Question

我在https://mnaoumov.wordpress.com/2013/08/20/efficient-base64-conversion-in-powershell/

上找到了此代码

它适用于Windows 8.1 Powershell 4，但在Powershell 2上，当我将base64字符串解码回文件时，它似乎在文件的末尾添加了一个字节。 Powershell 2还会抛出有关base64字符串无效长度的错误，但它仍然会创建该文件。

我一直试图解决这个问题几个小时，但我不知道.net足以弄明白这个问题。

我使用这些函数来携带数据是一个更大的脚本。它在Powershell 4上没有任何错误。

我需要在超过3000台Windows 7机器上运行，坚持使用Powershell 4不是解决方案。

function ConvertTo-Base64
{
    param
    (
        [string] $SourceFilePath,
        [string] $TargetFilePath
    )

    $SourceFilePath = Resolve-PathSafe $SourceFilePath
    $TargetFilePath = Resolve-PathSafe $TargetFilePath

    $bufferSize = 9000 # should be a multiplier of 3
    $buffer = New-Object byte[] $bufferSize

    $reader = [System.IO.File]::OpenRead($SourceFilePath)
    $writer = [System.IO.File]::CreateText($TargetFilePath)

    $bytesRead = 0
    do
    {
        $bytesRead = $reader.Read($buffer, 0, $bufferSize);
        $writer.Write([Convert]::ToBase64String($buffer, 0, $bytesRead));
    } while ($bytesRead -eq $bufferSize);

    $reader.Dispose()
    $writer.Dispose()
}

function ConvertFrom-Base64
{
    param
    (
        [string] $SourceFilePath,
        [string] $TargetFilePath
    )

    $SourceFilePath = Resolve-PathSafe $SourceFilePath
    $TargetFilePath = Resolve-PathSafe $TargetFilePath

    $bufferSize = 9000 # should be a multiplier of 4
    $buffer = New-Object char[] $bufferSize

    $reader = [System.IO.File]::OpenText($SourceFilePath)
    $writer = [System.IO.File]::OpenWrite($TargetFilePath)

    $bytesRead = 0
    do
    {
        $bytesRead = $reader.Read($buffer, 0, $bufferSize);
        $bytes = [Convert]::FromBase64CharArray($buffer, 0, $bytesRead);
        $writer.Write($bytes, 0, $bytes.Length);
    } while ($bytesRead -eq $bufferSize);

    $reader.Dispose()
    $writer.Dispose()
}

function Resolve-PathSafe
{
    param
    (
        [string] $Path
    )

    $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Path)
}

ConvertTo-Base64 .\file .\Converted-File.txt

Powershell 2.0破坏了Base64文件转换

0 个答案: