ckolivas/lrzip
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We do need to seek to read the MD5 correctly on very small files so support seeking to end and then seek to the md5 start.

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This commit is contained in:
ckolivas 2011-03-17 11:53:29 +11:00
parent 660243b8dc
commit ae63349e3c
1 changed files with 35 additions and 6 deletions
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41
runzip.c
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@ -108,13 +108,40 @@ static i64 seekto_fdhist(rzip_control *control, i64 pos)
return pos;
}
static i64 seekcur_fdin(struct rzip_control *control)
static i64 seekcur_fdin(rzip_control *control)
{
if (!TMP_INBUF)
return lseek(control->fd_in, 0, SEEK_CUR);
return control->in_ofs;
}
static i64 seekto_fdin(rzip_control *control, i64 pos)
{
if (!TMP_INBUF)
return lseek(control->fd_in, pos, SEEK_SET);
if (unlikely(pos > control->in_len || pos < 0)) {
print_err("Trying to seek outside tmpinbuf to %lld in seekto_fdin\n", pos);
return -1;
}
control->in_ofs = pos;
return 0;
}
static i64 seekto_fdinend(rzip_control *control)
{
int tmpchar;
if (!TMP_INBUF)
return lseek(control->fd_in, 0, SEEK_END);
while ((tmpchar = getchar()) != EOF) {
control->tmp_inbuf[control->in_len++] = (char)tmpchar;
if (unlikely(control->in_len > control->in_maxlen))
failure("Trying to read greater than max_len\n");
}
control->in_ofs = control->in_len;
return control->in_ofs;
}
static i64 read_header(rzip_control *control, void *ss, uchar *head)
{
int chunk_bytes = 2;
@ -340,11 +367,13 @@ i64 runzip_fd(rzip_control *control, int fd_in, int fd_out, int fd_hist, i64 exp
md5_finish_ctx (&control->ctx, md5_resblock);
if (HAS_MD5) {
#if 0
/* Unnecessary, we should already be there */
if (unlikely(lseek(fd_in, -MD5_DIGEST_SIZE, SEEK_END)) == -1)
fatal("Failed to seek to md5 data in runzip_fd\n");
#endif
i64 fdinend = seekto_fdinend(control);
if (unlikely(fdinend == -1))
failure("Failed to seekto_fdinend in rzip_fd\n");
if (unlikely(seekto_fdin(control, fdinend - MD5_DIGEST_SIZE) == -1))
failure("Failed to seekto_fdin in rzip_fd\n");
if (unlikely(read_1g(control, fd_in, md5_stored, MD5_DIGEST_SIZE) != MD5_DIGEST_SIZE))
fatal("Failed to read md5 data in runzip_fd\n");
if (ENCRYPT) {