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A C++ file download library.

• Multi-protocol, such as HTTP(s), FTP(s)...

• Segmented downloads and breakpoint transmission.

• Limit download speed.

• Configure disk cache.

• Support downloading large files (TB level).

• Compatible with server leeching detection(or limit).

The zoe library has been included in Microsoft's vcpkg, you can use the following command to install zoe:

1. Clone and setup vcpkg (See more detail on https://github.com/microsoft/vcpkg)

   git clone https://github.com/Microsoft/vcpkg.git
   cd vcpkg
   PS> bootstrap-vcpkg.bootstrap
   Linux:~/$ ./bootstrap-vcpkg.sh

2. Install zoe

   PS> .\vcpkg install zoe [--triplet x64-windows-static/x64-windows/x64-windows-static-md and etc...]
   Linux:~/$ ./vcpkg install zoe

Step 1: Install dependencies

I prefer to use vcpkg to install dependencies. Of course, this is not the only way, you can install dependencies through any ways.

Recommend: add the directory where vcpkg.exe resides to the PATH environment variable.

• libcurl

  # if you want support non-http protocol, such as ftp, the [non-http] option must be specified.
  vcpkg install curl[non-http]:x86-windows

• gtest

  vcpkg install gtest:x86-windows

Step 2: Compile

Firstly using CMake to generate project or makefile, then comiple it:

Windows Sample:

cmake.exe -G "Visual Studio 15 2017" -DBUILD_SHARED_LIBS=ON -DBUILD_TESTS=ON -S %~dp0 -B %~dp0build

Linux Sample:

cmake -DBUILD_SHARED_LIBS=ON -DBUILD_TESTS=ON

# If using vcpkg to install dependencies, you have to special CMAKE_TOOLCHAIN_FILE
cmake -DCMAKE_TOOLCHAIN_FILE=/xxx/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-linux -DBUILD_SHARED_LIBS=ON -DBUILD_TESTS=ON

make

#include <iostream>
#include "zoe.h"

int main(int argc, char** argv) {
  using namespace zoe;

  Zoe::GlobalInit();

  Zoe z;

  z.setThreadNum(10);                     // Optional
  z.setTmpFileExpiredTime(3600);          // Optional
  z.setDiskCacheSize(20 * (2 << 19));     // Optional
  z.setMaxDownloadSpeed(50 * (2 << 19));  // Optional
  z.setHashVerifyPolicy(ALWAYS, MD5, "6fe294c3ef4765468af4950d44c65525"); // Optional, support MD5, CRC32, SHA256
  // There are more options available, please check zoe.h
  z.setVerboseOutput([](const utf8string& verbose) { // Optional
    printf("%s\n", verbose.c_str());
  });
  z.setHttpHeaders({  // Optional
    {u8"Origin", u8"http://xxx.xxx.com"},
    {u8"User-Agent", u8"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)"}
   });
  
  std::shared_future<Result> res = z.start(
      u8"http://xxx.xxx.com/test.exe", u8"D:\\test.exe",
      [](Result result) {  // Optional
        // result callback
      },
      [](int64_t total, int64_t downloaded) {  // Optional
        // progress callback
      },
      [](int64_t byte_per_secs) {  // Optional
        // real-time speed callback
      });

  res.wait();

  Zoe::GlobalUnInit();

  return 0;
}

zoe_tool is command-line tool based on zoe library.

Usage:

zoe_tool URL TargetFilePath [ThreadNum] [DiskCacheMb] [MD5] [TmpExpiredSeconds] [MaxSpeed]

• URL: Download URL.
• TargetFilePath: target file saved path.
• ThreadNum: thread number, optional, default is 1.
• DiskCacheMb: Disk cache size(Mb), default is 20Mb.
• MD5: target file md5, optional, if this value isn't empty, tools will check file md5 after download finished.
• TmpExpiredSeconds: seconds, optional, the temporary file will expired after these senconds.
• MaxSpeed: max download speed(byte/s).