static int write_disk_entry(git_filebuf *file, git_index_entry *entry)
{
struct entry_short *ondisk;
size_t path_len, disk_size;
char *path;
path_len = strlen(entry->path);
if (entry->flags & GIT_IDXENTRY_EXTENDED)
disk_size = long_entry_size(path_len);
else
disk_size = short_entry_size(path_len);
if (git_filebuf_reserve(file, (void **)&ondisk, disk_size) < GIT_SUCCESS)
return GIT_ENOMEM;
memset(ondisk, 0x0, disk_size);
/**
* Yes, we have to truncate.
*
* The on-disk format for Index entries clearly defines
* the time and size fields to be 4 bytes each -- so even if
* we store these values with 8 bytes on-memory, they must
* be truncated to 4 bytes before writing to disk.
*
* In 2038 I will be either too dead or too rich to care about this
*/
ondisk->ctime.seconds = htonl((uint32_t)entry->ctime.seconds);
ondisk->mtime.seconds = htonl((uint32_t)entry->mtime.seconds);
ondisk->ctime.nanoseconds = htonl(entry->ctime.nanoseconds);
ondisk->mtime.nanoseconds = htonl(entry->mtime.nanoseconds);
ondisk->dev = htonl(entry->dev);
ondisk->ino = htonl(entry->ino);
ondisk->mode = htonl(entry->mode);
ondisk->uid = htonl(entry->uid);
ondisk->gid = htonl(entry->gid);
ondisk->file_size = htonl((uint32_t)entry->file_size);
git_oid_cpy(&ondisk->oid, &entry->oid);
ondisk->flags = htons(entry->flags);
if (entry->flags & GIT_IDXENTRY_EXTENDED) {
struct entry_long *ondisk_ext;
ondisk_ext = (struct entry_long *)ondisk;
ondisk_ext->flags_extended = htons(entry->flags_extended);
path = ondisk_ext->path;
}
else
path = ondisk->path;
memcpy(path, entry->path, path_len);
return GIT_SUCCESS;
}
static size_t read_entry(git_index_entry *dest, const void *buffer, size_t buffer_size)
{
size_t path_length, entry_size;
uint16_t flags_raw;
const char *path_ptr;
const struct entry_short *source;
if (INDEX_FOOTER_SIZE + minimal_entry_size > buffer_size)
return 0;
source = (const struct entry_short *)(buffer);
dest->ctime.seconds = ntohl(source->ctime.seconds);
dest->ctime.nanoseconds = ntohl(source->ctime.nanoseconds);
dest->mtime.seconds = ntohl(source->mtime.seconds);
dest->mtime.nanoseconds = ntohl(source->mtime.nanoseconds);
dest->dev = ntohl(source->dev);
dest->ino = ntohl(source->ino);
dest->mode = ntohl(source->mode);
dest->uid = ntohl(source->uid);
dest->gid = ntohl(source->gid);
dest->file_size = ntohl(source->file_size);
git_oid_cpy(&dest->oid, &source->oid);
dest->flags = ntohs(source->flags);
if (dest->flags & GIT_IDXENTRY_EXTENDED) {
struct entry_long *source_l = (struct entry_long *)source;
path_ptr = source_l->path;
flags_raw = ntohs(source_l->flags_extended);
memcpy(&dest->flags_extended, &flags_raw, 2);
} else
path_ptr = source->path;
path_length = dest->flags & GIT_IDXENTRY_NAMEMASK;
/* if this is a very long string, we must find its
* real length without overflowing */
if (path_length == 0xFFF) {
const char *path_end;
path_end = memchr(path_ptr, '\0', buffer_size);
if (path_end == NULL)
return 0;
path_length = path_end - path_ptr;
}
if (dest->flags & GIT_IDXENTRY_EXTENDED)
entry_size = long_entry_size(path_length);
else
entry_size = short_entry_size(path_length);
if (INDEX_FOOTER_SIZE + entry_size > buffer_size)
return 0;
dest->path = git__strdup(path_ptr);
assert(dest->path);
return entry_size;
}
