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caindex.c
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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include <stddef.h>
#include <sys/stat.h>
#include "cachunk.h"
#include "caformat-util.h"
#include "caformat.h"
#include "caindex.h"
#include "def.h"
#include "util.h"
/* #undef EBADMSG */
/* #define EBADMSG __LINE__ */
/* #undef EINVAL */
/* #define EINVAL __LINE__ */
typedef enum CaIndexMode {
CA_INDEX_WRITE, /* only cooked writing */
CA_INDEX_READ, /* only cooked reading */
CA_INDEX_INCREMENTAL_WRITE, /* cooked writing + incremental raw reading back */
CA_INDEX_INCREMENTAL_READ, /* incremental raw writing + cooked reading back */
} CaIndexMode;
struct CaIndex {
CaIndexMode mode;
int open_flags;
int fd;
mode_t make_mode;
char *path;
char *temporary_path;
bool wrote_eof;
uint64_t start_offset, cooked_offset, raw_offset;
uint64_t item_position;
uint64_t previous_chunk_offset;
uint64_t chunk_size_min;
uint64_t chunk_size_max;
uint64_t chunk_size_avg;
uint64_t feature_flags;
uint64_t file_size; /* The size of the index file */
uint64_t blob_size; /* The size of the blob this index file describes */
};
static inline uint64_t CA_INDEX_METADATA_SIZE(CaIndex *i) {
assert(i);
return i->start_offset + sizeof(CaFormatTableTail);
}
static CaIndex* ca_index_new(void) {
CaIndex *i;
i = new0(CaIndex, 1);
if (!i)
return NULL;
i->fd = -1;
i->make_mode = (mode_t) -1;
i->file_size = UINT64_MAX;
i->blob_size = UINT64_MAX;
i->feature_flags = UINT64_MAX;
return i;
}
CaIndex *ca_index_new_write(void) {
CaIndex *i;
i = ca_index_new();
if (!i)
return NULL;
i->open_flags = O_CLOEXEC|O_NOCTTY|O_WRONLY|O_CREAT|O_EXCL;
i->mode = CA_INDEX_WRITE;
i->feature_flags = 0;
return i;
}
CaIndex *ca_index_new_read(void) {
CaIndex *i;
i = ca_index_new();
if (!i)
return NULL;
i->open_flags = O_CLOEXEC|O_NOCTTY|O_RDONLY;
i->mode = CA_INDEX_READ;
i->feature_flags = UINT64_MAX;
return i;
}
CaIndex *ca_index_new_incremental_write(void) {
CaIndex *i;
i = ca_index_new();
if (!i)
return NULL;
i->open_flags = O_CLOEXEC|O_NOCTTY|O_RDWR|O_CREAT|O_EXCL;
i->mode = CA_INDEX_INCREMENTAL_WRITE;
i->feature_flags = 0;
return i;
}
CaIndex *ca_index_new_incremental_read(void) {
CaIndex *i;
i = ca_index_new();
if (!i)
return NULL;
i->open_flags = O_CLOEXEC|O_NOCTTY|O_RDWR|O_CREAT|O_EXCL;
i->mode = CA_INDEX_INCREMENTAL_READ;
i->feature_flags = UINT64_MAX;
return i;
}
CaIndex *ca_index_unref(CaIndex *i) {
if (!i)
return NULL;
free(i->path);
if (i->temporary_path) {
(void) unlink(i->temporary_path);
free(i->temporary_path);
}
if (i->fd >= 2)
safe_close(i->fd);
return mfree(i);
}
int ca_index_set_make_mode(CaIndex *i, mode_t m) {
if (!i)
return -EINVAL;
if (m & ~0666)
return -EINVAL;
if (i->mode == CA_INDEX_READ)
return -ENOTTY;
if (i->make_mode != (mode_t) -1)
return -EBUSY;
i->make_mode = m;
return 0;
}
int ca_index_set_fd(CaIndex *i, int fd) {
if (!i)
return -EINVAL;
if (i->fd >= 0)
return -EBUSY;
if (i->path)
return -EBUSY;
i->fd = fd;
return 0;
}
int ca_index_set_path(CaIndex *i, const char *path) {
if (!i)
return -EINVAL;
if (i->fd >= 0)
return -EBUSY;
if (i->path)
return -EBUSY;
i->path = strdup(path);
if (!i->path)
return -ENOMEM;
return 0;
}
static int ca_index_open_fd(CaIndex *i) {
const char *p;
int r;
assert(i);
if (i->fd >= 0)
return 0;
switch (i->open_flags & O_ACCMODE) {
case O_RDONLY:
if (!i->path)
return -EUNATCH;
p = i->path;
break;
case O_WRONLY:
case O_RDWR:
if (!i->temporary_path) {
if (i->path) {
r = tempfn_random(i->path, &i->temporary_path);
if (r < 0)
return r;
} else {
const char *d;
r = var_tmp_dir(&d);
if (r < 0)
return r;
if (asprintf(&i->temporary_path, "%s/%" PRIx64 ".caidx", d, random_u64()) < 0)
return -ENOMEM;
}
}
p = i->temporary_path;
break;
default:
assert(false);
}
i->fd = open(p, i->open_flags, 0666 & i->make_mode);
if (i->fd < 0)
return -errno;
return 1;
}
static int ca_index_write_head(CaIndex *i) {
struct {
CaFormatIndex index;
CaFormatHeader table;
} head = {
.index.header.size = htole64(sizeof(CaFormatIndex)),
.index.header.type = htole64(CA_FORMAT_INDEX),
.table.size = htole64(UINT64_MAX),
.table.type = htole64(CA_FORMAT_TABLE),
};
int r;
assert(i);
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return 0;
if (i->start_offset != 0)
return 0;
if (i->feature_flags == UINT64_MAX)
return -EINVAL;
if (i->chunk_size_min == 0 ||
i->chunk_size_avg == 0 ||
i->chunk_size_max == 0)
return -EUNATCH;
if (!(i->chunk_size_min <= i->chunk_size_avg &&
i->chunk_size_avg <= i->chunk_size_max))
return -EINVAL;
head.index.feature_flags = htole64(i->feature_flags);
head.index.chunk_size_min = htole64(i->chunk_size_min);
head.index.chunk_size_avg = htole64(i->chunk_size_avg);
head.index.chunk_size_max = htole64(i->chunk_size_max);
assert(i->cooked_offset == 0);
r = loop_write(i->fd, &head, sizeof(head));
if (r < 0)
return r;
i->start_offset = i->cooked_offset = sizeof(head);
return 0;
}
static int ca_index_enough_data(CaIndex *i, size_t n) {
size_t end;
assert(i);
if (i->mode == CA_INDEX_READ)
return 1;
if (i->mode != CA_INDEX_INCREMENTAL_READ)
return -ENOTTY;
if (i->wrote_eof)
return 1;
end = i->cooked_offset + n;
if (end < i->cooked_offset) /* Overflow? */
return -E2BIG;
if (end > i->raw_offset)
return 0;
return 1;
}
static int ca_index_read_head(CaIndex *i) {
struct {
CaFormatIndex index;
CaFormatHeader table;
} head;
ssize_t n;
int r;
assert(i);
if (!IN_SET(i->mode, CA_INDEX_READ, CA_INDEX_INCREMENTAL_READ))
return 0;
if (i->start_offset != 0) /* already past the head */
return 0;
assert(i->cooked_offset == 0);
r = ca_index_enough_data(i, sizeof(head));
if (r < 0)
return r;
if (r == 0)
return -EAGAIN;
n = loop_read(i->fd, &head, sizeof(head));
if (n < 0)
return (int) n;
if (n != sizeof(head))
return -EPIPE;
if (le64toh(head.index.header.size) != sizeof(CaFormatIndex) ||
le64toh(head.index.header.type) != CA_FORMAT_INDEX)
return -EBADMSG;
r = ca_feature_flags_are_normalized(le64toh(head.index.feature_flags));
if (r < 0)
return r;
if (r == 0)
return -EINVAL;
if (le64toh(head.index.chunk_size_min) < CA_CHUNK_SIZE_LIMIT_MIN ||
le64toh(head.index.chunk_size_min) > CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
if (le64toh(head.index.chunk_size_avg) < CA_CHUNK_SIZE_LIMIT_MIN ||
le64toh(head.index.chunk_size_avg) > CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
if (le64toh(head.index.chunk_size_max) < CA_CHUNK_SIZE_LIMIT_MIN ||
le64toh(head.index.chunk_size_max) > CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
if (!(le64toh(head.index.chunk_size_min) <= le64toh(head.index.chunk_size_avg) &&
le64toh(head.index.chunk_size_avg) <= le64toh(head.index.chunk_size_max)))
return -EBADMSG;
if (le64toh(head.table.size) != UINT64_MAX ||
le64toh(head.table.type) != CA_FORMAT_TABLE)
return -EBADMSG;
i->start_offset = i->cooked_offset = sizeof(head);
i->feature_flags = le64toh(head.index.feature_flags);
i->chunk_size_min = le64toh(head.index.chunk_size_min);
i->chunk_size_avg = le64toh(head.index.chunk_size_avg);
i->chunk_size_max = le64toh(head.index.chunk_size_max);
return 0;
}
int ca_index_open(CaIndex *i) {
int r;
if (!i)
return -EINVAL;
r = ca_index_open_fd(i);
if (r < 0)
return r;
r = ca_index_read_head(i);
if (r < 0 && r != -EAGAIN)
return r;
r = ca_index_write_head(i);
if (r < 0)
return r;
return 0;
}
int ca_index_install(CaIndex *i) {
assert(i);
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE, CA_INDEX_INCREMENTAL_READ))
return -ENOTTY;
if (!i->wrote_eof)
return -EBUSY;
if (!i->temporary_path)
return 0;
if (!i->path)
return 0;
if (rename(i->temporary_path, i->path) < 0)
return -errno;
i->temporary_path = mfree(i->temporary_path);
return 1;
}
int ca_index_write_chunk(CaIndex *i, const CaChunkID *id, uint64_t size) {
CaFormatTableItem item = {};
uint64_t end;
int r;
if (!i)
return -EINVAL;
if (!id)
return -EINVAL;
if (size == 0)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return -ENOTTY;
if (i->wrote_eof)
return -EBUSY;
r = ca_index_open(i);
if (r < 0)
return r;
if (size > i->chunk_size_max)
return -EINVAL;
end = i->previous_chunk_offset + size;
if (end < i->previous_chunk_offset)
return -E2BIG;
/* { */
/* char ids[CA_CHUNK_ID_FORMAT_MAX]; */
/* fprintf(stderr, "WRITING INDEX CHUNK: %s %zu\n", ca_chunk_id_format(id, ids), size); */
/* } */
item.offset = htole64(end);
memcpy(&item.chunk, id, sizeof(CaChunkID));
r = loop_write(i->fd, &item, sizeof(item));
if (r < 0)
return r;
i->previous_chunk_offset = end;
i->cooked_offset += sizeof(item);
i->item_position++;
return 0;
}
int ca_index_write_eof(CaIndex *i) {
CaFormatTableTail tail = {};
int r;
assert(sizeof(CaFormatTableTail) == sizeof(CaFormatTableItem));
if (!i)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return -ENOTTY;
if (i->wrote_eof)
return -EBUSY;
r = ca_index_open(i);
if (r < 0)
return r;
tail.index_offset = htole64(sizeof(CaFormatIndex));
tail.size = htole64(offsetof(CaFormatTable, items) +
(i->item_position * sizeof(CaFormatTableItem)) +
sizeof(tail));
tail.marker = htole64(CA_FORMAT_TABLE_TAIL_MARKER);
r = loop_write(i->fd, &tail, sizeof(tail));
if (r < 0)
return r;
i->cooked_offset += sizeof(tail);
i->wrote_eof = true;
return 0;
}
int ca_index_read_chunk(CaIndex *i, CaChunkID *ret_id, uint64_t *ret_offset_end, uint64_t *ret_size) {
union {
CaFormatTableItem item;
CaFormatTableTail tail;
} buffer;
ssize_t n;
int r;
assert(sizeof(CaFormatTableTail) == sizeof(CaFormatTableItem));
if (!i)
return -EINVAL;
r = ca_index_open(i);
if (r < 0)
return r;
if (!IN_SET(i->mode, CA_INDEX_READ, CA_INDEX_INCREMENTAL_READ))
return -ENOTTY;
r = ca_index_enough_data(i, sizeof(buffer)+1);
if (r < 0)
return r;
if (r == 0)
return -EAGAIN;
n = loop_read(i->fd, &buffer, sizeof(buffer));
if (n < 0)
return (int) n;
if (n != sizeof(buffer))
return -EPIPE;
/* { */
/* char ids[CA_CHUNK_ID_FORMAT_MAX]; */
/* fprintf(stderr, "READING INDEX CHUNK: %s\n", ca_chunk_id_format((const CaChunkID*) item.chunk, ids)); */
/* } */
/* Check if this is the end? */
if (buffer.tail.marker == htole64(CA_FORMAT_TABLE_TAIL_MARKER) &&
buffer.tail._zero_fill1 == 0 &&
buffer.tail._zero_fill2 == 0 &&
buffer.tail.index_offset == htole64(sizeof(CaFormatIndex)) &&
le64toh(buffer.tail.size) == (i->cooked_offset - i->start_offset + offsetof(CaFormatTable, items) + sizeof(CaFormatTableTail))) {
uint8_t final_byte;
/* We try to read one more byte than we expect. if we can read it there's trailing garbage. */
n = read(i->fd, &final_byte, sizeof(final_byte));
if (n < 0)
return -errno;
if (n != 0)
return -EBADMSG;
if (ret_id)
memset(ret_id, 0, sizeof(CaChunkID));
if (ret_offset_end)
*ret_offset_end = UINT64_MAX;
if (ret_size)
*ret_size = 0;
return 0; /* EOF */
}
if (i->previous_chunk_offset != UINT64_MAX &&
i->previous_chunk_offset >= le64toh(buffer.item.offset))
return -EBADMSG;
if (i->previous_chunk_offset != UINT64_MAX &&
(le64toh(buffer.item.offset) - i->previous_chunk_offset) > i->chunk_size_max)
return -EBADMSG;
if (ret_id)
memcpy(ret_id, buffer.item.chunk, sizeof(CaChunkID));
if (ret_offset_end)
*ret_offset_end = le64toh(buffer.item.offset);
if (ret_size)
*ret_size = i->previous_chunk_offset == UINT64_MAX ? UINT64_MAX : (le64toh(buffer.item.offset) - i->previous_chunk_offset);
i->previous_chunk_offset = le64toh(buffer.item.offset);
i->item_position++;
i->cooked_offset += sizeof(buffer);
return 1;
}
int ca_index_set_position(CaIndex *i, uint64_t position) {
uint64_t p, q;
if (!i)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_READ, CA_INDEX_INCREMENTAL_READ))
return -ENOTTY;
if (i->start_offset == 0)
return -ENODATA;
p = position * sizeof(CaFormatTableItem);
if (p < position) /* Overflow? */
return -EINVAL;
q = i->start_offset + p;
if (q < p)
return -EINVAL;
if (lseek(i->fd, q, SEEK_SET) == (off_t) -1)
return -errno;
i->cooked_offset = q;
i->item_position = position;
i->previous_chunk_offset = position == 0 ? 0 : UINT64_MAX;
return 0;
}
int ca_index_get_position(CaIndex *i, uint64_t *ret) {
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
if (i->start_offset == 0)
return -ENODATA;
*ret = i->item_position;
return 0;
}
static int read_file_size(CaIndex *i) {
struct stat st;
assert(i);
if (i->file_size != UINT64_MAX)
return 0;
if (fstat(i->fd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -EBADFD;
i->file_size = st.st_size;
return 1;
}
int ca_index_get_available_chunks(CaIndex *i, uint64_t *ret) {
uint64_t available, metadata_size, n;
int r;
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
r = ca_index_read_head(i);
if (r < 0)
return r;
if (i->start_offset == 0)
return -ENODATA;
if (i->mode == CA_INDEX_READ) {
r = read_file_size(i);
if (r < 0)
return r;
available = i->file_size;
} else if (i->mode == CA_INDEX_INCREMENTAL_READ)
available = i->raw_offset;
else
return -ENOTTY;
metadata_size = CA_INDEX_METADATA_SIZE(i);;
if (available < metadata_size) {
if (i->mode == CA_INDEX_READ || i->wrote_eof)
return -EBADMSG;
*ret = 0;
return 0;
}
n = available - metadata_size;
if ((i->mode == CA_INDEX_READ || i->wrote_eof) &&
(n % sizeof(CaFormatTableItem) != 0))
return -EBADMSG;
*ret = n / sizeof(CaFormatTableItem);
return 0;
}
int ca_index_incremental_write(CaIndex *i, const void *data, size_t size) {
uint64_t new_offset;
ssize_t n;
int r;
if (!i)
return -EINVAL;
if (!data)
return -EINVAL;
if (size == 0)
return -EINVAL;
if (i->mode != CA_INDEX_INCREMENTAL_READ)
return -ENOTTY;
if (i->wrote_eof)
return -EBUSY;
r = ca_index_open(i);
if (r < 0)
return r;
new_offset = i->raw_offset + size;
if (new_offset < i->raw_offset) /* overflow? */
return -EFBIG;
n = pwrite(i->fd, data, size, i->raw_offset);
if (n < 0)
return -errno;
if ((size_t) n != size)
return -EIO;
i->raw_offset = new_offset;
return 0;
}
int ca_index_incremental_eof(CaIndex *i) {
int r;
if (!i)
return -EINVAL;
if (i->mode != CA_INDEX_INCREMENTAL_READ)
return -ENOTTY;
if (i->wrote_eof)
return -EBUSY;
r = ca_index_open(i);
if (r < 0)
return r;
i->wrote_eof = true;
return 0;
}
int ca_index_incremental_read(CaIndex *i, ReallocBuffer *buffer) {
size_t m;
ssize_t n;
char *p;
int r;
if (!i)
return -EINVAL;
if (!buffer)
return -EINVAL;
if (i->mode != CA_INDEX_INCREMENTAL_WRITE)
return -ENOTTY;
r = ca_index_open(i);
if (r < 0)
return r;
if (i->raw_offset >= i->cooked_offset)
return i->wrote_eof ? 0 : -EAGAIN;
m = MIN(BUFFER_SIZE, i->cooked_offset - i->raw_offset);
p = realloc_buffer_acquire(buffer, m);
if (!p)
return -ENOMEM;
n = pread(i->fd, p, m, i->raw_offset);
if (n < 0) {
realloc_buffer_empty(buffer);
return -errno;
}
r = realloc_buffer_shorten(buffer, m - n);
if (r < 0)
return r;
i->raw_offset += n;
return 1;
}
int ca_index_set_chunk_size_min(CaIndex *i, size_t cmin) {
if (!i)
return -EINVAL;
if (cmin < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (cmin > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return -EROFS;
i->chunk_size_min = cmin;
return 0;
}
int ca_index_set_chunk_size_avg(CaIndex *i, size_t cavg) {
if (!i)
return -EINVAL;
if (cavg < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (cavg > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return -EROFS;
i->chunk_size_avg = cavg;
return 0;
}
int ca_index_set_chunk_size_max(CaIndex *i, size_t cmax) {
if (!i)
return -EINVAL;
if (cmax < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (cmax > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!IN_SET(i->mode, CA_INDEX_WRITE, CA_INDEX_INCREMENTAL_WRITE))
return -EROFS;
i->chunk_size_max = cmax;
return 0;
}
int ca_index_get_chunk_size_min(CaIndex *i, size_t *ret) {
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
if (i->chunk_size_min == 0)
return -ENODATA;
*ret = i->chunk_size_min;
return 0;
}
int ca_index_get_chunk_size_avg(CaIndex *i, size_t *ret) {
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
if (i->chunk_size_avg == 0)
return -ENODATA;
*ret = i->chunk_size_avg;
return 0;
}
int ca_index_get_chunk_size_max(CaIndex *i, size_t *ret) {
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
if (i->chunk_size_max == 0)
return -ENODATA;
*ret = i->chunk_size_max;
return 0;
}
int ca_index_get_index_size(CaIndex *i, uint64_t *ret) {
uint64_t size, metadata_size;
int r;
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
r = ca_index_open(i);
if (r < 0)
return r;
r = ca_index_read_head(i);
if (r < 0)
return r;
switch (i->mode) {
case CA_INDEX_READ:
r = read_file_size(i);
if (r < 0)
return r;
size = i->file_size;
break;
case CA_INDEX_INCREMENTAL_READ:
if (!i->wrote_eof)
return -EAGAIN;
size = i->raw_offset;
break;
default:
return -ENOTTY;
}
/* Some size validation checks */
metadata_size = CA_INDEX_METADATA_SIZE(i);
if (size < metadata_size)
return -EBADMSG;
if ((size - metadata_size) % sizeof(CaFormatTableItem) != 0)
return -EBADMSG;
*ret = size;
return 0;
}
int ca_index_get_total_chunks(CaIndex *i, uint64_t *ret) {
uint64_t size;
int r;
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
r = ca_index_get_index_size(i, &size);
if (r < 0)
return r;
*ret = (size - CA_INDEX_METADATA_SIZE(i)) / sizeof(CaFormatTableItem);
return 0;
}
static int ca_index_read_tail(CaIndex *i) {
struct {
CaFormatTableItem last_item;
CaFormatTableTail tail;
} buffer = {};
uint64_t size;
ssize_t l;
int r;
if (!i)
return -EINVAL;
r = ca_index_get_index_size(i, &size);
if (r < 0)
return r;
if (size == CA_INDEX_METADATA_SIZE(i)) {
/* If there's not a single chunk, then the blob has size zero, in this case only read the tail */
l = pread(i->fd, &buffer.tail, sizeof(buffer.tail), size - sizeof(buffer.tail));
if (l < 0)
return -errno;
if (l != sizeof(buffer.tail))
return -EBADMSG;
} else {
/* If there's at least one chunk, then read the last chunk's data, too */
l = pread(i->fd, &buffer, sizeof(buffer), size - sizeof(buffer));
if (l < 0)
return -errno;
if (l != sizeof(buffer))
return -EBADMSG;
}
if (le64toh(buffer.tail.marker) != CA_FORMAT_TABLE_TAIL_MARKER)
return -EBADMSG;
if (le64toh(buffer.tail.index_offset) != sizeof(CaFormatIndex))
return -EBADMSG;
if (le64toh(buffer.tail.size) + sizeof(CaFormatIndex) != size)
return -EBADMSG;
i->blob_size = le64toh(buffer.last_item.offset);
return 0;
}
int ca_index_get_blob_size(CaIndex *i, uint64_t *ret) {
int r;
if (!i)
return -EINVAL;
if (!ret)
return -EINVAL;
if (i->blob_size == UINT64_MAX) {
r = ca_index_read_tail(i);
if (r < 0)
return r;