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Apr 30, 2015

README.md

Efficient Compression Tool

Efficient Compression Tool (or ECT) is a C++ file optimizer. It supports PNG, JPEG, GZIP and ZIP files.

Performance(v0.6)

All tests were run on OS X 10.11 using an i5-2500S and clang.

File: enwik8, 100,000,000 bytes, compressed into gzip format

Compressor File Size Time
gzip -9 36,475,811B 6.2s
zopfli -i1 35,139,225B 1m 6.4s
ECT -2 35,019,083B 16.9s
zopfli -i5 35,014,777B 1m 56.2s
ECT -3 35,012,378B 18.3s
zopfli -i15 34,987,258B 4m 3.2s
ECT -4 34,964,155B 22.5s
ECT -5 34,942,811B 28.9s
ECT -6 34,940,747B 49.7s
ECT -7 34,938,252B 1m 7.9s
ECT -8 34,937,694B 3m 54.8s

Building

From the terminal

ECT is built with cmake

mkdir build
cd build
cmake ../src
make

In 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
  • -DECT_FOLDER_SUPPORT=ON: Turn on the ability to recursively search folders (requires Boost filesystem)

With Xcode

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
make

You will run into a slight issue, which is that Xcode doesn't know how to compile some of the asm files that are a part of the mozjpeg project. 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 with $(BUILT_PRODUCTS_DIR)/x86_64/${INPUT_FILE_BASE}.o as the Output files

Assuming you're just using Xcode for development and don't need maximum speed, you can also just disable the asm files by adding -DWITH_SIMD=OFF to the cmake call.

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