/// <summary>Adds <paramref name="filter"/> to the list of filters attached to <paramref name="stream"/>.</summary>
/// <param name="stream">The target stream.</param>
/// <param name="filter">The filter name.</param>
/// <param name="read_write">Combination of the <see cref="FilterChainOptions"/> flags.</param>
/// <param name="parameters">Additional parameters for a user filter.</param>
public static bool stream_filter_prepend(PhpResource stream, string filter, FilterChainOptions read_write, PhpValue parameters)
{
var s = PhpStream.GetValid(stream);
if (s == null)
{
return(false);
}
var where = (FilterChainOptions)read_write & FilterChainOptions.ReadWrite;
return(PhpFilter.AddToStream(s, filter, where | FilterChainOptions.Head, parameters));
}
/// <summary>
/// Insert the filter into the filter chains.
/// </summary>
/// <param name="ctx">Runtime context.</param>
/// <param name="stream">Which stream's filter chains.</param>
/// <param name="filter">What filter.</param>
/// <param name="where">What position in the chains.</param>
/// <param name="parameters">Additional parameters for the filter.</param>
/// <returns>True if successful.</returns>
public static bool AddToStream(Context ctx, PhpStream stream, string filter, FilterChainOptions where, PhpValue parameters)
{
PhpFilter readFilter, writeFilter;
if ((stream.Options & StreamAccessOptions.Read) == 0)
{
where &= ~FilterChainOptions.Read;
}
if ((stream.Options & StreamAccessOptions.Write) == 0)
{
where &= ~FilterChainOptions.Write;
}
if ((where & FilterChainOptions.Read) > 0)
{
if (!GetFilter(ctx, filter, true, out readFilter, parameters))
{
//PhpException.Throw(PhpError.Warning, CoreResources.GetString("invalid_filter_name", filter));
//return false;
throw new ArgumentException(nameof(filter));
}
stream.AddFilter(readFilter, where);
readFilter.OnCreate();
// Add to chain, (filters buffers too).
}
if ((where & FilterChainOptions.Write) > 0)
{
if (!GetFilter(ctx, filter, true, out writeFilter, parameters))
{
//PhpException.Throw(PhpError.Warning, CoreResources.GetString("invalid_filter_name", filter));
//return false;
throw new ArgumentException(nameof(filter));
}
stream.AddFilter(writeFilter, where);
writeFilter.OnCreate();
// Add to chain.
}
return(true);
}
/// <summary>
/// Adds a filter to one of the read or write filter chains.
/// </summary>
/// <param name="filter">The filter.</param>
/// <param name="where">The position in the chain.</param>
public void AddFilter(IFilter filter, FilterChainOptions where)
{
Debug.Assert((where & FilterChainOptions.ReadWrite) != FilterChainOptions.ReadWrite);
List<IFilter> list = null;
// Which chain.
if ((where & FilterChainOptions.Read) > 0)
{
if (readFilters == null) readFilters = new List<IFilter>();
list = readFilters;
}
else
{
if (writeFilters == null) writeFilters = new List<IFilter>();
list = writeFilters;
}
// Position in the chain.
if ((where & FilterChainOptions.Tail) > 0)
{
list.Add(filter);
if ((list == readFilters) && (ReadBufferLength > 0))
{
// Process all the data in the read buffers.
var q = new Queue<TextElement>();
foreach (var o in readBuffers)
{
q.Enqueue(filter.Filter(_ctx, o, false));
}
readBuffers = q;
}
}
else
{
list.Insert(0, filter);
}
}
public static PhpResource stream_filter_prepend(Context ctx, PhpResource stream, string filter, FilterChainOptions read_write = FilterChainOptions.ReadWrite, PhpValue parameters = default)
{
var s = PhpStream.GetValid(stream);
if (s == null)
{
return(null); // false;
}
var where = read_write & FilterChainOptions.ReadWrite;
var added = PhpFilter.AddToStream(ctx, s, filter, where | FilterChainOptions.Head, parameters);
//
if (added.readFilter != null || added.writeFilter != null)
{
return(new StreamFilterResource(s, added.writeFilter, added.readFilter));
}
else
{
return(null); // false
}
}
/// <summary>Adds <paramref name="filter"/> to the list of filters attached to <paramref name="stream"/>.</summary>
/// <param name="stream">The target stream.</param>
/// <param name="filter">The filter name.</param>
/// <param name="read_write">Combination of the <see cref="FilterChainOptions"/> flags.</param>
public static bool stream_filter_prepend(PhpResource stream, string filter, FilterChainOptions read_write = FilterChainOptions.ReadWrite)
{
return(stream_filter_prepend(stream, filter, read_write, PhpValue.Null));
}
/// <summary>
/// Insert the filter into the filter chains.
/// </summary>
/// <param name="ctx">Runtime context.</param>
/// <param name="stream">Which stream's filter chains.</param>
/// <param name="filter">What filter.</param>
/// <param name="where">What position in the chains.</param>
/// <param name="parameters">Additional parameters for the filter.</param>
/// <returns>Filters that have been added.</returns>
internal static (PhpFilter readFilter, PhpFilter writeFilter) AddToStream(Context ctx, PhpStream stream, string filter, FilterChainOptions where, PhpValue parameters)
{
if ((stream.Options & StreamAccessOptions.Read) == 0)
{
where &= ~FilterChainOptions.Read;
}
if ((stream.Options & StreamAccessOptions.Write) == 0)
{
where &= ~FilterChainOptions.Write;
}
PhpFilter readFilter = null, writeFilter = null;
if ((where & FilterChainOptions.Read) != 0)
{
if (GetFilter(ctx, filter, true, out readFilter, parameters))
{
stream.AddFilter(readFilter, where);
readFilter.OnCreate();
// Add to chain, (filters buffers too).
}
else
{
PhpException.Throw(PhpError.Warning, Core.Resources.ErrResources.invalid_filter_name, filter);
//return false;
throw new ArgumentException(nameof(filter));
}
}
if ((where & FilterChainOptions.Write) != 0)
{
if (GetFilter(ctx, filter, true, out writeFilter, parameters))
{
stream.AddFilter(writeFilter, where);
writeFilter.OnCreate();
// Add to chain.
}
else
{
PhpException.Throw(PhpError.Warning, Core.Resources.ErrResources.invalid_filter_name, filter);
//return false;
throw new ArgumentException(nameof(filter));
}
}
return(readFilter, writeFilter);
}
/// <summary>
/// Adds a filter to one of the read or write filter chains.
/// </summary>
/// <param name="filter">The filter.</param>
/// <param name="where">The position in the chain.</param>
public void AddFilter(IFilter filter, FilterChainOptions where)
{
Debug.Assert((where & FilterChainOptions.ReadWrite) != FilterChainOptions.ReadWrite);
ArrayList list = null;
// Which chain.
if ((where & FilterChainOptions.Read) > 0)
{
if (readFilters == null) readFilters = new ArrayList();
list = readFilters;
}
else
{
if (writeFilters == null) writeFilters = new ArrayList();
list = writeFilters;
}
// Position in the chain.
if ((where & FilterChainOptions.Tail) > 0)
{
list.Add(filter);
if ((list == readFilters) && (ReadBufferLength > 0))
{
// Process all the data in the read buffers.
Queue q = new Queue();
foreach (object o in readBuffers)
q.Enqueue(filter.Filter(o, false));
readBuffers = q;
}
}
else
{
list.Insert(0, filter);
}
}
