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Add support for cut-out files.

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This commit is contained in:
Vreixo Formoso 2008-03-08 21:45:19 +01:00
parent bad03a9a2b
commit d455f9b540
6 changed files with 331 additions and 9 deletions
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5
libisofs/builder.c
View File

@ -52,12 +52,13 @@ int default_create_file(IsoNodeBuilder *builder, IsoImage *image,
if (ret < 0) {
return ret;
}
/* take a ref to the src, as stream has taken our ref */
iso_file_source_ref(src);
name = iso_file_source_get_name(src);
ret = iso_node_new_file(name, stream, &node);
if (ret < 0) {
/* the stream has taken our ref to src, so we need to add one */
iso_file_source_ref(src);
iso_stream_unref(stream);
free(name);
return ret;

3
libisofs/builder.h
View File

@ -34,8 +34,7 @@ struct Iso_Node_Builder
* In that case, if the implementation can't do the conversion, it
* should fail propertly.
*
* On sucess, the ref. to src will be owned by file, so you musn't
* unref it.
* Note that the src is never unref, so you need to free it.
*
* @return
* 1 on success, < 0 on error

46
libisofs/libisofs.h
View File

@ -2805,6 +2805,44 @@ int iso_tree_add_node(IsoImage *image, IsoDir *parent, const char *path,
int iso_tree_add_new_node(IsoImage *image, IsoDir *parent, const char *name,
const char *path, IsoNode **node);
/**
* Add a new node to the image tree, from an existing file, and with the
* given name, that must not exist on dir. The node will be cut-out to the
* submitted size, and its contents will be read from the given offset. This
* function is thus suitable for adding only a piece of a file to the image.
*
* @param image
* The image
* @param parent
* The directory in the image tree where the node will be added.
* @param name
* The name that the node will have on image.
* @param path
* The path of the file to add in the filesystem. For now only regular
* files and symlinks to regular files are supported.
* @param offset
* Offset on the given file from where to start reading data.
* @param size
* Max size of the file.
* @param node
* place where to store a pointer to the newly added file. No
* extra ref is addded, so you will need to call iso_node_ref() if you
* really need it. You can pass NULL in this parameter if you don't need
* the pointer.
* @return
* number of nodes in parent if success, < 0 otherwise
* Possible errors:
* ISO_NULL_POINTER, if image, parent or path are NULL
* ISO_NODE_NAME_NOT_UNIQUE, a node with same name already exists
* ISO_OUT_OF_MEM
*
* @since 0.6.4
*/
int iso_tree_add_new_cut_out_node(IsoImage *image, IsoDir *parent,
const char *name, const char *path,
off_t offset, off_t size,
IsoNode **node);
/**
* Add the contents of a dir to a given directory of the iso tree.
*
@ -3639,10 +3677,16 @@ void iso_stream_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
/**
* File path break specification constraints and will be ignored
* (HINT,MEDIUM, -141)
* (HINT,MEDIUM, -144)
*/
#define ISO_FILE_IMGPATH_WRONG 0xC020FF70
/**
* Offset greater than file size (FAILURE,HIGH, -145)
* @since 0.6.4
*/
#define ISO_FILE_OFFSET_TOO_BIG 0xE830FF6A
/** Charset conversion error (FAILURE,HIGH, -256) */
#define ISO_CHARSET_CONV_ERROR 0xE830FF00

190
libisofs/stream.c
View File

@ -17,6 +17,7 @@
ino_t serial_id = (ino_t)1;
ino_t mem_serial_id = (ino_t)1;
ino_t cut_out_serial_id = (ino_t)1;
typedef struct
{
@ -175,7 +176,7 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
return ISO_OUT_OF_MEM;
}
data = malloc(sizeof(FSrcStreamData));
if (str == NULL) {
if (data == NULL) {
free(str);
return ISO_OUT_OF_MEM;
}
@ -212,6 +213,193 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
return ISO_SUCCESS;
}
struct cut_out_stream
{
IsoFileSource *src;
/* key for file identification inside filesystem */
dev_t dev_id;
ino_t ino_id;
off_t offset; /**< offset where read begins */
off_t size; /**< size of this file */
off_t pos; /* position on the file for read */
};
static
int cut_out_open(IsoStream *stream)
{
int ret;
struct stat info;
IsoFileSource *src;
struct cut_out_stream *data;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = stream->data;
src = data->src;
ret = iso_file_source_stat(data->src, &info);
if (ret < 0) {
return ret;
}
ret = iso_file_source_open(src);
if (ret < 0) {
return ret;
}
{
off_t ret;
if (data->offset > info.st_size) {
/* file is smaller than expected */
ret = iso_file_source_lseek(src, info.st_size, 0);
} else {
ret = iso_file_source_lseek(src, data->offset, 0);
}
if (ret < 0) {
return (int) ret;
}
}
data->pos = 0;
if (data->offset + data->size > info.st_size) {
return 3; /* file smaller than expected */
} else {
return ISO_SUCCESS;
}
}
static
int cut_out_close(IsoStream *stream)
{
IsoFileSource *src;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
src = ((struct cut_out_stream*)stream->data)->src;
return iso_file_source_close(src);
}
static
off_t cut_out_get_size(IsoStream *stream)
{
struct cut_out_stream *data = stream->data;
return data->size;
}
static
int cut_out_read(IsoStream *stream, void *buf, size_t count)
{
struct cut_out_stream *data = stream->data;
count = (size_t)MIN(data->size - data->pos, count);
if (count == 0) {
return 0;
}
return iso_file_source_read(data->src, buf, count);
}
static
int cut_out_is_repeatable(IsoStream *stream)
{
/* reg files are always repeatable */
return 1;
}
static
void cut_out_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
ino_t *ino_id)
{
FSrcStreamData *data;
IsoFilesystem *fs;
data = (FSrcStreamData*)stream->data;
fs = iso_file_source_get_filesystem(data->src);
*fs_id = fs->get_id(fs);
*dev_id = data->dev_id;
*ino_id = data->ino_id;
}
static
void cut_out_free(IsoStream *stream)
{
struct cut_out_stream *data = stream->data;
iso_file_source_unref(data->src);
free(data);
}
IsoStreamIface cut_out_stream_class = {
0,
"cout",
cut_out_open,
cut_out_close,
cut_out_get_size,
cut_out_read,
cut_out_is_repeatable,
cut_out_get_id,
cut_out_free
};
int iso_cut_out_stream_new(IsoFileSource *src, off_t offset, off_t size,
IsoStream **stream)
{
int r;
struct stat info;
IsoStream *str;
struct cut_out_stream *data;
if (src == NULL || stream == NULL) {
return ISO_NULL_POINTER;
}
if (size == 0) {
return ISO_WRONG_ARG_VALUE;
}
r = iso_file_source_stat(src, &info);
if (r < 0) {
return r;
}
if (!S_ISREG(info.st_mode)) {
return ISO_WRONG_ARG_VALUE;
}
if (offset > info.st_size) {
return ISO_FILE_OFFSET_TOO_BIG;
}
/* check for read access to contents */
r = iso_file_source_access(src);
if (r < 0) {
return r;
}
str = malloc(sizeof(IsoStream));
if (str == NULL) {
return ISO_OUT_OF_MEM;
}
data = malloc(sizeof(struct cut_out_stream));
if (data == NULL) {
free(str);
return ISO_OUT_OF_MEM;
}
/* take a new ref to IsoFileSource */
data->src = src;
iso_file_source_ref(src);
data->offset = offset;
data->size = MIN(info.st_size - offset, size);
/* get the id numbers */
data->dev_id = (dev_t) 0;
data->ino_id = cut_out_serial_id++;
str->refcount = 1;
str->data = data;
str->class = &cut_out_stream_class;
*stream = str;
return ISO_SUCCESS;
}
typedef struct

10
libisofs/stream.h
View File

@ -33,6 +33,16 @@ void iso_stream_get_file_name(IsoStream *stream, char *name);
*/
int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream);
/**
* Create a new stream to read a chunk of an IsoFileSource..
* The stream will add a ref. to the IsoFileSource.
*
* @return
* 1 sucess, < 0 error
*/
int iso_cut_out_stream_new(IsoFileSource *src, off_t offset, off_t size,
IsoStream **stream);
/**
* Create a stream for reading from a arbitrary memory buffer.
* When the Stream refcount reach 0, the buffer is free(3).

86
libisofs/tree.c
View File

@ -582,13 +582,14 @@ int iso_tree_add_new_node(IsoImage *image, IsoDir *parent, const char *name,
}
result = image->builder->create_node(image->builder, image, file, &new);
if (result < 0) {
return result;
}
/* free the file */
iso_file_source_unref(file);
if (result < 0) {
return result;
}
result = iso_node_set_name(new, name);
if (result < 0) {
iso_node_unref(new);
@ -603,6 +604,85 @@ int iso_tree_add_new_node(IsoImage *image, IsoDir *parent, const char *name,
return iso_dir_insert(parent, new, pos, ISO_REPLACE_NEVER);
}
int iso_tree_add_new_cut_out_node(IsoImage *image, IsoDir *parent,
const char *name, const char *path,
off_t offset, off_t size,
IsoNode **node)
{
int result;
struct stat info;
IsoFilesystem *fs;
IsoFileSource *src;
IsoFile *new;
IsoNode **pos;
IsoStream *stream;
if (image == NULL || parent == NULL || name == NULL || path == NULL) {
return ISO_NULL_POINTER;
}
if (node) {
*node = NULL;
}
/* find place where to insert */
result = iso_dir_exists(parent, name, &pos);
if (result) {
/* a node with same name already exists */
return ISO_NODE_NAME_NOT_UNIQUE;
}
fs = image->fs;
result = fs->get_by_path(fs, path, &src);
if (result < 0) {
return result;
}
result = iso_file_source_stat(src, &info);
if (result < 0) {
iso_file_source_unref(src);
return result;
}
if (!S_ISREG(info.st_mode)) {
return ISO_WRONG_ARG_VALUE;
}
if (offset >= info.st_size) {
return ISO_WRONG_ARG_VALUE;
}
/* force regular file */
result = image->builder->create_file(image->builder, image, src, &new);
/* free the file */
iso_file_source_unref(src);
if (result < 0) {
return result;
}
/* replace file iso stream with a cut-out-stream */
result = iso_cut_out_stream_new(src, offset, size, &stream);
if (result < 0) {
iso_node_unref((IsoNode*)new);
return result;
}
iso_stream_unref(new->stream);
new->stream = stream;
result = iso_node_set_name((IsoNode*)new, name);
if (result < 0) {
iso_node_unref((IsoNode*)new);
return result;
}
if (node) {
*node = (IsoNode*)new;
}
/* finally, add node to parent */
return iso_dir_insert(parent, (IsoNode*)new, pos, ISO_REPLACE_NEVER);
}
static
int check_excludes(IsoImage *image, const char *path)
{