denuvo-ref/precomp-cpp
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Tolerance for identical compressed bytes

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This commit is contained in:
Christian Schneider 2017-08-30 08:17:31 +02:00
parent 3709606149
commit f3244b5f9c
1 changed files with 17 additions and 2 deletions
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19
precomp.cpp
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@ -100,6 +100,7 @@ using namespace std;
#define COMP_CHUNK 512
#define IN_BUF_SIZE 65536 //input buffer
#define PENALTY_BYTES_TOLERANCE 160
#define IDENTICAL_COMPRESSED_BYTES_TOLERANCE 32
#define MAX_IO_BUFFER_SIZE 64 * 1024 * 1024
unsigned char* decomp_io_buf = NULL;
@ -6080,7 +6081,14 @@ void try_recompress(FILE* origfile, int comp_level, int mem_level, int windowbit
printf ("Identical decompressed bytes: %i of %i\n", identical_bytes_decomp, decomp_bytes_total);
}
final_compression_found = (identical_bytes_decomp == decomp_bytes_total) && (identical_bytes == compressed_stream_size) && (penalty_bytes_len < PENALTY_BYTES_TOLERANCE);
bool enough_identical_compressed_bytes = (identical_bytes == compressed_stream_size);
if (!enough_identical_compressed_bytes) {
if ((identical_bytes > DEF_COMPARE_CHUNK) && (identical_bytes + IDENTICAL_COMPRESSED_BYTES_TOLERANCE >= compressed_stream_size)) {
enough_identical_compressed_bytes = true;
}
}
final_compression_found = (identical_bytes_decomp == decomp_bytes_total) && (enough_identical_compressed_bytes) && (penalty_bytes_len < PENALTY_BYTES_TOLERANCE);
// Partial matches sometimes need all the decompressed bytes, but there are much less
// identical recompressed bytes - in these cases, all the decompressed bytes have to
@ -6126,7 +6134,14 @@ void try_recompress_bzip2(FILE* origfile, int level, int& compressed_stream_size
printf ("Identical decompressed bytes: %i of %i\n", identical_bytes_decomp, decomp_bytes_total);
}
final_compression_found = (identical_bytes_decomp == decomp_bytes_total) && (identical_bytes == compressed_stream_size) && (penalty_bytes_len < PENALTY_BYTES_TOLERANCE);
bool enough_identical_compressed_bytes = (identical_bytes == compressed_stream_size);
if (!enough_identical_compressed_bytes) {
if ((identical_bytes > DEF_COMPARE_CHUNK) && (identical_bytes + IDENTICAL_COMPRESSED_BYTES_TOLERANCE >= compressed_stream_size)) {
enough_identical_compressed_bytes = true;
}
}
final_compression_found = (identical_bytes_decomp == decomp_bytes_total) && (enough_identical_compressed_bytes) && (penalty_bytes_len < PENALTY_BYTES_TOLERANCE);
}
best_identical_bytes_decomp = identical_bytes_decomp;