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Handle case where inflateSync used when header never processed.

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If zlib and/or gzip header processing was requested, but a header
was never provided and inflateSync was used successfully, then the
inflate state would be inconsistent, trying to compute a check
value but with no flags set. This commit sets the inflate mode to
raw in this case, since there is no other assumption that can be
made if a header was requested but never seen.
This commit is contained in:
Mark Adler 2017-04-16 08:35:33 -07:00
parent 89245c0a84
commit 44e8ac810d
1 changed files with 2 additions and 0 deletions
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2
inflate.c
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@ -1433,6 +1433,8 @@ z_streamp strm;
/* return no joy or set up to restart inflate() on a new block */
if (state->have != 4) return Z_DATA_ERROR;
if (state->mode == HEAD)
state->wrap = 0; /* never processed header, so assume raw */
in = strm->total_in; out = strm->total_out;
inflateReset(strm);
strm->total_in = in; strm->total_out = out;