGF("Only absolute pathnames supported at the moment\n");
+        return -1;
+    }
+
+    /* find a free file descriptor */
+    for ( fd=0; fd<MAX_OPEN_FILES; fd++ )
+        if ( !openfiles[fd].busy )
+            break;
+
+    if ( fd == MAX_OPEN_FILES ) {
+        DEBUGF("Too many files open\n");
+        return -1;
+    }
+
+    /* locate filename */
+    name=strrchr(pathname+1,'/');
+    if ( name ) {
+        *name = 0;
+        dir = opendir(pathname);
+        *name = '/';
+        name++;
+    }
+    else {
+        dir = opendir("/");
+        name = pathname+1;
+    }
+    if (!dir) {
+        DEBUGF("Failed opening dir\n");
+        return -1;
+    }
+
+    /* scan dir for name */
+    namelen = strlen(name);
+    while ((entry = readdir(dir))) {
+        if ( !strncmp(name, entry->d_name, namelen) ) {
+            fat_open(entry->startcluster, &(openfiles[fd].fatfile));
+            break;
+        }
+        else {
+            DEBUGF("entry: %s\n",entry->d_name);
+        }
+    }
+    closedir(dir);
+    if ( !entry ) {
+        DEBUGF("Couldn't find %s in %s\n",name,pathname);
+        /* fixme: we need to use proper error codes */
+        return -1;
+    }
+
+    openfiles[fd].offset = 0;
+    openfiles[fd].busy = TRUE;
+    return fd;
+}
+
+int close(int fd)
+{
+    openfiles[fd].busy = FALSE;
+    return 0;
+}
+
+int read(int fd, void* buf, int count)
+{
+    int sectors;
+    int nread=0;
+
+    /* are we in the middle of a cached sector? */
+    if ( openfiles[fd].offset ) {
+        if ( count > (SECTOR_SIZE - openfiles[fd].offset) ) {
+            memcpy( buf, openfiles[fd].sector,
+                    SECTOR_SIZE - openfiles[fd].offset );
+            openfiles[fd].offset = 0;
+            nread = SECTOR_SIZE - openfiles[fd].offset;
+            count -= nread;
+        }
+        else {
+            memcpy( buf, openfiles[fd].sector, count );
+            openfiles[fd].offset += count;
+            nread = count;
+            count = 0;
+        }
+    }
+
+    /* read whole sectors right into the supplied buffer */
+    sectors = count / SECTOR_SIZE;
+    if ( sectors ) {
+        if ( fat_read(&(openfiles[fd].fatfile), sectors, buf+nread ) < 0 ) {
+            DEBUGF("Failed reading %d sectors\n",sectors);
+            return -1;
+        }
+        nread += sectors * SECTOR_SIZE;
+        count -= sectors * SECTOR_SIZE;
+        openfiles[fd].offset = 0;
+    }
+
+    /* trailing odd bytes? */
+    if ( count ) {
+        /* do we already have the sector cached? */
+        if ( count < (SECTOR_SIZE - openfiles[fd].offset) ) {
+            memcpy( buf + nread, openfiles[fd].sector, count );
+            openfiles[fd].offset += count;
+            nread += count;
+            count = 0;
+        }
+        else {
+            /* cache one sector and copy the trailing bytes */
+            if ( fat_read(&(openfiles[fd].fatfile), 1,
+                          &(openfiles[fd].sector)) < 0 ) {
+                DEBUGF("Failed reading odd sector\n");
+                return -1;
+            }
+            memcpy( buf + nread, openfiles[fd].sector, count );
+            openfiles[fd].offset = nread;
+            nread += count;
+        }
+    }
+
+    return nread;
+}
+
+/*
+ * local variables:
+ * eval: (load-file "../rockbox-mode.el")
+ * end:
+ */
diff --git a/firmware/common/file.h b/firmware/common/file.h
index 58fb22d881..9d0d6f0501 100644
--- a/firmware/common/file.h
+++ b/firmware/common/file.h
@@ -33,14 +33,15 @@
 #ifndef SIMULATOR
 extern int open(char* pathname, int flags);
 extern int close(int fd);
-
 extern int read(int fd, void* buf, int count);
-extern int write(int fd, void* buf, int count);
-
 extern int lseek(int fd, int offset, int whence);
 
+#ifdef DISK_WRITE
+extern int write(int fd, void* buf, int count);
 extern int remove(char* pathname);
 extern int rename(char* oldname, char* newname);
+#endif
+
 #else
 #ifdef WIN32
 #include <io.h>
diff --git a/firmware/test/fat/Makefile b/firmware/test/fat/Makefile
index 48bddb9630..bd6869e8e9 100644
--- a/firmware/test/fat/Makefile
+++ b/firmware/test/fat/Makefile
@@ -5,7 +5,7 @@ CFLAGS = -g -Wall -DTEST_FAT -I$(DRIVERS) -I$(FIRMWARE)/common -I$(FIRMWARE) -I.
 
 TARGET = fat
 
-$(TARGET): fat.o ata-sim.o main.o disk.o debug.o dir.o
+$(TARGET): fat.o ata-sim.o main.o disk.o debug.o dir.o file.o
         gcc -g -o fat $+ -lfl
 
 fat.o: $(DRIVERS)/fat.c $(DRIVERS)/fat.h $(DRIVERS)/ata.h
@@ -17,6 +17,9 @@ disk.o: $(FIRMWARE)/common/disk.c
 dir.o: $(FIRMWARE)/common/dir.c
         $(CC) $(CFLAGS) -c $< -o $@
 
+file.o: $(FIRMWARE)/common/file.c
+        $(CC) $(CFLAGS) -c $< -o $@
+
 debug.o: $(FIRMWARE)/debug.c
         $(CC) $(CFLAGS) -c $< -o $@
 
diff --git a/firmware/test/fat/main.c b/firmware/test/fat/main.c
index 13c30b2ed5..0cf06bdac3 100644
--- a/firmware/test/fat/main.c
+++ b/firmware/test/fat/main.c
@@ -6,6 +6,7 @@
 #include "debug.h"
 #include "disk.h"
 #include "dir.h"
+#include "file.h"
 
 void dbg_dump_sector(int sec);
 void dbg_dump_buffer(unsigned char *buf);
@@ -17,7 +18,7 @@ void dbg_dump_sector(int sec)
     unsigned char buf[512];
 
     ata_read_sectors(sec,1,buf);
-    printf("---< Sector %d >-----------------------------------------\n", sec);
+    DEBUGF("---< Sector %d >-----------------------------------------\n", sec);
     dbg_dump_buffer(buf);
 }
 
@@ -33,7 +34,7 @@ void dbg_dump_buffer(unsigned char *buf)
         {
             c = buf[i*16+j];
 
-            printf("%02x ", c);
+            DEBUGF("%02x ", c);
             if(c < 32 || c > 127)
             {
                 ascii[j] = '.';
@@ -45,39 +46,39 @@ void dbg_dump_buffer(unsigned char *buf)
         }
 
         ascii[j] = 0;
-        printf("%s\n", ascii);
+        DEBUGF("%s\n", ascii);
     }
 }
 
 void dbg_print_bpb(struct bpb *bpb)
 {
-    printf("bpb_oemname = \"%s\"\n", bpb->bs_oemname);
-    printf("bpb_bytspersec = %d\n", bpb->bpb_bytspersec);
-    printf("bpb_secperclus = %d\n", bpb->bpb_secperclus);
-    printf("bpb_rsvdseccnt = %d\n", bpb->bpb_rsvdseccnt);
-    printf("bpb_numfats = %d\n", bpb->bpb_numfats);
-    printf("bpb_rootentcnt = %d\n", bpb->bpb_rootentcnt);
-    printf("bpb_totsec16 = %d\n", bpb->bpb_totsec16);
-    printf("bpb_media = %02x\n", bpb->bpb_media);
-    printf("bpb_fatsz16 = %d\n", bpb->bpb_fatsz16);
-    printf("bpb_secpertrk = %d\n", bpb->bpb_secpertrk);
-    printf("bpb_numheads = %d\n", bpb->bpb_numheads);
-    printf("bpb_hiddsec = %u\n", bpb->bpb_hiddsec);
-    printf("bpb_totsec32 = %u\n", bpb->bpb_totsec32);
-
-    printf("bs_drvnum = %d\n", bpb->bs_drvnum);
-    printf("bs_bootsig = %02x\n", bpb->bs_bootsig);
+    DEBUGF("bpb_oemname = \"%s\"\n", bpb->bs_oemname);
+    DEBUGF("bpb_bytspersec = %d\n", bpb->bpb_bytspersec);
+    DEBUGF("bpb_secperclus = %d\n", bpb->bpb_secperclus);
+    DEBUGF("bpb_rsvdseccnt = %d\n", bpb->bpb_rsvdseccnt);
+    DEBUGF("bpb_numfats = %d\n", bpb->bpb_numfats);
+    DEBUGF("bpb_rootentcnt = %d\n", bpb->bpb_rootentcnt);
+    DEBUGF("bpb_totsec16 = %d\n", bpb->bpb_totsec16);
+    DEBUGF("bpb_media = %02x\n", bpb->bpb_media);
+    DEBUGF("bpb_fatsz16 = %d\n", bpb->bpb_fatsz16);
+    DEBUGF("bpb_secpertrk = %d\n", bpb->bpb_secpertrk);
+    DEBUGF("bpb_numheads = %d\n", bpb->bpb_numheads);
+    DEBUGF("bpb_hiddsec = %u\n", bpb->bpb_hiddsec);
+    DEBUGF("bpb_totsec32 = %u\n", bpb->bpb_totsec32);
+
+    DEBUGF("bs_drvnum = %d\n", bpb->bs_drvnum);
+    DEBUGF("bs_bootsig = %02x\n", bpb->bs_bootsig);
     if(bpb->bs_bootsig == 0x29)
     {
-       printf("bs_volid = %xl\n", bpb->bs_volid);
-       printf("bs_vollab = \"%s\"\n", bpb->bs_vollab);
-       printf("bs_filsystype = \"%s\"\n", bpb->bs_filsystype);
+       DEBUGF("bs_volid = %xl\n", bpb->bs_volid);
+       DEBUGF("bs_vollab = \"%s\"\n", bpb->bs_vollab);
+       DEBUGF("bs_filsystype = \"%s\"\n", bpb->bs_filsystype);
     }
 
-    printf("bpb_fatsz32 = %u\n", bpb->bpb_fatsz32);
-    printf("last_word = %04x\n", bpb->last_word);
+    DEBUGF("bpb_fatsz32 = %u\n", bpb->bpb_fatsz32);
+    DEBUGF("last_word = %04x\n", bpb->last_word);
 
-    printf("fat_type = FAT32\n");
+    DEBUGF("fat_type = FAT32\n");
 }
 
 void dbg_dir(char* currdir)
@@ -88,38 +89,40 @@ void dbg_dir(char* currdir)
     dir = opendir(currdir);
     if (dir)
     {
-        for ( entry = readdir(dir); 
-              entry; 
-              entry = readdir(dir) )
-        {
-            printf("%s (%08x)\n", entry->d_name, entry->size);
+        while ( (entry = readdir(dir)) ) {
+            DEBUGF("%15s (%d bytes)\n", entry->d_name, entry->size);
         }
     }
     else
     {
-        fprintf(stderr, "Could not open dir %s\n", currdir);
+        DEBUGF( "Could not open dir %s\n", currdir);
     }
     closedir(dir);
 }
 
-void dbg_type(int cluster)
+void dbg_type(char* name)
 {
     unsigned char buf[SECTOR_SIZE*5];
-    struct fat_file ent;
-    int i;
+    int i,fd,rc;
 
-    fat_open(cluster,&ent);
+    fd = open(name,O_RDONLY);
+    if (fd<0)
+        return;
+    DEBUGF("Got file descriptor %d\n",fd);
     
-    for (i=0;i<5;i++)
-        if(fat_read(&ent, 1, buf) >= 0)
+    for (i=0;i<5;i++) {
+        rc = read(fd, buf, SECTOR_SIZE/3);
+        if( rc >= 0 )
         {
             buf[SECTOR_SIZE]=0;
-            printf("%s\n", buf);
+            DEBUGF("%d: %d\n", i, rc);
         }
         else
         {
-            fprintf(stderr, "Could not read file on cluster %d\n", cluster);
+            DEBUGF("Failed reading file\n");
         }
+    }
+    close(fd);
 }
 
 char current_directory[256] = "\\";
@@ -127,7 +130,7 @@ int last_secnum = 0;
 
 void dbg_prompt(void)
 {
-    printf("C:%s> ", current_directory);
+    DEBUGF("C:%s> ", current_directory);
 }
 
 void dbg_console(void)
@@ -173,19 +176,17 @@ void dbg_console(void)
                     {
                         last_secnum++;
                     }
-                    printf("secnum: %d\n", last_secnum);
+                    DEBUGF("secnum: %d\n", last_secnum);
                     dbg_dump_sector(last_secnum);
                     continue;
                 }
 
                 if(!strcasecmp(s, "type"))
                 {
-                    int cluster = 0;
-                    if((s = strtok(NULL, " \n")))
-                    {
-                        cluster = atoi(s);
-                    }
-                    dbg_type(cluster);
+                    s = strtok(NULL, " \n");
+                    if (!s)
+                        continue;
+                    dbg_type(s);
                     continue;
                 }
             
@@ -196,6 +197,8 @@ void dbg_console(void)
                 }
             }
         }
+        else
+            quit = 1;
     }
 }