LineageOS/android_external_rsync
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Andrew Tridgell
1996-07-01 23:27:19 +00:00
parent 70d794dce9
commit c6e7fcb42b
8 changed files with 111 additions and 60 deletions
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73
util.c
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@@ -31,73 +31,74 @@ int num_waiting(int fd)
return(len);
}
static int map_fd = -1;
static off_t map_size = 0;
static char *p = NULL;
static int p_size = 0;
static int p_offset = 0;
static int p_len = 0;
char *map_file(int fd,off_t len)
struct map_struct *map_file(int fd,off_t len)
{
char *ret = NULL;
struct map_struct *ret;
ret = (struct map_struct *)malloc(sizeof(*ret));
if (!ret) out_of_memory("map_file");
ret->map = NULL;
ret->fd = fd;
ret->size = len;
ret->p = NULL;
ret->p_size = 0;
ret->p_offset = 0;
ret->p_len = 0;
#ifdef HAVE_MMAP
if (len < MAX_MAP_SIZE)
ret = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
#endif
map_fd = fd;
map_size = len;
return ret;
}
char *map_ptr(char *buf,off_t offset,int len)
char *map_ptr(struct map_struct *map,off_t offset,int len)
{
if (buf)
return buf+offset;
if (map->map)
return map->map+offset;
if (len == 0)
return NULL;
len = MIN(len,map_size-offset);
len = MIN(len,map->size-offset);
if (offset >= p_offset &&
offset+len <= p_offset+p_len) {
return (p + (offset - p_offset));
if (offset >= map->p_offset &&
offset+len <= map->p_offset+map->p_len) {
return (map->p + (offset - map->p_offset));
}
len = MAX(len,CHUNK_SIZE);
len = MIN(len,map_size - offset);
len = MIN(len,map->size - offset);
if (len > p_size) {
if (p) free(p);
p = (char *)malloc(len);
if (!p) out_of_memory("map_ptr");
p_size = len;
if (len > map->p_size) {
if (map->p) free(map->p);
map->p = (char *)malloc(len);
if (!map->p) out_of_memory("map_ptr");
map->p_size = len;
}
if (lseek(map_fd,offset,SEEK_SET) != offset ||
read(map_fd,p,len) != len) {
if (lseek(map->fd,offset,SEEK_SET) != offset ||
read(map->fd,map->p,len) != len) {
fprintf(FERROR,"EOF in map_ptr!\n");
exit_cleanup(1);
}
p_offset = offset;
p_len = len;
map->p_offset = offset;
map->p_len = len;
return p;
return map->p;
}
void unmap_file(char *buf,off_t len)
void unmap_file(struct map_struct *map)
{
#ifdef HAVE_MMAP
if (len > 0 && buf)
munmap(buf,len);
if (map->map)
munmap(map->map,map->size);
#endif
map_fd = -1;
map_size = 0;
p_len = 0;
if (map->p) free(map->p);
free(map);
}