Initial working iso9660 disk scanner fs module
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2325 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Tyler Dauwalder
parent
18940d3246
commit
22aef14b93
264
src/add-ons/kernel/disk_scanner/fs/iso9660.c
Normal file
264
src/add-ons/kernel/disk_scanner/fs/iso9660.c
Normal file
@ -0,0 +1,264 @@
|
||||
// iso9660.c
|
||||
|
||||
#include <errno.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include <fs_device.h>
|
||||
#include <KernelExport.h>
|
||||
#include <disk_scanner/fs.h>
|
||||
|
||||
#define TRACE(x)
|
||||
//#define TRACE(x) dprintf x
|
||||
|
||||
// misc constants
|
||||
#define ISO9660_FS_MODULE_NAME "disk_scanner/fs/iso9660/v1"
|
||||
static const char *kModuleDebugName = "fs/iso9660";
|
||||
static const char *kISO9660Signature = "CD001";
|
||||
static const uint32 kVolumeDescriptorLength = 2048;
|
||||
#define ISO9660_VOLUME_IDENTIFIER_LENGTH 32
|
||||
|
||||
typedef struct iso9660_common_volume_descriptor {
|
||||
uchar volume_descriptor_type;
|
||||
uchar standard_identifier[5]; // should be 'CD001'
|
||||
uchar volume_descriptor_version;
|
||||
// Remaining bytes are unused
|
||||
} iso9660_common_volume_descriptor;
|
||||
|
||||
typedef struct iso9660_primary_volume_descriptor {
|
||||
iso9660_common_volume_descriptor info;
|
||||
uchar volume_flags;
|
||||
uchar system_identifier[32];
|
||||
uchar volume_identifier[ISO9660_VOLUME_IDENTIFIER_LENGTH];
|
||||
// Remaining bytes are disinteresting to us
|
||||
} iso9660_primary_volume_descriptor;
|
||||
|
||||
// volume descriptor types
|
||||
typedef enum {
|
||||
ISO9660VD_BOOT,
|
||||
ISO9660VD_PRIMARY,
|
||||
ISO9660VD_SUPPLEMENTARY,
|
||||
ISO9660VD_PARTITION,
|
||||
ISO9660VD_TERMINATOR = 255
|
||||
} iso9660_volume_descriptor_type;
|
||||
|
||||
static
|
||||
const char*
|
||||
volume_descriptor_type_to_string(iso9660_volume_descriptor_type type)
|
||||
{
|
||||
switch (type) {
|
||||
case ISO9660VD_BOOT: return "boot";
|
||||
case ISO9660VD_PRIMARY: return "primary";
|
||||
case ISO9660VD_SUPPLEMENTARY: return "supplementary";
|
||||
case ISO9660VD_PARTITION: return "partiton";
|
||||
case ISO9660VD_TERMINATOR: return "terminator";
|
||||
default: return "invalid";
|
||||
}
|
||||
}
|
||||
|
||||
static
|
||||
void
|
||||
dump_common_volume_descriptor(iso9660_common_volume_descriptor *common, const char *indent,
|
||||
bool print_header)
|
||||
{
|
||||
if (print_header)
|
||||
TRACE(("%siso9660_common_volume_descriptor:\n", indent));
|
||||
|
||||
TRACE(("%s volume_descriptor_type == %d (%s)\n", indent,
|
||||
common->volume_descriptor_type,
|
||||
volume_descriptor_type_to_string(common->volume_descriptor_type)));
|
||||
TRACE(("%s standard_identifier == %.5s (%s)\n", indent, common->standard_identifier,
|
||||
strncmp(common->standard_identifier, kISO9660Signature, 5) == 0 ? "valid" : "INVALID"));
|
||||
TRACE(("%s volume_descriptor_version == %d\n", indent, common->volume_descriptor_version));
|
||||
}
|
||||
|
||||
static
|
||||
void
|
||||
dump_primary_volume_descriptor(iso9660_primary_volume_descriptor *primary, const char *indent,
|
||||
bool print_header)
|
||||
{
|
||||
if (print_header)
|
||||
TRACE(("%siso9660_primary_volume_descriptor:\n", indent));
|
||||
|
||||
dump_common_volume_descriptor(&(primary->info), indent, false);
|
||||
TRACE(("%s volume_identifier == %.32s\n", indent,
|
||||
primary->volume_identifier));
|
||||
}
|
||||
|
||||
static
|
||||
status_t
|
||||
check_common_volume_descriptor(iso9660_common_volume_descriptor *common)
|
||||
{
|
||||
status_t error = common ? B_OK : B_BAD_VALUE;
|
||||
if (!error)
|
||||
error = strncmp(common->standard_identifier, kISO9660Signature,
|
||||
5) == 0 ? B_OK : B_BAD_DATA;
|
||||
return error;
|
||||
}
|
||||
|
||||
// std_ops
|
||||
static
|
||||
status_t
|
||||
std_ops(int32 op, ...)
|
||||
{
|
||||
TRACE(("%s: std_ops(0x%lx)\n", kModuleDebugName, op));
|
||||
switch(op) {
|
||||
case B_MODULE_INIT:
|
||||
case B_MODULE_UNINIT:
|
||||
return B_OK;
|
||||
}
|
||||
return B_ERROR;
|
||||
}
|
||||
|
||||
// read_block
|
||||
static
|
||||
status_t
|
||||
read_block(int fd, off_t offset, size_t size, uchar **block)
|
||||
{
|
||||
status_t error = (block && size > 0 ? B_OK : B_BAD_VALUE);
|
||||
if (error == B_OK) {
|
||||
*block = malloc(size);
|
||||
if (*block) {
|
||||
if (read_pos(fd, offset, *block, size) != (ssize_t)size) {
|
||||
error = errno;
|
||||
if (error == B_OK)
|
||||
error = B_ERROR;
|
||||
free(*block);
|
||||
*block = NULL;
|
||||
}
|
||||
} else
|
||||
error = B_NO_MEMORY;
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
||||
// iso9660_fs_identify
|
||||
/*! \brief Returns true if the given partition is a valid iso9660 partition.
|
||||
|
||||
See fs_identify_hook() for more information.
|
||||
|
||||
\todo Fill in partitionInfo->mounted_at with something useful.
|
||||
*/
|
||||
static
|
||||
bool
|
||||
iso9660_fs_identify(int deviceFD, struct extended_partition_info *partitionInfo,
|
||||
float *priority)
|
||||
{
|
||||
bool result = false;
|
||||
uchar *buffer = NULL;
|
||||
uint32 blockSize = partitionInfo->info.logical_block_size;
|
||||
bool exit = false;
|
||||
off_t offset = partitionInfo->info.offset + 16*blockSize;
|
||||
status_t error = B_OK;
|
||||
|
||||
TRACE(("%s: identify(%d, %p)\n", kModuleDebugName, deviceFD,
|
||||
partitionInfo));
|
||||
|
||||
// Read through the volume descriptors looking for a primary descriptor.
|
||||
// If for some reason there are more than one primary descriptor, the
|
||||
// volume name from the last encountered descriptor will be used.
|
||||
while (!error && !exit) {
|
||||
iso9660_common_volume_descriptor *common = NULL;
|
||||
|
||||
// Read the block containing the current descriptor
|
||||
error = read_block(deviceFD, offset, blockSize, &buffer);
|
||||
offset += blockSize;
|
||||
if (!error) {
|
||||
common = (iso9660_common_volume_descriptor*)buffer;
|
||||
error = check_common_volume_descriptor(common);
|
||||
}
|
||||
|
||||
// Handle each type of descriptor appropriately
|
||||
if (!error) {
|
||||
TRACE(("%s: found %s descriptor\n", kModuleDebugName,
|
||||
volume_descriptor_type_to_string(common->volume_descriptor_type)));
|
||||
|
||||
switch (common->volume_descriptor_type) {
|
||||
case ISO9660VD_BOOT:
|
||||
break;
|
||||
|
||||
case ISO9660VD_PRIMARY:
|
||||
{
|
||||
int i;
|
||||
iso9660_primary_volume_descriptor *primary = (iso9660_primary_volume_descriptor*)buffer;
|
||||
|
||||
dump_primary_volume_descriptor(primary, " ", true);
|
||||
|
||||
if (partitionInfo->file_system_short_name)
|
||||
strcpy(partitionInfo->file_system_short_name, "iso9660");
|
||||
if (partitionInfo->file_system_long_name)
|
||||
strcpy(partitionInfo->file_system_long_name, "iso9660 CD-ROM File System");
|
||||
|
||||
// Cut off any trailing spaces from the volume id. Note
|
||||
// that this allows for spaces INSIDE the volume id, even
|
||||
// though that's not technically allowed by the standard;
|
||||
// this was necessary to support certain RedHat 6.2 CD-ROMs
|
||||
// from a certain Linux company who shall remain unnamed. ;-)
|
||||
for (i = ISO9660_VOLUME_IDENTIFIER_LENGTH-1; i >= 0; i--) {
|
||||
if (primary->volume_identifier[i] != 0x20)
|
||||
break;
|
||||
}
|
||||
if (partitionInfo->volume_name)
|
||||
strncpy(partitionInfo->volume_name, primary->volume_identifier, i+1);
|
||||
|
||||
if (priority)
|
||||
*priority = 0;
|
||||
result = true;
|
||||
break;
|
||||
}
|
||||
|
||||
case ISO9660VD_SUPPLEMENTARY:
|
||||
break;
|
||||
|
||||
case ISO9660VD_PARTITION:
|
||||
break;
|
||||
|
||||
case ISO9660VD_TERMINATOR:
|
||||
exit = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (buffer) {
|
||||
free(buffer);
|
||||
buffer = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
switch (error) {
|
||||
case B_OK:
|
||||
break;
|
||||
|
||||
case B_BAD_DATA:
|
||||
TRACE(("%s: identify: bad signature\n", kModuleDebugName));
|
||||
break;
|
||||
|
||||
default:
|
||||
TRACE(("%s: identify error: 0x%lx\n", kModuleDebugName,
|
||||
error));
|
||||
break;
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static fs_module_info iso9660_fs_module =
|
||||
{
|
||||
// module_info
|
||||
{
|
||||
ISO9660_FS_MODULE_NAME,
|
||||
0, // better B_KEEP_LOADED?
|
||||
std_ops
|
||||
},
|
||||
iso9660_fs_identify,
|
||||
};
|
||||
|
||||
_EXPORT fs_module_info *modules[] =
|
||||
{
|
||||
&iso9660_fs_module,
|
||||
NULL
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user