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libisofs/src/filesrc.c

114 lines
2.9 KiB

/*
* 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.
*/
#include "filesrc.h"
#include "error.h"
#include "node.h"
#include <stdlib.h>
/* tdestroy is a GNU specific function */
#define __USE_GNU
#include <search.h>
static
int comp_iso_file_src(const void *n1, const void *n2)
{
const IsoFileSrc *f1, *f2;
f1 = (const IsoFileSrc *)n1;
f2 = (const IsoFileSrc *)n2;
if (f1->fs_id < f2->fs_id) {
return -1;
} else if (f1->fs_id > f2->fs_id) {
return 1;
} else {
/* files belong to the same fs */
if (f1->dev_id > f2->dev_id) {
return -1;
} else if (f1->dev_id < f2->dev_id) {
return 1;
} else {
/* files belong to same device in same fs */
return (f1->ino_id < f2->ino_id) ? -1 :
(f1->ino_id > f2->ino_id) ? 1 : 0;
}
}
}
int iso_file_src_create(Ecma119Image *img, IsoFile *file, IsoFileSrc **src)
{
int res;
IsoStream *stream;
IsoFileSrc *fsrc;
unsigned int fs_id;
dev_t dev_id;
ino_t ino_id;
off_t size;
if (img == NULL || file == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
stream = file->stream;
res = stream->get_id(stream, &fs_id, &dev_id, &ino_id);
if (res < 0) {
return res;
} else if (res == 0) {
// TODO this corresponds to Stream that cannot provide a valid id
// Not implemented for now
return ISO_ERROR;
} else {
IsoFileSrc **inserted;
size = stream->get_size(stream);
if (size == (off_t)-1) {
return ISO_FILE_ERROR;
}
fsrc = malloc(sizeof(IsoFileSrc));
if (fsrc == NULL) {
return ISO_MEM_ERROR;
}
/* fill key and other atts */
fsrc->fs_id = fs_id;
fsrc->dev_id = dev_id;
fsrc->ino_id = ino_id;
fsrc->prev_img = file->msblock ? 1 : 0;
fsrc->block = file->msblock;
fsrc->size = size;
fsrc->sort_weight = file->sort_weight;
fsrc->stream = file->stream;
/* insert the filesrc in the tree */
inserted = tsearch(fsrc, &(img->file_srcs), comp_iso_file_src);
if (inserted == NULL) {
free(fsrc);
return ISO_MEM_ERROR;
} else if (*inserted == fsrc) {
/* the file was inserted */
img->file_count++;
} else {
/* the file was already on the tree */
free(fsrc);
}
*src = *inserted;
}
return ISO_SUCCESS;
}
void free_node(void *nodep)
{
/* nothing to do */
}
void iso_file_src_free(Ecma119Image *img)
{
tdestroy(img->file_srcs, free_node);
}