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Support for image modify.

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This commit is contained in:
Vreixo Formoso 2008-01-04 00:15:48 +01:00
commit 932ce6ac70
10 changed files with 534 additions and 82 deletions
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1
.bzrignore
View File

@ -32,3 +32,4 @@ demo/iso
demo/catbuffer
demo/isoread
demo/isocat
demo/isomodify

8
Makefile.am
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@ -15,6 +15,7 @@ src_libisofs_la_SOURCES = \
src/error.h \
src/node.h \
src/node.c \
src/tree.h \
src/tree.c \
src/image.h \
src/image.c \
@ -58,7 +59,8 @@ noinst_PROGRAMS = \
demo/ecma119tree \
demo/iso \
demo/isoread \
demo/isocat
demo/isocat \
demo/isomodify
demo_lsl_CPPFLAGS = -Isrc
demo_lsl_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
@ -92,6 +94,10 @@ demo_isocat_CPPFLAGS = -Isrc
demo_isocat_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
demo_isocat_SOURCES = demo/iso_cat.c
demo_isomodify_CPPFLAGS = -Isrc
demo_isomodify_LDADD = $(src_libisofs_la_OBJECTS) $(THREAD_LIBS)
demo_isomodify_SOURCES = demo/iso_modify.c
## Build unit test

10
demo/iso_cat.c
View File

@ -27,6 +27,7 @@ int main(int argc, char **argv)
IsoFileSource *file;
struct stat info;
IsoDataSource *src;
struct libiso_msgs *messenger;
struct iso_read_opts opts = {
0, /* block */
0, /* norock */
@ -35,7 +36,6 @@ int main(int argc, char **argv)
0, /* uid; */
0, /* gid; */
0, /* mode */
NULL, /* messenger */
"UTF-8" /* input_charset */
};
@ -44,12 +44,12 @@ int main(int argc, char **argv)
return 1;
}
res = libiso_msgs_new(&opts.messenger, 0);
res = libiso_msgs_new(&messenger, 0);
if (res <= 0) {
printf ("Can't create messenger\n");
return 1;
}
libiso_msgs_set_severities(opts.messenger, LIBISO_MSGS_SEV_NEVER,
libiso_msgs_set_severities(messenger, LIBISO_MSGS_SEV_NEVER,
LIBISO_MSGS_SEV_ALL, "", 0);
res = iso_data_source_new_from_file(argv[1], &src);
@ -58,7 +58,7 @@ int main(int argc, char **argv)
return 1;
}
res = iso_image_filesystem_new(src, &opts, &fs);
res = iso_image_filesystem_new(src, &opts, messenger, &fs);
if (res < 0) {
printf ("Error creating filesystem\n");
return 1;
@ -99,6 +99,6 @@ int main(int argc, char **argv)
iso_file_source_unref(file);
iso_filesystem_unref(fs);
iso_data_source_unref(src);
libiso_msgs_destroy(&opts.messenger, 0);
libiso_msgs_destroy(&messenger, 0);
return 0;
}

116
demo/iso_modify.c Normal file
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@ -0,0 +1,116 @@
/*
* Little program to show how to modify an 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 [OPTIONS] IMAGE 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 */
0, /* 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 */
};
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 < 4) {
usage(argv);
return 1;
}
fd = fopen(argv[3], "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[1], &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 */
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[2]);
if (result < 0) {
printf ("Error adding directory %d\n", result);
return 1;
}
/* generate a new image with both previous and added contents */
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;
}

12
demo/iso_read.c
View File

@ -111,6 +111,7 @@ int main(int argc, char **argv)
IsoImageFilesystem *fs;
IsoDataSource *src;
IsoFileSource *root;
struct libiso_msgs *messenger;
struct iso_read_opts opts = {
0, /* block */
0, /* norock */
@ -119,7 +120,6 @@ int main(int argc, char **argv)
0, /* uid; */
0, /* gid; */
0, /* mode */
NULL, /* messenger */
"UTF-8" /* input_charset */
};
@ -128,12 +128,12 @@ int main(int argc, char **argv)
return 1;
}
result = libiso_msgs_new(&opts.messenger, 0);
result = libiso_msgs_new(&messenger, 0);
if (result <= 0) {
printf ("Can't create messenger\n");
return 1;
}
libiso_msgs_set_severities(opts.messenger, LIBISO_MSGS_SEV_NEVER,
libiso_msgs_set_severities(messenger, LIBISO_MSGS_SEV_NEVER,
LIBISO_MSGS_SEV_ALL, "", 0);
result = iso_data_source_new_from_file(argv[1], &src);
@ -142,7 +142,7 @@ int main(int argc, char **argv)
return 1;
}
result = iso_image_filesystem_new(src, &opts, &fs);
result = iso_image_filesystem_new(src, &opts, messenger, &fs);
if (result < 0) {
printf ("Error creating filesystem\n");
return 1;
@ -160,6 +160,6 @@ int main(int argc, char **argv)
fs->close(fs);
iso_filesystem_unref((IsoFilesystem*)fs);
iso_data_source_unref(src);
libiso_msgs_destroy(&opts.messenger, 0);
return 0;
libiso_msgs_destroy(&messenger, 0);
return 0;
}

287
src/fs_image.c
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@ -16,11 +16,14 @@
#include "ecma119.h"
#include "messages.h"
#include "rockridge.h"
#include "image.h"
#include "tree.h"
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <langinfo.h>
#include <limits.h>
static int ifs_fs_open(IsoImageFilesystem *fs);
@ -334,7 +337,7 @@ int read_dir(ImageFileSourceData *data)
}
/* add to the child list */
{
if (ret != 0) {
struct child_list *node;
node = malloc(sizeof(struct child_list));
if (node == NULL) {
@ -368,7 +371,7 @@ int ifs_open(IsoFileSource *src)
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
if (data->opened) {
return ISO_FILE_ALREADY_OPENNED;
}
@ -561,7 +564,7 @@ int ifs_readdir(IsoFileSource *src, IsoFileSource **child)
/* free the first element of the list */
data->data.content = children->next;
free(children);
return ISO_SUCCESS;
}
@ -891,6 +894,8 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
}
}
//TODO convert link destinatiion to needed charset
} else {
/* RR extensions are not read / used */
atts.st_mode = fsdata->mode;
@ -943,7 +948,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
ret = iso_file_source_new_ifs(fs, parent, (struct ecma119_dir_record*)
buffer, src);
if (ret < 0) {
if (ret <= 0) {
return ret;
}
@ -1257,6 +1262,7 @@ void ifs_fs_free(IsoFilesystem *fs)
free(data->biblio_file_id);
free(data->input_charset);
free(data->local_charset);
free(data);
}
@ -1442,6 +1448,7 @@ int read_pvm(_ImageFsData *data, uint32_t block)
}
int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
struct libiso_msgs *messenger,
IsoImageFilesystem **fs)
{
int ret;
@ -1477,7 +1484,7 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
data->gid = opts->gid;
data->uid = opts->uid;
data->mode = opts->mode & ~S_IFMT;
data->messenger = opts->messenger;
data->messenger = messenger;
data->input_charset = strdup(opts->input_charset);
@ -1608,3 +1615,273 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
free(ifs);
return ret;
}
static
int image_builder_create_node(IsoNodeBuilder *builder, IsoImage *image,
IsoFileSource *src, IsoNode **node)
{
int result;
struct stat info;
IsoNode *new;
char *name;
ImageFileSourceData *data;
if (builder == NULL || src == NULL || node == NULL || src->data == NULL) {
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
name = iso_file_source_get_name(src);
/* get info about source */
result = iso_file_source_lstat(src, &info);
if (result < 0) {
return result;
}
new = NULL;
switch (info.st_mode & S_IFMT) {
case S_IFREG:
{
/* source is a regular file */
IsoStream *stream;
IsoFile *file;
result = iso_file_source_stream_new(src, &stream);
if (result < 0) {
free(name);
return result;
}
/* take a ref to the src, as stream has taken our ref */
iso_file_source_ref(src);
file = calloc(1, sizeof(IsoFile));
if (file == NULL) {
free(name);
iso_stream_unref(stream);
return ISO_MEM_ERROR;
}
/* the msblock is taken from the image */
file->msblock = data->block;
/*
* and we set the sort weight based on the block on image, to
* improve performance on image modifying.
*/
file->sort_weight = INT_MAX - data->block;
file->stream = stream;
file->node.type = LIBISO_FILE;
new = (IsoNode*) file;
}
break;
case S_IFDIR:
{
/* source is a directory */
new = calloc(1, sizeof(IsoDir));
if (new == NULL) {
free(name);
return ISO_MEM_ERROR;
}
new->type = LIBISO_DIR;
}
break;
case S_IFLNK:
{
/* source is a symbolic link */
char dest[PATH_MAX];
IsoSymlink *link;
result = iso_file_source_readlink(src, dest, PATH_MAX);
if (result < 0) {
free(name);
return result;
}
link = malloc(sizeof(IsoSymlink));
if (link == NULL) {
free(name);
return ISO_MEM_ERROR;
}
link->dest = strdup(dest);
link->node.type = LIBISO_SYMLINK;
new = (IsoNode*) link;
}
break;
case S_IFSOCK:
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
{
/* source is an special file */
IsoSpecial *special;
special = malloc(sizeof(IsoSpecial));
if (special == NULL) {
free(name);
return ISO_MEM_ERROR;
}
special->dev = info.st_rdev;
special->node.type = LIBISO_SPECIAL;
new = (IsoNode*) special;
}
break;
}
/* fill fields */
new->refcount = 1;
new->name = name;
new->mode = info.st_mode;
new->uid = info.st_uid;
new->gid = info.st_gid;
new->atime = info.st_atime;
new->mtime = info.st_mtime;
new->ctime = info.st_ctime;
new->hidden = 0;
new->parent = NULL;
new->next = NULL;
*node = new;
return ISO_SUCCESS;
}
/**
* Create a new builder, that is exactly a copy of an old builder, but where
* create_node() function has been replaced by image_builder_create_node.
*/
int iso_image_builder_new(IsoNodeBuilder *old, IsoNodeBuilder **builder)
{
IsoNodeBuilder *b;
if (builder == NULL) {
return ISO_NULL_POINTER;
}
b = malloc(sizeof(IsoNodeBuilder));
if (b == NULL) {
return ISO_MEM_ERROR;
}
b->refcount = 1;
b->create_file_data = old->create_file_data;
b->create_node_data = old->create_node_data;
b->create_file = old->create_file;
b->create_node = image_builder_create_node;
b->free = old->free;
*builder = b;
return ISO_SUCCESS;
}
int iso_image_import(IsoImage *image, IsoDataSource *src,
struct iso_read_opts *opts,
struct iso_read_image_features *features)
{
int ret;
IsoImageFilesystem *fs;
IsoFilesystem *fsback;
IsoNodeBuilder *blback;
IsoDir *oldroot;
IsoFileSource *newroot;
if (image == NULL || src == NULL || opts == NULL) {
return ISO_NULL_POINTER;
}
ret = iso_image_filesystem_new(src, opts, image->messenger, &fs);
if (ret < 0) {
return ret;
}
/* get root from filesystem */
ret = fs->fs.get_root((IsoFilesystem*)fs, &newroot);
if (ret < 0) {
return ret;
}
/* backup image filesystem, builder and root */
fsback = image->fs;
blback = image->builder;
oldroot = image->root;
/* create new builder */
ret = iso_image_builder_new(blback, &image->builder);
if (ret < 0) {
goto import_revert;
}
image->fs = (IsoFilesystem*)fs;
/* create new root, and set root attributes from source */
ret = iso_node_new_root(&image->root);
if (ret < 0) {
goto import_revert;
}
{
struct stat info;
/* I know this will not fail */
iso_file_source_lstat(newroot, &info);
image->root->node.mode = info.st_mode;
image->root->node.uid = info.st_uid;
image->root->node.gid = info.st_gid;
image->root->node.atime = info.st_atime;
image->root->node.mtime = info.st_mtime;
image->root->node.ctime = info.st_ctime;
}
/* recursively add image */
ret = iso_add_dir_src_rec(image, image->root, newroot);
iso_node_builder_unref(image->builder);
/* error during recursive image addition? */
if (ret <= 0) {
goto import_revert;
}
/* free old root */
iso_node_unref((IsoNode*)oldroot);
/* recover backed fs and builder */
image->fs = fsback;
image->builder = blback;
{
_ImageFsData *data;
data = fs->fs.data;
/* set volume attributes */
iso_image_set_volset_id(image, data->volset_id);
iso_image_set_volume_id(image, data->volume_id);
iso_image_set_publisher_id(image, data->publisher_id);
iso_image_set_data_preparer_id(image, data->data_preparer_id);
iso_image_set_system_id(image, data->system_id);
iso_image_set_application_id(image, data->application_id);
iso_image_set_copyright_file_id(image, data->copyright_file_id);
iso_image_set_abstract_file_id(image, data->abstract_file_id);
iso_image_set_biblio_file_id(image, data->biblio_file_id);
if (features != NULL) {
features->hasJoliet = data->joliet;
features->hasRR = data->rr_version != 0;
features->size = data->nblocks;
}
}
ret = ISO_SUCCESS;
goto import_cleanup;
import_revert:;
image->root = oldroot;
image->fs = fsback;
import_cleanup:;
iso_file_source_unref(newroot);
fs->close(fs);
iso_filesystem_unref((IsoFilesystem*)fs);
return ret;
}

63
src/fs_image.h
View File

@ -12,67 +12,7 @@
#include "libisofs.h"
#include "fsource.h"
/**
* Options for image reading.
* There are four kind of options:
* - Related to multisession support.
* In most cases, an image begins at LBA 0 of the data source. However,
* in multisession discs, the later image begins in the last session on
* disc. The block option can be used to specify the start of that last
* session.
* - Related to the tree that will be read.
* As default, when Rock Ridge extensions are present in the image, that
* will be used to get the tree. If RR extensions are not present, libisofs
* will use the Joliet extensions if available. Finally, the plain ISO-9660
* tree is used if neither RR nor Joliet extensions are available. With
* norock, nojoliet, and preferjoliet options, you can change this
* default behavior.
* - Related to default POSIX attributes.
* When Rock Ridege extensions are not used, libisofs can't figure out what
* are the the permissions, uid or gid for the files. You should supply
* default values for that.
* - Return information for image.
* Both size, hasRR and hasJoliet will be filled by libisofs with suitable values.
* Also, error is set to non-0 if some error happens (error codes are
* private now)
*/
struct iso_read_opts
{
/**
* Block where the image begins, usually 0, can be different on a
* multisession disc.
*/
uint32_t block;
unsigned int norock : 1; /*< Do not read Rock Ridge extensions */
unsigned int nojoliet : 1; /*< Do not read Joliet extensions */
/**
* When both Joliet and RR extensions are present, the RR tree is used.
* If you prefer using Joliet, set this to 1.
*/
unsigned int preferjoliet : 1;
uid_t uid; /**< Default uid when no RR */
gid_t gid; /**< Default uid when no RR */
mode_t mode; /**< Default mode when no RR (only permissions) */
//TODO differ file and dir mode
//option to convert names to lower case?
struct libiso_msgs *messenger;
char *input_charset;
/* modified by the function */
// unsigned int hasRR:1; /*< It will be set to 1 if RR extensions are present,
// to 0 if not. */
// unsigned int hasJoliet:1; /*< It will be set to 1 if Joliet extensions are
// present, to 0 if not. */
// uint32_t size; /**< Will be filled with the size (in 2048 byte block) of
// * the image, as reported in the PVM. */
//int error;
};
struct libiso_msgs;
typedef struct Iso_Image_Filesystem IsoImageFilesystem;
/**
@ -104,6 +44,7 @@ struct Iso_Image_Filesystem
};
int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
struct libiso_msgs *messenger,
IsoImageFilesystem **fs);
#endif /*LIBISO_FS_IMAGE_H_*/

88
src/libisofs.h
View File

@ -202,6 +202,72 @@ struct Iso_Data_Source {
void *data;
};
/**
* Options for image reading.
* There are four kind of options:
* - Related to multisession support.
* In most cases, an image begins at LBA 0 of the data source. However,
* in multisession discs, the later image begins in the last session on
* disc. The block option can be used to specify the start of that last
* session.
* - Related to the tree that will be read.
* As default, when Rock Ridge extensions are present in the image, that
* will be used to get the tree. If RR extensions are not present, libisofs
* will use the Joliet extensions if available. Finally, the plain ISO-9660
* tree is used if neither RR nor Joliet extensions are available. With
* norock, nojoliet, and preferjoliet options, you can change this
* default behavior.
* - Related to default POSIX attributes.
* When Rock Ridege extensions are not used, libisofs can't figure out what
* are the the permissions, uid or gid for the files. You should supply
* default values for that.
*/
struct iso_read_opts
{
/**
* Block where the image begins, usually 0, can be different on a
* multisession disc.
*/
uint32_t block;
unsigned int norock : 1; /*< Do not read Rock Ridge extensions */
unsigned int nojoliet : 1; /*< Do not read Joliet extensions */
/**
* When both Joliet and RR extensions are present, the RR tree is used.
* If you prefer using Joliet, set this to 1.
*/
unsigned int preferjoliet : 1;
uid_t uid; /**< Default uid when no RR */
gid_t gid; /**< Default uid when no RR */
mode_t mode; /**< Default mode when no RR (only permissions) */
//TODO differ file and dir mode
//option to convert names to lower case?
char *input_charset;
};
/**
* Return information for image.
* Both size, hasRR and hasJoliet will be filled by libisofs with suitable
* values.
*/
struct iso_read_image_features
{
/** It will be set to 1 if RR extensions are present, to 0 if not. */
unsigned int hasRR:1;
/** It will be set to 1 if Joliet extensions are present, to 0 if not. */
unsigned int hasJoliet:1;
/**
* Will be filled with the size (in 2048 byte block) of the image, as
* reported in the PVM.
*/
uint32_t size;
};
/**
* Create a new image, empty.
*
@ -223,6 +289,28 @@ int iso_image_new(const char *name, IsoImage **image);
int iso_image_create(IsoImage *image, Ecma119WriteOpts *opts,
struct burn_source **burn_src);
/**
* Import a previous session or image, for growing or modify.
*
* @param image
* The image context to which old image will be imported. Note that all
* files added to image, and image attributes, will be replaced with the
* contents of the old image. TODO support for merging old image files
* @param src
* Data Source from which old image will be read. A extra reference is
* added, so you still need to iso_data_source_unref() yours.
* @param opts
* Options for image import
* @param features
* Will be filled with the features of the old image. You can pass NULL
* if you're not interested on them.
* @return
* 1 on success, < 0 on error
*/
int iso_image_import(IsoImage *image, IsoDataSource *src,
struct iso_read_opts *opts,
struct iso_read_image_features *features);
/**
* Increments the reference counting of the given image.
*/

10
src/tree.c
View File

@ -17,6 +17,7 @@
#include "fsource.h"
#include "builder.h"
#include "messages.h"
#include "tree.h"
#include <stdlib.h>
#include <string.h>
@ -446,11 +447,12 @@ int check_hidden(IsoImage *image, const char *name)
}
/**
* Recursively add a given directory to the image tree.
*
* @return
* 1 continue, 0 stop, < 0 error
*/
static
int iso_add_dir_aux(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
int iso_add_dir_src_rec(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
{
int result;
int action; /* 1 add, 2 skip, 3 stop, < 0 error */
@ -564,7 +566,7 @@ int iso_add_dir_aux(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
/* finally, if the node is a directory we need to recurse */
if (new->type == LIBISO_DIR) {
result = iso_add_dir_aux(image, (IsoDir*)new, file);
result = iso_add_dir_src_rec(image, (IsoDir*)new, file);
iso_file_source_unref(file);
if (result < 0) {
/* error */
@ -631,7 +633,7 @@ int iso_tree_add_dir_rec(IsoImage *image, IsoDir *parent, const char *dir)
iso_file_source_unref(file);
return ISO_FILE_IS_NOT_DIR;
}
result = iso_add_dir_aux(image, parent, file);
result = iso_add_dir_src_rec(image, parent, file);
iso_file_source_unref(file);
return result;
}

21
src/tree.h Normal file
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@ -0,0 +1,21 @@
/*
* Copyright (c) 2007 Vreixo Formoso
*
* 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.
*/
#ifndef LIBISO_IMAGE_TREE_H_
#define LIBISO_IMAGE_TREE_H_
#include "image.h"
/**
* Recursively add a given directory to the image tree.
*
* @return
* 1 continue, 0 stop, < 0 error
*/
int iso_add_dir_src_rec(IsoImage *image, IsoDir *parent, IsoFileSource *dir);
#endif /*LIBISO_IMAGE_TREE_H_*/