CT1994 / Efficient-Compression-Tool

Fast and effective C++ file optimizer

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.