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Fixed a bug with reading to far in get_record index. Thanks to Darren Moore for reporting this.

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This commit is contained in:
nvt-se 2009-07-16 11:58:44 +00:00
parent af981496b1
commit 62b380b0a6
1 changed files with 15 additions and 15 deletions
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30
core/cfs/cfs-coffee.c
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@ -120,7 +120,7 @@ struct file {
cfs_offset_t end;
coffee_page_t page;
coffee_page_t max_pages;
int16_t next_log_record;
int16_t record_count;
uint8_t references;
uint8_t flags;
};
@ -372,7 +372,8 @@ load_file(coffee_page_t start, struct file_header *hdr)
if(HDR_MODIFIED(*hdr)) {
file->flags |= COFFEE_FILE_MODIFIED;
}
file->next_log_record = -1;
/* We don't know the amount of records yet. */
file->record_count = -1;
return file;
}
@ -595,9 +596,11 @@ modify_log_buffer(uint16_t log_record_size,
region = *offset / log_record_size;
*offset %= log_record_size;
if(*size > log_record_size - *offset) {
*size = log_record_size - *offset;
}
return region;
}
#endif /* COFFEE_MICRO_LOGS */
@ -646,7 +649,8 @@ get_record_index(coffee_page_t log_page, uint16_t search_records,
/*---------------------------------------------------------------------------*/
#if COFFEE_MICRO_LOGS
static int
read_log_page(struct file_header *hdr, int16_t last_record, struct log_param *lp)
read_log_page(struct file_header *hdr, int16_t record_count,
struct log_param *lp)
{
uint16_t region;
int16_t match_index;
@ -658,7 +662,7 @@ read_log_page(struct file_header *hdr, int16_t last_record, struct log_param *lp
adjust_log_config(hdr, &log_record_size, &log_records);
region = modify_log_buffer(log_record_size, &lp->offset, &lp->size);
search_records = last_record < 0 ? log_records : last_record + 1;
search_records = record_count < 0 ? log_records : record_count;
match_index = get_record_index(hdr->log_page, search_records, region);
if(match_index < 0) {
return -1;
@ -677,7 +681,6 @@ read_log_page(struct file_header *hdr, int16_t last_record, struct log_param *lp
static coffee_page_t
create_log(struct file *file, struct file_header *hdr)
{
coffee_page_t log_page;
uint16_t log_record_size, log_records;
cfs_offset_t size;
struct file *log_file;
@ -691,14 +694,13 @@ create_log(struct file *file, struct file_header *hdr)
if(log_file == NULL) {
return INVALID_PAGE;
}
log_page = log_file->page;
hdr->flags |= HDR_FLAG_MODIFIED;
hdr->log_page = log_page;
hdr->log_page = log_file->page;
write_header(hdr, file->page);
file->flags |= COFFEE_FILE_MODIFIED;
return log_page;
return log_file->page;
}
#endif /* COFFEE_MICRO_LOGS */
/*---------------------------------------------------------------------------*/
@ -743,8 +745,7 @@ merge_log(coffee_page_t file_page, int extend)
watchdog_start();
return -1;
} else if(n > 0) {
COFFEE_WRITE(buf, n,
absolute_offset(new_file->page, offset));
COFFEE_WRITE(buf, n, absolute_offset(new_file->page, offset));
offset += n;
}
} while(n != 0);
@ -785,8 +786,8 @@ find_next_record(struct file *file, coffee_page_t log_page,
{
int log_record, preferred_batch_size;
if(file->next_log_record >= 0) {
return file->next_log_record;
if(file->record_count >= 0) {
return file->record_count;
}
preferred_batch_size = log_records > COFFEE_LOG_TABLE_LIMIT ?
@ -880,7 +881,7 @@ write_log_page(struct file *file, struct log_param *lp)
offset += log_records * sizeof(region);
COFFEE_WRITE(copy_buf, sizeof(copy_buf),
offset + log_record * log_record_size);
file->next_log_record = log_record + 1;
file->record_count = log_record + 1;
}
return lp->size;
@ -1036,7 +1037,7 @@ cfs_read(int fd, void *buf, unsigned size)
lp.offset = fdp->offset;
lp.buf = buf;
lp.size = bytes_left;
r = read_log_page(&hdr, file->next_log_record, &lp);
r = read_log_page(&hdr, file->record_count, &lp);
}
#endif /* COFFEE_MICRO_LOGS */
/* Read from the original file if we cannot find the data in the log. */
@ -1062,7 +1063,6 @@ cfs_write(int fd, const void *buf, unsigned size)
cfs_offset_t bytes_left;
const char dummy[1] = { 0xff };
#endif
if(!(FD_VALID(fd) && FD_WRITABLE(fd))) {
return -1;
}