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deeb8cc725d135477c1cc882e6c90357f2c6a32f
dvdisaster/udf.c
TANIGUCHI Takaki 606d4178ee Imported Upstream version 0.72.3
2012-03-06 11:23:04 +09:00

1260 lines
36 KiB
C
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/* dvdisaster: Additional error correction for optical media.
* Copyright (C) 2004-2011 Carsten Gnoerlich.
* Project home page: http://www.dvdisaster.com
* Email: carsten@dvdisaster.com -or- cgnoerlich@fsfe.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
* or direct your browser at http://www.gnu.org.
*/
#include "dvdisaster.h"
#include "udf.h"
#include "rs02-includes.h"
/***
*** Look for ecc headers in RS02 style media
***/
enum { HEADER_FOUND, TRY_NEXT_HEADER, TRY_NEXT_MODULO};
static int try_sector(DeviceHandle *dh, gint64 pos, EccHeader **ehptr, unsigned char *secbuf)
{ EccHeader *eh;
unsigned char fingerprint[16];
guint32 recorded_crc;
guint32 real_crc;
gint64 last_fp = -1;
/* Try reading the sector */
Verbose("udf/try_sector: trying sector %lld\n", pos);
if(ReadSectorsFast(dh, secbuf, pos, 2))
{ Verbose("udf/try_sector: read error, trying next header\n");
return TRY_NEXT_HEADER;
}
eh = (EccHeader*)secbuf;
/* See if the magic cookie is there. If not, searching within
this modulo makes no sense for write-once media.
However if the medium is rewriteable, there might be trash
data behind the image. So finding an invalid sector
does not imply there is no RS02 data present.
Added workaround: Avoid misrecognizing RS03 images */
if(strncmp((char*)eh->cookie, "*dvdisaster*RS02", 16))
{ if(dh->rewriteable)
{ Verbose("udf/try_sector: no cookie but rewriteable medium: skipping header\n");
return TRY_NEXT_HEADER;
}
else
{ Verbose("udf/try_sector: no cookie, skipping current modulo\n");
return TRY_NEXT_MODULO;
}
}
else Verbose("udf/try_sector: header at %lld: magic cookie found\n", (long long int)pos);
/* Calculate CRC */
recorded_crc = eh->selfCRC;
#ifdef HAVE_BIG_ENDIAN
eh->selfCRC = 0x47504c00;
#else
eh->selfCRC = 0x4c5047;
#endif
real_crc = Crc32((unsigned char*)eh, sizeof(EccHeader));
if(real_crc != recorded_crc)
{ Verbose("udf/try_sector: CRC failed, skipping header\n");
return TRY_NEXT_HEADER;
}
eh = g_malloc(sizeof(EccHeader));
memcpy(eh, secbuf, sizeof(EccHeader));
#ifdef HAVE_BIG_ENDIAN
SwapEccHeaderBytes(eh);
#endif
eh->selfCRC = recorded_crc;
Verbose("udf/try_sector: CRC okay\n");
/* Compare medium fingerprint with that recorded in Ecc header */
if(last_fp != eh->fpSector) /* fingerprint in different sector as before? */
{ int fp_read;
/* read new fingerprint */
fp_read = GetMediumFingerprint(dh, fingerprint, eh->fpSector);
last_fp = eh->fpSector;
if(!fp_read) /* be optimistic if fingerprint sector is unreadable */
{ *ehptr = eh;
Verbose("udf/try_sector: read error in fingerprint sector\n");
return HEADER_FOUND;
}
if(!memcmp(fingerprint, eh->mediumFP, 16)) /* good fingerprint */
{ *ehptr = eh;
Verbose("udf/try_sector: fingerprint okay, header good\n");
return HEADER_FOUND;
}
/* This might be a header from a larger previous session.
Discard it and continue */
Verbose("udf/try_sector: fingerprint mismatch, skipping sector\n");
g_free(eh);
}
return TRY_NEXT_HEADER;
}
/*
* Dialog components for disabling RS02 search
*/
static void no_rs02_cb(GtkWidget *widget, gpointer data)
{ int state = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
if(state) Closure->querySize = 1;
else Closure->querySize = 2;
UpdatePrefsQuerySize();
}
static void insert_buttons(GtkDialog *dialog)
{ GtkWidget *check,*align;
gtk_dialog_add_buttons(dialog,
_utf("Skip RS02 test"), 1,
_utf("Continue searching"), 0, NULL);
align = gtk_alignment_new(0.5, 0.5, 0.0, 0.0);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), align, FALSE, FALSE, 0);
check = gtk_check_button_new_with_label(_utf("Disable RS02 initialization in the preferences"));
gtk_container_add(GTK_CONTAINER(align), check);
gtk_container_set_border_width(GTK_CONTAINER(align), 10);
g_signal_connect(G_OBJECT(check), "toggled", G_CALLBACK(no_rs02_cb), NULL);
gtk_widget_show(align);
gtk_widget_show(check);
}
/*
* RS02 header search
*/
EccHeader* FindHeaderInMedium(DeviceHandle *dh, gint64 max_sectors)
{ AlignedBuffer *ab = CreateAlignedBuffer(4096);
EccHeader *eh = NULL;
Bitmap *try_next_header, *try_next_modulo;
gint64 pos;
gint64 header_modulo;
int read_count = 0;
int answered_continue = FALSE;
int warning_shown = FALSE;
/*** Quick search at fixed offsets relative to ISO filesystem */
if(!max_sectors)
{ if(dh->isoInfo)
{ gint64 iso_size = dh->isoInfo->volumeSize;
/* Iso size is correct; look for root sector at +2 */
if(try_sector(dh, iso_size, &eh, ab->buf) == HEADER_FOUND)
{ Verbose("Root sector search at +0 successful\n");
FreeAlignedBuffer(ab);
return eh;
}
/* Strange stuff. Sometimes the iso size is increased by 150
sectors by the burning software. */
if(try_sector(dh, iso_size-150, &eh, ab->buf) == HEADER_FOUND)
{ Verbose("Root sector search at -150 successful\n");
FreeAlignedBuffer(ab);
return eh;
}
}
FreeAlignedBuffer(ab);
return NULL;
}
/*** Normal exhaustive search */
header_modulo = (gint64)1<<62;
try_next_header = CreateBitmap0(max_sectors);
try_next_modulo = CreateBitmap0(max_sectors);
Verbose("Medium rewriteable: %s\n", dh->rewriteable ? "TRUE" : "FALSE");
/*** Search for the headers */
while(header_modulo >= 32)
{ pos = max_sectors & ~(header_modulo - 1);
Verbose("FindHeaderInMedium: Trying modulo %lld\n", header_modulo);
while(pos > 0)
{ int result;
if(Closure->stopActions)
goto bail_out;
if(GetBit(try_next_header, pos))
{ Verbose("Sector %lld cached; skipping\n", pos);
goto check_next_header;
}
if(GetBit(try_next_modulo, pos))
{ Verbose("Sector %lld cached; skipping modulo\n", pos);
goto check_next_modulo;
}
result = try_sector(dh, pos, &eh, ab->buf);
switch(result)
{ case TRY_NEXT_HEADER:
SetBit(try_next_header, pos);
read_count++;
if(!answered_continue && read_count > 5)
{ if(Closure->guiMode)
{ int answer = ModalDialog(GTK_MESSAGE_QUESTION, GTK_BUTTONS_NONE, insert_buttons,
_("Faster medium initialization\n\n"
"Searching this medium for error correction data may take a long time.\n"
"Press \"Skip RS02 test\" if you are certain that this medium was\n"
"not augmented with RS02 error correction data."));
if(answer) goto bail_out;
answered_continue = TRUE;
}
if(!Closure->guiMode && !warning_shown)
{ PrintCLI(_("\nSearching this medium for error correction data may take a long time.\n"
"If you are certain that this medium was not augmented with RS02 error correction\n"
"data, you might wish to abort this command and re-run with the option\n"
"--query-size=udf\n"));
warning_shown = TRUE;
}
}
goto check_next_header;
case TRY_NEXT_MODULO:
SetBit(try_next_modulo, pos);
goto check_next_modulo;
case HEADER_FOUND:
FreeBitmap(try_next_header);
FreeBitmap(try_next_modulo);
FreeAlignedBuffer(ab);
return eh;
}
check_next_header:
pos -= header_modulo;
}
check_next_modulo:
header_modulo >>= 1;
}
bail_out:
FreeBitmap(try_next_header);
FreeBitmap(try_next_modulo);
FreeAlignedBuffer(ab);
return NULL;
}
gint64 MediumLengthFromRS02(DeviceHandle *dh, gint64 max_size)
{ EccHeader *eh;
RS02Layout *lay;
gint64 real_size;
eh = FindHeaderInMedium(dh, max_size);
if(eh)
{ dh->rs02Header = eh;
lay = CalcRS02Layout(uchar_to_gint64(eh->sectors), eh->eccBytes);
real_size = lay->eccSectors+lay->dataSectors;
g_free(lay);
return real_size;
}
return 0;
}
/***
*** Rudimentary UDF and ISO filesystem parsing.
***
* Information about UDF and ISO was gathered from ECMA-119,
* ECMA-167, ECMA-167 and the UDF 2.6 standard from OSTA.org.
* However, no claims are made to be actually conformant to any
* of those standards.
*/
/*
* ECMA sector indices start with 1;
* this definition make it easier to use the standard for reading strings
* from the buffer.
* begin and end are the bp postions of the string start and end position.
*/
/*
* 8bit values
*/
#define bp_get_byte(buf, idx) (buf[(idx)-1])
#define bp_set_byte(buf, idx, byte) (buf[(idx)-1] = (unsigned char)byte)
/*
* 16bit both byte order
*/
#ifdef HAVE_BIG_ENDIAN
#define bp_get_short_bbo(buf, idx) (*((guint16*)(buf+idx+1)))
#else
#define bp_get_short_bbo(buf, idx) (*((guint16*)(buf+idx-1)))
#endif
static void bp_set_short_bbo(unsigned char *buf, int idx, guint16 value)
{ unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = yz;
*buf++ = wx;
*buf++ = wx;
*buf++ = yz;
}
static void bp_set_short_lsb(unsigned char *buf, int idx, guint16 value)
{ unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = yz;
*buf++ = wx;
}
static void bp_set_short_msb(unsigned char *buf, int idx, guint16 value)
{ unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = wx;
*buf++ = yz;
}
/*
* 32bit single byte order
*/
#ifdef HAVE_BIG_ENDIAN
#define bp_get_long_lsb(buf, idx) (((guint32)buf[(idx)+2])<<24|((guint32)buf[(idx)+1])<<16|((guint32)buf[(idx)])<<8|((guint32)buf[(idx)-1]))
#else
#define bp_get_long_lsb(buf, idx) (*((guint32*)(buf+idx-1)))
#endif
#define bp_get_long_msb(buf, idx) (((guint32)buf[(idx)-1])<<24|((guint32)buf[idx])<<16|((guint32)buf[(idx)+1])<<8|((guint32)buf[(idx)+2]))
static void bp_set_long_lsb(unsigned char *buf, int idx, guint32 value)
{ unsigned char st = (value >> 24) & 0xff;
unsigned char uv = (value >> 16) & 0xff;
unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = yz;
*buf++ = wx;
*buf++ = uv;
*buf++ = st;
}
static void bp_set_long_msb(unsigned char *buf, int idx, guint32 value)
{ unsigned char st = (value >> 24) & 0xff;
unsigned char uv = (value >> 16) & 0xff;
unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = st;
*buf++ = uv;
*buf++ = wx;
*buf++ = yz;
}
/*
* 32bit both byte order
*/
#ifdef HAVE_BIG_ENDIAN
#define bp_get_long_bbo(buf, idx) (*((guint32*)(buf+idx+3)))
#else
#define bp_get_long_bbo(buf, idx) (*((guint32*)(buf+idx-1)))
#endif
static void bp_set_long_bbo(unsigned char *buf, int idx, guint32 value)
{ unsigned char st = (value >> 24) & 0xff;
unsigned char uv = (value >> 16) & 0xff;
unsigned char wx = (value >> 8) & 0xff;
unsigned char yz = value & 0xff;
buf = buf + idx - 1;
*buf++ = yz;
*buf++ = wx;
*buf++ = uv;
*buf++ = st;
*buf++ = st;
*buf++ = uv;
*buf++ = wx;
*buf++ = yz;
}
static void bp_get(unsigned char *dest, unsigned char *src, int begin, int end)
{ int length = end-begin+1;
strncpy((char*)dest, (char*)src+begin-1, length);
}
#if 0
static void bp_set(unsigned char *dest, unsigned char *src, int begin, int end)
{ int length = end-begin+1;
memcpy((char*)dest+begin-1, (char*)src, length);
}
#endif
/*
* String operations
*/
static void bp_get_string(unsigned char *dest, unsigned char *src, int begin, int end)
{ int length = end-begin+1;
strncpy((char*)dest, (char*)src+begin-1, length);
dest[length] = 0;
}
static void bp_set_string(unsigned char *dest, char *src, int begin, int end)
{ int length = end-begin+1;
strncpy((char*)(dest+begin-1), src, length);
}
/*
* D1 string conversion currently simply expands the string to 16bit characters.
*/
static void bp_set_d1_string(unsigned char *dest, char *src, int begin, int end)
{
dest = dest + begin - 1;
while(begin<=end-2 && *src)
{ *dest++ = 0;
*dest++ = (unsigned char)*src++;
begin += 2;
}
}
/*
* Date values
*/
static void get_date(unsigned char *date, unsigned char *buf, int idx)
{
idx--;
sprintf((char*)date, "dd-mm-yyyy hh:mm:ss.ss");
bp_get(date+ 6, buf, idx+ 1, idx+ 4);
bp_get(date+ 3, buf, idx+ 5, idx+ 6);
bp_get(date+ 0, buf, idx+ 7, idx+ 8);
bp_get(date+11, buf, idx+ 9, idx+10);
bp_get(date+14, buf, idx+11, idx+12);
bp_get(date+17, buf, idx+13, idx+14);
bp_get(date+20, buf, idx+15, idx+16);
}
static void set_date(unsigned char *date, int idx,
int year, int month, int day,
int hour, int minute, int second, int hsecond,
int gmt_offset)
{
sprintf((char*)(date+idx-1), "%04d%02d%02d%02d%02d%02d%02d",
year, month, day, hour, minute, second, hsecond);
*(date+idx+15) = (unsigned char)gmt_offset;
}
static void set_binary_date(unsigned char *dest, int idx,
int year, int month, int day,
int hour, int minute, int second,
int gmt_offset)
{
dest = dest + idx - 1;
*dest++ = (unsigned char)year;
*dest++ = (unsigned char)month;
*dest++ = (unsigned char)day;
*dest++ = (unsigned char)hour;
*dest++ = (unsigned char)minute;
*dest++ = (unsigned char)second;
*dest++ = (unsigned char)gmt_offset;
}
static void beautify_dchar(char *dchar)
{ int idx = strlen(dchar)-1;
while(idx>=0)
{ if(dchar[idx] != ' ') break;
dchar[idx--] = 0;
}
while(idx>0)
{ if(dchar[idx-1] != ' ')
dchar[idx] = tolower((int)dchar[idx]);
idx--;
}
if(!*dchar) strcpy(dchar, _("Unnamed"));
}
/***
*** Extract some useful information from the ISO file system
***/
void FreeIsoInfo(IsoInfo *ii)
{
g_free(ii);
}
static IsoInfo* examine_primary_vd(unsigned char *buf)
{ IsoInfo *ii = g_malloc(sizeof(IsoInfo));
unsigned char vlabel[33];
unsigned char str[80];
guint32 x,vss;
unsigned char date[32];
bp_get_string(str, buf, 9, 40);
Verbose(" System identifier : |%s|\n", str);
bp_get_string(vlabel, buf, 41, 72);
Verbose(" Volume identifier : |%s|\n", vlabel);
vss = bp_get_long_bbo(buf, 81);
Verbose(" Volume space size : %d sectors\n", vss);
x = bp_get_short_bbo(buf, 121);
Verbose(" Volume set size : %d\n", x);
x = bp_get_short_bbo(buf, 125);
Verbose(" Volume sequence size : %d\n", x);
x = bp_get_short_bbo(buf, 129);
Verbose(" Logical block size : %d\n", x);
x = bp_get_long_bbo(buf, 133);
Verbose(" Path table size : %d bytes\n", x);
x = bp_get_long_lsb(buf, 141);
Verbose(" L-Path table location : %d\n", x);
x = bp_get_long_lsb(buf, 145);
Verbose(" Opt L-Path table location : %d\n", x);
x = bp_get_long_msb(buf, 149);
Verbose(" M-Path table location : %d\n", x);
x = bp_get_long_msb(buf, 153);
Verbose(" Opt M-Path table location : %d\n", x);
/* 157 .. 190 directory record */
/* 191 .. 318 Volume set identifier */
/* 319 .. 446 Publisher Identifier */
/* 447 .. 574 Data Preparer Identifier */
/* 575 .. 702 Application Identfier */
/* 703 .. 739 Copyright File Identifier */
/* 740 .. 776 Abstract File Identifier */
/* 777 .. 813 Bibliographic File Identifier */
get_date(date, buf, 814);
Verbose(" Volume creation date/time : %s\n", date);
get_date(str, buf, 831);
Verbose(" Volume modification d/t : %s\n", str);
get_date(str, buf, 848);
Verbose(" Volume expiration d/t : %s\n", str);
get_date(str, buf, 865);
Verbose(" Volume effective d/t : %s\n", str);
x = bp_get_byte(buf,882);
Verbose(" File structure version : %d\n", x);
/* Extract information for IsoInfo */
ii->volumeSize = vss;
if(!Closure->screenShotMode)
{ strcpy(ii->volumeLabel, (char*)vlabel);
beautify_dchar(ii->volumeLabel);
}
else strcpy(ii->volumeLabel, _("Example disc"));
strcpy(ii->creationDate, (char*)date);
ii->creationDate[10] = 0;
return ii;
}
static IsoInfo* examine_iso(DeviceHandle *dh)
{ AlignedBuffer *ab = CreateAlignedBuffer(2048);
unsigned char *buf = ab->buf;
IsoInfo *ii = NULL;
int sector,status;
int vdt,vdt_ver;
unsigned char sid[6];
Verbose(" Examining the ISO file system...\n");
/*** Iterate over the volume decriptors */
for(sector=16; sector<32; sector++)
{ if(Closure->stopActions)
continue;
status = ReadSectorsFast(dh, buf, sector, 1);
if(status)
{ Verbose(" Sector %2d: unreadable\n", sector);
continue;
}
vdt = bp_get_byte(buf, 1); /* Volume descriptor type */
bp_get_string(sid, buf, 2, 6); /* Standard identifier */
vdt_ver = bp_get_byte(buf,7); /* Volume descriptor version */
Verbose(" Sector %2d:\n"
" Volume descriptor type = %d\n"
" Volume descriptor version = %d\n"
" Standard identifier = %s\n",
sector, vdt, vdt_ver, sid);
if(strncmp((char*)sid,"CD001",5))
{ Verbose(" * Wrong or missing standard identifier.\n");
continue;
}
switch(vdt)
{ case 0: Verbose(" -> boot record: *skipped*\n");
break;
case 1: Verbose(" -> primary volume descriptor:\n");
ii = examine_primary_vd(buf);
break;
case 2: Verbose(" -> supplementary volume descriptor: *skipped*\n");
break;
case 255: Verbose(" -> volume descriptor set terminator;\n"
" end of ISO file system parsing.\n");
goto finished;
break;
default : Verbose(" -> unknown volume descriptor: *skipped*\n");
break;
}
}
finished:
FreeAlignedBuffer(ab);
return ii;
}
/***
*** The main wrapper for visiting the ISO and UDF file system structures
***/
int ExamineUDF(DeviceHandle *dh)
{
Verbose("\nExamineUDF(%s)\n",dh->devinfo);
dh->isoInfo = examine_iso(dh);
Verbose(" Examining the UDF file system...\n");
Verbose(" not yet implemented.\n\n");
/* Try to find the root header at a fixed offset to the ISO filesystem end. */
dh->rs02Size = MediumLengthFromRS02(dh, 0);
return TRUE;
}
/***
*** Rudimentary support for creating .iso images.
*** Currently only used for creating the random image;
* can only create .iso images containing exactly one file.
*/
/*
* Directory record writing
*/
static IsoDir* create_iso_dir()
{ IsoDir *id = g_malloc0(sizeof(IsoDir));
id->dir = g_malloc0(2048);
id->nSectors = 1;
return id;
}
static void free_iso_dir(IsoDir *id)
{ g_free(id->dir);
g_free(id);
}
static void add_directory_record(IsoDir *iso_dir,
int extent, int file_flags, int file_identifier,
int year, int month, int day,
int hour, int minute, int second, int gmt_offset)
{ unsigned char *dir = iso_dir->dir + iso_dir->tail;
iso_dir->tail += 34;
bp_set_byte(dir, 1, 34); /* Length of directory record */
bp_set_byte(dir, 2, 0); /* Extended attribute length */
bp_set_long_bbo(dir, 3, extent); /* Location of Extent */
bp_set_long_bbo(dir, 11, 2048); /* Data length of file section */
set_binary_date(dir, 19, /* Binary date rep of creation time */
year,month,day,hour,minute,second,gmt_offset);
bp_set_byte(dir, 26, file_flags); /* File flags (we are a directory) */
bp_set_byte(dir, 27, 0); /* File unit size if interleaved */
bp_set_byte(dir, 28, 0); /* Interleave gap size */
bp_set_short_bbo(dir, 29, 1); /* Volume sequence number */
bp_set_byte(dir, 33, 1); /* Length of file identifier */
bp_set_byte(dir, 34, file_identifier); /* File identifier */
}
static void add_file_record(IsoDir *iso_dir, char *filename, guint64 size, int extent,
int year, int month, int day,
int hour, int minute, int second, int gmt_offset)
{ unsigned char *dir = iso_dir->dir + iso_dir->tail;
int sl = strlen(filename);
int entry_len = 34+sl;
iso_dir->tail += entry_len;
bp_set_byte(dir, 1, entry_len); /* Length of directory record */
bp_set_byte(dir, 2, 0); /* Extended attribute length */
bp_set_long_bbo(dir, 3, extent); /* Location of Extent */
bp_set_long_bbo(dir, 11, size); /* Data length of file section */
set_binary_date(dir, 19, /* Binary date rep of creation time */
year,month,day,hour,minute,second,gmt_offset);
bp_set_byte(dir, 26, 0); /* File flags (we are a file) */
bp_set_byte(dir, 27, 0); /* File unit size if interleaved */
bp_set_byte(dir, 28, 0); /* Interleave gap size */
bp_set_short_bbo(dir, 29, 1); /* Volume sequence number */
bp_set_byte(dir, 33, sl); /* Length of file identifier */
bp_set_string(dir, filename, 34, 34+sl); /* File name */
}
static void add_d1_file_record(IsoDir *iso_dir, char *filename, guint64 size, int extent,
int year, int month, int day,
int hour, int minute, int second, int gmt_offset)
{ unsigned char *dir = iso_dir->dir + iso_dir->tail;
int sl = 2*strlen(filename);
int entry_len = 34+sl;
iso_dir->tail += entry_len;
bp_set_byte(dir, 1, entry_len); /* Length of directory record */
bp_set_byte(dir, 2, 0); /* Extended attribute length */
bp_set_long_bbo(dir, 3, extent); /* Location of Extent */
bp_set_long_bbo(dir, 11, size); /* Data length of file section */
set_binary_date(dir, 19, /* Binary date rep of creation time */
year,month,day,hour,minute,second,gmt_offset);
bp_set_byte(dir, 26, 0); /* File flags (we are a file) */
bp_set_byte(dir, 27, 0); /* File unit size if interleaved */
bp_set_byte(dir, 28, 0); /* Interleave gap size */
bp_set_short_bbo(dir, 29, 1); /* Volume sequence number */
bp_set_byte(dir, 33, sl); /* Length of file identifier */
bp_set_d1_string(dir, filename, 34, 34+sl); /* File name */
}
/*
* Path tables
*/
static IsoPathTable* create_iso_path_table()
{ IsoPathTable *ipt = g_malloc0(sizeof(IsoPathTable));
ipt->lpath = g_malloc0(2048);
ipt->mpath = g_malloc0(2048);
ipt->nSectors = 1;
return ipt;
}
static void free_iso_path_table(IsoPathTable *ipt)
{ g_free(ipt->lpath);
g_free(ipt->mpath);
g_free(ipt);
}
static void add_path(IsoPathTable *ipt, int extent)
{ unsigned char *lpath = ipt->lpath + ipt->tail;
unsigned char *mpath = ipt->mpath + ipt->tail;
bp_set_byte(lpath, 1, 1); /* Length of directory identifier (root=1) */
bp_set_byte(mpath, 1, 1);
bp_set_byte(lpath, 2, 0); /* Extended attribute length */
bp_set_byte(mpath, 2, 0); /* Extended attribute length */
bp_set_long_lsb(lpath, 3, extent); /* Location of extent */
bp_set_long_msb(mpath, 3, extent);
bp_set_short_lsb(lpath, 7, 1); /* Parent directory number */
bp_set_short_msb(mpath, 7, 1);
bp_set_byte(lpath, 9, 0); /* Directory identifier (root=0) */
bp_set_byte(mpath, 9, 0);
}
/*
* Initialize the IsoHeader structure
*/
IsoHeader* InitIsoHeader(void)
{ IsoHeader *ih = g_malloc0(sizeof(IsoHeader));
unsigned char *pvd,*svd;
char blank[128], string[128];
memset(blank, ' ', 128);
/*** Initialize primary volume descriptor (sector 16). */
ih->pvd = pvd = g_malloc0(2048);
ih->dirSectors = 1;
/* 1..8: Standard identifier */
bp_set_byte(pvd, 1, 1); /* Volume descriptor type 1 */
bp_set_string(pvd, "CD001", 2, 6); /* Standard identifier */
bp_set_byte(pvd, 7, 1); /* Volume descriptor version 1 */
/* 9..40: System identifier */
bp_set_string(pvd, blank, 9, 40);
/* 41..72: Volume identifier */
memcpy(string, blank, 128);
memcpy(string, "RANDOM IMAGE", 12);
bp_set_string(pvd, string, 41, 72);
/* 73.. 80: Unused, zero bytes */
/* 81.. 88: Volume space size, filled in at WriteIsoHeader() */
/* 89..120: Unused, zero bytes */
/* 121..124: Volume set size */
bp_set_short_bbo(pvd, 121, 1);
/* 125..128: Volume sequence number */
bp_set_short_bbo(pvd, 125, 1);
/* 129..132: Logical block size */
bp_set_short_bbo(pvd, 129, 2048);
/* 133..140: Path table size, filled in at WriteIsoHeader() */
/* 141..144: L Path table location, filled in at WriteIsoHeader() */
/* 145..148: Optional L Path table location, filled in at WriteIsoHeader() */
/* 149..152: M Path table location, filled in at WriteIsoHeader() */
/* 153..156: Optional M Path table location, filled in at WriteIsoHeader() */
/* 157..190: Directory record for root dir, filled in at WriteIsoHeader() */
/* 191..318: Volume set identifier */
bp_set_string(pvd, blank, 191, 318);
/* 319..446: Publisher identifier */
bp_set_string(pvd, blank, 319, 446);
/* 447..574: Data preparer identifier */
bp_set_string(pvd, blank, 447, 574);
/* 575..702 Application Identfier */
bp_set_string(pvd, blank, 575, 702);
/* 703..739 Copyright File Identifier */
bp_set_string(pvd, blank, 703, 739);
/* 740..776 Abstract File Identifier */
bp_set_string(pvd, blank, 740, 776);
/* 777..813 Bibliographic File Identifier */
bp_set_string(pvd, blank, 777, 813);
/* 814..830 Volume creation time, filled in by WriteIsoHeader() */
/* 831..847 Volume modification time, filled in by WriteIsoHeader() */
/* 848..864 Volume expiration time, filled in by WriteIsoHeader() */
/* 865..881 Volume effective time, filled in by WriteIsoHeader() */
/* 882 File structure version */
bp_set_byte(pvd, 882, 1);
/* 883 Reserved, zero */
/* 884..1395 for application use */
/* 1396..2048 Reserved, zero */
/*** Initialize supplementary volume descriptor (sector 17). */
ih->svd = svd = g_malloc0(2048);
ih->dirSectors = 2;
/* 1..8: Standard identifier */
bp_set_byte(svd, 1, 2); /* Volume descriptor type 1 */
bp_set_string(svd, "CD001", 2, 6); /* Standard identifier */
bp_set_byte(svd, 7, 1); /* Volume descriptor version 1 */
bp_set_byte(svd, 8, 0); /* Volume flags */
/* 9..40: System identifier (zero filled) */
/* 41..72: Volume identifier */
bp_set_d1_string(svd, "random image", 41, 72);
/* 73.. 80: Unused, zero bytes */
/* 81.. 88: Volume space size, filled in at WriteIsoHeader() */
/* 89..120: Escape sequences */
bp_set_byte(svd, 89, 37);
bp_set_byte(svd, 90, 47);
bp_set_byte(svd, 91, 64);
/* 121..124: Volume set size */
bp_set_short_bbo(svd, 121, 1);
/* 125..128: Volume sequence number */
bp_set_short_bbo(svd, 125, 1);
/* 129..132: Logical block size */
bp_set_short_bbo(svd, 129, 2048);
/* 133..140: Path table size, filled in at WriteIsoHeader() */
/* 141..144: L Path table location, filled in at WriteIsoHeader() */
/* 145..148: Optional L Path table location, filled in at WriteIsoHeader() */
/* 149..152: M Path table location, filled in at WriteIsoHeader() */
/* 153..156: Optional M Path table location, filled in at WriteIsoHeader() */
/* 157..190: Directory record for root dir, filled in at WriteIsoHeader() */
/* The standard says to fill the identifier field with blanks,
but actual writing software seems to use zeroes. */
/* 191..318: Volume set identifier */
//bp_set_string(svd, blank, 191, 318);
/* 319..446: Publisher identifier */
//bp_set_string(svd, blank, 319, 446);
/* 447..574: Data preparer identifier */
//bp_set_string(svd, blank, 447, 574);
/* 575..702 Application Identfier */
//bp_set_string(svd, blank, 575, 702);
/* 703..739 Copyright File Identifier */
//bp_set_string(svd, blank, 703, 739);
/* 740..776 Abstract File Identifier */
//bp_set_string(svd, blank, 740, 776);
/* 777..813 Bibliographic File Identifier */
//bp_set_string(svd, blank, 777, 813);
/* 814..830 Volume creation time, filled in by WriteIsoHeader() */
/* 831..847 Volume modification time, filled in by WriteIsoHeader() */
/* 848..864 Volume expiration time, filled in by WriteIsoHeader() */
/* 865..881 Volume effective time, filled in by WriteIsoHeader() */
/* 882 File structure version */
bp_set_byte(svd, 882, 1);
/* 883 Reserved, zero */
/* 884..1395 for application use */
/* 1396..2048 Reserved, zero */
/*** The volume descriptor set terminator (sector 17)
is trivial and created during WriteIsoHeader() */
ih->dirSectors = 3;
/*** Allocate space for directories and path tables */
ih->proot = create_iso_dir();
add_directory_record(ih->proot, 21, 2, 0,
106, 7, 16, 12, 35, 46, 8);
add_directory_record(ih->proot, 21, 2, 1,
106, 7, 16, 12, 35, 46, 8);
ih->ppath = create_iso_path_table();
add_path(ih->ppath, 21);
ih->sroot = create_iso_dir();
add_directory_record(ih->sroot, 24, 2, 0,
106, 7, 16, 12, 35, 46, 8);
add_directory_record(ih->sroot, 24, 2, 1,
106, 7, 16, 12, 35, 46, 8);
ih->spath = create_iso_path_table();
add_path(ih->spath, 24);
ih->dirSectors += 6;
return ih;
}
void FreeIsoHeader(IsoHeader *ih)
{
free_iso_dir(ih->proot);
free_iso_dir(ih->sroot);
free_iso_path_table(ih->ppath);
free_iso_path_table(ih->spath);
g_free(ih->pvd);
g_free(ih->svd);
g_free(ih);
}
/*
* Add file to iso image (works currently only for one file!)
*/
void AddFile(IsoHeader *ih, char *name, guint64 size)
{ static int n;
char iso[20], joliet[strlen(name+3)];
n++;
sprintf(iso,"RAN_%04d.DAT;1", n);
add_file_record(ih->proot, iso, size, 25,
106, 7, 16, 12, 28, 10, 8);
sprintf(joliet,"%s;1", name);
add_d1_file_record(ih->sroot, joliet, size, 25,
106, 7, 16, 12, 28, 10, 8);
ih->volumeSpace += (size+2047)/2048;
}
/*
* Write out the IsoHeader, return number of sectors written
*/
void WriteIsoHeader(IsoHeader *ih, LargeFile *image)
{ unsigned char zero[2048], sector[2048];
unsigned char *pvd,*svd;
int i;
/* The first 16 sectors are zeroed out */
memset(zero, 0, 2048);
for(i=0; i<16; i++)
{ int n = LargeWrite(image, zero, 2048);
if(n != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)i, strerror(errno));
}
/* Complete the primary volume descriptor */
pvd = ih->pvd;
/* 81..88: Volume space size */
ih->volumeSpace += 16 + ih->dirSectors;
bp_set_long_bbo(pvd, 81, ih->volumeSpace);
/* 133..140: Path table size, Fixme: use real values */
/* 141..144: L Path table location */
/* 145..148: Optional L Path table location */
/* 149..152: M Path table location */
/* 153..156: Optional M Path table location */
bp_set_long_bbo(pvd, 133, 10);
bp_set_long_lsb(pvd, 141, 19);
bp_set_long_lsb(pvd, 145, 0);
bp_set_long_msb(pvd, 149, 20);
bp_set_long_msb(pvd, 153, 0);
/* 157..190: Directory record for root directory, Fixme: use real values */
bp_set_byte(pvd, 157, 34); /* Length of directory record */
bp_set_byte(pvd, 158, 0); /* Extended atribute length */
bp_set_long_bbo(pvd, 159, 21); /* Location of Extent */
bp_set_long_bbo(pvd, 167, 2048); /* Data length of file section */
set_binary_date(pvd, 175, /* Binary date rep of creation time */
106, 7, 16, 10, 35, 46, 8);
bp_set_byte(pvd, 182, 2); /* File flags (we are a directory) */
bp_set_byte(pvd, 183, 0); /* File unit size if interleaved */
bp_set_byte(pvd, 184, 0); /* Interleave gap size */
bp_set_short_bbo(pvd, 185, 1); /* Volume sequence number */
bp_set_byte(pvd, 189, 1); /* Length of file identifier */
bp_set_byte(pvd, 190, 0); /* File identifier */
/* 814..830 Volume creation time */
set_date(pvd, 814, 2006, 7, 16, 10, 35, 46, 23, 8);
/* 831..847 Volume modification time */
set_date(pvd, 831, 2006, 7, 16, 10, 35, 46, 23, 8);
/* 848..864 Volume expiration time */
set_date(pvd, 848, 2106, 7, 16, 10, 35, 46, 23, 8);
/* 865..881 Volume effective time */
set_date(pvd, 865, 2006, 7, 16, 10, 35, 46, 23, 8);
/* Write the pvd */
if(LargeWrite(image, pvd, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)16, strerror(errno));
/* Create the supplementary volume descriptor */
svd = ih->svd;
/* 81..88: Volume space size */
bp_set_long_bbo(svd, 81, ih->volumeSpace);
/* 133..140: Path table size, Fixme: use real values */
/* 141..144: L Path table location */
/* 145..148: Optional L Path table location */
/* 149..152: M Path table location */
/* 153..156: Optional M Path table location */
bp_set_long_bbo(svd, 133, 10);
bp_set_long_lsb(svd, 141, 22);
bp_set_long_lsb(svd, 145, 0);
bp_set_long_msb(svd, 149, 23);
bp_set_long_msb(svd, 153, 0);
/* 157..190: Directory record for root directory, Fixme: use real values */
bp_set_byte(svd, 157, 34); /* Length of directory record */
bp_set_byte(svd, 158, 0); /* Extended attribute length */
bp_set_long_bbo(svd, 159, 24); /* Location of Extent */
bp_set_long_bbo(svd, 167, 2048); /* Data length of file section */
set_binary_date(svd, 175, /* Binary date rep of creation time */
106, 7, 16, 10, 35, 46, 8);
bp_set_byte(svd, 182, 2); /* File flags (we are a directory) */
bp_set_byte(svd, 183, 0); /* File unit size if interleaved */
bp_set_byte(svd, 184, 0); /* Interleave gap size */
bp_set_short_bbo(svd, 185, 1); /* Volume sequence number */
bp_set_byte(svd, 189, 1); /* Length of file identifier */
bp_set_byte(svd, 190, 0); /* File identifier */
/* 814..830 Volume creation time */
set_date(svd, 814, 2006, 7, 16, 10, 35, 46, 23, 8);
/* 831..847 Volume modification time */
set_date(svd, 831, 2006, 7, 16, 10, 35, 46, 23, 8);
/* 848..864 Volume expiration time */
set_date(svd, 848, 2106, 7, 16, 10, 35, 46, 23, 8);
/* 865..881 Volume effective time */
set_date(svd, 865, 2006, 7, 16, 10, 35, 46, 23, 8);
/* Write the svd */
if(LargeWrite(image, svd, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)17, strerror(errno));
/*** Create and write the volume descriptor set terminator */
/* 1..8: Standard identifier */
memset(sector, 0, 2048);
bp_set_byte(sector, 1, 255); /* Volume descriptor set terminator */
bp_set_string(sector, "CD001", 2, 6); /* Standard identifier */
bp_set_byte(sector, 7, 1); /* Volume descriptor version 1 */
if(LargeWrite(image, sector, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)18, strerror(errno));
/*** Write the primary and supplementary path tables and root directories */
if(LargeWrite(image, ih->ppath->lpath, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)19, strerror(errno));
if(LargeWrite(image, ih->ppath->mpath, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)20, strerror(errno));
if(LargeWrite(image, ih->proot->dir, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)21, strerror(errno));
if(LargeWrite(image, ih->spath->lpath, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)22, strerror(errno));
if(LargeWrite(image, ih->spath->mpath, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)23, strerror(errno));
if(LargeWrite(image, ih->sroot->dir, 2048) != 2048)
Stop(_("Failed writing to sector %lld in image: %s"), (gint64)24, strerror(errno));
}
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