summaryrefslogtreecommitdiffstats
path: root/firmware/drivers/fat.c
diff options
context:
space:
mode:
Diffstat (limited to 'firmware/drivers/fat.c')
-rw-r--r--firmware/drivers/fat.c106
1 files changed, 93 insertions, 13 deletions
diff --git a/firmware/drivers/fat.c b/firmware/drivers/fat.c
index 854b815237..70a896442c 100644
--- a/firmware/drivers/fat.c
+++ b/firmware/drivers/fat.c
@@ -29,12 +29,13 @@
#include "timefuncs.h"
#include "kernel.h"
#include "rbunicode.h"
+#include "logf.h"
#define BYTES2INT16(array,pos) \
(array[pos] | (array[pos+1] << 8 ))
-#define BYTES2INT32(array,pos) \
- ((long)array[pos] | ((long)array[pos+1] << 8 ) | \
- ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
+#define BYTES2INT32(array,pos) \
+ ((long)array[pos] | ((long)array[pos+1] << 8 ) | \
+ ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
#define FATTYPE_FAT12 0
#define FATTYPE_FAT16 1
@@ -115,6 +116,8 @@
#define NAME_BYTES_PER_ENTRY 13
#define FAT_BAD_MARK 0x0ffffff7
#define FAT_EOF_MARK 0x0ffffff8
+#define FAT_LONGNAME_PAD_BYTE 0xff
+#define FAT_LONGNAME_PAD_UCS 0xffff
struct fsinfo {
unsigned long freecount; /* last known free cluster count */
@@ -720,9 +723,7 @@ static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,) unsigned lon
return 0; /* 0 is an illegal cluster number */
}
-static int update_fat_entry(IF_MV2(struct bpb* fat_bpb,)
- unsigned long entry,
- unsigned long val)
+static int update_fat_entry(IF_MV2(struct bpb* fat_bpb,) unsigned long entry, unsigned long val)
{
#ifndef HAVE_MULTIVOLUME
struct bpb* fat_bpb = &fat_bpbs[0];
@@ -1117,9 +1118,9 @@ static int write_long_name(struct fat_file* file,
entry[FATLONG_ORDER] |= 0x40;
/* pad name with 0xffff */
- for (k=1; k<11; k++) entry[k] = 0xff;
- for (k=14; k<26; k++) entry[k] = 0xff;
- for (k=28; k<32; k++) entry[k] = 0xff;
+ for (k=1; k<11; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;
+ for (k=14; k<26; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;
+ for (k=28; k<32; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;
};
/* set name */
for (k=0; k<5 && l <= namelen; k++) {
@@ -2165,12 +2166,43 @@ int fat_opendir(IF_MV2(int volume,)
return 0;
}
+/* Copies a segment of long file name (UTF-16 LE encoded) to the
+ * destination buffer (UTF-8 encoded). Copying is stopped when
+ * either 0x0000 or 0xffff (FAT pad char) is encountered.
+ * Trailing \0 is also appended at the end of the UTF8-encoded
+ * string.
+ *
+ * utf16src utf16 (little endian) segment to copy
+ * utf16count max number of the utf16-characters to copy
+ * utf8dst where to write UTF8-encoded string to
+ *
+ * returns the number of UTF-16 characters actually copied
+ */
+static int fat_copy_long_name_segment(unsigned char *utf16src,
+ int utf16count, unsigned char *utf8dst) {
+ int cnt = 0;
+ while ((utf16count--) > 0) {
+ unsigned short ucs = utf16src[0] | (utf16src[1] << 8);
+ if ((ucs == 0) || (ucs == FAT_LONGNAME_PAD_UCS)) {
+ break;
+ }
+ utf8dst = utf8encode(ucs, utf8dst);
+ utf16src += 2;
+ cnt++;
+ }
+ *utf8dst = 0;
+ return cnt;
+}
+
int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
{
bool done = false;
int i;
int rc;
unsigned char firstbyte;
+ /* Long file names are stored in special entries. Each entry holds
+ up to 13 characters. Names can be max 255 chars (not bytes!) long
+ hence max 20 entries are required. */
int longarray[20];
int longs=0;
int sectoridx=0;
@@ -2238,7 +2270,14 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
/* replace shortname with longname? */
if ( longs ) {
int j;
- unsigned char* utf8 = entry->name;
+ /* This should be enough to hold any name segment utf8-encoded */
+ unsigned char shortname[13]; /* 8+3+dot+\0 */
+ unsigned char longname_utf8segm[6*4 + 1]; /* Add 1 for trailing \0 */
+ int longname_utf8len = 0;
+
+ strcpy(shortname, entry->name); /* Temporarily store it */
+ entry->name[0] = 0;
+
/* iterate backwards through the dir entries */
for (j=longs-1; j>=0; j--) {
unsigned char* ptr = cached_buf;
@@ -2260,11 +2299,52 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
index &= SECTOR_SIZE-1;
}
- utf8 = utf16LEdecode(ptr + index + 1, utf8, 5);
- utf8 = utf16LEdecode(ptr + index + 14, utf8, 6);
- utf8 = utf16LEdecode(ptr + index + 28, utf8, 2);
+ /* Try to append each segment of the long name. Check if we'd
+ exceed the buffer. Also check for FAT padding characters 0xFFFF. */
+ if (fat_copy_long_name_segment(ptr + index + 1, 5,
+ longname_utf8segm) == 0) break;
+ logf("SG: %s, EN: %s", longname_utf8segm, entry->name);
+ longname_utf8len += strlen(longname_utf8segm);
+ if (longname_utf8len < FAT_FILENAME_BYTES)
+ strcat(entry->name, longname_utf8segm);
+ else
+ break;
+
+ if (fat_copy_long_name_segment(ptr + index + 14, 6,
+ longname_utf8segm) == 0) break;
+ logf("SG: %s, EN: %s", longname_utf8segm, entry->name);
+ longname_utf8len += strlen(longname_utf8segm);
+ if (longname_utf8len < FAT_FILENAME_BYTES)
+ strcat(entry->name, longname_utf8segm);
+ else
+ break;
+
+ if (fat_copy_long_name_segment(ptr + index + 28, 2,
+ longname_utf8segm) == 0) break;
+ logf("SG: %s, EN: %s", longname_utf8segm, entry->name);
+ longname_utf8len += strlen(longname_utf8segm);
+ if (longname_utf8len < FAT_FILENAME_BYTES)
+ strcat(entry->name, longname_utf8segm);
+ else
+ break;
}
+
+ /* Does the utf8-encoded name fit into the entry? */
+ if (longname_utf8len >= FAT_FILENAME_BYTES) {
+ /* Take the short DOS name. Need to utf8-encode it since
+ it may contain chars from the upper half of the OEM
+ code page which wouldn't be a valid utf8. Beware: this
+ file will be shown with strange glyphs in file browser
+ since unicode 0x80 to 0x9F are control characters. */
+ logf("SN-DOS: %s", shortname);
+ unsigned char *utf8;
+ utf8 = iso_decode(shortname, entry->name, -1, strlen(shortname));
*utf8 = 0;
+ logf("SN: %s", entry->name);
+ } else {
+ logf("LN: %s", entry->name);
+ logf("LNLen: %d (%c)", longname_utf8len, entry->name[0]);
+ }
}
done = true;
sectoridx = 0;