int fsw_streq(struct fsw_string *s1, struct fsw_string *s2)
{
struct fsw_string temp_s;
// handle empty strings
if (s1->type == FSW_STRING_TYPE_EMPTY) {
temp_s.type = FSW_STRING_TYPE_ISO88591;
temp_s.size = temp_s.len = 0;
temp_s.data = NULL;
return fsw_streq(&temp_s, s2);
}
if (s2->type == FSW_STRING_TYPE_EMPTY) {
temp_s.type = FSW_STRING_TYPE_ISO88591;
temp_s.size = temp_s.len = 0;
temp_s.data = NULL;
return fsw_streq(s1, &temp_s);
}
// check length (count of chars)
if (s1->len != s2->len)
return 0;
if (s1->len == 0) // both strings are empty
return 1;
if (s1->type == s2->type) {
// same type, do a dumb memory compare
if (s1->size != s2->size)
return 0;
return fsw_memeq(s1->data, s2->data, s1->size);
}
// dispatch to type-specific functions
#define STREQ_DISPATCH(type1, type2) \
if (s1->type == FSW_STRING_TYPE_##type1 && s2->type == FSW_STRING_TYPE_##type2) \
return fsw_streq_##type1##_##type2(s1->data, s2->data, s1->len); \
if (s2->type == FSW_STRING_TYPE_##type1 && s1->type == FSW_STRING_TYPE_##type2) \
return fsw_streq_##type1##_##type2(s2->data, s1->data, s1->len);
STREQ_DISPATCH(ISO88591, UTF8);
STREQ_DISPATCH(ISO88591, UTF16);
STREQ_DISPATCH(ISO88591, UTF16_SWAPPED);
STREQ_DISPATCH(UTF8, UTF16);
STREQ_DISPATCH(UTF8, UTF16_SWAPPED);
STREQ_DISPATCH(UTF16, UTF16_SWAPPED);
// final fallback
return 0;
}
int fsw_streq_cstr(struct fsw_string *s1, const char *s2)
{
struct fsw_string temp_s;
int i;
for (i = 0; s2[i]; i++)
;
temp_s.type = FSW_STRING_TYPE_ISO88591;
temp_s.size = temp_s.len = i;
temp_s.data = (char *)s2;
return fsw_streq(s1, &temp_s);
}
static fsw_status_t fsw_ext2_dir_lookup(struct fsw_ext2_volume *vol, struct fsw_ext2_dnode *dno,
struct fsw_string *lookup_name, struct fsw_ext2_dnode **child_dno_out)
{
fsw_status_t status;
struct fsw_shandle shand;
fsw_u32 child_ino;
struct ext2_dir_entry entry;
struct fsw_string entry_name;
// Preconditions: The caller has checked that dno is a directory node.
entry_name.type = FSW_STRING_TYPE_ISO88591;
// setup handle to read the directory
status = fsw_shandle_open(dno, &shand);
if (status)
return status;
// scan the directory for the file
child_ino = 0;
while (child_ino == 0) {
// read next entry
status = fsw_ext2_read_dentry(&shand, &entry);
if (status)
goto errorexit;
if (entry.inode == 0) {
// end of directory reached
status = FSW_NOT_FOUND;
goto errorexit;
}
// compare name
entry_name.len = entry_name.size = entry.name_len;
entry_name.data = entry.name;
if (fsw_streq(lookup_name, &entry_name)) {
child_ino = entry.inode;
break;
}
}
// setup a dnode for the child item
status = fsw_dnode_create(dno, child_ino, FSW_DNODE_TYPE_UNKNOWN, &entry_name, child_dno_out);
errorexit:
fsw_shandle_close(&shand);
return status;
}
static fsw_status_t fsw_iso9660_dir_lookup(struct fsw_iso9660_volume *vol, struct fsw_iso9660_dnode *dno,
struct fsw_string *lookup_name, struct fsw_iso9660_dnode **child_dno_out)
{
fsw_status_t status;
struct fsw_shandle shand;
struct iso9660_dirrec_buffer dirrec_buffer;
struct iso9660_dirrec *dirrec = &dirrec_buffer.dirrec;
// Preconditions: The caller has checked that dno is a directory node.
// setup handle to read the directory
status = fsw_shandle_open(dno, &shand);
if (status)
return status;
// scan the directory for the file
while (1) {
// read next entry
status = fsw_iso9660_read_dirrec(vol, &shand, &dirrec_buffer);
if (status)
goto errorexit;
if (dirrec->dirrec_length == 0) {
// end of directory reached
status = FSW_NOT_FOUND;
goto errorexit;
}
// skip . and ..
if (dirrec->file_identifier_length == 1 &&
(dirrec->file_identifier[0] == 0 || dirrec->file_identifier[0] == 1))
continue;
// compare name
if (fsw_streq(lookup_name, &dirrec_buffer.name)) // TODO: compare case-insensitively
break;
}
// setup a dnode for the child item
status = fsw_dnode_create(dno, dirrec_buffer.ino, FSW_DNODE_TYPE_UNKNOWN, &dirrec_buffer.name, child_dno_out);
if (status == FSW_SUCCESS)
fsw_memcpy(&(*child_dno_out)->dirrec, dirrec, sizeof(struct iso9660_dirrec));
errorexit:
fsw_shandle_close(&shand);
return status;
}
