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Introduction

Although there are many mature and powerful download tools at present, such as Free Download Manager, Aria2, etc. However when I want to find a library that support multiple protocols (such as http, ftp), multi-threaded download, breakpoint resume download, cross-platform, I realize that this is difficult to find a satisfactory library, especially developed by C++.

So I developed this download library named "teemo" based on libcurl, which can support the following features:

✅ Support Multi-protocol. Since teemo based on libcurl, so it supports all protocols that same as libcurl.

✅ Support multi-threaded download.

✅ Support breakpoint resume.

✅ Support for obtaining real-time download rate.

✅ Support download speed limit.

✅ Support disk cache.

Dependencies

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

• 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

unit test project depend on gtest.

vcpkg install gtest:x86-windows

Build

Firstly using CMake to generate project or makefile, then comiple.

# 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
make
make install

Getting Started

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

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

  Teemo::GlobalInit();

  Teemo efd;

  efd.setThreadNum(10);                     // Optional
  efd.setTmpFileExpiredTime(3600);          // Optional
  efd.setDiskCacheSize(20 * (2 << 19));     // Optional
  efd.setMaxDownloadSpeed(50 * (2 << 19));  // Optional

  std::shared_future<Result> async_task = efd.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
      });

  async_task.wait();

  Teemo::GlobalUnInit();

  return 0;
}

Command line tool

teemo is command line download tool based on teemo library. Usage:

teemo_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).