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/* CCKDEND.C (c) Copyright Roger Bowler, 1999-2001 */
/* ESA/390 Compressed CKD Endian routines */
/*-------------------------------------------------------------------*/
/* This module contains functions for compressed CKD devices related */
/* to endian conversion. */
/*-------------------------------------------------------------------*/
#include "hercules.h"
#ifndef NO_CCKD
int cckd_swapend (int, FILE *);
void cckd_swapend_chdr (CCKDDASD_DEVHDR *);
void cckd_swapend_l1 (CCKD_L1ENT *, int);
void cckd_swapend_l2 (CCKD_L2ENT *);
void cckd_swapend_free (CCKD_FREEBLK *);
void cckd_swapend4 (char *);
void cckd_swapend2 (char *);
int cckd_endian ();
#define ENDMSG(m, format, a...) \
if(m!=NULL) fprintf (m, "cckdend: " format, ## a)
/*-------------------------------------------------------------------*/
/* Change the endianess of a compressed file */
/*-------------------------------------------------------------------*/
int cckd_swapend (int fd, FILE *m)
{
int rc; /* Return code */
int i; /* Index */
CCKDDASD_DEVHDR cdevhdr; /* Compressed ckd header */
CCKD_L1ENT *l1; /* Level 1 table */
CCKD_L2ENT l2[256]; /* Level 2 table */
CCKD_FREEBLK fb; /* Free block */
int swapend; /* 1 = New endianess doesn't
match machine endianess */
U32 n; /* Level 1 table entries */
U32 o; /* Level 2 table offset */
/* fix the compressed ckd header */
rc = lseek (fd, CKDDASD_DEVHDR_SIZE, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, CKDDASD_DEVHDR_SIZE, strerror(errno));
return -1;
}
rc = read (fd, &cdevhdr, CCKDDASD_DEVHDR_SIZE);
if (rc != CCKDDASD_DEVHDR_SIZE)
{
ENDMSG (m, "cdevhdr read error fd %d: %s\n",
fd, strerror(errno));
return -1;
}
cckd_swapend_chdr (&cdevhdr);
swapend = (cckd_endian() !=
(cdevhdr.options & CCKD_BIGENDIAN) != 0);
n = cdevhdr.numl1tab;
if (swapend) cckd_swapend4((char *)&n);
rc = lseek (fd, CKDDASD_DEVHDR_SIZE, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, CKDDASD_DEVHDR_SIZE, strerror(errno));
return -1;
}
rc = write (fd, &cdevhdr, CCKDDASD_DEVHDR_SIZE);
if (rc != CCKDDASD_DEVHDR_SIZE)
{
ENDMSG (m, "cdevhdr write error fd %d: %s\n",
fd, strerror(errno));
return -1;
}
/* fix the level 1 table */
l1 = malloc (n * CCKD_L1ENT_SIZE);
if (l1 == NULL)
{
ENDMSG (m, "l1tab malloc error fd %d size %d: %s\n",
fd, n * CCKD_L1ENT_SIZE, strerror(errno));
return -1;
}
rc = lseek (fd, CCKD_L1TAB_POS, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, CCKD_L1TAB_POS, strerror(errno));
free (l1);
return -1;
}
rc = read (fd, l1, n * CCKD_L1ENT_SIZE);
if (rc != n * CCKD_L1ENT_SIZE)
{
ENDMSG (m, "l1tab read error fd %d: %s\n",
fd, strerror(errno));
free (l1);
return -1;
}
cckd_swapend_l1 (l1, n);
rc = lseek (fd, CCKD_L1TAB_POS, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, CCKD_L1TAB_POS, strerror(errno));
free (l1);
return -1;
}
rc = write (fd, l1, n * CCKD_L1ENT_SIZE);
if (rc != n * CCKD_L1ENT_SIZE)
{
ENDMSG (m, "l1tab write error fd %d: %s\n",
fd, strerror(errno));
free (l1);
return -1;
}
/* fix the level 2 tables */
for (i=0; i < n; i++)
{
o = l1[i];
if (swapend) cckd_swapend4((char *)&o);
if (o != 0 && o != 0xffffffff)
{
rc = lseek (fd, o, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, o, strerror(errno));
free (l1);
return -1;
}
rc = read (fd, &l2, CCKD_L2TAB_SIZE);
if (rc != CCKD_L2TAB_SIZE)
{
ENDMSG (m, "l2[%d] read error, offset %d byres read %d : %s\n",
i, o, rc, strerror(errno));
free (l1);
return -1;
}
cckd_swapend_l2 ((CCKD_L2ENT *)&l2);
rc = lseek (fd, o, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, o, strerror(errno));
free (l1);
return -1;
}
rc = write (fd, &l2, CCKD_L2TAB_SIZE);
if (rc != CCKD_L2TAB_SIZE)
{
ENDMSG (m, "l2[%d] write error fd %d (%d): %s\n",
i, fd, rc, strerror(errno));
free (l1);
return -1;
}
}
}
free (l1);
/* fix the free chain */
for (o = cdevhdr.free; o != 0; o = fb.pos)
{
if (swapend) cckd_swapend4 ((char *)&o);
rc = lseek (fd, o, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, o, strerror(errno));
return -1;
}
rc = read (fd, &fb, CCKD_FREEBLK_SIZE);
if (rc != CCKD_FREEBLK_SIZE)
{
ENDMSG (m, "free block read error fd %d: %s\n",
fd, strerror(errno));
return -1;
}
cckd_swapend_free (&fb);
rc = lseek (fd, o, SEEK_SET);
if (rc == -1)
{
ENDMSG (m, "lseek error fd %d offset %d: %s\n",
fd, o, strerror(errno));
return -1;
}
rc = write (fd, &fb, CCKD_FREEBLK_SIZE);
if (rc != CCKD_FREEBLK_SIZE)
{
ENDMSG (m, "free block write error fd %d: %s\n",
fd, strerror(errno));
return -1;
}
}
return 0;
}
/*-------------------------------------------------------------------*/
/* Swap endian - compressed device header */
/*-------------------------------------------------------------------*/
void cckd_swapend_chdr (CCKDDASD_DEVHDR *cdevhdr)
{
/* fix the compressed ckd header */
cdevhdr->options ^= CCKD_BIGENDIAN;
cckd_swapend4 ((char *) &cdevhdr->numl1tab);
cckd_swapend4 ((char *) &cdevhdr->numl2tab);
cckd_swapend4 ((char *) &cdevhdr->size);
cckd_swapend4 ((char *) &cdevhdr->used);
cckd_swapend4 ((char *) &cdevhdr->free);
cckd_swapend4 ((char *) &cdevhdr->free_total);
cckd_swapend4 ((char *) &cdevhdr->free_largest);
cckd_swapend4 ((char *) &cdevhdr->free_number);
cckd_swapend4 ((char *) &cdevhdr->free_imbed);
cckd_swapend2 ((char *) &cdevhdr->compress_parm);
}
/*-------------------------------------------------------------------*/
/* Swap endian - level 1 table */
/*-------------------------------------------------------------------*/
void cckd_swapend_l1 (CCKD_L1ENT *l1, int n)
{
int i; /* Index */
for (i=0; i < n; i++)
cckd_swapend4 ((char *) &l1[i]);
}
/*-------------------------------------------------------------------*/
/* Swap endian - level 2 table */
/*-------------------------------------------------------------------*/
void cckd_swapend_l2 (CCKD_L2ENT *l2)
{
int i; /* Index */
for (i=0; i < 256; i++)
{
cckd_swapend4 ((char *) &l2[i].pos);
cckd_swapend2 ((char *) &l2[i].len);
cckd_swapend2 ((char *) &l2[i].size);
}
}
/*-------------------------------------------------------------------*/
/* Swap endian - free space entry */
/*-------------------------------------------------------------------*/
void cckd_swapend_free (CCKD_FREEBLK *fb)
{
cckd_swapend4 ((char *) &fb->pos);
cckd_swapend4 ((char *) &fb->len);
}
/*-------------------------------------------------------------------*/
/* Swap endian - 4 bytes */
/*-------------------------------------------------------------------*/
void cckd_swapend4 (char *c)
{
char temp[4];
memcpy (&temp, c, 4);
c[0] = temp[3];
c[1] = temp[2];
c[2] = temp[1];
c[3] = temp[0];
}
/*-------------------------------------------------------------------*/
/* Swap endian - 2 bytes */
/*-------------------------------------------------------------------*/
void cckd_swapend2 (char *c)
{
char temp[2];
memcpy (&temp, c, 2);
c[0] = temp[1];
c[1] = temp[0];
}
/*-------------------------------------------------------------------*/
/* Are we little or big endian? From Harbison&Steele. */
/*-------------------------------------------------------------------*/
int cckd_endian()
{
union
{
long l;
char c[sizeof (long)];
} u;
u.l = 1;
return (u.c[sizeof (long) - 1] == 1);
}
#endif
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