forked from len0rd/rockbox
FS#11118: reduce the number of cached sector in FAT code because some are useless after a rewrite of LFN entries handling. Also makes LFN handling more robust.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25290 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly
parent
7a3822c8b0
commit
a8137252a5
2 changed files with 98 additions and 118 deletions
|
|
@ -31,6 +31,7 @@
|
|||
#include "timefuncs.h"
|
||||
#include "kernel.h"
|
||||
#include "rbunicode.h"
|
||||
/*#define LOGF_ENABLE*/
|
||||
#include "logf.h"
|
||||
|
||||
#define BYTES2INT16(array,pos) \
|
||||
|
|
@ -110,6 +111,14 @@
|
|||
#define FATLONG_ORDER 0
|
||||
#define FATLONG_TYPE 12
|
||||
#define FATLONG_CHKSUM 13
|
||||
#define FATLONG_LAST_LONG_ENTRY 0x40
|
||||
#define FATLONG_NAME_BYTES_PER_ENTRY 26
|
||||
/* at most 20 LFN entries, keep coherent with fat_dir->longname size ! */
|
||||
#define FATLONG_MAX_ORDER 20
|
||||
|
||||
#define FATLONG_NAME_CHUNKS 3
|
||||
static unsigned char FATLONG_NAME_POS[FATLONG_NAME_CHUNKS] = {1, 14, 28};
|
||||
static unsigned char FATLONG_NAME_SIZE[FATLONG_NAME_CHUNKS] = {10, 12, 4};
|
||||
|
||||
#define CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4)
|
||||
#define CLUSTERS_PER_FAT16_SECTOR (SECTOR_SIZE / 2)
|
||||
|
|
@ -1173,7 +1182,7 @@ static int write_long_name(struct fat_file* file,
|
|||
entry[FATLONG_ORDER] = numentries-i-1;
|
||||
if (i==0) {
|
||||
/* mark this as last long entry */
|
||||
entry[FATLONG_ORDER] |= 0x40;
|
||||
entry[FATLONG_ORDER] |= FATLONG_LAST_LONG_ENTRY;
|
||||
|
||||
/* pad name with 0xffff */
|
||||
for (k=1; k<11; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;
|
||||
|
|
@ -2323,47 +2332,20 @@ 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 i, j;
|
||||
int rc;
|
||||
int order;
|
||||
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;
|
||||
unsigned char* cached_buf = dir->sectorcache[0];
|
||||
up to 13 characters. Names can be max 255 chars (not bytes!) long */
|
||||
/* The number of long entries in the long name can be retrieve from the first
|
||||
* long entry because there are stored in reverse order and have an ordinal */
|
||||
int nb_longs = 0;
|
||||
/* The long entries are expected to be in order, so remember the last ordinal */
|
||||
int last_long_ord = 0;
|
||||
|
||||
dir->entrycount = 0;
|
||||
|
||||
|
|
@ -2371,7 +2353,7 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|||
{
|
||||
if ( !(dir->entry % DIR_ENTRIES_PER_SECTOR) || !dir->sector )
|
||||
{
|
||||
rc = fat_readwrite(&dir->file, 1, cached_buf, false);
|
||||
rc = fat_readwrite(&dir->file, 1, dir->sectorcache, false);
|
||||
if (rc == 0) {
|
||||
/* eof */
|
||||
entry->name[0] = 0;
|
||||
|
|
@ -2386,16 +2368,14 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|||
}
|
||||
|
||||
for (i = dir->entry % DIR_ENTRIES_PER_SECTOR;
|
||||
i < DIR_ENTRIES_PER_SECTOR; i++)
|
||||
{
|
||||
i < DIR_ENTRIES_PER_SECTOR; i++) {
|
||||
unsigned int entrypos = i * DIR_ENTRY_SIZE;
|
||||
|
||||
firstbyte = cached_buf[entrypos];
|
||||
firstbyte = dir->sectorcache[entrypos];
|
||||
dir->entry++;
|
||||
|
||||
if (firstbyte == 0xe5) {
|
||||
/* free entry */
|
||||
sectoridx = 0;
|
||||
dir->entrycount = 0;
|
||||
continue;
|
||||
}
|
||||
|
|
@ -2409,14 +2389,48 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|||
|
||||
dir->entrycount++;
|
||||
|
||||
/* longname entry? */
|
||||
if ( ( cached_buf[entrypos + FATDIR_ATTR] &
|
||||
/* LFN entry? */
|
||||
if ( ( dir->sectorcache[entrypos + FATDIR_ATTR] &
|
||||
FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) {
|
||||
longarray[longs++] = entrypos + sectoridx;
|
||||
/* extract ordinal */
|
||||
order = dir->sectorcache[entrypos + FATLONG_ORDER] & ~FATLONG_LAST_LONG_ENTRY;
|
||||
/* is this entry the first long entry ? (first in order but containing last part) */
|
||||
if (dir->sectorcache[entrypos + FATLONG_ORDER] & FATLONG_LAST_LONG_ENTRY) {
|
||||
/* check that order is not too big ! (and non-zero) */
|
||||
if(order <= 0 || order > FATLONG_MAX_ORDER)
|
||||
continue; /* ignore the whole LFN, will trigger lots of warnings */
|
||||
nb_longs = order;
|
||||
last_long_ord = order;
|
||||
}
|
||||
else {
|
||||
/* check orphan entry */
|
||||
if (nb_longs == 0) {
|
||||
logf("fat warning: orphan LFN entry");
|
||||
/* ignore */
|
||||
continue;
|
||||
}
|
||||
|
||||
/* check order */
|
||||
if (order != (last_long_ord - 1)) {
|
||||
logf("fat warning: wrong LFN ordinal");
|
||||
/* ignore the whole LFN, will trigger lots of warnings */
|
||||
nb_longs = 0;
|
||||
}
|
||||
|
||||
last_long_ord = order;
|
||||
}
|
||||
|
||||
/* copy part, reuse [order] for another purpose :) */
|
||||
order = (order - 1) * FATLONG_NAME_BYTES_PER_ENTRY;
|
||||
for(j = 0; j < FATLONG_NAME_CHUNKS; j++) {
|
||||
memcpy(dir->longname + order,
|
||||
dir->sectorcache + entrypos + FATLONG_NAME_POS[j],
|
||||
FATLONG_NAME_SIZE[j]);
|
||||
order += FATLONG_NAME_SIZE[j];
|
||||
}
|
||||
}
|
||||
else {
|
||||
if ( parse_direntry(entry,
|
||||
&cached_buf[entrypos]) ) {
|
||||
if ( parse_direntry(entry, dir->sectorcache + entrypos) ) {
|
||||
|
||||
/* don't return volume id entry */
|
||||
if ( (entry->attr &
|
||||
|
|
@ -2425,74 +2439,45 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|||
continue;
|
||||
|
||||
/* replace shortname with longname? */
|
||||
if ( longs ) {
|
||||
int j;
|
||||
/* This should be enough to hold any name segment
|
||||
utf8-encoded */
|
||||
/* check that the long name is complete */
|
||||
if (nb_longs != 0 && last_long_ord == 1) {
|
||||
/* hold a copy of the shortname in case the long one is too long */
|
||||
unsigned char shortname[13]; /* 8+3+dot+\0 */
|
||||
/* Add 1 for trailing \0 */
|
||||
unsigned char longname_utf8segm[6*4 + 1];
|
||||
int longname_utf8len = 0;
|
||||
/* Temporarily store it */
|
||||
/* One character at a time, add 1 for trailing \0, 4 is the maximum size
|
||||
* of a UTF8 encoded character in rockbox */
|
||||
unsigned char longname_utf8segm[4 + 1];
|
||||
unsigned short ucs;
|
||||
int segm_utf8len;
|
||||
/* Temporarily store short name */
|
||||
strcpy(shortname, entry->name);
|
||||
entry->name[0] = 0;
|
||||
|
||||
/* iterate backwards through the dir entries */
|
||||
for (j=longs-1; j>=0; j--) {
|
||||
unsigned char* ptr = cached_buf;
|
||||
int index = longarray[j];
|
||||
/* current or cached sector? */
|
||||
if ( sectoridx >= SECTOR_SIZE ) {
|
||||
if ( sectoridx >= SECTOR_SIZE*2 ) {
|
||||
if ( ( index >= SECTOR_SIZE ) &&
|
||||
( index < SECTOR_SIZE*2 ))
|
||||
ptr = dir->sectorcache[1];
|
||||
else
|
||||
ptr = dir->sectorcache[2];
|
||||
}
|
||||
else {
|
||||
if ( index < SECTOR_SIZE )
|
||||
ptr = dir->sectorcache[1];
|
||||
}
|
||||
/* Convert the FAT name to a utf8-encoded one.
|
||||
* The name is not necessary NUL-terminated ! */
|
||||
for (j = 0; j < nb_longs * FATLONG_NAME_BYTES_PER_ENTRY; j += 2) {
|
||||
ucs = dir->longname[j] | (dir->longname[j + 1] << 8);
|
||||
if(ucs == 0 || ucs == FAT_LONGNAME_PAD_UCS)
|
||||
break;
|
||||
/* utf8encode will return a pointer after the converted
|
||||
* string, subtract the pointer to the start to get the length of it */
|
||||
segm_utf8len = utf8encode(ucs, longname_utf8segm) - longname_utf8segm;
|
||||
|
||||
index &= SECTOR_SIZE-1;
|
||||
/* warn the trailing zero ! (FAT_FILENAME_BYTES includes it) */
|
||||
if (longname_utf8len + segm_utf8len >= FAT_FILENAME_BYTES) {
|
||||
/* force use of short name */
|
||||
longname_utf8len = FAT_FILENAME_BYTES + 1;
|
||||
break; /* fallback later */
|
||||
}
|
||||
else {
|
||||
longname_utf8segm[segm_utf8len] = 0;
|
||||
strcat(entry->name + longname_utf8len, longname_utf8segm);
|
||||
longname_utf8len += segm_utf8len;
|
||||
}
|
||||
|
||||
/* 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? */
|
||||
/* warn the trailing zero ! (FAT_FILENAME_BYTES includes it) */
|
||||
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
|
||||
|
|
@ -2504,29 +2489,19 @@ int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|||
unsigned char *utf8;
|
||||
utf8 = iso_decode(shortname, entry->name, -1,
|
||||
strlen(shortname));
|
||||
*utf8 = 0;
|
||||
*utf8 = 0;
|
||||
logf("SN: %s", entry->name);
|
||||
} else {
|
||||
/* logf("LN: %s", entry->name);
|
||||
logf("LNLen: %d (%c)", longname_utf8len,
|
||||
entry->name[0]); */
|
||||
logf("LN: %s", entry->name);
|
||||
logf("LNLen: %d", longname_utf8len);
|
||||
}
|
||||
}
|
||||
done = true;
|
||||
sectoridx = 0;
|
||||
i++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* save this sector, for longname use */
|
||||
if ( sectoridx )
|
||||
memcpy( dir->sectorcache[2], dir->sectorcache[0], SECTOR_SIZE );
|
||||
else
|
||||
memcpy( dir->sectorcache[1], dir->sectorcache[0], SECTOR_SIZE );
|
||||
sectoridx += SECTOR_SIZE;
|
||||
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue