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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Net.Http
* File: FileUpload.cs
*
* FileUpload.cs is part of VNLib.Net.Http which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Net.Http is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Net.Http is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.IO;
using System.Text;
using VNLib.Utils.IO;
using VNLib.Utils.Memory;
using VNLib.Utils.Extensions;
using static VNLib.Net.Http.Core.CoreBufferHelpers;
namespace VNLib.Net.Http
{
/// <summary>
/// Represents an file that was received as an entity body, either using Multipart/FormData or as the entity body itself
/// </summary>
public readonly struct FileUpload
{
/// <summary>
/// Content type of uploaded file
/// </summary>
public readonly ContentType ContentType;
/// <summary>
/// Name of file uploaded
/// </summary>
public readonly string FileName;
/// <summary>
/// The file data captured on upload
/// </summary>
public readonly Stream FileData;
private readonly bool OwnsHandle;
/// <summary>
/// Allocates a new binary buffer, encodes, and copies the specified data to a new <see cref="FileUpload"/>
/// structure of the specified content type
/// </summary>
/// <param name="data">The string data to copy</param>
/// <param name="dataEncoding">The encoding instance to encode the string data from</param>
/// <param name="filename">The name of the file</param>
/// <param name="ct">The content type of the file data</param>
/// <returns>The <see cref="FileUpload"/> container</returns>
internal static FileUpload FromString(ReadOnlySpan<char> data, Encoding dataEncoding, string filename, ContentType ct)
{
//get number of bytes
int bytes = dataEncoding.GetByteCount(data);
//get a buffer from the HTTP heap
MemoryHandle<byte> buffHandle = HttpPrivateHeap.Alloc<byte>(bytes);
try
{
//Convert back to binary
bytes = dataEncoding.GetBytes(data, buffHandle);
//Create a new memory stream encapsulating the file data
VnMemoryStream vms = VnMemoryStream.ConsumeHandle(buffHandle, bytes, true);
//Create new upload wrapper
return new (vms, filename, ct, true);
}
catch
{
//Make sure the hanle gets disposed if there is an error
buffHandle.Dispose();
throw;
}
}
/// <summary>
/// Initialzes a new <see cref="FileUpload"/> structure from the specified data
/// and file information.
/// </summary>
/// <param name="data"></param>
/// <param name="filename"></param>
/// <param name="ct"></param>
/// <param name="ownsHandle"></param>
public FileUpload(Stream data, string filename, ContentType ct, bool ownsHandle)
{
FileName = filename;
ContentType = ct;
//Store handle ownership
OwnsHandle = ownsHandle;
//Store the stream
FileData = data;
}
/// <summary>
/// Releases any memory the current instance holds if it owns the handles
/// </summary>
internal readonly void Free()
{
//Dispose the handle if we own it
if (OwnsHandle)
{
//This should always be synchronous
FileData.Dispose();
}
}
}
}
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