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/*
* ghb-dvd.c
* Copyright (C) John Stebbins 2008-2020 <stebbins@stebbins>
*
* ghb-dvd.c is free software.
*
* You may redistribute it and/or modify it under the terms of the
* GNU General Public License version 2, as published by the Free Software
* Foundation.
*
* ghb-dvd.c 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 main.c. If not, write to:
* The Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301, USA.
*/
#if defined(_WIN32)
#include <windows.h>
#endif
#include <glib.h>
#include <gio/gio.h>
#include "ghb-dvd.h"
#if 0
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#ifndef PACKED
#define PACKED __attribute__((packed))
#endif
struct volume_descriptor {
struct descriptor_tag {
guint16 id;
guint16 version;
guint8 checksum;
guint8 reserved;
guint16 serial;
guint16 crc;
guint16 crc_len;
guint32 location;
} PACKED tag;
union {
struct anchor_descriptor {
guint32 length;
guint32 location;
} PACKED anchor;
struct primary_descriptor {
guint32 seq_num;
guint32 desc_num;
struct dstring {
guint8 clen;
guint8 c[31];
} PACKED ident;
} PACKED primary;
} PACKED type;
} PACKED;
struct volume_structure_descriptor {
guint8 type;
guint8 id[5];
guint8 version;
} PACKED;
#define VOLUME_ID_LABEL_SIZE 64
typedef struct
{
gint fd;
gchar label[VOLUME_ID_LABEL_SIZE+1];
} udf_info_t;
enum endian {
LE = 0,
BE = 1
};
#ifdef __BYTE_ORDER
#if (__BYTE_ORDER == __LITTLE_ENDIAN)
#define le16_to_cpu(x) (x)
#define le32_to_cpu(x) (x)
#define le64_to_cpu(x) (x)
#define be16_to_cpu(x) bswap_16(x)
#define be32_to_cpu(x) bswap_32(x)
#define cpu_to_le16(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_be32(x) bswap_32(x)
#elif (__BYTE_ORDER == __BIG_ENDIAN)
#define le16_to_cpu(x) bswap_16(x)
#define le32_to_cpu(x) bswap_32(x)
#define le64_to_cpu(x) bswap_64(x)
#define be16_to_cpu(x) (x)
#define be32_to_cpu(x) (x)
#define cpu_to_le16(x) bswap_16(x)
#define cpu_to_le32(x) bswap_32(x)
#define cpu_to_be32(x) (x)
#endif
#endif /* __BYTE_ORDER */
#define UDF_VSD_OFFSET 0x8000
static guint8*
get_buffer(int fd, guint64 off, gsize len)
{
gint buf_len;
if (lseek(fd, off, SEEK_SET) < 0)
{
return NULL;
}
guint8 *buffer = g_malloc(len);
buf_len = read(fd, buffer, len);
if (buf_len < 0)
{
g_free(buffer);
return NULL;
}
return buffer;
}
static gint
set_unicode16(guint8 *str, gsize len, const guint8 *buf, gint endianess, gsize count)
{
gint ii, jj;
guint16 c;
jj = 0;
for (ii = 0; ii + 2 <= count; ii += 2) {
if (endianess == LE)
c = (buf[ii+1] << 8) | buf[ii];
else
c = (buf[ii] << 8) | buf[ii+1];
if (c == 0) {
str[jj] = '\0';
break;
} else if (c < 0x80) {
if (jj+1 >= len)
break;
str[jj++] = (guint8) c;
} else if (c < 0x800) {
if (jj+2 >= len)
break;
str[jj++] = (guint8) (0xc0 | (c >> 6));
str[jj++] = (guint8) (0x80 | (c & 0x3f));
} else {
if (jj+3 >= len)
break;
str[jj++] = (guint8) (0xe0 | (c >> 12));
str[jj++] = (guint8) (0x80 | ((c >> 6) & 0x3f));
str[jj++] = (guint8) (0x80 | (c & 0x3f));
}
}
str[jj] = '\0';
return jj;
}
static void
set_label_string(guint8 *str, const guint8 *buf, gsize count)
{
gint ii;
memcpy(str, buf, count);
str[count] = 0;
/* remove trailing whitespace */
ii = strlen((gchar*)str);
while (ii--)
{
if (!g_ascii_isspace(str[ii]))
break;
}
str[ii+1] = 0;
}
static gint
probe_udf(udf_info_t *id)
{
struct volume_descriptor *vd;
struct volume_structure_descriptor *vsd;
guint bs;
guint b;
guint type;
guint count;
guint loc;
guint clen;
guint64 off = 0;
vsd = (struct volume_structure_descriptor *) get_buffer(id->fd, off + UDF_VSD_OFFSET, 0x200);
if (vsd == NULL)
return -1;
if (memcmp(vsd->id, "NSR02", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "NSR03", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "BEA01", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "BOOT2", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "CD001", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "CDW02", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "TEA03", 5) == 0)
goto blocksize;
return -1;
blocksize:
/* search the next VSD to get the logical block size of the volume */
for (bs = 0x800; bs < 0x8000; bs += 0x800) {
vsd = (struct volume_structure_descriptor *) get_buffer(id->fd, off + UDF_VSD_OFFSET + bs, 0x800);
if (vsd == NULL)
return -1;
if (vsd->id[0] != '\0')
goto nsr;
}
return -1;
nsr:
/* search the list of VSDs for a NSR descriptor */
for (b = 0; b < 64; b++) {
vsd = (struct volume_structure_descriptor *) get_buffer(id->fd, off + UDF_VSD_OFFSET + (b * bs), 0x800);
if (vsd == NULL)
return -1;
if (vsd->id[0] == '\0')
return -1;
if (memcmp(vsd->id, "NSR02", 5) == 0)
goto anchor;
if (memcmp(vsd->id, "NSR03", 5) == 0)
goto anchor;
}
return -1;
anchor:
/* read anchor volume descriptor */
vd = (struct volume_descriptor *) get_buffer(id->fd, off + (256 * bs), 0x200);
if (vd == NULL)
return -1;
type = le16_to_cpu(vd->tag.id);
if (type != 2) /* TAG_ID_AVDP */
goto found;
/* get descriptor list address and block count */
count = le32_to_cpu(vd->type.anchor.length) / bs;
loc = le32_to_cpu(vd->type.anchor.location);
/* pick the primary descriptor from the list */
for (b = 0; b < count; b++) {
vd = (struct volume_descriptor *) get_buffer(id->fd, off + ((loc + b) * bs), 0x200);
if (vd == NULL)
return -1;
type = le16_to_cpu(vd->tag.id);
/* check validity */
if (type == 0)
goto found;
if (le32_to_cpu(vd->tag.location) != loc + b)
goto found;
if (type == 1) /* TAG_ID_PVD */
goto pvd;
}
goto found;
pvd:
clen = vd->type.primary.ident.clen;
if (clen == 8)
set_label_string((guint8*)id->label, vd->type.primary.ident.c, 31);
else if (clen == 16)
set_unicode16((guint8*)id->label, sizeof(id->label), vd->type.primary.ident.c, BE, 31);
found:
return 0;
}
gchar*
ghb_dvd_volname(const gchar *device)
{
udf_info_t id;
gchar *buffer = NULL;
id.fd = open(device, O_RDONLY);
if (id.fd < 0) {
return NULL;
}
if (probe_udf (&id) == 0)
{
buffer = g_strdup(id.label);
}
return buffer;
}
#endif
gchar*
ghb_resolve_symlink(const gchar *name)
{
gchar *file;
GFileInfo *info;
GFile *gfile;
gfile = g_file_new_for_path(name);
info = g_file_query_info(gfile,
G_FILE_ATTRIBUTE_STANDARD_NAME ","
G_FILE_ATTRIBUTE_STANDARD_SYMLINK_TARGET ","
G_FILE_ATTRIBUTE_STANDARD_IS_SYMLINK,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
while ((info != NULL) && g_file_info_get_is_symlink(info))
{
GFile *parent;
const gchar *target;
parent = g_file_get_parent(gfile);
g_object_unref(gfile);
target = g_file_info_get_symlink_target(info);
gfile = g_file_resolve_relative_path(parent, target);
g_object_unref(parent);
g_object_unref(info);
info = g_file_query_info(gfile,
G_FILE_ATTRIBUTE_STANDARD_NAME ","
G_FILE_ATTRIBUTE_STANDARD_SYMLINK_TARGET ","
G_FILE_ATTRIBUTE_STANDARD_IS_SYMLINK,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
}
if (info != NULL)
{
file = g_file_get_path(gfile);
g_object_unref(info);
}
else
{
file = g_strdup(name);
}
g_object_unref(gfile);
return file;
}
void
ghb_dvd_set_current(const gchar *name, signal_user_data_t *ud)
{
#if !defined(_WIN32)
GFile *gfile;
GFileInfo *info;
gchar *resolved = ghb_resolve_symlink(name);
if (ud->current_dvd_device != NULL)
{
g_free(ud->current_dvd_device);
ud->current_dvd_device = NULL;
}
gfile = g_file_new_for_path(resolved);
info = g_file_query_info(gfile,
G_FILE_ATTRIBUTE_STANDARD_TYPE,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
if (info != NULL)
{
if (g_file_info_get_file_type(info) == G_FILE_TYPE_SPECIAL)
{
// I could go through the trouble to scan the connected drives and
// verify that this device is connected and is a DVD. But I don't
// think its necessary.
ud->current_dvd_device = resolved;
}
else
{
g_free(resolved);
}
g_object_unref(info);
}
else
{
g_free(resolved);
}
g_object_unref(gfile);
#else
gchar drive[4];
guint dtype;
if (ud->current_dvd_device != NULL)
{
g_free(ud->current_dvd_device);
ud->current_dvd_device = NULL;
}
g_strlcpy(drive, name, 4);
dtype = GetDriveType(drive);
if (dtype == DRIVE_CDROM)
{
ud->current_dvd_device = g_strdup(name);
}
#endif
}
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