#ifndef lint
static const char rcsid[] =
- "$Id: tape.c,v 1.37 2001/04/27 15:22:47 stelian Exp $";
+ "$Id: tape.c,v 1.38 2001/05/12 11:36:12 stelian Exp $";
#endif /* not lint */
#include <config.h>
static void xtrmap __P((char *, size_t));
static void xtrmapskip __P((char *, size_t));
static void xtrskip __P((char *, size_t));
+static void setmagtapein __P((void));
#ifdef HAVE_ZLIB
-static void newcomprbuf __P((long));
+static void newcomprbuf __P((int));
static void readtape_set __P((char *));
static void readtape_uncompr __P((char *));
static void readtape_comprfile __P((char *));
#ifdef HAVE_ZLIB
static void
-newcomprbuf(long size)
+newcomprbuf(int size)
{
- if (size <= comprlen)
+ size_t buf_size = (size+1) * TP_BSIZE + sizeof(struct tapebuf);
+ if (buf_size <= comprlen)
return;
- comprlen = size + sizeof(struct tapebuf);
+ comprlen = buf_size;
if (comprbuf != NULL)
free(comprbuf);
comprbuf = malloc(comprlen);
{
int i, j, *ip;
struct STAT stbuf;
- struct mtget mt_stat;
Vprintf(stdout, "Verify tape and initialize maps\n");
#ifdef RRESTORE
if (mt < 0)
err(1, "%s", magtape);
volno = 1;
- if (!pipein) {
- /* need to know if input is really from a tape */
-#ifdef RRESTORE
- if (host)
- magtapein = rmtioctl(MTNOP, 1) != -1;
- else
-#endif
- if (ioctl(mt, MTIOCGET, (char *) &mt_stat) == 0) {
- if (mt_stat.mt_dsreg & 0xffff)
- magtapein = 1; /* fixed blocksize */
- else
- magtapein = 2; /* variable blocksize */
- }
- }
-
- Vprintf(stdout,"Input is from %s\n", magtapein? "tape": "file/pipe");
+ setmagtapein();
setdumpnum();
FLUSHTAPEBUF();
findtapeblksize();
if (zflag) {
fprintf(stderr, "Dump tape is compressed.\n");
#ifdef HAVE_ZLIB
- newcomprbuf(bufsize);
+ newcomprbuf(ntrec);
#else
errx(1,"This restore version doesn't support decompression");
#endif /* HAVE_ZLIB */
goto again;
}
gethdr:
+ setmagtapein();
volno = newvol;
setdumpnum();
FLUSHTAPEBUF();
if (!zflag)
readtape_func = readtape_uncompr;
else {
+ newcomprbuf(ntrec);
if (magtapein)
readtape_func = readtape_comprtape;
else
#endif /* HAVE_ZLIB */
/*
- * Read the first block and set the blocksize from its length. Test
- * if the block looks like a compressed dump tape. setup() will make
- * the final determination by checking the compressed flag if gethead()
+ * Read the first block and get the blocksize from it. Test
+ * for a compressed dump tape/file. setup() will make the final
+ * determination by checking the compressed flag if gethead()
* finds a valid header. The test here is necessary to offset the buffer
* by the size of the compressed prefix. zflag is set here so that
* readtape_set can set the correct function pointer for readtape().
- * Note that the first block of each tape/file will not be compressed.
+ * Note that the first block of each tape/file is not compressed
+ * and does not have a prefix.
*/
static void
findtapeblksize(void)
long i;
size_t len;
struct tapebuf *tpb = (struct tapebuf *) tapebuf;
- struct s_spcl *spclpt = (struct s_spcl *) tpb->buf;
+ struct s_spcl *spclpt = (struct s_spcl *) tapebuf;
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
* For a pipe or file, read in the first record. For a tape, read
* the first block.
*/
- if (magtapein == 1) /* fixed blocksize tape, not compressed */
- len = ntrec * TP_BSIZE;
- else if (magtapein == 2)/* variable blocksize tape */
- len = bufsize + PREFIXSIZE;
- else /* not mag tape */
- len = TP_BSIZE;
+ len = magtapein ? ntrec * TP_BSIZE : TP_BSIZE;
if (read_a_block(mt, tapebuf, len, &i) <= 0)
errx(1, "Tape read error on first record");
/*
* If the input is from a file or a pipe, we read TP_BSIZE
- * bytes looking for a compressed dump header, we then
- * need to read in the rest of the record, as determined by
- * tpb->length or bufsize. The first block of the dump is
- * guaranteed to not be compressed so we look at the header.
+ * bytes looking for a dump header. If the dump is compressed
+ * we need to read in the rest of the block, as determined
+ * by c_ntrec in the dump header. The first block of the
+ * dump is not compressed and does not have a prefix.
*/
if (!magtapein) {
- if (tpb->length % TP_BSIZE == 0
- && tpb->length <= bufsize
- && tpb->compressed == 0
- && spclpt->c_type == TS_TAPE
+ if (spclpt->c_type == TS_TAPE
&& spclpt->c_flags & DR_COMPRESSED) {
- /* Looks like it's a compressed dump block prefix, */
- /* read in the rest of the block based on tpb->length. */
- len = tpb->length - TP_BSIZE + PREFIXSIZE;
- if (read_a_block(mt, tapebuf+TP_BSIZE, len, &i) <= 0
- || i != len)
- errx(1,"Error reading dump file header");
- tbufptr = tpb->buf;
- numtrec = ntrec = tpb->length / TP_BSIZE;
+ /* It's a compressed dump file, read in the */
+ /* rest of the block based on spclpt->c_ntrec. */
+ if (spclpt->c_ntrec > ntrec)
+ errx(1, "Tape blocksize is too large, use "
+ "\'-b %d\' ", spclpt->c_ntrec);
+ ntrec = spclpt->c_ntrec;
+ len = (ntrec - 1) * TP_BSIZE;
zflag = 1;
}
else {
/* read in the rest of the block based on bufsize */
len = bufsize - TP_BSIZE;
- if (read_a_block(mt, tapebuf+TP_BSIZE, len, &i) < 0
- || (i != len && i % TP_BSIZE != 0))
- errx(1,"Error reading dump file header");
- tbufptr = tapebuf;
- numtrec = ntrec;
}
+ if (read_a_block(mt, tapebuf+TP_BSIZE, len, &i) < 0
+ || (i != len && i % TP_BSIZE != 0))
+ errx(1,"Error reading dump file header");
+ tbufptr = tapebuf;
+ numtrec = ntrec;
Vprintf(stdout, "Input block size is %ld\n", ntrec);
return;
- }
+ } /* if (!magtapein) */
/*
- * If the input is a variable block size tape, we tried to
- * read PREFIXSIZE + ntrec * TP_BSIZE bytes.
- * If it's not a compressed dump tape or the value of ntrec is
- * too large, we have read less than * what we asked for;
- * adjust the value of ntrec and test for * a compressed dump
- * tape prefix.
+ * If the input is a tape, we tried to read ntrec * TP_BSIZE bytes.
+ * If the value of ntrec is too large, we read less than
+ * what we asked for; adjust the value of ntrec and test for
+ * a compressed dump tape.
*/
if (i % TP_BSIZE != 0) {
+ /* may be old format compressed dump tape with a prefix */
+ spclpt = (struct s_spcl *) tpb->buf;
if (i % TP_BSIZE == PREFIXSIZE
&& tpb->compressed == 0
&& spclpt->c_type == TS_TAPE
&& spclpt->c_flags & DR_COMPRESSED) {
-
zflag = 1;
tbufptr = tpb->buf;
if (tpb->length > bufsize)
i, TP_BSIZE);
}
ntrec = i / TP_BSIZE;
+ if (spclpt->c_type == TS_TAPE) {
+ if (spclpt->c_flags & DR_COMPRESSED)
+ zflag = 1;
+ if (spclpt->c_ntrec > ntrec)
+ errx(1, "Tape blocksize is too large, use "
+ "\'-b %d\' ", spclpt->c_ntrec);
+ }
numtrec = ntrec;
Vprintf(stdout, "Tape block size is %ld\n", ntrec);
}
(void) close(mt);
}
+static void
+setmagtapein(void) {
+ struct mtget mt_stat;
+ static int done = 0;
+ if (done)
+ return;
+ done = 1;
+ if (!pipein) {
+ /* need to know if input is really from a tape */
+#ifdef RRESTORE
+ if (host)
+ magtapein = rmtioctl(MTNOP, 1) != -1;
+ else
+#endif
+ magtapein = ioctl(mt, MTIOCGET, (char *)&mt_stat) == 0;
+ }
+
+ Vprintf(stdout,"Input is from %s\n", magtapein? "tape": "file/pipe");
+}
+
/*
* Read the next block from the tape.
* Check to see if it is one of several vintage headers.
git.wh0rd.org / dump.git / blobdiff