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Skip empty match blocks if they're found at the end as they may be created with incompressible data.

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Con Kolivas 2019-12-03 12:22:11 +11:00
parent 93d579a1b8
commit 86661e68bf
1 changed files with 10 additions and 2 deletions
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12
stream.c
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@ -1635,13 +1635,21 @@ fill_another:
c_len = le64toh(c_len);
u_len = le64toh(u_len);
last_head = le64toh(last_head);
print_maxverbose("Fill_buffer stream %d c_len %lld u_len %lld last_head %lld\n", streamno, c_len, u_len, last_head);
/* It is possible for there to be an empty match block at the end of
* incompressible data */
if (unlikely(c_len == 0 && u_len == 0 && streamno == 1 && last_head == 0)) {
print_maxverbose("Skipping empty match block\n");
goto skip_empty;
}
/* Check for invalid data and that the last_head is actually moving
* forward correctly. */
if (unlikely(c_len < 1 || u_len < 1 || last_head < 0 || (last_head && last_head <= s->last_head))) {
fatal_return(("Invalid data compressed len %lld uncompressed %lld last_head %lld\n",
c_len, u_len, last_head), -1);
}
print_maxverbose("Fill_buffer stream %d c_len %lld u_len %lld last_head %lld\n", streamno, c_len, u_len, last_head);
padded_len = MAX(c_len, MIN_SIZE);
sinfo->total_read += padded_len;
@ -1690,7 +1698,7 @@ fill_another:
if (++s->uthread_no == s->base_thread + s->total_threads)
s->uthread_no = s->base_thread;
skip_empty:
/* Reached the end of this stream, no more data to read in, otherwise
* see if the next thread is free to grab more data. We also check that
* we're not going to be allocating too much ram to generate all these