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libisofs/src/ecma119_tree.c

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/*
* 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 "ecma119_tree.h"
#include "ecma119.h"
#include "error.h"
#include "node.h"
#include "util.h"
#include "filesrc.h"
#include "messages.h"
#include "image.h"
#include "stream.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static
int get_iso_name(Ecma119Image *img, IsoNode *iso, char **name)
{
int ret;
char *ascii_name;
char *isoname= NULL;
if (iso->name == NULL) {
/* it is not necessarily an error, it can be the root */
return ISO_SUCCESS;
}
ret = str2ascii(img->input_charset, iso->name, &ascii_name);
if (ret < 0) {
iso_msg_debug(img->image->messenger, "Can't convert %s", iso->name);
return ret;
}
// TODO add support for relaxed constraints
if (iso->type == LIBISO_DIR) {
if (img->iso_level == 1) {
isoname = iso_1_dirid(ascii_name);
} else {
isoname = iso_2_dirid(ascii_name);
}
} else {
if (img->iso_level == 1) {
isoname = iso_1_fileid(ascii_name);
} else {
isoname = iso_2_fileid(ascii_name);
}
}
free(ascii_name);
if (isoname != NULL) {
*name = isoname;
return ISO_SUCCESS;
} else {
/*
* only possible if mem error, as check for empty names is done
* in public tree
*/
return ISO_MEM_ERROR;
}
}
static
int create_ecma119_node(Ecma119Image *img, IsoNode *iso, Ecma119Node **node)
{
Ecma119Node *ecma;
ecma = calloc(1, sizeof(Ecma119Node));
if (ecma == NULL) {
return ISO_MEM_ERROR;
}
/* take a ref to the IsoNode */
ecma->node = iso;
iso_node_ref(iso);
// TODO better handling of this, add support for harlinks
ecma->nlink = 1;
ecma->ino = ++img->ino;
*node = ecma;
return ISO_SUCCESS;
}
/**
* Create a new ECMA-119 node representing a directory from a iso directory
* node.
*/
static
int create_dir(Ecma119Image *img, IsoDir *iso, Ecma119Node **node)
{
int ret;
Ecma119Node **children;
struct ecma119_dir_info *dir_info;
children = calloc(1, sizeof(void*) * iso->nchildren);
if (children == NULL) {
return ISO_MEM_ERROR;
}
dir_info = calloc(1, sizeof(struct ecma119_dir_info));
if (dir_info == NULL) {
free(children);
return ISO_MEM_ERROR;
}
ret = create_ecma119_node(img, (IsoNode*)iso, node);
if (ret < 0) {
free(children);
free(dir_info);
return ret;
}
(*node)->type = ECMA119_DIR;
(*node)->info.dir = dir_info;
(*node)->info.dir->nchildren = 0;
(*node)->info.dir->children = children;
return ISO_SUCCESS;
}
/**
* Create a new ECMA-119 node representing a regular file from a iso file
* node.
*/
static
int create_file(Ecma119Image *img, IsoFile *iso, Ecma119Node **node)
{
int ret;
IsoFileSrc *src;
off_t size;
size = iso_stream_get_size(iso->stream);
if (size > (off_t)0xffffffff) {
iso_msg_note(img->image->messenger, LIBISO_FILE_IGNORED,
"File \"%s\" can't be added to image because is "
"greater than 4GB", iso->node.name);
return 0;
}
ret = iso_file_src_create(img, iso, &src);
if (ret < 0) {
return ret;
}
ret = create_ecma119_node(img, (IsoNode*)iso, node);
if (ret < 0) {
/*
* the src doesn't need to be freed, it is free together with
* the Ecma119Image
*/
return ret;
}
(*node)->type = ECMA119_FILE;
(*node)->info.file = src;
return ret;
}
/**
* Create a new ECMA-119 node representing a symbolic link from a iso symlink
* node.
*/
static
int create_symlink(Ecma119Image *img, IsoSymlink *iso, Ecma119Node **node)
{
int ret;
ret = create_ecma119_node(img, (IsoNode*)iso, node);
if (ret < 0) {
return ret;
}
(*node)->type = ECMA119_SYMLINK;
return ISO_SUCCESS;
}
/**
* Create a new ECMA-119 node representing a special file.
*/
static
int create_special(Ecma119Image *img, IsoSpecial *iso, Ecma119Node **node)
{
int ret;
ret = create_ecma119_node(img, (IsoNode*)iso, node);
if (ret < 0) {
return ret;
}
(*node)->type = ECMA119_SPECIAL;
return ISO_SUCCESS;
}
void ecma119_node_free(Ecma119Node *node)
{
if (node == NULL) {
return;
}
if (node->type == ECMA119_DIR) {
int i;
for (i = 0; i < node->info.dir->nchildren; i++) {
ecma119_node_free(node->info.dir->children[i]);
}
free(node->info.dir->children);
free(node->info.dir);
}
free(node->iso_name);
iso_node_unref(node->node);
free(node);
}
/**
*
* @return
* 1 success, 0 node ignored, < 0 error
*
*/
static
int create_tree(Ecma119Image *image, IsoNode *iso, Ecma119Node **tree,
int depth, int pathlen)
{
int ret;
Ecma119Node *node;
int max_path;
char *iso_name= NULL;
if (image == NULL || iso == NULL || tree == NULL) {
return ISO_NULL_POINTER;
}
if (iso->hidden & LIBISO_HIDE_ON_RR) {
/* file will be ignored */
return 0;
}
ret = get_iso_name(image, iso, &iso_name);
if (ret < 0) {
return ret;
}
max_path = pathlen + 1 + (iso_name ? strlen(iso_name) : 0);
if (!image->rockridge && !image->allow_deep_paths) {
if ((iso->type == LIBISO_DIR && depth > 8) || max_path > 255) {
iso_msg_note(image->image->messenger, LIBISO_FILE_IGNORED,
"File \"%s\" can't be added, because depth > 8 "
"or path length over 255", iso->name);
free(iso_name);
return 0;
}
}
switch (iso->type) {
case LIBISO_FILE:
ret = create_file(image, (IsoFile*)iso, &node);
break;
case LIBISO_SYMLINK:
if (image->rockridge) {
ret = create_symlink(image, (IsoSymlink*)iso, &node);
} else {
/* symlinks are only supported when RR is enabled */
iso_msg_note(image->image->messenger, LIBISO_FILE_IGNORED,
"File \"%s\" ignored. Symlinks need RockRidge extensions.",
iso->name);
ret = 0;
}
break;
case LIBISO_SPECIAL:
if (image->rockridge) {
ret = create_special(image, (IsoSpecial*)iso, &node);
} else {
/* symlinks are only supported when RR is enabled */
iso_msg_note(image->image->messenger, LIBISO_FILE_IGNORED,
"File \"%s\" ignored. Special files need RockRidge extensions.",
iso->name);
ret = 0;
}
break;
case LIBISO_BOOT:
//TODO
free(iso_name);
return 0;
break;
case LIBISO_DIR:
{
IsoNode *pos;
IsoDir *dir = (IsoDir*)iso;
ret = create_dir(image, dir, &node);
if (ret < 0) {
return ret;
}
pos = dir->children;
while (pos) {
int cret;
Ecma119Node *child;
cret = create_tree(image, pos, &child, depth + 1, max_path);
if (cret < 0) {
/* error */
ecma119_node_free(node);
ret = cret;
break;
} else if (cret == ISO_SUCCESS) {
/* add child to this node */
int nchildren = node->info.dir->nchildren++;
node->info.dir->children[nchildren] = child;
child->parent = node;
}
pos = pos->next;
}
}
break;
default:
/* should never happen */
return ISO_ERROR;
}
if (ret <= 0) {
free(iso_name);
return ret;
}
node->iso_name = iso_name;
*tree = node;
return ISO_SUCCESS;
}
/**
* Compare the iso name of two ECMA-119 nodes
*/
static
int cmp_node_name(const void *f1, const void *f2)
{
Ecma119Node *f = *((Ecma119Node**)f1);
Ecma119Node *g = *((Ecma119Node**)f2);
return strcmp(f->iso_name, g->iso_name);
}
/**
* Sorts a the children of each directory in the ECMA-119 tree represented
* by \p root, acording to the order specified in ECMA-119, section 9.3.
*/
static
void sort_tree(Ecma119Node *root)
{
size_t i;
qsort(root->info.dir->children, root->info.dir->nchildren, sizeof(void*),
cmp_node_name);
for (i = 0; i < root->info.dir->nchildren; i++) {
if (root->info.dir->children[i]->type == ECMA119_DIR)
sort_tree(root->info.dir->children[i]);
}
}
static
int contains_name(Ecma119Node *dir, const char *name)
{
int i;
for (i = 0; i < dir->info.dir->nchildren; i++) {
Ecma119Node *child = dir->info.dir->children[i];
if (!strcmp(child->iso_name, name)) {
return 1;
}
}
return 0;
}
/**
* Ensures that the ISO name of each children of the given dir is unique,
* changing some of them if needed.
* It also ensures that resulting filename is always <= than given
* max_name_len, including extension. If needed, the extension will be reduced,
* but never under 3 characters.
*/
static
int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
int max_dir_len)
{
int i, nchildren;
Ecma119Node **children;
int need_sort = 0;
nchildren = dir->info.dir->nchildren;
children = dir->info.dir->children;
for (i = 0; i < nchildren; ++i) {
char *name, *ext;
char full_name[40];
int max; /* computed max len for name, without extension */
int j = i;
int digits = 1; /* characters to change per name */
/* first, find all child with same name */
while (j + 1 < nchildren && !cmp_node_name(children + i, children + j
+ 1)) {
++j;
}
if (j == i) {
/* name is unique */
continue;
}
/*
* A max of 7 characters is good enought, it allows handling up to
* 9,999,999 files with same name. We can increment this to
* max_name_len, but the int_pow() function must then be modified
* to return a bigger integer.
*/
while (digits < 8) {
int ok, k;
char *dot;
int change = 0; /* number to be written */
/* copy name to buffer */
strcpy(full_name, children[i]->iso_name);
/* compute name and extension */
dot = strrchr(full_name, '.');
if (dot != NULL && children[i]->type != ECMA119_DIR) {
/*
* File (not dir) with extension
* Note that we don't need to check for placeholders, as
* tree reparent happens later, so no placeholders can be
* here at this time.
*/
int extlen;
full_name[dot - full_name] = '\0';
name = full_name;
ext = dot + 1;
/*
* For iso level 1 we force ext len to be 3, as name
* can't grow on the extension space
*/
extlen = (max_file_len == 12) ? 3 : strlen(ext);
max = max_file_len - extlen - 1 - digits;
if (max <= 0) {
/* this can happen if extension is too long */
if (extlen + max > 3) {
/*
* reduce extension len, to give name an extra char
* note that max is negative or 0
*/
extlen = extlen + max - 1;
ext[extlen] = '\0';
max = max_file_len - extlen - 1 - digits;
} else {
/*
* error, we don't support extensions < 3
* This can't happen with current limit of digits.
*/
return ISO_ERROR;
}
}
/* ok, reduce name by digits */
if (name + max < dot) {
name[max] = '\0';
}
} else {
/* Directory, or file without extension */
if (children[i]->type == ECMA119_DIR) {
max = max_dir_len - digits;
dot = NULL; /* dots have no meaning in dirs */
} else {
max = max_file_len - digits;
}
name = full_name;
if (max < strlen(name)) {
name[max] = '\0';
}
/* let ext be an empty string */
ext = name + strlen(name);
}
ok = 1;
/* change name of each file */
for (k = i; k <= j; ++k) {
char tmp[40];
char fmt[16];
if (dot != NULL) {
sprintf(fmt, "%%s%%0%dd.%%s", digits);
} else {
sprintf(fmt, "%%s%%0%dd%%s", digits);
}
while (1) {
sprintf(tmp, fmt, name, change, ext);
++change;
if (change > int_pow(10, digits)) {
ok = 0;
break;
}
if (!contains_name(dir, tmp)) {
/* the name is unique, so it can be used */
break;
}
}
if (ok) {
char *new = strdup(tmp);
if (new == NULL) {
return ISO_MEM_ERROR;
}
iso_msg_debug(img->image->messenger,
"\"%s\" renamed to \"%s\"",
children[k]->iso_name, new);
free(children[k]->iso_name);
children[k]->iso_name = new;
/*
* if we change a name we need to sort again children
* at the end
*/
need_sort = 1;
} else {
/* we need to increment digits */
break;
}
}
if (ok) {
break;
} else {
++digits;
}
}
if (digits == 8) {
return ISO_MANGLE_TOO_MUCH_FILES;
}
i = j;
}
/*
* If needed, sort again the files inside dir
*/
if (need_sort) {
qsort(children, nchildren, sizeof(void*), cmp_node_name);
}
return ISO_SUCCESS;
}
static
int mangle_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
int max_dir_len)
{
int ret;
size_t i;
ret = mangle_single_dir(img, dir, max_file_len, max_dir_len);
if (ret < 0) {
return ret;
}
/* recurse */
for (i = 0; i < dir->info.dir->nchildren; ++i) {
if (dir->info.dir->children[i]->type == ECMA119_DIR) {
ret = mangle_dir(img, dir->info.dir->children[i], max_file_len,
max_dir_len);
if (ret < 0) {
/* error */
return ret;
}
}
}
return ISO_SUCCESS;
}
static
int mangle_tree(Ecma119Image *img, int recurse)
{
int max_file, max_dir;
// TODO take care about relaxed constraints
if (img->iso_level == 1) {
max_file = 12; /* 8 + 3 + 1 */
max_dir = 8;
} else {
max_file = max_dir = 31;
}
if (recurse) {
return mangle_dir(img, img->root, max_file, max_dir);
} else {
return mangle_single_dir(img, img->root, max_file, max_dir);
}
}
/**
* Create a new ECMA-119 node representing a placeholder for a relocated
* dir.
*
* See IEEE P1282, section 4.1.5 for details
*/
static
int create_placeholder(Ecma119Node *parent, Ecma119Node *real,
Ecma119Node **node)
{
Ecma119Node *ret;
ret = calloc(1, sizeof(Ecma119Node));
if (ret == NULL) {
return ISO_MEM_ERROR;
}
/*
* TODO
* If real is a dir, while placeholder is a file, ISO name restricctions
* are different, what to do?
*/
ret->iso_name = strdup(real->iso_name);
if (ret->iso_name == NULL) {
free(ret);
return ISO_MEM_ERROR;
}
/* take a ref to the IsoNode */
ret->node = real->node;
iso_node_ref(real->node);
ret->parent = parent;
ret->type = ECMA119_PLACEHOLDER;
ret->info.real_me = real;
ret->ino = real->ino;
ret->nlink = real->nlink;
*node = ret;
return ISO_SUCCESS;
}
static
size_t max_child_name_len(Ecma119Node *dir)
{
size_t ret = 0, i;
for (i = 0; i < dir->info.dir->nchildren; i++) {
size_t len = strlen(dir->info.dir->children[i]->iso_name);
ret = MAX(ret, len);
}
return ret;
}
/**
* Relocates a directory, as specified in Rock Ridge Specification
* (see IEEE P1282, section 4.1.5). This is needed when the number of levels
* on a directory hierarchy exceeds 8, or the length of a path is higher
* than 255 characters, as specified in ECMA-119, section 6.8.2.1
*/
static
int reparent(Ecma119Node *child, Ecma119Node *parent)
{
int ret;
size_t i;
Ecma119Node *placeholder;
/* replace the child in the original parent with a placeholder */
for (i = 0; i < child->parent->info.dir->nchildren; i++) {
if (child->parent->info.dir->children[i] == child) {
ret = create_placeholder(child->parent, child, &placeholder);
if (ret < 0) {
return ret;
}
child->parent->info.dir->children[i] = placeholder;
break;
}
}
/* just for debug, this should never happen... */
if (i == child->parent->info.dir->nchildren) {
return ISO_ERROR;
}
/* keep track of the real parent */
child->info.dir->real_parent = child->parent;
/* add the child to its new parent */
child->parent = parent;
parent->info.dir->nchildren++;
parent->info.dir->children = realloc(parent->info.dir->children,
sizeof(void*) * parent->info.dir->nchildren);
parent->info.dir->children[parent->info.dir->nchildren - 1] = child;
return ISO_SUCCESS;
}
/**
* Reorder the tree, if necessary, to ensure that
* - the depth is at most 8
* - each path length is at most 255 characters
* This restriction is imposed by ECMA-119 specification (ECMA-119, 6.8.2.1).
*
* @param dir
* Dir we are currently processing
* @param level
* Level of the directory in the hierarchy
* @param pathlen
* Length of the path until dir, including it
* @return
* 1 success, < 0 error
*/
static
int reorder_tree(Ecma119Image *img, Ecma119Node *dir, int level, int pathlen)
{
int ret;
size_t max_path;
max_path = pathlen + 1 + max_child_name_len(dir);
if (level > 8 || max_path > 255) {
ret = reparent(dir, img->root);
if (ret < 0) {
return ret;
}
/*
* we are appended to the root's children now, so there is no
* need to recurse (the root will hit us again)
*/
} else {
size_t i;
for (i = 0; i < dir->info.dir->nchildren; i++) {
Ecma119Node *child = dir->info.dir->children[i];
if (child->type == ECMA119_DIR) {
int newpathlen = pathlen + 1 + strlen(child->iso_name);
ret = reorder_tree(img, child, level + 1, newpathlen);
if (ret < 0) {
return ret;
}
}
}
}
return ISO_SUCCESS;
}
int ecma119_tree_create(Ecma119Image *img)
{
int ret;
Ecma119Node *root;
ret = create_tree(img, (IsoNode*)img->image->root, &root, 1, 0);
if (ret <= 0) {
if (ret == 0) {
/* unexpected error, root ignored!! This can't happen */
ret = ISO_ERROR;
}
return ret;
}
img->root = root;
iso_msg_debug(img->image->messenger, "Sorting the low level tree...");
sort_tree(root);
iso_msg_debug(img->image->messenger, "Mangling names...");
ret = mangle_tree(img, 1);
if (ret < 0) {
return ret;
}
if (img->rockridge && !img->allow_deep_paths) {
/* reorder the tree, acording to RRIP, 4.1.5 */
ret = reorder_tree(img, img->root, 1, 0);
if (ret < 0) {
return ret;
}
/*
* and we need to remangle the root directory, as the function
* above could insert new directories into the root.
* Note that recurse = 0, as we don't need to recurse.
*/
ret = mangle_tree(img, 0);
if (ret < 0) {
return ret;
}
}
return ISO_SUCCESS;
}
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