+ {
+ tcom.mt_op = MTFSR;
+ tcom.mt_count = 1;
+ rl = ioctl(mt, MTIOCTOP, &tcom);
+ }
+
+ if (rl < 0) {
+ warn("continuation failed");
+ if (!yflag && !reply("assume end-of-tape and continue"))
+ exit(1);
+ ret = 0; /* end of tape */
+ goto readerr;
+ }
+
+moverecord:
+ blkcnt = 0;
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ blksread++;
+ tpblksread++;
+}
+
+/*
+ * Decompress a struct tapebuf into a buffer. readsize is the size read
+ * from the tape/file and is used for error messages. Returns a pointer
+ * to the location of the uncompressed buffer or NULL on errors.
+ * Adjust numtrec and complain for a short block.
+ */
+static char *
+decompress_tapebuf(struct tapebuf *tpbin, int readsize)
+{
+ /* If zflag is on, all blocks have a struct tapebuf prefix */
+ /* zflag gets set in setup() from the dump header */
+ int cresult, blocklen;
+ unsigned long worklen;
+ char *output = NULL,*reason = NULL, *lengtherr = NULL;
+
+ /* build a length error message */
+ blocklen = tpbin->length;
+ if (readsize < blocklen + PREFIXSIZE)
+ lengtherr = "short";
+ else
+ if (readsize > blocklen + PREFIXSIZE)
+ lengtherr = "long";
+
+ worklen = comprlen;
+ cresult = Z_OK;
+ if (tpbin->compressed) {
+ /* uncompress whatever we read, if it fails, complain later */
+ cresult = uncompress(comprbuf, &worklen, tpbin->buf, blocklen);
+ output = comprbuf;
+ }
+ else {
+ output = tpbin->buf;
+ worklen = blocklen;
+ }
+ switch (cresult) {
+ case Z_OK:
+ if (worklen != ntrec * TP_BSIZE) {
+ /* short block, shouldn't happen, but... */
+ reason = "length mismatch";
+ if (worklen % TP_BSIZE == 0)
+ numtrec = worklen / TP_BSIZE;
+ }
+ break;
+ case Z_MEM_ERROR:
+ reason = "not enough memory";
+ break;
+ case Z_BUF_ERROR:
+ reason = "buffer too small";
+ break;
+ case Z_DATA_ERROR:
+ reason = "data error";
+ break;
+ default:
+ reason = "unknown";
+ } /*switch */
+ if (reason) {
+ if (lengtherr)
+ fprintf(stderr, "%s compressed block: %d expected: %d\n",
+ lengtherr, readsize, tpbin->length + PREFIXSIZE);
+ fprintf(stderr, "decompression error, block %ld: %s\n",
+ tpblksread+1, reason);
+ if (cresult != Z_OK) output = NULL;
+ }
+ return output;
+}
+
+/*
+ * Print an error message for a read error.
+ * This was exteracted from the original readtape().
+ */
+static void
+msg_read_error(char *m)
+{
+ switch (curfile.action) {
+ default:
+ fprintf(stderr, "%s trying to set up tape\n", m);
+ break;
+ case UNKNOWN:
+ fprintf(stderr, "%s trying to resynchronize\n", m);
+ break;
+ case USING:
+ fprintf(stderr, "%s restoring %s\n", m, curfile.name);
+ break;
+ case SKIP:
+ fprintf(stderr, "%s skipping over inode %lu\n", m,
+ (unsigned long)curfile.ino);
+ break;
+ }
+}
+#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()
+ * 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.
+ */
+static void
+findtapeblksize(void)
+{
+ long i;
+ size_t len;
+ struct tapebuf *tpb = (struct tapebuf *) tapebuf;
+ struct s_spcl *spclpt = (struct s_spcl *) tpb->buf;
git.wh0rd.org / dump.git / commitdiff
