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libisofs/src/ecma119.c

452 lines
12 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 "libisofs.h"
#include "ecma119.h"
#include "ecma119_tree.h"
#include "error.h"
#include "filesrc.h"
#include "image.h"
#include "writer.h"
#include "util.h"
#include "libburn/libburn.h"
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
static
void ecma119_image_free(Ecma119Image *t)
{
size_t i;
ecma119_node_free(t->root);
iso_image_unref(t->image);
iso_rbtree_destroy(t->files, iso_file_src_free);
for (i = 0; i < t->nwriters; ++i) {
IsoImageWriter *writer = t->writers[i];
writer->free_data(writer);
free(writer);
}
free(t->input_charset);
free(t->writers);
free(t);
}
/**
* Compute the size of a directory entry for a single node
*/
static
size_t calc_dirent_len(Ecma119Node *n)
{
int ret = n->iso_name ? strlen(n->iso_name) + 33 : 34;
if (ret % 2) ret++;
return ret;
}
/**
* Computes the total size of all directory entries of a single dir,
* acording to ECMA-119 6.8.1.1
*/
static
size_t calc_dir_size(Ecma119Image *t, Ecma119Node *dir)
{
size_t i, len;
t->ndirs++;
/* size of "." and ".." entries */
len = 34 + 34;
for (i = 0; i < dir->info.dir.nchildren; ++i) {
Ecma119Node *child = dir->info.dir.children[i];
size_t dirent_len = calc_dirent_len(child);
size_t 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;
}
}
return len;
}
static
void calc_dir_pos(Ecma119Image *t, Ecma119Node *dir)
{
size_t i, len;
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++) {
Ecma119Node *child = dir->info.dir.children[i];
if (child->type == ECMA119_DIR) {
calc_dir_pos(t, child);
}
}
}
static
int ecma119_writer_compute_data_blocks(IsoImageWriter *writer)
{
Ecma119Image *target;
Ecma119Node **pathlist;
uint32_t path_table_size;
size_t i, j, cur;
if (writer == NULL) {
return ISO_MEM_ERROR;
}
target = writer->target;
/* compute position of directories */
target->ndirs = 0;
calc_dir_pos(target, target->root);
/* compute length of pathlist */
pathlist = calloc(1, sizeof(void*) * target->ndirs);
if (pathlist == NULL) {
return ISO_MEM_ERROR;
}
pathlist[0] = target->root;
path_table_size = 10; /* root directory record */
cur = 1;
for (i = 0; i < target->ndirs; i++) {
Ecma119Node *dir = pathlist[i];
for (j = 0; j < dir->info.dir.nchildren; j++) {
Ecma119Node *child = dir->info.dir.children[j];
if (child->type == ECMA119_DIR) {
size_t len = 8 + strlen(child->iso_name);
pathlist[cur++] = child;
path_table_size += len + len % 2;
}
}
}
/* compute location for path tables */
target->l_path_table_pos = target->curblock;
target->curblock += div_up(path_table_size, BLOCK_SIZE);
target->m_path_table_pos = target->curblock;
target->curblock += div_up(path_table_size, BLOCK_SIZE);
target->path_table_size = path_table_size;
/* ...and free path table cache, as we do not need it at all */
free(pathlist);
return ISO_SUCCESS;
}
/**
* Write the Primary Volume Descriptor
*/
static
int ecma119_writer_write_vol_desc(IsoImageWriter *writer)
{
IsoImage *image;
Ecma119Image *t;
struct ecma119_pri_vol_desc vol;
char *vol_id, *pub_id, *data_id, *volset_id;
char *system_id, *application_id, *copyright_file_id;
char *abstract_file_id, *biblio_file_id;
if (writer == NULL) {
return ISO_MEM_ERROR;
}
t = writer->target;
image = t->image;
memset(&vol, 0, sizeof(struct ecma119_pri_vol_desc));
str2d_char(image->volume_id, t->input_charset, &vol_id);
str2a_char(image->publisher_id, t->input_charset, &pub_id);
str2a_char(image->data_preparer_id, t->input_charset, &data_id);
str2d_char(image->volset_id, t->input_charset, &volset_id);
str2a_char(image->system_id, t->input_charset, &system_id);
str2a_char(image->application_id, t->input_charset, &application_id);
str2d_char(image->copyright_file_id, t->input_charset, &copyright_file_id);
str2d_char(image->abstract_file_id, t->input_charset, &abstract_file_id);
str2d_char(image->biblio_file_id, t->input_charset, &biblio_file_id);
vol.vol_desc_type[0] = 1;
memcpy(vol.std_identifier, "CD001", 5);
vol.vol_desc_version[0] = 1;
if (system_id)
strncpy((char*)vol.system_id, system_id, 32);
else
/* put linux by default? */
memcpy(vol.system_id, "LINUX", 5);
if (vol_id)
strncpy((char*)vol.volume_id, vol_id, 32);
iso_bb(vol.vol_space_size, t->vol_space_size, 4);
iso_bb(vol.vol_set_size, 1, 2);
iso_bb(vol.vol_seq_number, 1, 2);
iso_bb(vol.block_size, BLOCK_SIZE, 2);
iso_bb(vol.path_table_size, t->path_table_size, 4);
iso_lsb(vol.l_path_table_pos, t->l_path_table_pos, 4);
iso_msb(vol.m_path_table_pos, t->m_path_table_pos, 4);
//TODO
//write_one_dir_record(t, t->root, 3, vol->root_dir_record);
if (volset_id)
strncpy((char*)vol.vol_set_id, volset_id, 128);
if (pub_id)
strncpy((char*)vol.publisher_id, pub_id, 128);
if (data_id)
strncpy((char*)vol.data_prep_id, data_id, 128);
if (application_id)
strncpy((char*)vol.application_id, application_id, 128);
if (copyright_file_id)
strncpy((char*)vol.copyright_file_id, copyright_file_id, 37);
if (abstract_file_id)
strncpy((char*)vol.abstract_file_id, abstract_file_id, 37);
if (biblio_file_id)
strncpy((char*)vol.bibliographic_file_id, biblio_file_id, 37);
iso_datetime_17(vol.vol_creation_time, t->now);
iso_datetime_17(vol.vol_modification_time, t->now);
iso_datetime_17(vol.vol_effective_time, t->now);
vol.file_structure_version[0] = 1;
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_pri_vol_desc));
}
static
int ecma119_writer_write_data(IsoImageWriter *writer)
{
//TODO to implement
return -1;
}
static
int ecma119_writer_free_data(IsoImageWriter *writer)
{
//TODO to implement
return -1;
}
int ecma119_writer_create(Ecma119Image *target)
{
int ret;
IsoImageWriter *writer;
writer = malloc(sizeof(IsoImageWriter));
if (writer == NULL) {
return ISO_MEM_ERROR;
}
writer->compute_data_blocks = ecma119_writer_compute_data_blocks;
writer->write_vol_desc = ecma119_writer_write_vol_desc;
writer->write_data = ecma119_writer_write_data;
writer->free_data = ecma119_writer_free_data;
writer->data = NULL;
writer->target = target;
/* add this writer to image */
target->writers[target->nwriters++] = writer;
ret = ecma119_tree_create(target);
if (ret < 0) {
return ret;
}
/* we need the volume descriptor */
target->curblock++;
return ISO_SUCCESS;
}
static
int ecma119_image_new(IsoImage *src, Ecma119WriteOpts *opts,
Ecma119Image **img)
{
int ret, i;
Ecma119Image *target;
/* 1. Allocate target and copy opts there */
target = calloc(1, sizeof(Ecma119Image));
if (target == NULL) {
return ISO_MEM_ERROR;
}
/* create the tree for file caching */
ret = iso_rbtree_new(iso_file_src_cmp, &(target->files));
if (ret < 0) {
free(target);
return ret;
}
target->image = src;
iso_image_ref(src);
target->iso_level = opts->level;
target->sort_files = opts->sort_files;
target->now = time(NULL);
target->ms_block = 0;
target->input_charset = strdup("UTF-8"); //TODO
/*
* 2. Based on those options, create needed writers: iso, joliet...
* Each writer inits its structures and stores needed info into
* target.
* If the writer needs an volume descriptor, it increments image
* current block.
* Finally, create Writer for files.
*/
target->curblock = target->ms_block + 16;
/* the number of writers is dependent of the extensions */
target->writers = malloc(2 * sizeof(void*));
if (target->writers == NULL) {
iso_image_unref(src);
free(target);
return ISO_MEM_ERROR;
}
/* create writer for ECMA-119 structure */
ret = ecma119_writer_create(target);
if (ret < 0) {
goto target_cleanup;
}
/* Volume Descriptor Set Terminator */
target->curblock++;
/* create writer for file contents */
ret = iso_file_src_writer_create(target);
if (ret < 0) {
goto target_cleanup;
}
/*
* 3.
* Call compute_data_blocks() in each Writer.
* That function computes the size needed by its structures and
* increments image current block propertly.
*/
for (i = 0; i < target->nwriters; ++i) {
IsoImageWriter *writer = target->writers[i];
ret = writer->compute_data_blocks(writer);
if (ret < 0) {
goto target_cleanup;
}
}
/*
* The volume space size is just the size of the last session, in
* case of ms images.
*/
target->total_size = (target->curblock - target->ms_block) * BLOCK_SIZE;
target->vol_space_size = target->curblock - target->ms_block;
/* 4. Start writting thread */
*img = target;
return ISO_SUCCESS;
target_cleanup:;
ecma119_image_free(target);
return ret;
}
static int
bs_read(struct burn_source *bs, unsigned char *buf, int size)
{
// TODO to implement
return 0;
}
static off_t
bs_get_size(struct burn_source *bs)
{
Ecma119Image *image = (Ecma119Image*)bs->data;
return image->total_size;
}
static void
bs_free_data(struct burn_source *bs)
{
ecma119_image_free((Ecma119Image*)bs->data);
}
static
int bs_set_size(struct burn_source *bs, off_t size)
{
//TODO to implement!!
// struct ecma119_write_target *t = (struct ecma119_write_target*)bs->data;
// t->total_size = size;
return 1;
}
int iso_image_create(IsoImage *image, Ecma119WriteOpts *opts,
struct burn_source **burn_src)
{
int ret;
struct burn_source *source;
Ecma119Image *target = NULL;
if (image == NULL || opts == NULL || burn_src == NULL) {
return ISO_NULL_POINTER;
}
source = calloc(1, sizeof(struct burn_source));
if (source == NULL) {
return ISO_MEM_ERROR;
}
ret = ecma119_image_new(image, opts, &target);
if (ret < 0) {
free(source);
return ret;
}
source->refcount = 1;
source->read = bs_read;
source->get_size = bs_get_size;
source->set_size = bs_set_size;
source->free_data = bs_free_data;
source->data = target;
return ISO_SUCCESS;
}
int iso_write(Ecma119Image *target, void *buf, size_t count)
{
ssize_t result;
result = write(target->wrfd, buf, count);
if (result != count) {
/* treat this as an error? */
return ISO_WRITE_ERROR;
} else {
return ISO_SUCCESS;
}
}