include/scsi/cdb.h

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#ifndef SCSI_CDB_H_INCLUDED
#define SCSI_CDB_H_INCLUDED

#include <assert.h>
#include <types.h>
#include <unaligned.h>

#include <scsi/spc_protocol.h>

static inline uint16_t scsi_cdb_get_u16(const uint8_t *cdb, unsigned int offset)
{
        return read_unaligned_be16(cdb + offset);
}

static inline uint32_t scsi_cdb_get_u32(const uint8_t *cdb, unsigned int offset)
{
        return read_unaligned_be32(cdb + offset);
}

static inline uint8_t scsi_cdb_get_opcode(const uint8_t *cdb)
{
        return cdb[0];
}

static inline uint8_t scsi_cdb_get_group_code(const uint8_t *cdb)
{
        return scsi_cdb_get_opcode(cdb) >> 5;
}

static inline uint32_t scsi_cdb6_get_lba(const uint8_t *cdb)
{
        uint32_t        lba;

        assert(scsi_cdb_get_group_code(cdb) == 0);

        lba = (uint32_t)(cdb[1] & 0x1f) << 16;
        lba |= (uint32_t)cdb[2] << 8;
        lba |= (uint32_t)cdb[3];

        return lba;
}

static inline uint32_t scsi_cdb10_get_lba(const uint8_t *cdb)
{
        assert(scsi_cdb_get_group_code(cdb) == 1
                        || scsi_cdb_get_group_code(cdb) == 2);

        return scsi_cdb_get_u32(cdb, 2);
}

static inline uint32_t scsi_cdb6_get_xfer_len(const uint8_t *cdb)
{
        uint32_t        len;

        /* REVISIT: This may not be correct for all CDBs, but it does
         * the trick for READx and WRITEx */

        assert(scsi_cdb_get_group_code(cdb) == 0);
        len = cdb[4];
        if (!len)
                len = 256;

        return len;
}


static inline uint32_t scsi_cdb10_get_xfer_len(const uint8_t *cdb)
{
        assert(scsi_cdb_get_group_code(cdb) == 1
                        || scsi_cdb_get_group_code(cdb) == 2);

        return scsi_cdb_get_u16(cdb, 7);
}

static inline uint32_t scsi_cdb6_get_alloc_len(const uint8_t *cdb)
{
        return cdb[4];
}

static inline uint32_t scsi_cdb10_get_alloc_len(const uint8_t *cdb)
{
        return scsi_cdb_get_u16(cdb, 7);
}

static inline bool scsi_cdb10_bytchk_is_set(const uint8_t *cdb)
{
        return cdb[1] & (1 << 1);
}

#endif /* SCSI_CDB_H_INCLUDED */

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