/* * 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 "iso1999.h" #include "messages.h" #include "writer.h" #include "image.h" #include "filesrc.h" #include "eltorito.h" #include #include #include 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) { int i; for (i = 0; i < node->info.dir->nchildren; i++) { iso1999_node_free(node->info.dir->children[i]); } 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 = 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)0xffffffff) { free(n); return iso_msg_submit(t->image->id, ISO_FILE_TOO_BIG, 0, "File \"%s\" can't be added to image because is " "greater than 4GB", iso->name); return 0; } 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->allow_longer_paths && max_path > 255) { free(iso_name); return 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", iso->name); } 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.", iso->name); } break; case LIBISO_SYMLINK: case LIBISO_SPECIAL: 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.", iso->name); 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; 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; int need_sort = 0; nchildren = dir->info.dir->nchildren; children = dir->info.dir->children; /* 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) { return ret; } for (i = 0; i < nchildren; ++i) { char *name = children[i]->name; ret = iso_htable_add(table, name, name); if (ret < 0) { goto mangle_cleanup; } } for (i = 0; i < nchildren; ++i) { char *name, *ext; char full_name[208]; 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 mangle_cleanup; } } /* 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 (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[208]; 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 mangle_cleanup; } 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 mangle_cleanup; } i = j; } /* * If needed, sort again the files inside dir */ if (need_sort) { qsort(children, nchildren, sizeof(void*), cmp_node); } ret = ISO_SUCCESS; mangle_cleanup : ; iso_htable_destroy(table, NULL); 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; Iso1999Node *child = dir->info.dir->children[i]; size_t dirent_len = calc_dirent_len(t, child); 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) { uint32_t len; uint32_t block; uint8_t len_dr; /*< size of dir entry */ uint8_t *name = (file_id >= 0) ? (uint8_t*)&file_id : (uint8_t*)node->name; struct ecma119_dir_record *rec = (struct ecma119_dir_record*)buf; 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) { len = iso_file_src_get_size(node->info.file); block = node->info.file->block; } 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); iso_datetime_7(rec->recording_time, t->now, t->always_gmt); rec->flags[0] = (node->type == ISO1999_DIR) ? 2 : 0; iso_bb(rec->vol_seq_number, 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, ©right_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, 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->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); 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); iso_datetime_17(vol.vol_creation_time, t->now, t->always_gmt); iso_datetime_17(vol.vol_modification_time, t->now, t->always_gmt); iso_datetime_17(vol.vol_effective_time, t->now, t->always_gmt); 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_sup_vol_desc)); } static int write_one_dir(Ecma119Image *t, Iso1999Node *dir) { int ret; uint8_t buffer[BLOCK_SIZE]; size_t i; size_t fi_len, len; /* buf will point to current write position on buffer */ uint8_t *buf = buffer; /* initialize buffer with 0s */ memset(buffer, 0, BLOCK_SIZE); /* write the "." and ".." entries first */ write_one_dir_record(t, dir, 0, buf, 1); buf += 34; write_one_dir_record(t, dir, 1, buf, 1); buf += 34; for (i = 0; i < dir->info.dir->nchildren; i++) { 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); if ( (buf + len - buffer) > BLOCK_SIZE) { /* dir doesn't fit in current block */ ret = iso_write(t, buffer, BLOCK_SIZE); if (ret < 0) { return ret; } memset(buffer, 0, BLOCK_SIZE); buf = buffer; } /* write the directory entry in any case */ write_one_dir_record(t, child, -1, buf, fi_len); buf += len; } /* write the last block */ ret = iso_write(t, buffer, BLOCK_SIZE); 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[256]; /* 256 is just a convenient size larger enought */ 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; 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 */ return ret; } path_table_size += len; } /* we need to fill the last block with zeros */ path_table_size %= BLOCK_SIZE; if (path_table_size) { uint8_t zeros[BLOCK_SIZE]; len = BLOCK_SIZE - path_table_size; memset(zeros, 0, len); ret = iso_write(t, zeros, len); } 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) { return ret; } /* add this writer to image */ target->writers[target->nwriters++] = writer; /* we need the volume descriptor */ target->curblock++; return ISO_SUCCESS; }