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dosfs: Fix msdos_dir_read()

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Set a proper name buffer length for each converter invocation.

Close #2987.
This commit is contained in:
Sebastian Huber
2017-09-06 13:19:05 +02:00
parent 2ed53cb982
commit e1c3dc0909
1 changed files with 27 additions and 26 deletions
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53
cpukit/libfs/src/dosfs/msdos_dir.c
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@@ -72,7 +72,7 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
fat_file_fd_t *fat_fd = iop->pathinfo.node_access;
fat_file_fd_t *tmp_fat_fd = NULL;
struct dirent tmp_dirent;
size_t tmp_lfn_len = 0;
size_t lfn_len = 0;
uint16_t *lfn_buf = converter->buffer.data;
char *sfn_buf = converter->buffer.data;
const size_t buf_size = converter->buffer.size;
@@ -85,7 +85,6 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
uint32_t lfn_start = FAT_FILE_SHORT_NAME;
uint8_t lfn_checksum = 0;
int lfn_entries = 0;
size_t string_size = sizeof(tmp_dirent.d_name);
bool is_first_entry;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
@@ -185,7 +184,7 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
*/
lfn_entries = (*MSDOS_DIR_ENTRY_TYPE(entry) &
MSDOS_LAST_LONG_ENTRY_MASK);
tmp_lfn_len = 0;
lfn_len = 0;
lfn_checksum = *MSDOS_DIR_LFN_CHECKSUM(entry);
memset (tmp_dirent.d_name, 0, sizeof(tmp_dirent.d_name));
}
@@ -220,7 +219,7 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
lfn_entries--;
offset_lfn = lfn_entries * MSDOS_LFN_LEN_PER_ENTRY;
tmp_lfn_len += msdos_get_utf16_string_from_long_entry (
lfn_len += msdos_get_utf16_string_from_long_entry (
entry,
&lfn_buf[offset_lfn],
buf_size - offset_lfn,
@@ -281,27 +280,30 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
*/
if (lfn_start != FAT_FILE_SHORT_NAME)
{
if (lfn_entries ||
lfn_checksum != msdos_lfn_checksum(entry))
lfn_start = FAT_FILE_SHORT_NAME;
if (lfn_entries == 0 &&
lfn_checksum == msdos_lfn_checksum(entry)) {
size_t len = sizeof(tmp_dirent.d_name) - 1;
eno = (*convert_handler->utf16_to_utf8) (
converter,
lfn_buf,
tmp_lfn_len,
(uint8_t*)(&tmp_dirent.d_name[0]),
&string_size);
if (eno == 0) {
tmp_dirent.d_namlen = string_size;
tmp_dirent.d_name[tmp_dirent.d_namlen] = '\0';
}
else {
eno = (*convert_handler->utf16_to_utf8) (
converter,
lfn_buf,
lfn_len,
(uint8_t *) &tmp_dirent.d_name[0],
&len);
if (eno == 0) {
tmp_dirent.d_namlen = len;
tmp_dirent.d_name[len] = '\0';
} else {
lfn_start = FAT_FILE_SHORT_NAME;
}
} else {
lfn_start = FAT_FILE_SHORT_NAME;
}
}
if (lfn_start == FAT_FILE_SHORT_NAME)
{
if (lfn_start == FAT_FILE_SHORT_NAME) {
size_t len = sizeof(tmp_dirent.d_name) - 1;
/*
* convert dir entry from fixed 8+3 format (without dot)
* to 0..8 + 1dot + 0..3 format
@@ -312,13 +314,12 @@ msdos_dir_read(rtems_libio_t *iop, void *buffer, size_t count)
converter,
sfn_buf,
tmp_dirent.d_namlen,
(uint8_t*)(&tmp_dirent.d_name[0]),
&string_size);
(uint8_t *) &tmp_dirent.d_name[0],
&len);
if ( 0 == eno ) {
tmp_dirent.d_namlen = string_size;
tmp_dirent.d_name[tmp_dirent.d_namlen] = '\0';
}
else {
tmp_dirent.d_namlen = len;
tmp_dirent.d_name[len] = '\0';
} else {
cmpltd = -1;
errno = eno;
}