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Add unit tests for the NO_METHOD compressor
These required some special-casing, since some of the assumption about real compression algorithms don't actually hold for the identity transform. Specifically, we had assumed: - compression functions typically change the lengths of their inputs. - decompression functions can detect truncated inputs - compression functions have detectable headers None of those is true for the identity transformation.
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@ -611,7 +611,11 @@ test_buffers_compress_fin_at_chunk_end_impl(compress_method_t method,
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tt_int_op(fetch_from_buf(contents, in_len, buf), OP_EQ, 0);
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tt_uint_op(in_len, OP_GT, headerjunk);
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if (method == NO_METHOD) {
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tt_uint_op(in_len, OP_EQ, headerjunk);
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} else {
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tt_uint_op(in_len, OP_GT, headerjunk);
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}
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tt_int_op(0, OP_EQ, tor_uncompress(&expanded, &out_len,
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contents + headerjunk,
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@ -855,6 +859,8 @@ struct testcase_t buffer_tests[] = {
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&passthrough_setup, (char*)"x-zstd" },
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{ "compress/lzma", test_buffers_compress, TT_FORK,
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&passthrough_setup, (char*)"x-lzma" },
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{ "compress/none", test_buffers_compress, TT_FORK,
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&passthrough_setup, (char*)"identity" },
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END_OF_TESTCASES
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};
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@ -2255,8 +2255,15 @@ test_util_compress_impl(compress_method_t method)
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tt_assert(!tor_compress(&buf2, &len1, buf1, strlen(buf1)+1, method));
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tt_assert(buf2 != NULL);
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tt_int_op(len1, OP_LT, strlen(buf1));
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tt_int_op(detect_compression_method(buf2, len1), OP_EQ, method);
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if (method == NO_METHOD) {
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// The identity transform doesn't actually compress, and it isn't
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// detectable as "the identity transform."
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tt_int_op(len1, OP_EQ, strlen(buf1)+1);
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tt_int_op(detect_compression_method(buf2, len1), OP_EQ, UNKNOWN_METHOD);
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} else {
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tt_int_op(len1, OP_LT, strlen(buf1));
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tt_int_op(detect_compression_method(buf2, len1), OP_EQ, method);
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}
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tt_assert(!tor_uncompress(&buf3, &len2, buf2, len1, method, 1, LOG_INFO));
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tt_assert(buf3 != NULL);
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@ -2300,11 +2307,14 @@ test_util_compress_impl(compress_method_t method)
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tt_assert(fast_memeq(buf1, buf3, len2));
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tt_int_op(buf3[len2], OP_EQ, 0);
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/* when we demand a complete output, this must fail. */
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/* when we demand a complete output from a real compression method, this
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* must fail. */
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tor_free(buf3);
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tt_assert(tor_uncompress(&buf3, &len2, buf2, len1-16,
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method, 1, LOG_INFO));
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tt_assert(buf3 == NULL);
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if (method != NO_METHOD) {
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tt_assert(tor_uncompress(&buf3, &len2, buf2, len1-16,
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method, 1, LOG_INFO));
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tt_assert(buf3 == NULL);
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}
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done:
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tor_free(buf1);
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@ -2337,7 +2347,11 @@ test_util_compress_stream_impl(compress_method_t method,
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tt_int_op(tor_compress_process(state, &cp1, &len1, &ccp2, &len2, 1),
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OP_EQ, TOR_COMPRESS_DONE);
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tt_int_op(0, OP_EQ, len2);
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tt_assert(cp1 > cp2); /* Make sure we really added something. */
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if (method == NO_METHOD) {
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tt_ptr_op(cp1, OP_EQ, cp2);
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} else {
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tt_assert(cp1 > cp2); /* Make sure we really added something. */
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}
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tt_assert(!tor_uncompress(&buf3, &len2, buf1, 1024-len1,
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method, 1, LOG_WARN));
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@ -5755,6 +5769,7 @@ struct testcase_t util_tests[] = {
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COMPRESS(gzip, "gzip"),
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COMPRESS(lzma, "x-lzma"),
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COMPRESS(zstd, "x-zstd"),
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COMPRESS(none, "identity"),
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UTIL_TEST(gzip_compression_bomb, TT_FORK),
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UTIL_LEGACY(datadir),
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UTIL_LEGACY(memarea),
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