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GhostScriptWrapper.cs
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GhostScriptWrapper.cs
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using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Windows;
namespace QuickLook.Plugin.PostScriptViewer
{
internal static class GhostScriptWrapper
{
private static readonly string GhostScriptPath =
Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "gs9.52\\gswin32c.exe");
public static MemoryStream ConvertToPdf(string file)
{
var arg = $@"-sDEVICE=pdfwrite -dEPSCrop -q -o- ""{file}""";
var stdout = Execute(arg);
return stdout;
}
public static List<Size> GetPageSizes(string file)
{
var result = new List<Size>();
var arg =
$@"-q -dNODISPLAY -dBATCH -dNOPAUSE -c ""/showpage{{currentpagedevice /PageSize get{{=}}forall showpage}}bind def"" -f ""{file}""";
var stdout = Encoding.ASCII.GetString(Execute(arg)?.ToArray() ?? new byte[0]);
if (string.IsNullOrEmpty(stdout))
return new List<Size>();
var lines = stdout.Replace("\r\n", "\n").Split('\n');
for (var i = 0; i < lines.Length - 1; i += 2)
{
if (string.IsNullOrWhiteSpace(lines[i]) &&
string.IsNullOrWhiteSpace(lines[i + 1]))
continue;
if (!double.TryParse(lines[i], out var width) || !double.TryParse(lines[i + 1], out var height))
continue;
result.Add(new Size(width, height));
}
return result;
}
private static MemoryStream Execute(string arguments)
{
var proc = new Process
{
StartInfo =
{
FileName = GhostScriptPath,
Arguments = arguments,
RedirectStandardOutput = true,
RedirectStandardError = true,
CreateNoWindow = true,
UseShellExecute = false
}
};
proc.Start();
var ms = new MemoryStream();
proc.StandardOutput.BaseStream.CopyTo(ms);
return proc.ExitCode != 0 ? null : ms;
}
}
}