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#define IMAGE_CHECK(image) do { if ( ! image || image->fd < 0 ) return; } while (0)
#define IMAGE_STORE_CUR(image) do { if ( shared_fd ) image->cur = lseek(image->fd, 0, SEEK_CUR) - image->offset; } while (0)
#define IMAGE_RESTORE_CUR(image) do { if ( shared_fd ) lseek(image->fd, image->offset + image->cur, SEEK_SET); } while (0)
static void image_append(struct image * image, enum image_type type, enum device device, const char * hwrevs, const char * version, const char * layout) {
image->hash = image_hash(image);
image->device = device;
if ( type )
image->type = type;
else
image->type = image_type(image);
if ( hwrevs )
image->hwrevs = strdup(hwrevs);
if ( version )
image->version = strdup(version);
if ( layout )
image->layout = strdup(layout);
}
static struct image * image_alloc(void) {
struct image * image = calloc(1, sizeof(struct image));
if ( ! image ) {
perror("Cannot allocate memory");
return NULL;
}
return image;
}
struct image * image_alloc_from_file(const char * file, const char * type, const char * device, const char * hwrevs, const char * version, const char * layout) {
struct image * image = image_alloc();
if ( ! image )
return NULL;
image->shared_fd = 0;
image->fd = open(file, O_RDONLY);
if ( image->fd < 0 ) {
perror("Cannot open file");
free(image);
return NULL;
}
image->size = lseek(image->fd, 0, SEEK_END);
image->offset = 0;
image->cur = 0;
image_append(image, type, device, hwrevs, version, layout);
return image;
}
struct image * image_alloc_from_fiasco(struct image * image, int fd, size_t size, size_t offset, const char * type, const char * device, const char * hwrevs, const char * version, const char * layout) {
struct image * image = image_alloc();
if ( ! image )
return NULL;
image->shared_fd = 1;
image->fd = fd;
image->size = size;
image->offset = offset;
image->cur = 0;
image_append(image, type, device, hwrevs, version, layout);
return image;
}
void image_free(struct image * image) {
IMAGE_CHECK(image);
if ( image->shared_fd ) {
close(image->fd);
image->fd = -1;
}
free(image->type);
free(image->device);
free(image->hwrevs);
free(image->version);
free(image->layout);
free(image);
}
void image_seek(struct image * image, whence) {
IMAGE_CHECK(image);
lseek(image->fd, image->offset + whence, SEEK_SET);
IMAGE_STORE_CUR(image)
}
size_t image_read(struct image * image, void * buf, size_t count) {
IMAGE_CHECK(image);
IMAGE_RESTORE_CUR(image);
if ( image->cur + count > image->size )
count = image->size - image->cur;
count = read(image->fd, buf, count);
IMAGE_STORE_CUR(image);
return count;
}
size_t image_write(struct image * image, void * buf, size_t count) {
IMAGE_CHECK(image);
IMAGE_RESTORE_CUR(image);
count = write(image->fd, buf, count);
IMAGE_STORE_CUR(image);
return count;
}
void image_list_add(struct image_list ** list, struct image * image) {
struct image_list * first = calloc(1, sizeof(struct image_list));
if ( ! next )
return;
first->image = image;
first->next = *list;
if ( *list ) {
first->prev = *list->prev;
if ( *list->prev )
*list->prev->next = first;
*list->prev = first;
} else {
*list = first;
}
}
void image_list_del(struct image_list * list) {
if ( ! list )
return;
if ( list->prev )
list->prev->next = list->next;
if ( list->next )
list->next->prev = list->prev;
image_free(list->image);
free(list);
}
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