Use aria2 to do downloads (other than aria2 itself, 7za and 7zr)

scripts/VcpkgPowershellUtils.ps1

@@ -155,6 +155,32 @@ function vcpkgDownloadFile( [Parameter(Mandatory=$true)][string]$url,
     Move-Item -Path $downloadPartPath -Destination $downloadPath
 }
 
+function vcpkgDownloadFileWithAria2(    [Parameter(Mandatory=$true)][string]$aria2exe,
+                                        [Parameter(Mandatory=$true)][string]$url,
+                                        [Parameter(Mandatory=$true)][string]$downloadPath)
+{
+    if (Test-Path $downloadPath)
+    {
+        return
+    }
+
+    vcpkgCreateParentDirectoryIfNotExists $downloadPath
+    $downloadPartPath = "$downloadPath.part"
+    vcpkgRemoveItem $downloadPartPath
+
+    $parentDir = split-path -parent $downloadPath
+    $filename = split-path -leaf $downloadPath
+
+    $ec = vcpkgInvokeCommand "$aria2exe" "--dir `"$parentDir`" --out `"$filename.part`" $url"
+    if ($ec -ne 0)
+    {
+        Write-Host "Could not download $url"
+        throw
+    }
+
+    Move-Item -Path $downloadPartPath -Destination $downloadPath
+}
+
 function vcpkgExtractFile(  [Parameter(Mandatory=$true)][string]$sevenZipExe,
                             [Parameter(Mandatory=$true)][string]$archivePath,
                             [Parameter(Mandatory=$true)][string]$destinationDir)

scripts/fetchTool.ps1

@@ -47,7 +47,18 @@ function fetchToolInternal([Parameter(Mandatory=$true)][string]$tool)
     if (!(Test-Path $downloadPath))
     {
         Write-Host "Downloading $tool..."
+
+        # aria2 needs 7zip & 7zr to extract. So, we need to download those trough powershell
+        if ($tool -eq "aria2" -or $tool -eq "7zip" -or $tool -eq "7zr")
+        {
             vcpkgDownloadFile $url $downloadPath
+        }
+        else
+        {
+            $aria2exe = fetchToolInternal "aria2"
+            vcpkgDownloadFileWithAria2 $aria2exe $url $downloadPath
+        }
+
         Write-Host "Downloading $tool... done."
     }
 

scripts/vcpkgTools.xml

@@ -60,6 +60,13 @@
         <url>https://www.7-zip.org/a/7zr.exe</url>
         <sha256>2c7a8709260e0295a2a3cfd5a8ad0459f37490ed1794ea68bf85a6fab362553b</sha256>
     </tool>
+    <tool name="aria2">
+        <requiredVersion>18.01.0</requiredVersion>
+        <exeRelativePath>aria2-1.33.1-win-32bit-build1\aria2c.exe</exeRelativePath>
+        <url>https://github.com/aria2/aria2/releases/download/release-1.33.1/aria2-1.33.1-win-32bit-build1.zip</url>
+        <sha256>04bf07c0449c703db17fbcd586365aebba00201ca513ca4808b543f1f9208f1f</sha256>
+        <archiveRelativePath>aria2-1.33.1-win-32bit-build1.zip</archiveRelativePath>
+    </tool>
     <tool name="ninja" os="linux">
         <requiredVersion>1.8.2</requiredVersion>
         <exeRelativePath>ninja</exeRelativePath>