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