/* Read a tape block of size 16K */
afs_int32
readblock(char *buffer)
{
u_int nread, total = 0;
int rc, fmcount = 0;
while (total < BUTM_BLOCKSIZE) {
rc = USD_READ(fd, buffer + total, BUTM_BLOCKSIZE - total, &nread);
if (rc != 0) {
return (rc);
} else if ((nread == 0) && (total == 0)) {
if (verbose)
fprintf(stderr, "Hardware file mark\n");
if (++fmcount > 3) {
if (verbose)
fprintf(stderr,
"Greater than 3 hardware file marks in a row - done\n");
return -1;
}
} else if (nread == 0) {
fprintf(stderr, "Reached unexpected end of dump file\n");
return -1;
} else {
total += nread;
}
}
return 0;
}
afs_int32
readData(usd_handle_t fid, char *data, afs_uint32 totalSize, afs_int32 *errorP)
{
afs_int32 toread; /* Number of bytes to read */
afs_uint32 rSize; /* Total bytes read so far */
afs_uint32 tSize; /* Temporary size */
afs_int32 rc; /* return code */
toread = totalSize; /* First, try to read all the data */
rc = USD_READ(fid, &data[0], toread, &rSize);
if (rc != 0) {
*errorP = rc;
return -1;
}
if (rSize == 0) /* reached EOF */
return rSize;
if (rSize != TapeBlockSize) { /* Tape block size has changed */
TapeBlockSize = rSize;
printf("Tape blocks read in %d Byte chunks.\n", TapeBlockSize);
}
/* Read the rest of the data in */
while (rSize < totalSize) {
toread =
((totalSize - rSize) <
TapeBlockSize ? (totalSize - rSize) : TapeBlockSize);
rc = USD_READ(fid, &data[rSize], toread, &tSize);
if (rc)
*errorP = rc;
else
rSize += tSize;
if (tSize != toread)
break;
}
if (rSize > totalSize)
printf("readData - Read > 16K data block - continuing.\n");
return (rSize);
}