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Add support for appendable multisession images.

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This commit is contained in:
Vreixo Formoso 2008-01-04 23:54:31 +01:00
parent 0fdfe05d7e
commit ee78419935
12 changed files with 254 additions and 49 deletions
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1
.bzrignore
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@ -33,3 +33,4 @@ demo/catbuffer
demo/isoread
demo/isocat
demo/isomodify
demo/isoms

7
Makefile.am
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@ -60,7 +60,8 @@ noinst_PROGRAMS = \
demo/iso \
demo/isoread \
demo/isocat \
demo/isomodify
demo/isomodify \
demo/isoms
demo_lsl_CPPFLAGS = -Isrc
demo_lsl_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
@ -98,6 +99,10 @@ demo_isomodify_CPPFLAGS = -Isrc
demo_isomodify_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
demo_isomodify_SOURCES = demo/iso_modify.c
demo_isoms_CPPFLAGS = -Isrc
demo_isoms_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
demo_isoms_SOURCES = demo/iso_ms.c
## Build unit test

5
demo/iso.c
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@ -41,7 +41,10 @@ int main(int argc, char **argv)
0, /* file_mode */
0, /* uid */
0, /* gid */
NULL /* output charset */
NULL, /* output charset */
0, /* appendable */
0, /* ms_block */
NULL /* overwrite */
};
if (argc < 2) {

5
demo/iso_modify.c
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@ -41,7 +41,10 @@ int main(int argc, char **argv)
0, /* file_mode */
0, /* uid */
0, /* gid */
NULL /* output charset */
NULL, /* output charset */
0, /* appendable */
0, /* ms_block */
NULL /* overwrite */
};
struct iso_read_opts ropts = {
0, /* block */

122
demo/iso_ms.c Normal file
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@ -0,0 +1,122 @@
/*
* Little program to show how to create a multisession iso image.
*/
#include "libisofs.h"
#include "libburn/libburn.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
void usage(char **argv)
{
printf("%s LSS NWA DISC DIRECTORY OUTPUT\n", argv[0]);
}
int main(int argc, char **argv)
{
int result;
IsoImage *image;
IsoDataSource *src;
struct burn_source *burn_src;
unsigned char buf[2048];
FILE *fd;
Ecma119WriteOpts opts = {
1, /* level */
1, /* rockridge */
0, /* omit_version_numbers */
0, /* allow_deep_paths */
1, /* sort files */
0, /* replace_dir_mode */
0, /* replace_file_mode */
0, /* replace_uid */
0, /* replace_gid */
0, /* dir_mode */
0, /* file_mode */
0, /* uid */
0, /* gid */
NULL, /* output charset */
0, /* appendable */
0, /* ms_block */
NULL /* overwrite */
};
struct iso_read_opts ropts = {
0, /* block */
0, /* norock */
0, /* nojoliet */
0, /* preferjoliet */
0, /* uid; */
0, /* gid; */
0, /* mode */
"UTF-8" /* input_charset */
};
if (argc < 6) {
usage(argv);
return 1;
}
fd = fopen(argv[5], "w");
if (!fd) {
err(1, "error opening output file");
}
/* create the data source to accesss previous image */
result = iso_data_source_new_from_file(argv[3], &src);
if (result < 0) {
printf ("Error creating data source\n");
return 1;
}
/* create the image context */
result = iso_image_new("volume_id", &image);
if (result < 0) {
printf ("Error creating image\n");
return 1;
}
iso_image_set_msgs_severities(image, "NEVER", "ALL", "");
iso_tree_set_follow_symlinks(image, 0);
iso_tree_set_ignore_hidden(image, 0);
iso_tree_set_stop_on_error(image, 0);
/* import previous image */
ropts.block = atoi(argv[1]);
result = iso_image_import(image, src, &ropts, NULL);
iso_data_source_unref(src);
if (result < 0) {
printf ("Error importing previous session %d\n", result);
return 1;
}
/* add new dir */
result = iso_tree_add_dir_rec(image, iso_image_get_root(image), argv[4]);
if (result < 0) {
printf ("Error adding directory %d\n", result);
return 1;
}
/* generate a multisession image with new contents */
opts.ms_block = atoi(argv[2]);
opts.appendable = 1;
result = iso_image_create(image, &opts, &burn_src);
if (result < 0) {
printf ("Cant create image, error %d\n", result);
return 1;
}
while (burn_src->read(burn_src, buf, 2048) == 2048) {
fwrite(buf, 1, 2048, fd);
}
fclose(fd);
burn_src->free_data(burn_src);
free(burn_src);
iso_image_unref(image);
return 0;
}

3
src/ecma119.c
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@ -754,7 +754,8 @@ int ecma119_image_new(IsoImage *src, Ecma119WriteOpts *opts, Ecma119Image **img)
target->file_mode = opts->replace_file_mode == 2 ? opts->file_mode : 0444;
target->now = time(NULL);
target->ms_block = 0;
target->ms_block = opts->ms_block;
target->appendable = opts->appendable;
/* default to locale charset */
setlocale(LC_CTYPE, "");

1
src/ecma119.h
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@ -66,6 +66,7 @@ struct ecma119_image
char *input_charset;
char *output_charset;
unsigned int appendable : 1;
uint32_t ms_block; /**< start block for a ms image */
time_t now; /**< Time at which writing began. */

27
src/filesrc.c
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@ -113,12 +113,20 @@ static int cmp_by_weight(const void *f1, const void *f2)
return g->sort_weight - f->sort_weight;
}
static
int is_ms_file(void *arg)
{
IsoFileSrc *f = (IsoFileSrc *)arg;
return f->prev_img ? 0 : 1;
}
static
int filesrc_writer_compute_data_blocks(IsoImageWriter *writer)
{
size_t i, size;
Ecma119Image *t;
IsoFileSrc **filelist;
int (*inc_item)(void *);
if (writer == NULL) {
return ISO_MEM_ERROR;
@ -126,14 +134,19 @@ int filesrc_writer_compute_data_blocks(IsoImageWriter *writer)
t = writer->target;
/* on appendable images, ms files shouldn't be included */
if (t->appendable) {
inc_item = is_ms_file;
} else {
inc_item = NULL;
}
/* store the filesrcs in a array */
filelist = (IsoFileSrc**)iso_rbtree_to_array(t->files);
filelist = (IsoFileSrc**)iso_rbtree_to_array(t->files, inc_item, &size);
if (filelist == NULL) {
return ISO_MEM_ERROR;
}
size = iso_rbtree_get_size(t->files);
/* sort files by weight, if needed */
if (t->sort_files) {
qsort(filelist, size, sizeof(void*), cmp_by_weight);
@ -207,8 +220,9 @@ static
int filesrc_writer_write_data(IsoImageWriter *writer)
{
int res;
size_t i, b, nfiles;
size_t i, b;
Ecma119Image *t;
IsoFileSrc *file;
IsoFileSrc **filelist;
char buffer[BLOCK_SIZE];
@ -221,9 +235,8 @@ int filesrc_writer_write_data(IsoImageWriter *writer)
iso_msg_debug(t->image->messenger, "Writing Files...");
nfiles = iso_rbtree_get_size(t->files);
for (i = 0; i < nfiles; ++i) {
IsoFileSrc *file = filelist[i];
i = 0;
while ((file = filelist[i++]) != NULL) {
/*
* TODO WARNING

2
src/fs_image.c
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@ -1475,7 +1475,7 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
/* get our ref to IsoDataSource */
data->src = src;
iso_data_source_ref(src);
data->open_count = 0; //TODO
data->open_count = 0;
/* get an id for the filesystem */
data->id = ++fs_dev_id;

91
src/libisofs.h
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@ -104,36 +104,69 @@ typedef struct
uid_t uid; /** uid to use when replace_uid == 2. */
gid_t gid; /** gid to use when replace_gid == 2. */
char *output_charset; /**< NULL to use default charset */
// uint32_t ms_block;
/**<
* Start block for multisession. When this is greater than 0,
* it's suppossed to be the lba of the next writable address
* on disc; all block lba on image will take this into account,
* and files from a previous session will not be written on
* image. This behavior is only suitable for images to be
* appended to a multisession disc.
* When this is 0, no multisession image will be created. If
* some files are taken from a previous image, its contents
* will be written again to the new image. Use this with new
* images or if you plan to modify an existin image.
/**
* Charset for the RR filenames that will be created.
* NULL to use default charset, the locale one.
*/
// struct data_source* src;
// /**<
// * When modifying a image, this is the source of the original
// * image, used to read file contents.
// * Otherwise it can be NULL.
// */
// uint8_t *overwrite;
// /**<
// * When not NULL, it should point to a buffer of at least
// * 64KiB, where libisofs will write the contents that should
// * be written at the beginning of a overwriteable media, to
// * grow the image.
// * You shoudl initialize the buffer either with 0s, or with
// * the contents of the first blocks of the image you're
// * growing. In most cases, 0 is good enought.
// */
char *output_charset;
/**
* This flags control the type of the image to create. Libisofs support
* two kind of images: stand-alone and appendable.
*
* A stand-alone image is an image that is valid alone, and that can be
* mounted by its own. This is the kind of image you will want to create
* in most cases. A stand-alone image can be burned in an empty CD or DVD,
* or write to an .iso file for future burning or distribution.
*
* On the other side, an appendable image is not self contained, it refers
* to serveral files that are stored outside the image. Its usage is for
* multisession discs, where you add data in a new session, while the
* previous session data can still be accessed. In those cases, the old
* data is not written again. Instead, the new image refers to it, and thus
* it's only valid when appended to the original. Note that in those cases
* the image will be written after the original, and thus you will want
* to use a ms_block greater than 0.
*
* Note that if you haven't import a previous image (by means of
* iso_image_import()), the image will always be a stand-alone image, as
* there is no previous data to refer to.
*/
unsigned int appendable : 1;
/**
* Start block of the image. It is supposed to be the lba where the first
* block of the image will be written on disc. All references inside the
* ISO image will take this into account, thus providing a mountable image.
*
* For appendable images, that are written to a new session, you should
* pass here the lba of the next writable address on disc.
*
* In stand alone images this is usually 0. However, you may want to
* provide a different ms_block if you don't plan to burn the image in the
* first session on disc, such as in some CD-Extra disc whether the data
* image is written in a new session after some audio tracks.
*/
uint32_t ms_block;
/**
* When not NULL, it should point to a buffer of at least 64KiB, where
* libisofs will write the contents that should be written at the beginning
* of a overwriteable media, to grow the image. The growing of an image is
* a way, used by first time in growisofs by Andy Polyakov, to allow the
* appending of new data to non-multisession media, such as DVD+RW, in the
* same way you append a new session to a multisession disc, i.e., without
* need to write again the contents of the previous image.
*
* Note that if you want this kind of image growing, you will also need to
* set appendable to "1" and provide a valid ms_block after the previous
* image.
*
* You should initialize the buffer either with 0s, or with the contents of
* the first blocks of the image you're growing. In most cases, 0 is good
* enought.
*/
uint8_t *overwrite;
} Ecma119WriteOpts;
typedef struct Iso_Data_Source IsoDataSource;

11
src/util.h
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@ -193,12 +193,21 @@ size_t iso_rbtree_get_size(IsoRBTree *tree);
/**
* Get an array view of the elements of the tree.
*
* @param include_item
* Function to select which elements to include in the array. It that takes
* a pointer to an element and returns 1 if the element should be included,
* 0 if not. If you want to add all elements to the array, you can pass a
* NULL pointer.
* @param size
* If not null, will be filled with the number of elements in the array,
* without counting the final NULL item.
* @return
* A sorted array with the contents of the tree, or NULL if there is not
* enought memory to allocate the array. You should free(3) the array when
* no more needed. Note that the array is NULL-terminated, and thus it
* has size + 1 length.
*/
void **iso_rbtree_to_array(IsoRBTree *tree);
void **iso_rbtree_to_array(IsoRBTree *tree, int (*include_item)(void *),
size_t *size);
#endif /*LIBISO_UTIL_H_*/

28
src/util_rbtree.c
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@ -244,28 +244,38 @@ size_t iso_rbtree_get_size(IsoRBTree *tree)
}
static
int rbtree_to_array_aux(struct iso_rbnode *root, void **array, size_t pos)
size_t rbtree_to_array_aux(struct iso_rbnode *root, void **array, size_t pos,
int (*include_item)(void *))
{
if (root == NULL) {
return pos;
}
pos = rbtree_to_array_aux(root->ch[0], array, pos);
array[pos++] = root->data;
pos = rbtree_to_array_aux(root->ch[1], array, pos);
pos = rbtree_to_array_aux(root->ch[0], array, pos, include_item);
if (include_item == NULL || include_item(root->data)) {
array[pos++] = root->data;
}
pos = rbtree_to_array_aux(root->ch[1], array, pos, include_item);
return pos;
}
/**
* Get an array view of the elements of the tree.
*
* @param include_item
* Function to select which elements to include in the array. It that takes
* a pointer to an element and returns 1 if the element should be included,
* 0 if not. If you want to add all elements to the array, you can pass a
* NULL pointer.
* @return
* A sorted array with the contents of the tree, or NULL if there is not
* enought memory to allocate the array. You should free(3) the array when
* no more needed. Note that the array is NULL-terminated, and thus it
* has size + 1 length.
*/
void ** iso_rbtree_to_array(IsoRBTree *tree)
void ** iso_rbtree_to_array(IsoRBTree *tree, int (*include_item)(void *),
size_t *size)
{
size_t pos;
void **array;
array = malloc((tree->size + 1) * sizeof(void*));
@ -274,9 +284,13 @@ void ** iso_rbtree_to_array(IsoRBTree *tree)
}
/* fill array */
rbtree_to_array_aux(tree->root, array, 0);
array[tree->size] = NULL;
pos = rbtree_to_array_aux(tree->root, array, 0, include_item);
array[pos] = NULL;
array = realloc(array, (pos + 1) * sizeof(void*));
if (size) {
*size = pos;
}
return array;
}