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libisofs/libisofs/image.c

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/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2009 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#include "libisofs.h"
#include "image.h"
#include "node.h"
#include "messages.h"
#include "eltorito.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
/**
* Create a new image, empty.
*
* The image will be owned by you and should be unref() when no more needed.
*
* @param name
* Name of the image. This will be used as volset_id and volume_id.
* @param image
* Location where the image pointer will be stored.
* @return
* 1 sucess, < 0 error
*/
int iso_image_new(const char *name, IsoImage **image)
{
int res;
IsoImage *img;
if (image == NULL) {
return ISO_NULL_POINTER;
}
img = calloc(1, sizeof(IsoImage));
if (img == NULL) {
return ISO_OUT_OF_MEM;
}
/* local filesystem will be used by default */
res = iso_local_filesystem_new(&(img->fs));
if (res < 0) {
free(img);
return ISO_OUT_OF_MEM;
}
/* use basic builder as default */
res = iso_node_basic_builder_new(&(img->builder));
if (res < 0) {
iso_filesystem_unref(img->fs);
free(img);
return ISO_OUT_OF_MEM;
}
/* fill image fields */
res = iso_node_new_root(&img->root);
if (res < 0) {
iso_node_builder_unref(img->builder);
iso_filesystem_unref(img->fs);
free(img);
return res;
}
img->refcount = 1;
img->id = iso_message_id++;
if (name != NULL) {
img->volset_id = strdup(name);
img->volume_id = strdup(name);
}
img->builder_ignore_acl = 1;
img->builder_ignore_ea = 1;
img->inode_counter = 0;
img->used_inodes = NULL;
img->used_inodes_start = 0;
#ifdef Libisofs_with_checksumS
img->checksum_start_lba = 0;
img->checksum_end_lba = 0;
img->checksum_idx_count = 0;
img->checksum_array = NULL;
#endif
*image = img;
return ISO_SUCCESS;
}
/**
* Increments the reference counting of the given image.
*/
void iso_image_ref(IsoImage *image)
{
++image->refcount;
}
/**
* Decrements the reference couting of the given image.
* If it reaches 0, the image is free, together with its tree nodes (whether
* their refcount reach 0 too, of course).
*/
void iso_image_unref(IsoImage *image)
{
if (--image->refcount == 0) {
int nexcl;
/* we need to free the image */
if (image->user_data_free != NULL) {
/* free attached data */
image->user_data_free(image->user_data);
}
for (nexcl = 0; nexcl < image->nexcludes; ++nexcl) {
free(image->excludes[nexcl]);
}
free(image->excludes);
iso_node_unref((IsoNode*)image->root);
iso_node_builder_unref(image->builder);
iso_filesystem_unref(image->fs);
el_torito_boot_catalog_free(image->bootcat);
free(image->volset_id);
free(image->volume_id);
free(image->publisher_id);
free(image->data_preparer_id);
free(image->system_id);
free(image->application_id);
free(image->copyright_file_id);
free(image->abstract_file_id);
free(image->biblio_file_id);
if (image->used_inodes != NULL)
free(image->used_inodes);
free(image);
}
}
/**
* Attach user defined data to the image. Use this if your application needs
* to store addition info together with the IsoImage. If the image already
* has data attached, the old data will be freed.
*
* @param data
* Pointer to application defined data that will be attached to the
* image. You can pass NULL to remove any already attached data.
* @param give_up
* Function that will be called when the image does not need the data
* any more. It receives the data pointer as an argumente, and eventually
* causes data to be free. It can be NULL if you don't need it.
*/
int iso_image_attach_data(IsoImage *image, void *data, void (*give_up)(void*))
{
if (image == NULL || (data != NULL && free == NULL)) {
return ISO_NULL_POINTER;
}
if (image->user_data != NULL) {
/* free previously attached data */
if (image->user_data_free) {
image->user_data_free(image->user_data);
}
image->user_data = NULL;
image->user_data_free = NULL;
}
if (data != NULL) {
image->user_data = data;
image->user_data_free = give_up;
}
return ISO_SUCCESS;
}
/**
* The the data previously attached with iso_image_attach_data()
*/
void *iso_image_get_attached_data(IsoImage *image)
{
return image->user_data;
}
IsoDir *iso_image_get_root(const IsoImage *image)
{
return image->root;
}
void iso_image_set_volset_id(IsoImage *image, const char *volset_id)
{
free(image->volset_id);
image->volset_id = strdup(volset_id);
}
const char *iso_image_get_volset_id(const IsoImage *image)
{
return image->volset_id;
}
void iso_image_set_volume_id(IsoImage *image, const char *volume_id)
{
free(image->volume_id);
image->volume_id = strdup(volume_id);
}
const char *iso_image_get_volume_id(const IsoImage *image)
{
return image->volume_id;
}
void iso_image_set_publisher_id(IsoImage *image, const char *publisher_id)
{
free(image->publisher_id);
image->publisher_id = strdup(publisher_id);
}
const char *iso_image_get_publisher_id(const IsoImage *image)
{
return image->publisher_id;
}
void iso_image_set_data_preparer_id(IsoImage *image,
const char *data_preparer_id)
{
free(image->data_preparer_id);
image->data_preparer_id = strdup(data_preparer_id);
}
const char *iso_image_get_data_preparer_id(const IsoImage *image)
{
return image->data_preparer_id;
}
void iso_image_set_system_id(IsoImage *image, const char *system_id)
{
free(image->system_id);
image->system_id = strdup(system_id);
}
const char *iso_image_get_system_id(const IsoImage *image)
{
return image->system_id;
}
void iso_image_set_application_id(IsoImage *image, const char *application_id)
{
free(image->application_id);
image->application_id = strdup(application_id);
}
const char *iso_image_get_application_id(const IsoImage *image)
{
return image->application_id;
}
void iso_image_set_copyright_file_id(IsoImage *image,
const char *copyright_file_id)
{
free(image->copyright_file_id);
image->copyright_file_id = strdup(copyright_file_id);
}
const char *iso_image_get_copyright_file_id(const IsoImage *image)
{
return image->copyright_file_id;
}
void iso_image_set_abstract_file_id(IsoImage *image,
const char *abstract_file_id)
{
free(image->abstract_file_id);
image->abstract_file_id = strdup(abstract_file_id);
}
const char *iso_image_get_abstract_file_id(const IsoImage *image)
{
return image->abstract_file_id;
}
void iso_image_set_biblio_file_id(IsoImage *image, const char *biblio_file_id)
{
free(image->biblio_file_id);
image->biblio_file_id = strdup(biblio_file_id);
}
const char *iso_image_get_biblio_file_id(const IsoImage *image)
{
return image->biblio_file_id;
}
int iso_image_get_msg_id(IsoImage *image)
{
return image->id;
}
static
int dir_update_size(IsoImage *image, IsoDir *dir)
{
IsoNode *pos;
pos = dir->children;
while (pos) {
int ret = 1;
if (pos->type == LIBISO_FILE) {
ret = iso_stream_update_size(ISO_FILE(pos)->stream);
} else if (pos->type == LIBISO_DIR) {
/* recurse */
ret = dir_update_size(image, ISO_DIR(pos));
}
if (ret < 0) {
ret = iso_msg_submit(image->id, ret, 0, NULL);
if (ret < 0) {
return ret; /* cancel due error threshold */
}
}
pos = pos->next;
}
return ISO_SUCCESS;
}
int iso_image_update_sizes(IsoImage *image)
{
if (image == NULL) {
return ISO_NULL_POINTER;
}
return dir_update_size(image, image->root);
}
void iso_image_set_ignore_aclea(IsoImage *image, int what)
{
image->builder_ignore_acl = (what & 1);
image->builder_ignore_ea = !!(what & 2);
}
static
int img_register_ino(IsoImage *image, IsoNode *node, int flag)
{
int ret;
ino_t ino;
unsigned int fs_id;
dev_t dev_id;
ret = iso_node_get_id(node, &fs_id, &dev_id, &ino, 1);
if (ret < 0)
return ret;
if (ret > 0 && ino >= image->used_inodes_start &&
ino <= image->used_inodes_start + (ISO_USED_INODE_RANGE - 1)) {
/* without -1 : rollover hazard on 32 bit */
image->used_inodes[(ino - image->used_inodes_start) / 8]
|= (1 << (ino % 8));
}
return 1;
}
/* Collect the bitmap of used inode numbers in the range of
_ImageFsData.used_inodes_start + ISO_USED_INODE_RANGE
@param flag bit0= recursion is active
*/
int img_collect_inos(IsoImage *image, IsoDir *dir, int flag)
{
int ret, register_dir = 1;
IsoDirIter *iter = NULL;
IsoNode *node;
IsoDir *subdir;
if (dir == NULL)
dir = image->root;
if (image->used_inodes == NULL) {
image->used_inodes = calloc(ISO_USED_INODE_RANGE / 8, 1);
if (image->used_inodes == NULL)
return ISO_OUT_OF_MEM;
} else if(!(flag & 1)) {
memset(image->used_inodes, 0, ISO_USED_INODE_RANGE / 8);
} else {
register_dir = 0;
}
if (register_dir) {
node = (IsoNode *) dir;
ret = img_register_ino(image, node, 0);
if (ret < 0)
return ret;
}
ret = iso_dir_get_children(dir, &iter);
if (ret < 0)
return ret;
while (iso_dir_iter_next(iter, &node) == 1 ) {
ret = img_register_ino(image, node, 0);
if (ret < 0)
goto ex;
if (iso_node_get_type(node) == LIBISO_DIR) {
subdir = (IsoDir *) node;
ret = img_collect_inos(image, subdir, flag | 1);
if (ret < 0)
goto ex;
}
}
ret = 1;
ex:;
if (iter != NULL)
iso_dir_iter_free(iter);
return ret;
}
/**
* A global counter for inode numbers for the ISO image filesystem.
* On image import it gets maxed by the eventual inode numbers from PX
* entries. Up to the first 32 bit rollover it simply increments the counter.
* After the first rollover it uses a look ahead bitmap which gets filled
* by a full tree traversal. It covers the next inode numbers to come
* (somewhere between 1 and ISO_USED_INODE_RANGE which is quite many)
* and advances when being exhausted.
* @param image The image where the number shall be used
* @param flag bit0= reset count (Caution: image must get new inos then)
* @return
* Since ino_t 0 is used as default and considered self-unique,
* the value 0 should only be returned in case of error.
*/
ino_t img_give_ino_number(IsoImage *image, int flag)
{
int ret;
ino_t new_ino, ino_idx;
static uint64_t limit = 0xffffffff;
if (flag & 1) {
image->inode_counter = 0;
if (image->used_inodes != NULL)
free(image->used_inodes);
image->used_inodes = NULL;
image->used_inodes_start = 0;
}
new_ino = image->inode_counter + 1;
if (image->used_inodes == NULL) {
if (new_ino > 0 && new_ino <= limit) {
image->inode_counter = new_ino;
return image->inode_counter;
}
}
/* Look for free number in used territory */
while (1) {
if (new_ino <= 0 || new_ino > limit ||
new_ino >= image->used_inodes_start + ISO_USED_INODE_RANGE ) {
/* Collect a bitmap of used inode numbers ahead */
image->used_inodes_start += ISO_USED_INODE_RANGE;
if (image->used_inodes_start > 0xffffffff ||
image->used_inodes_start <= 0)
image->used_inodes_start = 0;
ret = img_collect_inos(image, NULL, 0);
if (ret < 0)
goto return_result; /* >>> need error return value */
new_ino = image->used_inodes_start + !image->used_inodes_start;
}
ino_idx = (new_ino - image->used_inodes_start) / 8;
if (!(image->used_inodes[ino_idx] & (1 << (new_ino % 8)))) {
image->used_inodes[ino_idx] |= (1 << (new_ino % 8));
break;
}
new_ino++;
}
return_result:;
image->inode_counter = new_ino;
return image->inode_counter;
}
/* @param flag bit0= overwrite any ino, else only ino == 0
bit1= install inode with non-data, non-directory files
bit2= install inode with directories
*/
static
int img_update_ino(IsoImage *image, IsoNode *node, int flag)
{
int ret;
ino_t ino;
unsigned int fs_id;
dev_t dev_id;
ret = iso_node_get_id(node, &fs_id, &dev_id, &ino, 1);
if (ret < 0)
return ret;
if (ret == 0)
ino = 0;
if (((flag & 1) || ino == 0) &&
(iso_node_get_type(node) == LIBISO_FILE || (flag & (2 | 4))) &&
((flag & 4) || iso_node_get_type(node) != LIBISO_DIR)) {
ret = iso_node_set_unique_id(node, image, 0);
if (ret < 0)
return ret;
}
return 1;
}
/* @param flag bit0= overwrite any ino, else only ino == 0
bit1= install inode with non-data, non-directory files
bit2= install inode with directories
bit3= with bit2: install inode on parameter dir
*/
int img_make_inos(IsoImage *image, IsoDir *dir, int flag)
{
int ret;
IsoDirIter *iter = NULL;
IsoNode *node;
IsoDir *subdir;
if (flag & 8) {
node = (IsoNode *) dir;
ret = img_update_ino(image, node, flag & 7);
if (ret < 0)
goto ex;
}
ret = iso_dir_get_children(dir, &iter);
if (ret < 0)
return ret;
while (iso_dir_iter_next(iter, &node) == 1) {
ret = img_update_ino(image, node, flag & 7);
if (ret < 0)
goto ex;
if (iso_node_get_type(node) == LIBISO_DIR) {
subdir = (IsoDir *) node;
ret = img_make_inos(image, subdir, flag & ~8);
if (ret < 0)
goto ex;
}
}
ret = 1;
ex:;
if (iter != NULL)
iso_dir_iter_free(iter);
return ret;
}
/* API */
int iso_image_get_session_md5(IsoImage *image, uint32_t *start_lba,
uint32_t *end_lba, char md5[16], int flag)
{
#ifdef Libisofs_with_checksumS
if (image->checksum_array == NULL || image->checksum_idx_count < 1)
return 0;
*start_lba = image->checksum_start_lba;
*end_lba = image->checksum_end_lba;
memcpy(md5, image->checksum_array, 16);
return ISO_SUCCESS;
#else
return 0;
#endif /* ! Libisofs_with_checksumS */
}