cyf
89 lines
2.4 KiB
C#
89 lines
2.4 KiB
C#
namespace Cef3
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{
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Runtime.InteropServices;
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using Cef3.Interop;
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/// <summary>
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/// Interface the client can implement to provide a custom stream reader. The
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/// methods of this class may be called on any thread.
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/// </summary>
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public abstract unsafe partial class CefReadHandler
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{
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private UIntPtr read(cef_read_handler_t* self, void* ptr, UIntPtr size, UIntPtr n)
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{
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CheckSelf(self);
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var length = (long)size * (long)n;
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using (var stream = new UnmanagedMemoryStream((byte*)ptr, length, length, FileAccess.Write))
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{
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return (UIntPtr)Read(stream, length);
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}
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}
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/// <summary>
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/// Read raw binary data.
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/// </summary>
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protected abstract long Read(Stream stream, long length);
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private int seek(cef_read_handler_t* self, long offset, int whence)
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{
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CheckSelf(self);
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return Seek(offset, (SeekOrigin)whence) ? 0 : -1;
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}
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/// <summary>
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/// Seek to the specified offset position. |whence| may be any one of
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/// SEEK_CUR, SEEK_END or SEEK_SET. Return zero on success and non-zero on
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/// failure.
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/// </summary>
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protected abstract bool Seek(long offset, SeekOrigin whence);
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private long tell(cef_read_handler_t* self)
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{
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CheckSelf(self);
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return Tell();
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}
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/// <summary>
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/// Return the current offset position.
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/// </summary>
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protected abstract long Tell();
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private int eof(cef_read_handler_t* self)
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{
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CheckSelf(self);
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return Eof() ? 1 : 0;
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}
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/// <summary>
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/// Return non-zero if at end of file.
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/// </summary>
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protected abstract bool Eof();
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private int may_block(cef_read_handler_t* self)
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{
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CheckSelf(self);
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return MayBlock() ? 1 : 0;
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}
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/// <summary>
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/// Return true if this handler performs work like accessing the file system
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/// which may block. Used as a hint for determining the thread to access the
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/// handler from.
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/// </summary>
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protected abstract bool MayBlock();
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}
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}
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