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238 lines
4.7 KiB
C
238 lines
4.7 KiB
C
/*
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*
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* (c) 2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "libstream.h"
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#ifdef FLOPPY_SUPPORT
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#include <libfloppy.h>
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#endif
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#ifdef SCSI_SUPPORT
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#include <libscsi.h>
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#endif
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#ifdef BLOCK_SUPPORT
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#include <libblock.h>
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#endif
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#ifdef CONTAINER_SUPPORT
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#include <libcontainer.h>
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#endif
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#ifdef ISO9660_SUPPORT
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#include <libiso9660.h>
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#endif
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typedef enum {
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device_FLOPPY,
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device_SCSI,
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} device_t;
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typedef enum {
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fs_BLOCK,
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fs_CONTAINER,
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fs_ISO9660,
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} fs_t;
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static char* get_fs(char *path, fs_t *fs)
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{
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if (strncmp("block:", path, 6) == 0)
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{
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*fs = fs_BLOCK;
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return path + 6;
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}
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if (strncmp("container:", path, 10) == 0)
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{
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*fs = fs_CONTAINER;
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return path + 10;
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}
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if (strncmp("iso9660:", path, 8) == 0)
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{
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*fs = fs_ISO9660;
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return path + 8;
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}
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return NULL;
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}
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static char *get_device(char* path,
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device_t *device, int *unit, int* partition)
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{
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int nb;
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if (*path != '(')
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return NULL;
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path++;
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if (strncmp("fd", path, 2) == 0) {
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*device = device_FLOPPY;
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path += 2;
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} else if (strncmp("sd", path, 2) == 0) {
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*device = device_SCSI;
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path += 2;
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} else
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return NULL;
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nb = 0;
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while ( (*path >= '0') && (*path <= '9') ) {
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nb = (nb * 10) + (*path - '0');
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path++;
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}
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*unit = nb;
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*partition = -1;
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if ( (*path == 0) || (*path == ')') )
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{
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path++;
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return path;
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}
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if (*path != ',')
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return NULL;
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path++;
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nb = 0;
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while ( (*path >= '0') && (*path <= '9') ) {
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nb = (nb * 10) + (*path - '0');
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path++;
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}
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*partition = nb;
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if ( (*path == 0) || (*path == ')') )
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{
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path++;
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return path;
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}
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return NULL;
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}
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stream_t *stream_open(char *dev)
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{
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stream_t *stream;
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fs_t fs;
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device_t device;
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int unit, partition;
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char *current;
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current = get_fs(dev, &fs);
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if (current == NULL)
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{
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printf("Cannot identify given filesystem\n");
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return NULL;
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}
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current = get_device(current, &device, &unit, &partition);
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if (current == NULL)
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{
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printf("Cannot identify given device\n");
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return NULL;
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}
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stream = (stream_t*)malloc(sizeof(stream_t));
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switch(device)
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{
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#ifdef FLOPPY_SUPPORT
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case device_FLOPPY:
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if (partition != -1)
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{
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free(stream);
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return NULL;
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}
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stream->device.data = floppy_open(unit);
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if (stream->device.data == NULL)
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{
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free(stream);
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return NULL;
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}
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stream->device.read_sector =
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(stream_read_sector_t)floppy_read_sector;
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stream->device.close = (stream_close_t)floppy_close;
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stream->device.get_blocksize =
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(stream_get_blocksize_t)floppy_get_blocksize;
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break;
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#endif /* FLOPPY_SUPPORT */
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#ifdef SCSI_SUPPORT
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case device_SCSI:
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stream->device.data = scsi_open(unit);
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if (stream->device.data == NULL)
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{
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free(stream);
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return NULL;
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}
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stream->device.read_sector =
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(stream_read_sector_t)scsi_read_sector;
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stream->device.close = (stream_close_t)scsi_close;
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stream->device.get_blocksize =
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(stream_get_blocksize_t)scsi_get_blocksize;
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break;
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#endif /* SCSI_SUPPORT */
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default:
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free(stream);
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return NULL;
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break;
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}
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switch(fs)
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{
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#ifdef BLOCK_SUPPORT
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case fs_BLOCK:
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stream->fs.volume = NULL;
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stream->fs.file = block_open(&stream->device, current);
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if (stream->fs.file == NULL)
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goto outfs;
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stream->fs.read = (stream_read_t)block_read;
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stream->fs.lseek = (stream_lseek_t)block_lseek;
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stream->fs.close = (stream_close_t)block_close;
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stream->fs.umount = NULL;
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stream->fs.fstat = (stream_fstat_t)block_fstat;
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break;
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#endif /* BLOCK_SUPPORT */
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#ifdef CONTAINER_SUPPORT
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case fs_CONTAINER:
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stream->fs.volume = NULL;
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stream->fs.file = container_open(&stream->device, current);
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if (stream->fs.file == NULL)
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goto outfs;
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stream->fs.read = (stream_read_t)container_read;
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stream->fs.lseek = (stream_lseek_t)container_lseek;
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stream->fs.close = (stream_close_t)container_close;
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stream->fs.umount = NULL;
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stream->fs.fstat = (stream_fstat_t)container_fstat;
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break;
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#endif /* CONTAINER_SUPPORT */
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#ifdef ISO9660_SUPPORT
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case fs_ISO9660:
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stream->fs.volume = iso9660_mount(&stream->device);
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if (stream->fs.volume == NULL)
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{
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printf("Cannot mount volume ISO9660\n");
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goto outfs;
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}
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stream->fs.file = iso9660_open(stream->fs.volume, current);
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if (stream->fs.file == NULL)
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{
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iso9660_umount(stream->fs.volume);
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goto outfs;
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}
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stream->fs.read = (stream_read_t)iso9660_read;
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stream->fs.lseek = (stream_lseek_t)iso9660_lseek;
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stream->fs.close = (stream_close_t)iso9660_close;
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stream->fs.umount = (stream_umount_t)iso9660_umount;
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stream->fs.fstat = (stream_fstat_t)iso9660_fstat;
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break;
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#endif /* ISO9660_SUPPORT */
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default:
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outfs:
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stream->device.close(stream->device.data);
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free(stream);
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return NULL;
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}
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return stream;
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}
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