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Fix handling of "final" flag in zstd decompression

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We were returning "DONE" on truncated input streams, which was not
what we wanted.
This commit is contained in:
Nick Mathewson 2017-04-27 10:42:05 -04:00
parent 166aa8d741
commit 39cfaba9e2
1 changed files with 10 additions and 2 deletions
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12
src/common/compress_zstd.c
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@ -316,7 +316,10 @@ tor_zstd_compress_process(tor_zstd_compress_state_t *state,
return TOR_COMPRESS_BUFFER_FULL;
}
if (state->compress && finish) {
if (!finish) {
// We're not done with the input, so no need to flush.
return TOR_COMPRESS_OK;
} else if (state->compress && finish) {
retval = ZSTD_endStream(state->u.compress_stream, &output);
*out = (char *)output.dst + output.pos;
@ -333,9 +336,14 @@ tor_zstd_compress_process(tor_zstd_compress_state_t *state,
// epilogue.
if (retval > 0)
return TOR_COMPRESS_BUFFER_FULL;
return TOR_COMPRESS_DONE;
} else {
// ZSTD_flushStream returns 0 if the frame is done, or >0 if it
// is incomplete.
return (retval == 0) ? TOR_COMPRESS_DONE : TOR_COMPRESS_OK;
}
return finish ? TOR_COMPRESS_DONE : TOR_COMPRESS_OK;
#else // HAVE_ZSTD.
(void)state;
(void)out;