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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <skalibs/posixplz.h>
#include <skalibs/uint16.h>
#include <skalibs/uint64.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <skalibs/gensetdyn.h>
#include <shibari/dcache.h>
static int write_node_iter (void *data, void *aux)
{
dcache_node *y = data ;
buffer *b = aux ;
char pack[TAI_PACK] ;
uint16_t len ;
if (y->sa.a != y->sa.len) return 1 ;
tai_pack(pack, &y->entry) ;
if (buffer_put(b, pack, TAI_PACK) == -1) return 0 ;
tai_pack(pack + TAI_PACK, &y->expire) ;
if (buffer_put(b, pack, TAI_PACK) == -1) return 0 ;
uint16_unpack_big(y->sa.s + 2, &len) ;
len = y->sa.len - len ;
uint16_pack_big(pack, len) ;
if (buffer_put(b, pack, 2) == -1) return 0 ;
if (buffer_put(b, y->sa.s, y->sa.len) == -1) return 0 ;
if (buffer_put(b, "", 1) == -1) return 0 ;
return 1 ;
}
static inline int dcache_save_to_buffer (dcache const *z, buffer *b)
{
char pack[16] ;
if (buffer_puts(b, DCACHE_MAGIC) == -1) return 0 ;
uint64_pack_big(pack, z->size) ;
uint64_pack_big(pack + 8, z->motion) ;
if (buffer_put(b, pack, 16) < 16) return 0 ;
/* XXX: can gensetdyn_iter blow up the stack if z->storage is huge? */
if (gensetdyn_iter_nocancel((gensetdyn *)&z->storage, gensetdyn_n(&z->storage), &write_node_iter, b) < gensetdyn_n(&z->storage)) return 0 ;
return buffer_flush(b) ;
}
#define N 8192
int dcache_save (dcache const *z, char const *file)
{
size_t len = strlen(file) ;
int fd ;
buffer b ;
char buf[N] ;
char tmp[len + 20] ;
memcpy(tmp, file, len) ;
memcpy(tmp + len, ":dcache_save:XXXXXX", 20) ;
fd = mkstemp(tmp) ;
if (fd == -1) return 0 ;
buffer_init(&b, &buffer_write, fd, buf, N) ;
if (!dcache_save_to_buffer(z, &b) || fsync(fd) == -1) goto err2 ;
fd_close(fd) ;
if (rename(tmp, file) == -1) goto err1 ;
return 1 ;
err2:
fd_close(fd) ;
err1:
unlink_void(tmp) ;
return 0 ;
}
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