libburnia/libisofs
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
34e35865fe
libisofs/libisofs/iso1999.c

1074 lines
30 KiB
C
Raw Blame History

/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2011-2014 Thomas Schmitt
*
* 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
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include "iso1999.h"
#include "messages.h"
#include "writer.h"
#include "image.h"
#include "filesrc.h"
#include "eltorito.h"
#include "util.h"
#include "ecma119.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static
int get_iso1999_name(Ecma119Image *t, const char *str, char **fname)
{
int ret;
char *name;
if (fname == NULL) {
return ISO_ASSERT_FAILURE;
}
if (str == NULL) {
/* not an error, can be root node */
*fname = NULL;
return ISO_SUCCESS;
}
if (!strcmp(t->input_charset, t->output_charset)) {
/* no conversion needed */
name = strdup(str);
} else {
ret = strconv(str, t->input_charset, t->output_charset, &name);
if (ret < 0) {
ret = iso_msg_submit(t->image->id, ISO_FILENAME_WRONG_CHARSET, ret,
"Charset conversion error. Can't convert %s from %s to %s",
str, t->input_charset, t->output_charset);
if (ret < 0) {
return ret; /* aborted */
}
/* use the original name, it's the best we can do */
name = strdup(str);
}
}
/* ISO 9660:1999 7.5.1 */
if (strlen(name) > 207) {
name[207] = '\0';
}
*fname = name;
return ISO_SUCCESS;
}
static
void iso1999_node_free(Iso1999Node *node)
{
if (node == NULL) {
return;
}
if (node->type == ISO1999_DIR) {
size_t i;
for (i = 0; i < node->info.dir->nchildren; i++) {
iso1999_node_free(node->info.dir->children[i]);
}
if (node->info.dir->children != NULL)
free(node->info.dir->children);
free(node->info.dir);
}
iso_node_unref(node->node);
free(node->name);
free(node);
}
/**
* Create a low level ISO 9660:1999 node
* @return
* 1 success, 0 ignored, < 0 error
*/
static
int create_node(Ecma119Image *t, IsoNode *iso, Iso1999Node **node)
{
int ret;
Iso1999Node *n;
n = calloc(1, sizeof(Iso1999Node));
if (n == NULL) {
return ISO_OUT_OF_MEM;
}
if (iso->type == LIBISO_DIR) {
IsoDir *dir = (IsoDir*) iso;
n->info.dir = calloc(1, sizeof(struct iso1999_dir_info));
if (n->info.dir == NULL) {
free(n);
return ISO_OUT_OF_MEM;
}
n->info.dir->children = NULL;
if (dir->nchildren > 0) {
n->info.dir->children = calloc(sizeof(void*), dir->nchildren);
if (n->info.dir->children == NULL) {
free(n->info.dir);
free(n);
return ISO_OUT_OF_MEM;
}
}
n->type = ISO1999_DIR;
} else if (iso->type == LIBISO_FILE) {
/* it's a file */
off_t size;
IsoFileSrc *src;
IsoFile *file = (IsoFile*) iso;
size = iso_stream_get_size(file->stream);
if (size > (off_t)MAX_ISO_FILE_SECTION_SIZE && t->opts->iso_level != 3) {
char *ipath = iso_tree_get_node_path(iso);
ret = iso_msg_submit(t->image->id, ISO_FILE_TOO_BIG, 0,
"File \"%s\" can't be added to image because is "
"greater than 4GB", ipath);
free(n);
free(ipath);
return ret;
}
ret = iso_file_src_create(t, file, &src);
if (ret < 0) {
free(n);
return ret;
}
n->info.file = src;
n->type = ISO1999_FILE;
} else if (iso->type == LIBISO_BOOT) {
/* it's a el-torito boot catalog, that we write as a file */
IsoFileSrc *src;
ret = el_torito_catalog_file_src_create(t, &src);
if (ret < 0) {
free(n);
return ret;
}
n->info.file = src;
n->type = ISO1999_FILE;
} else {
/* should never happen */
free(n);
return ISO_ASSERT_FAILURE;
}
/* take a ref to the IsoNode */
n->node = iso;
iso_node_ref(iso);
*node = n;
return ISO_SUCCESS;
}
/**
* Create the low level ISO 9660:1999 tree from the high level ISO tree.
*
* @return
* 1 success, 0 file ignored, < 0 error
*/
static
int create_tree(Ecma119Image *t, IsoNode *iso, Iso1999Node **tree, int pathlen)
{
int ret, max_path;
Iso1999Node *node = NULL;
char *iso_name = NULL;
if (t == NULL || iso == NULL || tree == NULL) {
return ISO_NULL_POINTER;
}
if (iso->hidden & LIBISO_HIDE_ON_1999) {
/* file will be ignored */
return 0;
}
ret = get_iso1999_name(t, iso->name, &iso_name);
if (ret < 0) {
return ret;
}
max_path = pathlen + 1 + (iso_name ? strlen(iso_name): 0);
if (!t->opts->allow_longer_paths && max_path > 255) {
char *ipath = iso_tree_get_node_path(iso);
ret = iso_msg_submit(t->image->id, ISO_FILE_IMGPATH_WRONG, 0,
"File \"%s\" can't be added to ISO 9660:1999 tree, "
"because its path length is larger than 255", ipath);
free(iso_name);
free(ipath);
return ret;
}
switch (iso->type) {
case LIBISO_FILE:
ret = create_node(t, iso, &node);
break;
case LIBISO_DIR:
{
IsoNode *pos;
IsoDir *dir = (IsoDir*)iso;
ret = create_node(t, iso, &node);
if (ret < 0) {
free(iso_name);
return ret;
}
pos = dir->children;
while (pos) {
int cret;
Iso1999Node *child;
cret = create_tree(t, pos, &child, max_path);
if (cret < 0) {
/* error */
iso1999_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;
case LIBISO_BOOT:
if (t->eltorito) {
ret = create_node(t, iso, &node);
} else {
/* log and ignore */
ret = iso_msg_submit(t->image->id, ISO_FILE_IGNORED, 0,
"El-Torito catalog found on a image without El-Torito.");
}
break;
case LIBISO_SYMLINK:
case LIBISO_SPECIAL:
{
char *ipath = iso_tree_get_node_path(iso);
ret = iso_msg_submit(t->image->id, ISO_FILE_IGNORED, 0,
"Can't add %s to ISO 9660:1999 tree. This kind of files "
"can only be added to a Rock Ridget tree. Skipping.",
ipath);
free(ipath);
}
break;
default:
/* should never happen */
return ISO_ASSERT_FAILURE;
}
if (ret <= 0) {
free(iso_name);
return ret;
}
node->name = iso_name;
*tree = node;
return ISO_SUCCESS;
}
static int
cmp_node(const void *f1, const void *f2)
{
Iso1999Node *f = *((Iso1999Node**)f1);
Iso1999Node *g = *((Iso1999Node**)f2);
/**
* TODO #00027 Follow ISO 9660:1999 specs when sorting files
* strcmp do not does exactly what ISO 9660:1999, 9.3, as characters
* < 0x20 " " are allowed, so name len must be taken into accout
*/
return strcmp(f->name, g->name);
}
/**
* Sort the entries inside an ISO 9660:1999 directory, according to
* ISO 9660:1999, 9.3
*/
static
void sort_tree(Iso1999Node *root)
{
size_t i;
if (root->info.dir->children == NULL)
return;
qsort(root->info.dir->children, root->info.dir->nchildren,
sizeof(void*), cmp_node);
for (i = 0; i < root->info.dir->nchildren; i++) {
Iso1999Node *child = root->info.dir->children[i];
if (child->type == ISO1999_DIR)
sort_tree(child);
}
}
static
int mangle_single_dir(Ecma119Image *img, Iso1999Node *dir)
{
int ret;
int i, nchildren;
Iso1999Node **children;
IsoHTable *table = NULL;
int need_sort = 0;
char *full_name = NULL, *tmp = NULL;
nchildren = dir->info.dir->nchildren;
if (nchildren <= 0) {
ret = ISO_SUCCESS;
goto ex;
}
children = dir->info.dir->children;
LIBISO_ALLOC_MEM(full_name, char, 208);
LIBISO_ALLOC_MEM(tmp, char, 208);
/* a hash table will temporary hold the names, for fast searching */
ret = iso_htable_create((nchildren * 100) / 80, iso_str_hash,
(compare_function_t)strcmp, &table);
if (ret < 0) {
goto ex;
}
for (i = 0; i < nchildren; ++i) {
char *name = children[i]->name;
ret = iso_htable_add(table, name, name);
if (ret < 0) {
goto ex;
}
}
for (i = 0; i < nchildren; ++i) {
char *name, *ext;
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(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.
*/
while (digits < 8) {
int ok, k;
char *dot;
int change = 0; /* number to be written */
/* copy name to buffer */
strcpy(full_name, children[i]->name);
/* compute name and extension */
dot = strrchr(full_name, '.');
if (dot != NULL && children[i]->type != ISO1999_DIR) {
/*
* File (not dir) with extension.
*/
int extlen;
full_name[dot - full_name] = '\0';
name = full_name;
ext = dot + 1;
extlen = strlen(ext);
max = 207 - 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 = 207 - extlen - 1 - digits;
} else {
/*
* error, we don't support extensions < 3
* This can't happen with current limit of digits.
*/
ret = ISO_ERROR;
goto ex;
}
}
/* ok, reduce name by digits */
if (name + max < dot) {
name[max] = '\0';
}
} else {
/* Directory, or file without extension */
if (children[i]->type == ISO1999_DIR) {
dot = NULL; /* dots have no meaning in dirs */
}
max = 207 - digits;
name = full_name;
if ((size_t) 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 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 (!iso_htable_get(table, tmp, NULL)) {
/* the name is unique, so it can be used */
break;
}
}
if (ok) {
char *new = strdup(tmp);
if (new == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
iso_msg_debug(img->image->id, "\"%s\" renamed to \"%s\"",
children[k]->name, new);
iso_htable_remove_ptr(table, children[k]->name, NULL);
free(children[k]->name);
children[k]->name = new;
iso_htable_add(table, new, 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) {
ret = ISO_MANGLE_TOO_MUCH_FILES;
goto ex;
}
i = j;
}
/*
* If needed, sort again the files inside dir
*/
if (need_sort) {
qsort(children, nchildren, sizeof(void*), cmp_node);
}
ret = ISO_SUCCESS;
ex:;
iso_htable_destroy(table, NULL);
LIBISO_FREE_MEM(tmp);
LIBISO_FREE_MEM(full_name);
return ret;
}
static
int mangle_tree(Ecma119Image *t, Iso1999Node *dir)
{
int ret;
size_t i;
ret = mangle_single_dir(t, dir);
if (ret < 0) {
return ret;
}
/* recurse */
for (i = 0; i < dir->info.dir->nchildren; ++i) {
if (dir->info.dir->children[i]->type == ISO1999_DIR) {
ret = mangle_tree(t, dir->info.dir->children[i]);
if (ret < 0) {
/* error */
return ret;
}
}
}
return ISO_SUCCESS;
}
static
int iso1999_tree_create(Ecma119Image *t)
{
int ret;
Iso1999Node *root;
if (t == NULL) {
return ISO_NULL_POINTER;
}
ret = create_tree(t, (IsoNode*)t->image->root, &root, 0);
if (ret <= 0) {
if (ret == 0) {
/* unexpected error, root ignored!! This can't happen */
ret = ISO_ASSERT_FAILURE;
}
return ret;
}
/* the ISO 9660:1999 tree is stored in Ecma119Image target */
t->iso1999_root = root;
iso_msg_debug(t->image->id, "Sorting the ISO 9660:1999 tree...");
sort_tree(root);
iso_msg_debug(t->image->id, "Mangling ISO 9660:1999 names...");
ret = mangle_tree(t, t->iso1999_root);
if (ret < 0) {
return ret;
}
return ISO_SUCCESS;
}
/**
* Compute the size of a directory entry for a single node
*/
static
size_t calc_dirent_len(Ecma119Image *t, Iso1999Node *n)
{
int ret = n->name ? strlen(n->name) + 33 : 34;
if (ret % 2)
ret++;
return ret;
}
/**
* Computes the total size of all directory entries of a single dir, as
* stated in ISO 9660:1999, 6.8.1.3
*/
static
size_t calc_dir_size(Ecma119Image *t, Iso1999Node *dir)
{
size_t i, len;
/* size of "." and ".." entries */
len = 34 + 34;
for (i = 0; i < dir->info.dir->nchildren; ++i) {
size_t remaining;
int section, nsections;
Iso1999Node *child = dir->info.dir->children[i];
size_t dirent_len = calc_dirent_len(t, child);
nsections = (child->type == ISO1999_FILE) ? child->info.file->nsections : 1;
for (section = 0; section < nsections; ++section) {
remaining = BLOCK_SIZE - (len % BLOCK_SIZE);
if (dirent_len > remaining) {
/* child directory entry doesn't fit on block */
len += remaining + dirent_len;
} else {
len += dirent_len;
}
}
}
/*
* The size of a dir is always a multiple of block size, as we must add
* the size of the unused space after the last directory record
* (ISO 9660:1999, 6.8.1.3)
*/
len = ROUND_UP(len, BLOCK_SIZE);
/* cache the len */
dir->info.dir->len = len;
return len;
}
static
void calc_dir_pos(Ecma119Image *t, Iso1999Node *dir)
{
size_t i, len;
t->iso1999_ndirs++;
dir->info.dir->block = t->curblock;
len = calc_dir_size(t, dir);
t->curblock += DIV_UP(len, BLOCK_SIZE);
for (i = 0; i < dir->info.dir->nchildren; i++) {
Iso1999Node *child = dir->info.dir->children[i];
if (child->type == ISO1999_DIR) {
calc_dir_pos(t, child);
}
}
}
/**
* Compute the length of the path table (ISO 9660:1999, 6.9), in bytes.
*/
static
uint32_t calc_path_table_size(Iso1999Node *dir)
{
uint32_t size;
size_t i;
/* size of path table for this entry */
size = 8;
size += dir->name ? strlen(dir->name) : 2;
size += (size % 2);
/* and recurse */
for (i = 0; i < dir->info.dir->nchildren; i++) {
Iso1999Node *child = dir->info.dir->children[i];
if (child->type == ISO1999_DIR) {
size += calc_path_table_size(child);
}
}
return size;
}
static
int iso1999_writer_compute_data_blocks(IsoImageWriter *writer)
{
Ecma119Image *t;
uint32_t path_table_size;
if (writer == NULL) {
return ISO_OUT_OF_MEM;
}
t = writer->target;
/* compute position of directories */
iso_msg_debug(t->image->id,
"Computing position of ISO 9660:1999 dir structure");
t->iso1999_ndirs = 0;
calc_dir_pos(t, t->iso1999_root);
/* compute length of pathlist */
iso_msg_debug(t->image->id, "Computing length of ISO 9660:1999 pathlist");
path_table_size = calc_path_table_size(t->iso1999_root);
/* compute location for path tables */
t->iso1999_l_path_table_pos = t->curblock;
t->curblock += DIV_UP(path_table_size, BLOCK_SIZE);
t->iso1999_m_path_table_pos = t->curblock;
t->curblock += DIV_UP(path_table_size, BLOCK_SIZE);
t->iso1999_path_table_size = path_table_size;
return ISO_SUCCESS;
}
/**
* Write a single directory record (ISO 9660:1999, 9.1).
*
* @param file_id
* if >= 0, we use it instead of the filename (for "." and ".." entries).
* @param len_fi
* Computed length of the file identifier.
*/
static
void write_one_dir_record(Ecma119Image *t, Iso1999Node *node, int file_id,
uint8_t *buf, size_t len_fi, int extent)
{
uint32_t len;
uint32_t block;
uint8_t len_dr; /*< size of dir entry */
int multi_extend = 0;
uint8_t *name = (file_id >= 0) ? (uint8_t*)&file_id
: (uint8_t*)node->name;
struct ecma119_dir_record *rec = (struct ecma119_dir_record*)buf;
IsoNode *iso;
len_dr = 33 + len_fi + ((len_fi % 2) ? 0 : 1);
memcpy(rec->file_id, name, len_fi);
if (node->type == ISO1999_DIR) {
/* use the cached length */
len = node->info.dir->len;
block = node->info.dir->block;
} else if (node->type == ISO1999_FILE) {
block = node->info.file->sections[extent].block;
len = node->info.file->sections[extent].size;
multi_extend = (node->info.file->nsections - 1 == extent) ? 0 : 1;
} else {
/*
* for nodes other than files and dirs, we set both
* len and block to 0
*/
len = 0;
block = 0;
}
/*
* For ".." entry we need to write the parent info!
*/
if (file_id == 1 && node->parent)
node = node->parent;
rec->len_dr[0] = len_dr;
iso_bb(rec->block, block, 4);
iso_bb(rec->length, len, 4);
/* was: iso_datetime_7(rec->recording_time, t->now, t->opts->always_gmt);
*/
iso= node->node;
iso_datetime_7(rec->recording_time,
(t->opts->dir_rec_mtime & 4) ? ( t->replace_timestamps ?
t->timestamp : iso->mtime )
: t->now, t->opts->always_gmt);
rec->flags[0] = ((node->type == ISO1999_DIR) ? 2 : 0) | (multi_extend ? 0x80 : 0);
iso_bb(rec->vol_seq_number, (uint32_t) 1, 2);
rec->len_fi[0] = len_fi;
}
/**
* Write the enhanced volume descriptor (ISO/IEC 9660:1999, 8.5)
*/
static
int iso1999_writer_write_vol_desc(IsoImageWriter *writer)
{
IsoImage *image;
Ecma119Image *t;
/* The enhanced volume descriptor is like the sup vol desc */
struct ecma119_sup_vol_desc vol;
char *vol_id = NULL, *pub_id = NULL, *data_id = NULL;
char *volset_id = NULL, *system_id = NULL, *application_id = NULL;
char *copyright_file_id = NULL, *abstract_file_id = NULL;
char *biblio_file_id = NULL;
if (writer == NULL) {
return ISO_OUT_OF_MEM;
}
t = writer->target;
image = t->image;
iso_msg_debug(image->id, "Write Enhanced Vol Desc (ISO 9660:1999)");
memset(&vol, 0, sizeof(struct ecma119_sup_vol_desc));
get_iso1999_name(t, image->volume_id, &vol_id);
str2a_char(t->input_charset, image->publisher_id, &pub_id);
str2a_char(t->input_charset, image->data_preparer_id, &data_id);
get_iso1999_name(t, image->volset_id, &volset_id);
str2a_char(t->input_charset, image->system_id, &system_id);
str2a_char(t->input_charset, image->application_id, &application_id);
get_iso1999_name(t, image->copyright_file_id, &copyright_file_id);
get_iso1999_name(t, image->abstract_file_id, &abstract_file_id);
get_iso1999_name(t, image->biblio_file_id, &biblio_file_id);
vol.vol_desc_type[0] = 2;
memcpy(vol.std_identifier, "CD001", 5);
/* descriptor version is 2 (ISO/IEC 9660:1999, 8.5.2) */
vol.vol_desc_version[0] = 2;
strncpy_pad((char*)vol.volume_id, vol_id, 32);
iso_bb(vol.vol_space_size, t->vol_space_size, 4);
iso_bb(vol.vol_set_size, (uint32_t) 1, 2);
iso_bb(vol.vol_seq_number, (uint32_t) 1, 2);
iso_bb(vol.block_size, (uint32_t) BLOCK_SIZE, 2);
iso_bb(vol.path_table_size, t->iso1999_path_table_size, 4);
iso_lsb(vol.l_path_table_pos, t->iso1999_l_path_table_pos, 4);
iso_msb(vol.m_path_table_pos, t->iso1999_m_path_table_pos, 4);
write_one_dir_record(t, t->iso1999_root, 0, vol.root_dir_record, 1, 0);
strncpy_pad((char*)vol.vol_set_id, volset_id, 128);
strncpy_pad((char*)vol.publisher_id, pub_id, 128);
strncpy_pad((char*)vol.data_prep_id, data_id, 128);
strncpy_pad((char*)vol.system_id, system_id, 32);
strncpy_pad((char*)vol.application_id, application_id, 128);
strncpy_pad((char*)vol.copyright_file_id, copyright_file_id, 37);
strncpy_pad((char*)vol.abstract_file_id, abstract_file_id, 37);
strncpy_pad((char*)vol.bibliographic_file_id, biblio_file_id, 37);
ecma119_set_voldescr_times(writer, (struct ecma119_pri_vol_desc *) &vol);
vol.file_structure_version[0] = 2;
free(vol_id);
free(volset_id);
free(pub_id);
free(data_id);
free(system_id);
free(application_id);
free(copyright_file_id);
free(abstract_file_id);
free(biblio_file_id);
/* Finally write the Volume Descriptor */
return iso_write(t, &vol, sizeof(struct ecma119_sup_vol_desc));
}
static
int write_one_dir(Ecma119Image *t, Iso1999Node *dir)
{
int ret;
uint8_t *buffer = NULL;
size_t i;
size_t fi_len, len;
/* buf will point to current write position on buffer */
uint8_t *buf;
LIBISO_ALLOC_MEM(buffer, uint8_t, BLOCK_SIZE);
buf = buffer;
/* write the "." and ".." entries first */
write_one_dir_record(t, dir, 0, buf, 1, 0);
buf += 34;
write_one_dir_record(t, dir, 1, buf, 1, 0);
buf += 34;
for (i = 0; i < dir->info.dir->nchildren; i++) {
int section, nsections;
Iso1999Node *child = dir->info.dir->children[i];
/* compute len of directory entry */
fi_len = strlen(child->name);
len = fi_len + 33 + ((fi_len % 2) ? 0 : 1);
nsections = (child->type == ISO1999_FILE) ? child->info.file->nsections : 1;
for (section = 0; section < nsections; ++section) {
if ( (buf + len - buffer) > BLOCK_SIZE) {
/* dir doesn't fit in current block */
ret = iso_write(t, buffer, BLOCK_SIZE);
if (ret < 0) {
goto ex;
}
memset(buffer, 0, BLOCK_SIZE);
buf = buffer;
}
/* write the directory entry in any case */
write_one_dir_record(t, child, -1, buf, fi_len, section);
buf += len;
}
}
/* write the last block */
ret = iso_write(t, buffer, BLOCK_SIZE);
ex:;
LIBISO_FREE_MEM(buffer);
return ret;
}
static
int write_dirs(Ecma119Image *t, Iso1999Node *root)
{
int ret;
size_t i;
/* write all directory entries for this dir */
ret = write_one_dir(t, root);
if (ret < 0) {
return ret;
}
/* recurse */
for (i = 0; i < root->info.dir->nchildren; i++) {
Iso1999Node *child = root->info.dir->children[i];
if (child->type == ISO1999_DIR) {
ret = write_dirs(t, child);
if (ret < 0) {
return ret;
}
}
}
return ISO_SUCCESS;
}
static
int write_path_table(Ecma119Image *t, Iso1999Node **pathlist, int l_type)
{
size_t i, len;
uint8_t *buf = NULL;
struct ecma119_path_table_record *rec;
void (*write_int)(uint8_t*, uint32_t, int);
Iso1999Node *dir;
uint32_t path_table_size;
int parent = 0;
int ret= ISO_SUCCESS;
uint8_t *zeros = NULL;
/* 256 is just a convenient size large enought */
LIBISO_ALLOC_MEM(buf, uint8_t, 256);
path_table_size = 0;
write_int = l_type ? iso_lsb : iso_msb;
for (i = 0; i < t->iso1999_ndirs; i++) {
dir = pathlist[i];
/* find the index of the parent in the table */
while ((i) && pathlist[parent] != dir->parent) {
parent++;
}
/* write the Path Table Record (ECMA-119, 9.4) */
memset(buf, 0, 256);
rec = (struct ecma119_path_table_record*) buf;
rec->len_di[0] = dir->parent ? (uint8_t) strlen(dir->name) : 1;
rec->len_xa[0] = 0;
write_int(rec->block, dir->info.dir->block, 4);
write_int(rec->parent, parent + 1, 2);
if (dir->parent) {
memcpy(rec->dir_id, dir->name, rec->len_di[0]);
}
len = 8 + rec->len_di[0] + (rec->len_di[0] % 2);
ret = iso_write(t, buf, len);
if (ret < 0) {
/* error */
goto ex;
}
path_table_size += len;
}
/* we need to fill the last block with zeros */
path_table_size %= BLOCK_SIZE;
if (path_table_size) {
LIBISO_ALLOC_MEM(zeros, uint8_t, BLOCK_SIZE);
len = BLOCK_SIZE - path_table_size;
memset(zeros, 0, len);
ret = iso_write(t, zeros, len);
}
ex:;
LIBISO_FREE_MEM(zeros);
LIBISO_FREE_MEM(buf);
return ret;
}
static
int write_path_tables(Ecma119Image *t)
{
int ret;
size_t i, j, cur;
Iso1999Node **pathlist;
iso_msg_debug(t->image->id, "Writing ISO 9660:1999 Path tables");
/* allocate temporal pathlist */
pathlist = malloc(sizeof(void*) * t->iso1999_ndirs);
if (pathlist == NULL) {
return ISO_OUT_OF_MEM;
}
pathlist[0] = t->iso1999_root;
cur = 1;
for (i = 0; i < t->iso1999_ndirs; i++) {
Iso1999Node *dir = pathlist[i];
for (j = 0; j < dir->info.dir->nchildren; j++) {
Iso1999Node *child = dir->info.dir->children[j];
if (child->type == ISO1999_DIR) {
pathlist[cur++] = child;
}
}
}
/* Write L Path Table */
ret = write_path_table(t, pathlist, 1);
if (ret < 0) {
goto write_path_tables_exit;
}
/* Write L Path Table */
ret = write_path_table(t, pathlist, 0);
write_path_tables_exit: ;
free(pathlist);
return ret;
}
static
int iso1999_writer_write_data(IsoImageWriter *writer)
{
int ret;
Ecma119Image *t;
if (writer == NULL) {
return ISO_NULL_POINTER;
}
t = writer->target;
/* first of all, we write the directory structure */
ret = write_dirs(t, t->iso1999_root);
if (ret < 0) {
return ret;
}
/* and write the path tables */
ret = write_path_tables(t);
return ret;
}
static
int iso1999_writer_free_data(IsoImageWriter *writer)
{
/* free the ISO 9660:1999 tree */
Ecma119Image *t = writer->target;
iso1999_node_free(t->iso1999_root);
return ISO_SUCCESS;
}
int iso1999_writer_create(Ecma119Image *target)
{
int ret;
IsoImageWriter *writer;
writer = malloc(sizeof(IsoImageWriter));
if (writer == NULL) {
return ISO_OUT_OF_MEM;
}
writer->compute_data_blocks = iso1999_writer_compute_data_blocks;
writer->write_vol_desc = iso1999_writer_write_vol_desc;
writer->write_data = iso1999_writer_write_data;
writer->free_data = iso1999_writer_free_data;
writer->data = NULL;
writer->target = target;
iso_msg_debug(target->image->id,
"Creating low level ISO 9660:1999 tree...");
ret = iso1999_tree_create(target);
if (ret < 0) {
free((char *) writer);
return ret;
}
/* add this writer to image */
target->writers[target->nwriters++] = writer;
/* we need the volume descriptor */
target->curblock++;
return ISO_SUCCESS;
}
Reference in New Issue View Git Blame Copy Permalink