libburn/libisofs/writer.c

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2006-08-15 20:37:04 +00:00
/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
#include "writer.h"
#include "util.h"
#include "volume.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#define APPLICATION_ID "LIBBURN SUITE (C) 2006 M.DANIC/L.BIDDELL/A.NARAYANAN"
enum DirType {
DIR_TYPE_SELF,
DIR_TYPE_PARENT,
DIR_TYPE_NORMAL,
DIR_TYPE_ROOT /* the dir record in the volume descriptor */
};
enum SUSPType {
SUSP_TYPE_SP = 1 << 0,
SUSP_TYPE_CE = 1 << 1,
SUSP_TYPE_NM = 1 << 2
};
static int get_path_table_size(struct iso_tree_dir **ddir);
static void iso_next_state(struct iso_write_target *target);
static int iso_source_get_size(struct burn_source *src);
static void iso_source_free(struct burn_source *src);
static void iso_target_layout(struct iso_write_target *target);
static void iso_dir_layout(struct iso_write_target *target,
struct iso_tree_dir **dir);
static void iso_file_layout(struct iso_write_target *target,
struct iso_tree_dir **dir);
static int iso_write_system_area(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
static int iso_write_pri_volume(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
static int iso_write_volume_terminator(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
static int write_path_table_record(unsigned char *buffer,
struct iso_tree_dir **ddir, int *position,
int lsb);
static int write_path_table_records(unsigned char *buffer,
struct iso_tree_dir **ddir,
int level, int *position, int lsb);
static int iso_write_path_table(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err, int lsb);
static int iso_write_dir_record(struct iso_write_target *target,
unsigned char *buffer,
struct iso_tree_dir **dir, enum DirType type);
static int iso_write_file_record(struct iso_write_target *t,
unsigned char *buffer,
struct iso_tree_file **ffile,
enum DirType type);
static void iso_write_file_id(unsigned char *buf, int size,
struct iso_tree_file **f);
static struct iso_tree_dir **find_dir_at_block(struct iso_tree_dir **ddir,
int block);
static struct iso_tree_file **find_file_at_block(struct iso_tree_dir **ddir,
int block);
static void write_child_records(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err,
struct iso_tree_dir *dir);
static int iso_write_dir_records(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
static int get_directory_record_length(const char *isoname);
static int iso_write_er_area(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
static int copy_file_to_buffer(FILE * fd, unsigned char *buffer, int length);
static int iso_write_files(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err);
int get_path_table_size(struct iso_tree_dir **ddir)
{
const char *isoname;
int i, size = 0;
struct iso_tree_dir *dir = *ddir;
assert(dir);
isoname = iso_tree_dir_get_name(ddir, ISO_FILE_NAME_ISO);
if (isoname) {
/* a path table record is 8 bytes + the length of the
directory identifier */
size += (8 + strlen(isoname));
} else {
/* if iso_tree_dir_get_name is NULL, this is the root dir and
will have a path record of 10 bytes */
size += 10;
}
/* pad the field if the directory identifier is an odd number of
bytes */
if (size % 2)
++size;
for (i = 0; i < dir->nchildren; i++)
size += get_path_table_size(dir->children[i].me);
return size;
}
struct burn_source *iso_source_new(struct iso_volumeset *volumeset, int volume)
{
struct burn_source *src;
struct iso_write_target *t;
if (!volumeset)
return NULL;
if (volume >= volumeset->volumeset_size)
return NULL;
t = malloc(sizeof(struct iso_write_target));
iso_tree_sort(volumeset->root);
t->volset = volumeset;
t->volset->refcount++;
t->volume = volume;
t->now = time(NULL);
t->phys_sector_size = 2048;
iso_target_layout(t);
t->state = ISO_WRITE_BEFORE;
iso_next_state(t); /* prepare for the first state */
src = malloc(sizeof(struct burn_source));
src->refcount = 1;
src->free_data = iso_source_free;
src->read = iso_source_generate;
src->read_sub = NULL;
src->get_size = iso_source_get_size;
src->data = t;
return src;
}
void iso_source_free(struct burn_source *src)
{
struct iso_write_target *target = src->data;
assert(src->read == iso_source_generate &&
src->read_sub == NULL && src->get_size == iso_source_get_size);
iso_volumeset_free(target->volset);
free(target);
return;
}
static int get_susp_length(struct RRInfo *info, enum SUSPType fields)
{
int len = 0;
if (fields & SUSP_TYPE_SP)
len += 7;
if (fields & SUSP_TYPE_CE)
len += 28;
if (info->px[0] != 0)
len += info->px[2];
if (info->tf)
len += info->tf[2];
if (info->nm && (fields & SUSP_TYPE_NM))
len += info->nm[2];
return len;
}
int get_directory_record_length(const char *isoname)
{
int size;
/* size = the length of the filename + 33 bytes (9.1) */
size = 33 + strlen(isoname);
/* if size is odd, pad it with a single byte (9.1.12) */
if (size % 2)
++size;
return size;
}
/* fill in the 'logical_block' and 'size' values for each directory */
void iso_dir_layout(struct iso_write_target *target,
struct iso_tree_dir **ddir)
{
int i, length, sectors, rr;
const char *name;
struct iso_tree_dir *dir = *ddir;
rr = iso_volumeset_get_rr(target->volset);
/* Each directory record starts with a record pointing to itself
and another pointing to its parent; combined, they are 68 bytes.
If RR is in use, calculate the susp length as well. */
length = 68;
if (rr) {
/* if this is the root dir recored, we need to include the
length of the CE and SP fields */
if (ddir == target->volset->root) {
length += get_susp_length(&dir->rr, SUSP_TYPE_SP | SUSP_TYPE_CE);
length += get_susp_length(&dir->rr, 0);
} else {
length += get_susp_length(&dir->rr, 0);
length += get_susp_length(&dir->parent->rr, 0);
}
}
/* calculate the length of this directory */
name = iso_tree_dir_get_name(ddir, ISO_FILE_NAME_ISO);
if (name)
length += get_directory_record_length(name);
else
length += get_directory_record_length("");
if (rr)
length += get_susp_length(&dir->rr, SUSP_TYPE_NM);
for (i = 0; i < dir->nfiles; ++i) {
name = iso_tree_file_get_name(dir->files[i].me,
ISO_FILE_NAME_ISO);
length += get_directory_record_length(name);
if (rr)
length += get_susp_length(&dir->files[i].rr, SUSP_TYPE_NM);
}
for (i = 0; i < dir->nchildren; ++i) {
name = iso_tree_dir_get_name(dir->children[i].me,
ISO_FILE_NAME_ISO);
length += get_directory_record_length(name);
if (rr)
length += get_susp_length(&dir->children[i].rr, SUSP_TYPE_NM);
}
/* dir->size is the number of bytes needed to hold the directory
record for each file and subdirectory of 'dir', padded to use up
all of the bytes of a physical sector. */
sectors = length / target->phys_sector_size;
if (length % target->phys_sector_size)
sectors++;
dir->size = sectors * target->phys_sector_size;
dir->logical_block = target->logical_block;
target->logical_block += sectors;
/* now calculate the lengths of its children */
for (i = 0; i < dir->nchildren; ++i) {
iso_dir_layout(target, dir->children[i].me);
}
return;
}
/* fill in the 'logical_block' and 'size' values for each file */
void iso_file_layout(struct iso_write_target *target,
struct iso_tree_dir **ddir)
{
int i, sectors;
struct iso_tree_dir *dir = *ddir;
for (i = 0; i < dir->nfiles; ++i) {
dir->files[i].logical_block = target->logical_block;
sectors = dir->files[i].size / target->phys_sector_size;
if (dir->files[i].size % target->phys_sector_size)
sectors++;
/* ensure we move past this logical block if the file was empty */
else if (!dir->files[i].size)
sectors++;
target->logical_block += sectors;
}
for (i = 0; i < dir->nchildren; ++i)
iso_file_layout(target, dir->children[i].me);
return;
}
void iso_target_layout(struct iso_write_target *target)
{
/* logical block numbering starts at 1, not 0 */
target->logical_block = 1;
/* system area */
target->logical_block += 16;
/* primary volume descriptor */
target->logical_block++;
/* volume descriptor terminator */
target->logical_block++;
target->logical_block_size = 2048;
target->path_table_size = get_path_table_size(target->volset->root);
/* put a 1-block buffer before each path table */
target->l_path_table_pos = 19;
target->logical_block += 2;
target->total_size += 2 * target->phys_sector_size;
/* put a 1-block buffer before each path table */
target->m_path_table_pos = 21;
target->logical_block += 2;
iso_dir_layout(target, target->volset->root);
/* iso_write_dir_records() puts a 1-block buffer after the directory
section, so increment this accordingly */
target->logical_block++;
/* the ce area only takes up one block */
target->susp_er_pos = target->logical_block++;
iso_file_layout(target, target->volset->root);
target->volume_space_size = target->logical_block;
target->total_size = target->volume_space_size * target->phys_sector_size;
return;
}
int iso_source_get_size(struct burn_source *src)
{
struct iso_write_target *target = src->data;
assert(src->read == iso_source_generate &&
src->read_sub == NULL && src->get_size == iso_source_get_size);
return target->total_size;
}
void iso_next_state(struct iso_write_target *target)
{
switch (++target->state) {
case ISO_WRITE_BEFORE:
/* this should never occur */
assert(0);
break;
case ISO_WRITE_SYSTEM_AREA:
target->state_data.system_area.sectors = 0;
break;
case ISO_WRITE_PRI_VOL_DESC:
target->total_size = target->logical_block - 1;
break;
case ISO_WRITE_VOL_DESC_TERMINATOR:
break;
case ISO_WRITE_L_PATH_TABLE:
target->state_data.path_tables.sectors = 0;
break;
case ISO_WRITE_M_PATH_TABLE:
target->state_data.path_tables.sectors = 0;
break;
case ISO_WRITE_DIR_RECORDS:
target->state_data.dir_records.sectors = 0;
break;
case ISO_WRITE_ER_AREA:
break;
case ISO_WRITE_FILES:
target->state_data.dir_records.sectors = 0;
break;
case ISO_WRITE_DONE:
break;
}
return;
}
int iso_source_generate(struct burn_source *src, unsigned char *buffer,
int size)
{
int next = 0;
enum burn_source_status err = BURN_SOURCE_OK;
struct iso_write_target *target = src->data;
assert(src->read == iso_source_generate &&
src->read_sub == NULL && src->get_size == iso_source_get_size);
/* make sure the app didn't fuck up badly. */
if (size != target->phys_sector_size)
return BURN_SOURCE_FAILED; /* XXX better code */
/* make sure 'buffer' doesn't have anything in it */
memset(buffer, 0, size);
switch (target->state) {
case ISO_WRITE_BEFORE:
/* this should never occur */
assert(0);
case ISO_WRITE_SYSTEM_AREA:
next = iso_write_system_area(target, buffer, &err);
break;
case ISO_WRITE_PRI_VOL_DESC:
/* set target->logical_block to the logical block containing
the root directory record */
target->logical_block = 23;
next = iso_write_pri_volume(target, buffer, &err);
break;
case ISO_WRITE_VOL_DESC_TERMINATOR:
next = iso_write_volume_terminator(target, buffer, &err);
break;
case ISO_WRITE_L_PATH_TABLE:
next = iso_write_path_table(target, buffer, &err, 1);
break;
case ISO_WRITE_M_PATH_TABLE:
next = iso_write_path_table(target, buffer, &err, 0);
break;
case ISO_WRITE_DIR_RECORDS:
next = iso_write_dir_records(target, buffer, &err);
break;
case ISO_WRITE_ER_AREA:
next = iso_write_er_area(target, buffer, &err);
break;
case ISO_WRITE_FILES:
next = iso_write_files(target, buffer, &err);
break;
case ISO_WRITE_DONE:
err = BURN_SOURCE_EOF;
break;
}
if (next)
iso_next_state(target);
return err;
}
/* writes 16 sectors of '0' */
int iso_write_system_area(struct iso_write_target *t,
unsigned char *buffer, enum burn_source_status *err)
{
struct iso_state_system_area *state = &t->state_data.system_area;
memset(buffer, 0, t->phys_sector_size);
return (++state->sectors == 16);
}
/* writes the primary volume descriptor */
int iso_write_pri_volume(struct iso_write_target *t,
unsigned char *buffer, enum burn_source_status *err)
{
/* volume descriptor type (8.4.1) */
buffer[0] = 1;
/* standard identifier (8.4.2) */
memcpy(&buffer[1], "CD001", 5);
/* volume descriptor version (8.4.3) */
buffer[6] = 1;
/* unused field (8.4.4) */
buffer[7] = 0;
/* system identifier (8.4.5) */
/* XXX mkisofs puts "LINUX" here */
memset(&buffer[8], ' ', 32);
/* volume identifier (8.4.6) */
iso_d_strcpy(&buffer[40], 32, t->volset->volume_id[t->volume]);
/* unused field (8.4.7) */
memset(&buffer[72], 0, 8);
/* volume space size (8.4.8) */
iso_bb(&buffer[80], t->volume_space_size, 4);
/* unused field (8.4.9) */
memset(&buffer[88], 0, 32);
/* volume set size (8.4.10) */
iso_bb(&buffer[120], t->volset->volumeset_size, 2);
/* volume sequence number (8.4.11) */
iso_bb(&buffer[124], t->volume + 1, 2);
/* logical block size (8.4.12) */
iso_bb(&buffer[128], t->logical_block_size, 2);
/* path table size (8.4.13) */
iso_bb(&buffer[132], t->path_table_size, 4);
/* location of occurance of type l path table (8.4.14) */
iso_lsb(&buffer[140], t->l_path_table_pos, 4);
/* location of optional occurance of type l path table (8.4.15) */
iso_lsb(&buffer[144], 0, 4);
/* location of occurance of type m path table (8.4.16) */
iso_msb(&buffer[148], t->m_path_table_pos, 4);
/* location of optional occurance of type m path table (8.4.17) */
iso_msb(&buffer[152], 0, 4);
/* directory record for root directory (8.4.18) */
iso_write_dir_record(t, &buffer[156], t->volset->root, DIR_TYPE_ROOT);
/* volume set identifier (8.4.19) */
iso_d_strcpy(&buffer[190], 128, t->volset->volumeset_id);
/* publisher identifier (8.4.20) */
iso_a_strcpy(&buffer[318], 128, t->volset->publisher_id);
/* data preparer identifier (8.4.21) */
iso_a_strcpy(&buffer[446], 128, t->volset->data_preparer_id);
/* application identifier (8.4.22) */
iso_a_strcpy(&buffer[574], 128, APPLICATION_ID);
/* copyright file identifier (8.4.23) */
iso_write_file_id(&buffer[702], 37, t->volset->copyright_file);
/* abstract file identifier (8.4.24) */
iso_write_file_id(&buffer[739], 37, t->volset->abstract_file);
/* bibliographic file identifier (8.4.25) */
iso_write_file_id(&buffer[776], 37, t->volset->bibliographic_file);
/* volume creation date and time (8.4.26) */
/* XXX is this different for multisession? */
iso_datetime_17(&buffer[813], t->now);
/* volume modification date and time (8.4.27) */
iso_datetime_17(&buffer[830], t->now);
/* volume expiration date and time (8.4.28) */
iso_datetime_17(&buffer[847], t->volset->expiration_time);
/* volume effective date and time (8.4.29) */
iso_datetime_17(&buffer[864],
t->volset->effective_time == (time_t) - 1 ?
t->now : t->volset->effective_time);
/* file structure version (8.4.30) */
buffer[881] = 1;
/* reserved for future standardization (8.4.31) */
buffer[882] = 0;
/* application use (8.4.32) */
/* XXX put something in here? does mkisofs? */
memset(&buffer[883], 0, 512);
/* reserved for future standardization (8.4.33) */
memset(&buffer[1395], 0, 653);
return 1;
}
void iso_write_file_id(unsigned char *buf, int size, struct iso_tree_file **f)
{
if (!f)
memset(buf, ' ', size);
else
iso_filecpy(buf, size,
iso_tree_file_get_name(f, ISO_FILE_NAME_ISO),
(*f)->version);
}
/* write the contents of the SP System Use Entry */
/* SUSP-112 5.3 */
static void fill_sp_sue(unsigned char *sp)
{
sp[0] = 'S';
sp[1] = 'P';
sp[2] = 7;
sp[3] = 1;
sp[4] = 190;
sp[5] = 239;
sp[6] = 0;
return;
}
/* write the contents of the CE System Use Entry */
/* SUSP-112 5.1 */
static void fill_ce_sue(struct iso_write_target *t,
unsigned char *ce)
{
ce[0] = 'C';
ce[1] = 'E';
ce[2] = 28;
ce[3] = 1;
iso_bb(&ce[4], 0, 4);
iso_bb(&ce[12], t->susp_er_pos, 4);
/* the length of the rock-ridge er area is 185, and that's all we
* store in the ce area right now */
iso_bb(&ce[20], 185, 4);
return;
}
/* return a string containing the System Use Sharing Protocol information
* for 'ddir'. */
static unsigned char* write_susp_info(struct iso_write_target *t,
struct RRInfo *rr,
enum SUSPType type,
int *len)
{
unsigned char *buffer = NULL;
*len = 0;
/* check to see if susp is even needed (right now, only the rock-ridge
* extensions use it). */
if (iso_volumeset_get_rr(t->volset)) {
int char_size, size = 0, offset = 0;
int len_sp, len_ce, len_px, len_tf, len_nm;
unsigned char *sp, *ce;
char_size = sizeof (unsigned char *);
len_sp = len_ce = 0;
if (type & SUSP_TYPE_SP) {
len_sp = 7; /* 7 bytes for the SP System Use Entry */
sp = malloc(char_size * len_sp);
fill_sp_sue(sp);
size += len_sp;
} else {
sp = NULL;
}
if (type & SUSP_TYPE_CE) {
len_ce = 28; /* 28 bytes for the CE System Use Entry */
ce = malloc(char_size * len_ce);
fill_ce_sue(t, ce);
size += len_ce;
} else {
ce = NULL;
}
if (rr->px[0] != 0) {
/* the 3rd byte of the PX field holds its length */
len_px = rr->px[2];
size += len_px;
} else {
len_px = 0;
}
if (rr->tf) {
/* the 3rd byte of the TF field holds its length */
len_tf = rr->tf[2];
size += len_tf;
} else {
len_tf = 0;
}
if ((type & SUSP_TYPE_NM) && rr->nm) {
/* the 3rd byte of the NM field holds its length */
len_nm = rr->nm[2];
size += len_nm;
} else {
len_nm = 0;
}
/* fill 'buffer' with the susp info */
buffer = malloc(char_size * (size + 1));
if (sp) {
memcpy(buffer + offset, sp, len_sp);
offset += len_sp;
}
if (ce) {
memcpy(buffer + offset, ce, len_ce);
offset += len_ce;
}
if (len_px) {
memcpy(buffer + offset, rr->px, len_px);
offset += len_px;
}
if (len_tf) {
memcpy(buffer + offset, rr->tf, len_tf);
offset += len_tf;
}
if (len_nm) {
memcpy(buffer + offset, rr->nm, len_nm);
offset += len_nm;
}
buffer[offset] = '\0';
*len = offset;
}
return buffer;
}
int iso_write_dir_record(struct iso_write_target *t,
unsigned char *buffer,
struct iso_tree_dir **ddir, enum DirType type)
{
int len_fi, len_susp, sz;
const char *fi = NULL;
unsigned char *susp; /* the contents, if any, of the "system use sharing protocol" buffer */
struct iso_tree_dir *dir = *ddir;
if (type != DIR_TYPE_NORMAL)
len_fi = 1;
else {
assert(dir->parent);
fi = iso_tree_dir_get_name(ddir, ISO_FILE_NAME_ISO);
len_fi = strlen(fi);
}
/* determine if this is the root directory record */
if ((*t->volset->root == dir) && (type == DIR_TYPE_SELF))
susp = write_susp_info(t, &dir->rr, SUSP_TYPE_SP | SUSP_TYPE_CE, &len_susp);
/* determine if this a SELF or PARENT directory record */
else if (type != DIR_TYPE_NORMAL)
susp = write_susp_info(t, &dir->rr, 0, &len_susp);
/* none of the above == a normal directory record */
else
susp = write_susp_info(t, &dir->rr, SUSP_TYPE_NM, &len_susp);
sz = 33 + len_fi + len_susp + !(len_fi % 2);
/* length of directory record (9.1.1) */
buffer[0] = sz;
/* extended attribute record length (9.1.2) */
buffer[1] = 0; /* XXX allow for extended attribute records */
/* location of extent (9.1.3) */
iso_bb(&buffer[2], dir->logical_block, 4);
/* data length (9.1.4) */
iso_bb(&buffer[10], dir->size, 4);
/* recording date and time (9.1.5) */
iso_datetime_7(&buffer[18], t->now);
/* file flags (9.1.6) */
buffer[25] = ISO_FILE_FLAG_DIRECTORY;
/* file unit size (9.1.7) */
buffer[26] = 0; /* XXX support this shit? */
/* interleave gap size (9.1.8) */
buffer[27] = 0; /* XXX support this shit? */
/* volume sequence number (9.1.9) */
iso_bb(&buffer[28], dir->volume + 1, 2);
/* length of file identifier (9.1.10) */
buffer[32] = len_fi;
/* file identifier */
switch (type) {
case DIR_TYPE_ROOT:
case DIR_TYPE_SELF:
buffer[33] = 0;
break;
case DIR_TYPE_PARENT:
buffer[33] = 1;
break;
case DIR_TYPE_NORMAL:
iso_d_strcpy(&buffer[33], len_fi, fi);
break;
}
if (!(len_fi % 2))
buffer[33 + len_fi] = 0;
/* system use sharing protocol */
if (susp)
{
int offset;
if (!(len_fi % 2))
offset = 34;
else
offset = 33;
memcpy(&buffer[offset + len_fi], susp, len_susp);
}
return sz;
}
/* write the file record as per (9.1) */
int iso_write_file_record(struct iso_write_target *t,
unsigned char *buffer,
struct iso_tree_file **ffile, enum DirType type)
{
int len_fi, len_susp;
const char *fi = NULL;
unsigned char *susp; /* the contents, if any, of the "system use sharing protocol" buffer */
int sz;
struct iso_tree_file *file = *ffile;
if (type != DIR_TYPE_NORMAL)
len_fi = 1;
else {
fi = iso_tree_file_get_name(ffile, ISO_FILE_NAME_ISO);
len_fi = strlen(fi);
}
susp = write_susp_info(t, &file->rr, SUSP_TYPE_NM, &len_susp);
sz = 33 + len_fi + len_susp + !(len_fi % 2);
/* length of directory record (9.1.1) */
buffer[0] = sz;
/* extended attribute record length (9.1.2) */
buffer[1] = 0; /* XXX allow for extended attribute records */
/* location of extent (9.1.3) */
iso_bb(&buffer[2], file->logical_block, 4);
/* data length (9.1.4) */
iso_bb(&buffer[10], file->size, 4);
/* recording date and time (9.1.5) */
iso_datetime_7(&buffer[18], t->now);
/* file flags (9.1.6) */
buffer[25] = ISO_FILE_FLAG_NORMAL;
/* file unit size (9.1.7) */
buffer[26] = 0; /* XXX support this shit? */
/* interleave gap size (9.1.8) */
buffer[27] = 0; /* XXX support this shit? */
/* volume sequence number (9.1.9) */
iso_bb(&buffer[28], file->volume + 1, 2);
/* length of file identifier (9.1.10) */
buffer[32] = len_fi;
/* file identifier */
switch (type) {
case DIR_TYPE_ROOT:
case DIR_TYPE_SELF:
buffer[33] = 0;
break;
case DIR_TYPE_PARENT:
buffer[33] = 1;
break;
case DIR_TYPE_NORMAL:
memcpy(&buffer[33], fi, len_fi);
break;
}
if (!(len_fi % 2))
buffer[33 + len_fi] = 0;
/* system use sharing protocol */
if (susp)
{
int offset;
if (!(len_fi % 2))
offset = 34;
else
offset = 33;
memcpy(&buffer[offset + len_fi], susp, len_susp);
}
return sz;
}
/* writes the volume descriptor set terminator */
int iso_write_volume_terminator(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err)
{
/* volume descriptor type (8.3.1) */
buffer[0] = 255;
/* standard identifier (8.3.2) */
memcpy(&buffer[1], "CD001", 5);
/* volume descriptor version (8.3.3) */
buffer[6] = 1;
/* reserved for future standardization (8.3.4) */
memset(&buffer[7], 0, 2041);
return 1;
}
/* write the path record for 'ddir' into 'buffer' */
int write_path_table_record(unsigned char *buffer,
struct iso_tree_dir **ddir, int *position, int lsb)
{
int len, bytes_written;
short parent_position;
const char *name;
struct iso_tree_dir *dir = *ddir;
/* set the position in the path table of this directory */
dir->position = *position;
/* increment the position for the next path table record */
*position += 1;
if (dir->parent)
parent_position = dir->parent->position;
else
parent_position = 1;
name = iso_tree_dir_get_name(ddir, ISO_FILE_NAME_ISO);
if (name)
len = strlen(name);
else
len = 1;
/* the directory identifier length (9.4.1) */
buffer[0] = len;
/* the extended attribute record length (9.4.2) */
buffer[1] = 0;
/* location of extent (9.4.3) */
if (lsb)
iso_lsb(&buffer[2], dir->logical_block, 4);
else
iso_msb(&buffer[2], dir->logical_block, 4);
/* parent directory record (9.4.4) */
if (lsb)
iso_lsb(&buffer[6], parent_position, 2);
else
iso_msb(&buffer[6], parent_position, 2);
/* the directory identifier (9.4.5) */
if (name)
memcpy(&buffer[8], name, len);
else
memset(&buffer[8], 0, len);
/* padding field (9.4.6) */
if (len % 2) {
bytes_written = 9 + len;
buffer[bytes_written] = 0;
} else
bytes_written = 8 + len;
return bytes_written;
}
/* recursive function used to write the path records for each level
* of the file system sequentially, i.e. root, then all children of
* root, then all grandchildren of root, then all great-grandchildren
* of root, etc. */
int write_path_table_records(unsigned char *buffer,
struct iso_tree_dir **ddir,
int level, int *position, int lsb)
{
int i, offset;
struct iso_tree_dir *dir = *ddir;
/* ISO9660 only allows directories to be nested 8-deep */
if (level >= 8)
return 0;
if (!level) {
offset = write_path_table_record(buffer, ddir, position, lsb);
} else {
offset = 0;
for (i = 0; i < dir->nchildren; ++i) {
offset += write_path_table_records(buffer + offset,
dir->children[i].me,
level - 1,
position, lsb);
}
}
return offset;
}
/* writes set of path table records */
int iso_write_path_table(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err, int lsb)
{
int i, offset, position;
struct iso_state_path_tables *state = &t->state_data.path_tables;
if (state->sectors) {
offset = 0;
position = 1;
for (i = 0; i < 8; ++i) {
offset += write_path_table_records(buffer + offset,
t->volset->root,
i, &position, lsb);
}
} else {
/* empty buffer sector */
memset(buffer, 0, t->phys_sector_size);
}
return (++state->sectors == 2);
}
struct iso_tree_dir **find_dir_at_block(struct iso_tree_dir **ddir, int block)
{
int i;
struct iso_tree_dir *dir = *ddir;
struct iso_tree_dir **to_write = NULL;
if (dir->logical_block == block)
to_write = ddir;
for (i = 0; (i < dir->nchildren) && !to_write; ++i) {
to_write = find_dir_at_block(dir->children[i].me, block);
}
return to_write;
}
struct iso_tree_file **find_file_at_block(struct iso_tree_dir **ddir, int block)
{
int i;
struct iso_tree_dir *dir = *ddir;
struct iso_tree_file **to_write = NULL;
for (i = 0; (i < dir->nfiles) && !to_write; ++i) {
if (dir->files[i].logical_block == block)
to_write = dir->files[i].me;
}
for (i = 0; (i < dir->nchildren) && !to_write; ++i) {
to_write = find_file_at_block(dir->children[i].me, block);
}
return to_write;
}
/* write the records for children of 'dir' */
void write_child_records(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err, struct iso_tree_dir *dir)
{
int file_counter, dir_counter, order, offset;
file_counter = dir_counter = offset = 0;
while ((file_counter < dir->nfiles) || (dir_counter < dir->nchildren)) {
/* if there are files and dirs, compare them to figure out
which comes 1st alphabetically */
if ((file_counter < dir->nfiles) &&
(dir_counter < dir->nchildren)) {
const char *dirname, *filename;
dirname = iso_tree_dir_get_name
(dir->children[dir_counter].me,
ISO_FILE_NAME_ISO);
filename = iso_tree_file_get_name
(dir->files[file_counter].me,
ISO_FILE_NAME_ISO);
order = strcmp(dirname, filename);
} else {
if (file_counter < dir->nfiles)
/* only files are left */
order = 1;
else
/* only dirs are left */
order = -1;
}
if (order < 0) {
offset += iso_write_dir_record(t,
buffer + offset,
dir->
children[dir_counter].
me, DIR_TYPE_NORMAL);
dir_counter++;
} else {
offset += iso_write_file_record(t,
buffer + offset,
dir->
files[file_counter].me,
DIR_TYPE_NORMAL);
file_counter++;
}
}
return;
}
/* write out the next directory record */
int iso_write_dir_records(struct iso_write_target *t,
unsigned char *buffer, enum burn_source_status *err)
{
int finished, offset;
struct iso_tree_dir **ddir, *dir;
struct iso_state_dir_records *state = &t->state_data.dir_records;
finished = 0; /* set to 1 when all directory records have
been written */
if (state->sectors++) {
/* t->logical_block is the next block to write. find the dir
record which belongs there and write it out. if none
exists, we're done writing the directory records. */
ddir = find_dir_at_block(t->volset->root, t->logical_block);
if (ddir) {
/* 1) write the record for this directory 2) write the
record for the parent directory 3) write the
records for all child files and directories */
dir = *ddir;
offset = iso_write_dir_record(t,
buffer,
ddir, DIR_TYPE_SELF);
if (!dir->parent) {
/* this is the root directory */
offset += iso_write_dir_record(t,
buffer + offset,
ddir,
DIR_TYPE_PARENT);
} else {
offset += iso_write_dir_record(t,
buffer + offset,
dir->parent->me,
DIR_TYPE_PARENT);
}
write_child_records(t, buffer + offset, err, dir);
/* dir->size should always be a multiple of
t->phys_sector_size */
t->logical_block += (dir->size / t->phys_sector_size);
} else {
/* we just wrote out 2048 0's, so we still need to
increment this */
t->logical_block++;
finished = 1;
}
}
return finished;
}
/* write the 'ER' area of the disc (RRIP-112: 4.3) */
int iso_write_er_area(struct iso_write_target *t,
unsigned char *buffer,
enum burn_source_status *err)
{
if (iso_volumeset_get_rr(t->volset)) {
char *text;
int len;
buffer[0] = 'E';
buffer[1] = 'R';
buffer[2] = 237;
buffer[3] = 1;
buffer[4] = 10;
buffer[5] = 84;
buffer[6] = 135;
buffer[7] = 1;
text = strdup(""
"RRIP_1991ATHE ROCK RIDGE INTERCHANGE PROTOCOL "
"PROVIDES SUPPORT FOR POSIX FILE SYSTEM "
"SEMANTICSPLEASE CONTACT DISC PUBLISHER FOR "
"SPECIFICATION SOURCE. SEE PUBLISHER IDENTIFIER IN "
"PRIMARY VOLUME DESCRIPTOR FOR CONTACT INFORMATION");
len = strlen (text);
memcpy (buffer + 8, text, len);
free (text);
/* next logical block... */
t->logical_block++;
}
return 1;
}
int copy_file_to_buffer(FILE * fd, unsigned char *buffer, int length)
{
int read;
read = fread(buffer, 1, length, fd);
return read;
}
int iso_write_files(struct iso_write_target *t,
unsigned char *buffer, enum burn_source_status *err)
{
FILE *fd;
int finished, sectors;
struct iso_tree_file **ffile, *file;
struct iso_state_files *state = &t->state_data.files;
finished = 0;
if (state->sectors) {
/* continue writing the file at 't->logical_block' to
'buffer', then incremenet 't->logical_block' to the next
file section. */
fd = t->current_fd;
file = *(t->current_file);
/* copy one sector of 'ffile' into 'buffer' */
state->sectors +=
copy_file_to_buffer(fd, buffer, t->phys_sector_size);
if (feof(fd)) {
fclose(fd);
state->sectors = 0;
sectors = file->size / t->phys_sector_size;
if (file->size % t->phys_sector_size)
sectors++;
t->logical_block += sectors;
}
} else {
/* start writing the file at 't->logical_block' to 'buffer'.
if none exists, we are done. */
ffile = find_file_at_block(t->volset->root, t->logical_block);
if (ffile) {
t->current_file = ffile;
file = *ffile;
fd = fopen(file->path, "r");
t->current_fd = fd;
if (fd) {
state->sectors += copy_file_to_buffer(fd,
buffer,
t->
phys_sector_size);
}
if (feof(fd)) {
fclose(fd);
fd = NULL;
}
if (!fd) {
state->sectors = 0;
sectors = file->size / t->phys_sector_size;
if (file->size % t->phys_sector_size)
sectors++;
/* ensure we move past this logical block if the file was empty */
else if (!file->size)
sectors++;
t->logical_block += sectors;
}
} else
finished = 1;
}
return finished;
}