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Add open() and close() operations to IsoFilesystem.

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This commit is contained in:
Vreixo Formoso 2008-01-19 16:56:46 +01:00
parent 52d1e911ac
commit 0c1ea8cc7e
5 changed files with 102 additions and 66 deletions
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2
demo/iso_read.c
View File

@ -157,7 +157,7 @@ int main(int argc, char **argv)
printf("\nDIRECTORY TREE\n");
printf("==============\n");
result = fs->fs.get_root((IsoFilesystem*)fs, &root);
result = fs->get_root(fs, &root);
if (result < 0) {
printf ("Can't get root %d\n", result);
return 1;

71
src/fs_image.c
View File

@ -291,7 +291,7 @@ int read_dir(ImageFileSourceData *data)
}
fs = data->fs;
fsdata = fs->fs.data;
fsdata = fs->data;
block = data->block;
ret = fsdata->src->read_block(fsdata->src, block, buffer);
@ -529,7 +529,7 @@ int ifs_read(IsoFileSource *src, void *buf, size_t count)
/* EOF */
break;
}
fsdata = data->fs->fs.data;
fsdata = data->fs->data;
block = data->block + (data->data.offset / BLOCK_SIZE);
ret = fsdata->src->read_block(fsdata->src, block,
data->data.content);
@ -655,7 +655,7 @@ IsoFilesystem* ifs_get_filesystem(IsoFileSource *src)
}
data = src->data;
return (IsoFilesystem*) data->fs;
return data->fs;
}
static
@ -674,7 +674,7 @@ void ifs_free(IsoFileSource *src)
if (S_ISLNK(data->info.st_mode)) {
free(data->data.content);
}
iso_filesystem_unref((IsoFilesystem*)data->fs);
iso_filesystem_unref(data->fs);
if (data->parent != NULL) {
iso_file_source_unref(data->parent);
}
@ -759,11 +759,11 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
uint32_t relocated_dir = 0;
if (fs == NULL || fs->fs.data == NULL || record == NULL || src == NULL) {
if (fs == NULL || fs->data == NULL || record == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
fsdata = (_ImageFsData*)fs->fs.data;
fsdata = (_ImageFsData*)fs->data;
memset(&atts, 0, sizeof(struct stat));
@ -1134,7 +1134,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
/* fill data */
ifsdata->fs = fs;
iso_filesystem_ref((IsoFilesystem*)fs);
iso_filesystem_ref(fs);
if (parent != NULL) {
ifsdata->parent = parent;
iso_file_source_ref(parent);
@ -1317,11 +1317,11 @@ int ifs_fs_open(IsoImageFilesystem *fs)
{
_ImageFsData *data;
if (fs == NULL || fs->fs.data == NULL) {
if (fs == NULL || fs->data == NULL) {
return ISO_NULL_POINTER;
}
data = (_ImageFsData*)fs->fs.data;
data = (_ImageFsData*)fs->data;
if (data->open_count == 0) {
/* we need to actually open the data source */
@ -1339,11 +1339,11 @@ int ifs_fs_close(IsoImageFilesystem *fs)
{
_ImageFsData *data;
if (fs == NULL || fs->fs.data == NULL) {
if (fs == NULL || fs->data == NULL) {
return ISO_NULL_POINTER;
}
data = (_ImageFsData*)fs->fs.data;
data = (_ImageFsData*)fs->data;
if (--data->open_count == 0) {
/* we need to actually close the data source */
@ -1663,15 +1663,14 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
goto fs_cleanup;
}
ifs->data = data;
ifs->refcount = 1;
ifs->get_root = ifs_get_root;
ifs->get_by_path = ifs_get_by_path;
ifs->get_id = ifs_get_id;
ifs->open = ifs_fs_open;
ifs->close = ifs_fs_close;
ifs->fs.data = data;
ifs->fs.refcount = 1;
ifs->fs.get_root = ifs_get_root;
ifs->fs.get_by_path = ifs_get_by_path;
ifs->fs.free = ifs_fs_free;
ifs->fs.get_id = ifs_get_id;
ifs->free = ifs_fs_free;
/* read Volume Descriptors and ensure it is a valid image */
@ -1829,7 +1828,7 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
return ISO_SUCCESS;
fs_cleanup: ;
ifs_fs_free((IsoFilesystem*)ifs);
ifs_fs_free(ifs);
free(ifs);
return ret;
}
@ -1863,7 +1862,7 @@ int image_builder_create_node(IsoNodeBuilder *builder, IsoImage *image,
case S_IFREG:
{
/* source is a regular file */
_ImageFsData *fsdata = data->fs->fs.data;
_ImageFsData *fsdata = data->fs->data;
if (fsdata->eltorito && data->block == fsdata->catblock) {
@ -2050,11 +2049,11 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoFileSource **src)
IsoFileSource *ifsrc = NULL;
ImageFileSourceData *ifsdata = NULL;
if (fs == NULL || fs->fs.data == NULL || src == NULL) {
if (fs == NULL || fs->data == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
fsdata = (_ImageFsData*)fs->fs.data;
fsdata = (_ImageFsData*)fs->data;
memset(&atts, 0, sizeof(struct stat));
atts.st_mode = S_IFREG;
@ -2088,7 +2087,7 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoFileSource **src)
/* fill data */
ifsdata->fs = fs;
iso_filesystem_ref((IsoFilesystem*)fs);
iso_filesystem_ref(fs);
ifsdata->parent = NULL;
ifsdata->info = atts;
ifsdata->name = NULL;
@ -2129,10 +2128,10 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
if (ret < 0) {
return ret;
}
data = fs->fs.data;
data = fs->data;
/* get root from filesystem */
ret = fs->fs.get_root((IsoFilesystem*)fs, &newroot);
ret = fs->get_root(fs, &newroot);
if (ret < 0) {
return ret;
}
@ -2151,7 +2150,7 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
goto import_revert;
}
image->fs = (IsoFilesystem*)fs;
image->fs = fs;
/* create new root, and set root attributes from source */
ret = iso_node_new_root(&image->root);
@ -2280,62 +2279,62 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
iso_file_source_unref(newroot);
fs->close(fs);
iso_filesystem_unref((IsoFilesystem*)fs);
iso_filesystem_unref(fs);
return ret;
}
const char *iso_image_fs_get_volset_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->volset_id;
}
const char *iso_image_fs_get_volume_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->volume_id;
}
const char *iso_image_fs_get_publisher_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->publisher_id;
}
const char *iso_image_fs_get_data_preparer_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->data_preparer_id;
}
const char *iso_image_fs_get_system_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->system_id;
}
const char *iso_image_fs_get_application_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->application_id;
}
const char *iso_image_fs_get_copyright_file_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->copyright_file_id;
}
const char *iso_image_fs_get_abstract_file_id(IsoImageFilesystem *fs)
{
_ImageFsData *data;
data = (_ImageFsData*) fs->fs.data;
data = (_ImageFsData*) fs->data;
return data->abstract_file_id;
}
const char *iso_image_fs_get_biblio_file_id(IsoImageFilesystem *fs)
{
_ImageFsData *data = (_ImageFsData*) fs->fs.data;
_ImageFsData *data = (_ImageFsData*) fs->data;
return data->biblio_file_id;
}

36
src/fs_image.h
View File

@ -12,36 +12,14 @@
#include "libisofs.h"
#include "fsource.h"
/**
* IsoFilesystem implementation to deal with ISO images, and to offer a way to
* access specific information of the image, such as several volume attributes,
* extensions being used, El-Torito artifacts...
*/
struct libiso_msgs;
typedef struct Iso_Image_Filesystem IsoImageFilesystem;
/**
* Extends IsoFilesystem interface, to offer a way to access specific
* information of the image, such as several volume attributes, extensions
* being used, El-Torito artifacts...
*/
struct Iso_Image_Filesystem
{
IsoFilesystem fs;
/*
* TODO both open and close have meaning to other filesystems, in fact
* they seem useful for any kind of Filesystems, with the exception of
* the local filesystem. Thus, we should consider adding them to
* IsoFilesystem interface
*/
/**
* Opens the filesystem for several read operations. Calling this funcion
* is not needed at all, each time that the underlying IsoDataSource need
* to be read, it is openned propertly. However, if you plan to execute
* several operations on the image, it is a good idea to open it
* previously, to prevent several open/close operations.
*/
int (*open)(IsoImageFilesystem *fs);
int (*close)(IsoImageFilesystem *fs);
};
typedef IsoFilesystem IsoImageFilesystem;
int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
int msgid, IsoImageFilesystem **fs);

16
src/fs_local.c
View File

@ -592,6 +592,20 @@ unsigned int lfs_get_id(IsoFilesystem *fs)
return ISO_LOCAL_FS_ID;
}
static
int lfs_fs_open(IsoFilesystem *fs)
{
/* open() operation is not needed */
return ISO_SUCCESS;
}
static
int lfs_fs_close(IsoFilesystem *fs)
{
/* close() operation is not needed */
return ISO_SUCCESS;
}
static
void lfs_fs_free(IsoFilesystem *fs)
{
@ -620,6 +634,8 @@ int iso_local_filesystem_new(IsoFilesystem **fs)
lfs->get_root = lfs_get_root;
lfs->get_by_path = lfs_get_by_path;
lfs->get_id = lfs_get_id;
lfs->open = lfs_fs_open;
lfs->close = lfs_fs_close;
lfs->free = lfs_fs_free;
}
*fs = lfs;

47
src/fsource.h
View File

@ -32,10 +32,28 @@ typedef struct Iso_Filesystem IsoFilesystem;
*/
extern unsigned int iso_fs_global_id;
/**
* An IsoFilesystem is a handler for a source of files, or a "filesystem".
* That is defined as a set of files that are organized in a hierarchical
* structure.
*
* A filesystem allows libisofs to access files from several sources in
* an homogeneous way, thus abstracting the underlying operations needed to
* access and read file contents. Note that this doesn't need to be tied
* to the disc filesystem used in the partition being accessed. For example,
* we have an IsoFilesystem implementation to access any mounted filesystem,
* using standard Linux functions. It is also legal, of course, to implement
* an IsoFilesystem to deal with a specific filesystem over raw partitions.
* That is what we do, for example, to access an ISO Image.
*
* Each file inside an IsoFilesystem is represented as an IsoFileSource object,
* that defines POSIX-like interface for accessing files.
*/
struct Iso_Filesystem
{
/**
* Get the root of a filesystem.
*
* @return
* 1 on success, < 0 on error
@ -43,6 +61,7 @@ struct Iso_Filesystem
int (*get_root)(IsoFilesystem *fs, IsoFileSource **root);
/**
* Retrieve a file from its absolute path inside the filesystem.
*
* @return
* 1 success, < 0 error
@ -72,10 +91,34 @@ struct Iso_Filesystem
*/
unsigned int (*get_id)(IsoFilesystem *fs);
/**
* Opens the filesystem for several read operations. Calling this funcion
* is not needed at all, each time that the underlying system resource
* needs to be accessed, it is openned propertly.
* However, if you plan to execute several operations on the filesystem,
* it is a good idea to open it previously, to prevent several open/close
* operations to occur.
*
* @return 1 on success, < 0 on error
*/
int (*open)(IsoFilesystem *fs);
/**
* Close the filesystem, thus freeing all system resources. You should
* call this function if you have previously open() it.
* Note that you can open()/close() a filesystem several times.
*
* @return 1 on success, < 0 on error
*/
int (*close)(IsoFilesystem *fs);
/**
* Free implementation specific data. Should never be called by user.
* Use iso_filesystem_unref() instead.
*/
void (*free)(IsoFilesystem *fs);
/* TODO each file will take a ref to IsoFilesystem, so maybe a 64bits
* integer is a better choose for this */
/* internal usage, do never access them directly */
unsigned int refcount;
void *data;
};