Efficient Compression Tool (or ECT) is a C++ file optimizer.
It supports PNG, JPEG, GZIP and ZIP files.
All tests were run on macOS 12.5 using an Intel i7-7700HQ and clang.
File: enwik8, 100,000,000 bytes, compressed into gzip format
| Compressor | File Size | Time |
|---|---|---|
| ECT -1 | 36,493,257 | 3.5s |
| gzip -9 | 36,475,811 | 5.8s |
| zopfli -i1 | 35,102,371 | 1m 30.2s |
| ECT -2 | 35,019,440 | 14.8s |
| zopfli -i5 | 34,983,757 | 2m 12.0s |
| ECT -3 | 35,014,543 | 16.2s |
| zopfli -i15 | 34,966,078 | 3m 59.9s |
| ECT -4 | 34,963,581 | 19.8s |
| zopfli -i30 | 34,961,453 | 6m 30.6s |
| ECT -5 | 34,942,796 | 25.1s |
| ECT -6 | 34,943,943 | 41.9s |
| ECT -7 | 34,942,348 | 59.7s |
| ECT -8 | 34,941,125 | 2m 25.6s |
| ECT -9 | 34,937,781 | 3m 17.9s |
To build ECT, you need to recursively clone it, just downloading isn’t enough, i. e. git clone --recursive https://github.com/fhanau/Efficient-Compression-Tool.git
You may also need to install nasm if it is not available already.
ECT is built with cmake
mkdir build
cd build
cmake ../src
makeIn addition, you can add the following arguments to the cmake call to turn various features on and off:
-DECT_MULTITHREADING=OFF: Turn off multithreading support
You can use cmake to generate an Xcode project. Just add -G Xcode to the end of the cmake command:
mkdir build
cd build
cmake ../src -G Xcode
makeYou will run into a slight issue in that Xcode doesn't know how to compile some of the asm files within mozjpeg. To fix this, locate your copy of nasm (/usr/local/bin/nasm in the example) navigate to the Build Rules of the simd target, and add a custom rule to process source files matching *.asm with the following script:
/usr/local/bin/nasm "-I${PROJECT_DIR}/mozjpeg" -DMACHO -D__x86_64__ "-I${PROJECT_DIR}/mozjpeg/simd/nasm/" "-I${PROJECT_DIR}/mozjpeg/simd/x86_64/" -f macho64 -o "${BUILT_PRODUCTS_DIR}/x86_64/${INPUT_FILE_BASE}.o" "${INPUT_FILE_PATH}"and set $(BUILT_PRODUCTS_DIR)/x86_64/${INPUT_FILE_BASE}.o as the output files.
If you are using Xcode for development and do not need maximum speed, you can also disable the asm files by adding -DWITH_SIMD=OFF to the cmake.