139 lines
3.7 KiB
C++
139 lines
3.7 KiB
C++
/* mtinfo.h: Defininitions for the Cygwin tape driver class.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* Maximum number of supported partitions per drive. */
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#define MAX_PARTITION_NUM 64
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/* Maximum number of supported drives. */
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#define MAX_DRIVE_NUM 8
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/* Values for bookkeeping of the tape position relative to filemarks
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and eod/eom. */
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enum eom_val
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{
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no_eof,
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eof_hit,
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eof,
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eod_hit,
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eod,
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eom_hit,
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eom
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};
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enum dirty_state
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{
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clean,
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has_read,
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has_written,
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async_write_pending
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};
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enum lock_state
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{
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unlocked,
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lock_error,
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auto_locked,
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locked
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};
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/* Partition specific information */
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class mtinfo_part
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{
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public:
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int64_t block; /* logical block no */
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int64_t fblock; /* relative block no */
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int32_t file; /* current file no */
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bool smark; /* At setmark? */
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eom_val emark; /* "end-of"-mark */
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void initialize (int64_t nblock = -1);
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};
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class mtinfo_drive
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{
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int drive;
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int lasterr;
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int32_t partition;
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int64_t block;
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dirty_state dirty;
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lock_state lock;
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TAPE_GET_DRIVE_PARAMETERS _dp;
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TAPE_GET_MEDIA_PARAMETERS _mp;
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/* A drive is always opened exclusively by a single process, so instead
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of the OVERLAPPED structure, we just keep track of the pointer to the
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OVERLAPPED structure in the application's fhandler. */
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LPOVERLAPPED ov;
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struct status_flags
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{
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unsigned buffer_writes : 1;
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unsigned async_writes : 1;
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unsigned two_fm : 1;
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unsigned fast_eom : 1;
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unsigned auto_lock : 1;
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unsigned sysv : 1;
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unsigned nowait : 1;
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} status;
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mtinfo_part _part[MAX_PARTITION_NUM];
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inline int error (const char *str)
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{
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if (lasterr)
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debug_printf ("%s: Win32 error %d", str, lasterr);
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return lasterr;
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}
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inline bool get_feature (DWORD parm)
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{
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return ((parm & TAPE_DRIVE_HIGH_FEATURES)
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? ((_dp.FeaturesHigh & parm) != 0)
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: ((_dp.FeaturesLow & parm) != 0));
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}
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int get_pos (HANDLE mt, int32_t *ppartition = NULL, int64_t *pblock = NULL);
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int _set_pos (HANDLE mt, int mode, int64_t count, int partition, BOOL dont_wait);
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int create_partitions (HANDLE mt, int32_t count);
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int set_partition (HANDLE mt, int32_t count);
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int write_marks (HANDLE mt, int marktype, DWORD count);
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int erase (HANDLE mt, int mode);
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int prepare (HANDLE mt, int action, bool is_auto = false);
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int set_compression (HANDLE mt, int32_t count);
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int set_blocksize (HANDLE mt, DWORD count);
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int get_status (HANDLE mt, struct mtget *get);
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int set_options (HANDLE mt, int32_t options);
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int async_wait (HANDLE mt, DWORD *bytes_written);
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public:
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void initialize (int num, bool first_time);
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int get_dp (HANDLE mt);
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int get_mp (HANDLE mt);
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int open (HANDLE mt);
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int close (HANDLE mt, bool rewind);
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int read (HANDLE mt, LPOVERLAPPED pov, void *ptr, size_t &ulen);
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int write (HANDLE mt, LPOVERLAPPED pov, const void *ptr, size_t &len);
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int ioctl (HANDLE mt, unsigned int cmd, void *buf);
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int set_pos (HANDLE mt, int mode, int64_t count, bool sfm_func);
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IMPLEMENT_STATUS_FLAG (bool, buffer_writes)
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IMPLEMENT_STATUS_FLAG (bool, async_writes)
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IMPLEMENT_STATUS_FLAG (bool, two_fm)
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IMPLEMENT_STATUS_FLAG (bool, fast_eom)
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IMPLEMENT_STATUS_FLAG (bool, auto_lock)
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IMPLEMENT_STATUS_FLAG (bool, sysv)
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IMPLEMENT_STATUS_FLAG (bool, nowait)
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PTAPE_GET_DRIVE_PARAMETERS dp () { return &_dp; }
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PTAPE_GET_MEDIA_PARAMETERS mp () { return &_mp; }
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mtinfo_part *part (int num) { return &_part[num]; }
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};
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class mtinfo
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{
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mtinfo_drive _drive[MAX_DRIVE_NUM];
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public:
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void initialize ();
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mtinfo_drive *drive (int num) { return &_drive[num]; }
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};
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