/*
 * Licensed under the GNU Lesser General Public License Version 3
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the license, or
 * (at your option) any later version.
 *
 * This software 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

// generated automatically - do not change


module gio.InputStream;

private import gio.AsyncResultIF;
private import gio.Cancellable;
private import gio.c.functions;
public  import gio.c.types;
private import glib.Bytes;
private import glib.ErrorG;
private import glib.GException;
private import gobject.ObjectG;


/**
 * #GInputStream has functions to read from a stream (g_input_stream_read()),
 * to close a stream (g_input_stream_close()) and to skip some content
 * (g_input_stream_skip()).
 * 
 * To copy the content of an input stream to an output stream without
 * manually handling the reads and writes, use g_output_stream_splice().
 * 
 * All of these functions have async variants too.
 */
public class InputStream : ObjectG
{
	/** the main Gtk struct */
	protected GInputStream* gInputStream;

	/** Get the main Gtk struct */
	public GInputStream* getInputStreamStruct(bool transferOwnership = false)
	{
		if (transferOwnership)
			ownedRef = false;
		return gInputStream;
	}

	/** the main Gtk struct as a void* */
	protected override void* getStruct()
	{
		return cast(void*)gInputStream;
	}

	protected override void setStruct(GObject* obj)
	{
		gInputStream = cast(GInputStream*)obj;
		super.setStruct(obj);
	}

	/**
	 * Sets our main struct and passes it to the parent class.
	 */
	public this (GInputStream* gInputStream, bool ownedRef = false)
	{
		this.gInputStream = gInputStream;
		super(cast(GObject*)gInputStream, ownedRef);
	}


	/** */
	public static GType getType()
	{
		return g_input_stream_get_type();
	}

	/**
	 * Clears the pending flag on @stream.
	 */
	public void clearPending()
	{
		g_input_stream_clear_pending(gInputStream);
	}

	/**
	 * Closes the stream, releasing resources related to it.
	 *
	 * Once the stream is closed, all other operations will return %G_IO_ERROR_CLOSED.
	 * Closing a stream multiple times will not return an error.
	 *
	 * Streams will be automatically closed when the last reference
	 * is dropped, but you might want to call this function to make sure
	 * resources are released as early as possible.
	 *
	 * Some streams might keep the backing store of the stream (e.g. a file descriptor)
	 * open after the stream is closed. See the documentation for the individual
	 * stream for details.
	 *
	 * On failure the first error that happened will be reported, but the close
	 * operation will finish as much as possible. A stream that failed to
	 * close will still return %G_IO_ERROR_CLOSED for all operations. Still, it
	 * is important to check and report the error to the user.
	 *
	 * If @cancellable is not %NULL, then the operation can be cancelled by
	 * triggering the cancellable object from another thread. If the operation
	 * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
	 * Cancelling a close will still leave the stream closed, but some streams
	 * can use a faster close that doesn't block to e.g. check errors.
	 *
	 * Params:
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *
	 * Returns: %TRUE on success, %FALSE on failure
	 *
	 * Throws: GException on failure.
	 */
	public bool close(Cancellable cancellable)
	{
		GError* err = null;

		auto p = g_input_stream_close(gInputStream, (cancellable is null) ? null : cancellable.getCancellableStruct(), &err) != 0;

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Requests an asynchronous closes of the stream, releasing resources related to it.
	 * When the operation is finished @callback will be called.
	 * You can then call g_input_stream_close_finish() to get the result of the
	 * operation.
	 *
	 * For behaviour details see g_input_stream_close().
	 *
	 * The asyncronous methods have a default fallback that uses threads to implement
	 * asynchronicity, so they are optional for inheriting classes. However, if you
	 * override one you must override all.
	 *
	 * Params:
	 *     ioPriority = the [I/O priority][io-priority] of the request
	 *     cancellable = optional cancellable object
	 *     callback = callback to call when the request is satisfied
	 *     userData = the data to pass to callback function
	 */
	public void closeAsync(int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)
	{
		g_input_stream_close_async(gInputStream, ioPriority, (cancellable is null) ? null : cancellable.getCancellableStruct(), callback, userData);
	}

	/**
	 * Finishes closing a stream asynchronously, started from g_input_stream_close_async().
	 *
	 * Params:
	 *     result = a #GAsyncResult.
	 *
	 * Returns: %TRUE if the stream was closed successfully.
	 *
	 * Throws: GException on failure.
	 */
	public bool closeFinish(AsyncResultIF result)
	{
		GError* err = null;

		auto p = g_input_stream_close_finish(gInputStream, (result is null) ? null : result.getAsyncResultStruct(), &err) != 0;

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Checks if an input stream has pending actions.
	 *
	 * Returns: %TRUE if @stream has pending actions.
	 */
	public bool hasPending()
	{
		return g_input_stream_has_pending(gInputStream) != 0;
	}

	/**
	 * Checks if an input stream is closed.
	 *
	 * Returns: %TRUE if the stream is closed.
	 */
	public bool isClosed()
	{
		return g_input_stream_is_closed(gInputStream) != 0;
	}

	/**
	 * Tries to read @count bytes from the stream into the buffer starting at
	 * @buffer. Will block during this read.
	 *
	 * If count is zero returns zero and does nothing. A value of @count
	 * larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
	 *
	 * On success, the number of bytes read into the buffer is returned.
	 * It is not an error if this is not the same as the requested size, as it
	 * can happen e.g. near the end of a file. Zero is returned on end of file
	 * (or if @count is zero),  but never otherwise.
	 *
	 * The returned @buffer is not a nul-terminated string, it can contain nul bytes
	 * at any position, and this function doesn't nul-terminate the @buffer.
	 *
	 * If @cancellable is not %NULL, then the operation can be cancelled by
	 * triggering the cancellable object from another thread. If the operation
	 * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
	 * operation was partially finished when the operation was cancelled the
	 * partial result will be returned, without an error.
	 *
	 * On error -1 is returned and @error is set accordingly.
	 *
	 * Params:
	 *     buffer = a buffer to
	 *         read data into (which should be at least count bytes long).
	 *     count = the number of bytes that will be read from the stream
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *
	 * Returns: Number of bytes read, or -1 on error, or 0 on end of file.
	 *
	 * Throws: GException on failure.
	 */
	public ptrdiff_t read(ubyte[] buffer, Cancellable cancellable)
	{
		GError* err = null;

		auto p = g_input_stream_read(gInputStream, buffer.ptr, cast(size_t)buffer.length, (cancellable is null) ? null : cancellable.getCancellableStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Tries to read @count bytes from the stream into the buffer starting at
	 * @buffer. Will block during this read.
	 *
	 * This function is similar to g_input_stream_read(), except it tries to
	 * read as many bytes as requested, only stopping on an error or end of stream.
	 *
	 * On a successful read of @count bytes, or if we reached the end of the
	 * stream,  %TRUE is returned, and @bytes_read is set to the number of bytes
	 * read into @buffer.
	 *
	 * If there is an error during the operation %FALSE is returned and @error
	 * is set to indicate the error status.
	 *
	 * As a special exception to the normal conventions for functions that
	 * use #GError, if this function returns %FALSE (and sets @error) then
	 * @bytes_read will be set to the number of bytes that were successfully
	 * read before the error was encountered.  This functionality is only
	 * available from C.  If you need it from another language then you must
	 * write your own loop around g_input_stream_read().
	 *
	 * Params:
	 *     buffer = a buffer to
	 *         read data into (which should be at least count bytes long).
	 *     count = the number of bytes that will be read from the stream
	 *     bytesRead = location to store the number of bytes that was read from the stream
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *
	 * Returns: %TRUE on success, %FALSE if there was an error
	 *
	 * Throws: GException on failure.
	 */
	public bool readAll(ubyte[] buffer, out size_t bytesRead, Cancellable cancellable)
	{
		GError* err = null;

		auto p = g_input_stream_read_all(gInputStream, buffer.ptr, cast(size_t)buffer.length, &bytesRead, (cancellable is null) ? null : cancellable.getCancellableStruct(), &err) != 0;

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Request an asynchronous read of @count bytes from the stream into the
	 * buffer starting at @buffer.
	 *
	 * This is the asynchronous equivalent of g_input_stream_read_all().
	 *
	 * Call g_input_stream_read_all_finish() to collect the result.
	 *
	 * Any outstanding I/O request with higher priority (lower numerical
	 * value) will be executed before an outstanding request with lower
	 * priority. Default priority is %G_PRIORITY_DEFAULT.
	 *
	 * Params:
	 *     buffer = a buffer to
	 *         read data into (which should be at least count bytes long)
	 *     count = the number of bytes that will be read from the stream
	 *     ioPriority = the [I/O priority][io-priority] of the request
	 *     cancellable = optional #GCancellable object, %NULL to ignore
	 *     callback = callback to call when the request is satisfied
	 *     userData = the data to pass to callback function
	 *
	 * Since: 2.44
	 */
	public void readAllAsync(ubyte[] buffer, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)
	{
		g_input_stream_read_all_async(gInputStream, buffer.ptr, cast(size_t)buffer.length, ioPriority, (cancellable is null) ? null : cancellable.getCancellableStruct(), callback, userData);
	}

	/**
	 * Finishes an asynchronous stream read operation started with
	 * g_input_stream_read_all_async().
	 *
	 * As a special exception to the normal conventions for functions that
	 * use #GError, if this function returns %FALSE (and sets @error) then
	 * @bytes_read will be set to the number of bytes that were successfully
	 * read before the error was encountered.  This functionality is only
	 * available from C.  If you need it from another language then you must
	 * write your own loop around g_input_stream_read_async().
	 *
	 * Params:
	 *     result = a #GAsyncResult
	 *     bytesRead = location to store the number of bytes that was read from the stream
	 *
	 * Returns: %TRUE on success, %FALSE if there was an error
	 *
	 * Since: 2.44
	 *
	 * Throws: GException on failure.
	 */
	public bool readAllFinish(AsyncResultIF result, out size_t bytesRead)
	{
		GError* err = null;

		auto p = g_input_stream_read_all_finish(gInputStream, (result is null) ? null : result.getAsyncResultStruct(), &bytesRead, &err) != 0;

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Request an asynchronous read of @count bytes from the stream into the buffer
	 * starting at @buffer. When the operation is finished @callback will be called.
	 * You can then call g_input_stream_read_finish() to get the result of the
	 * operation.
	 *
	 * During an async request no other sync and async calls are allowed on @stream, and will
	 * result in %G_IO_ERROR_PENDING errors.
	 *
	 * A value of @count larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
	 *
	 * On success, the number of bytes read into the buffer will be passed to the
	 * callback. It is not an error if this is not the same as the requested size, as it
	 * can happen e.g. near the end of a file, but generally we try to read
	 * as many bytes as requested. Zero is returned on end of file
	 * (or if @count is zero),  but never otherwise.
	 *
	 * Any outstanding i/o request with higher priority (lower numerical value) will
	 * be executed before an outstanding request with lower priority. Default
	 * priority is %G_PRIORITY_DEFAULT.
	 *
	 * The asyncronous methods have a default fallback that uses threads to implement
	 * asynchronicity, so they are optional for inheriting classes. However, if you
	 * override one you must override all.
	 *
	 * Params:
	 *     buffer = a buffer to
	 *         read data into (which should be at least count bytes long).
	 *     count = the number of bytes that will be read from the stream
	 *     ioPriority = the [I/O priority][io-priority]
	 *         of the request.
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *     callback = callback to call when the request is satisfied
	 *     userData = the data to pass to callback function
	 */
	public void readAsync(ubyte[] buffer, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)
	{
		g_input_stream_read_async(gInputStream, buffer.ptr, cast(size_t)buffer.length, ioPriority, (cancellable is null) ? null : cancellable.getCancellableStruct(), callback, userData);
	}

	/**
	 * Like g_input_stream_read(), this tries to read @count bytes from
	 * the stream in a blocking fashion. However, rather than reading into
	 * a user-supplied buffer, this will create a new #GBytes containing
	 * the data that was read. This may be easier to use from language
	 * bindings.
	 *
	 * If count is zero, returns a zero-length #GBytes and does nothing. A
	 * value of @count larger than %G_MAXSSIZE will cause a
	 * %G_IO_ERROR_INVALID_ARGUMENT error.
	 *
	 * On success, a new #GBytes is returned. It is not an error if the
	 * size of this object is not the same as the requested size, as it
	 * can happen e.g. near the end of a file. A zero-length #GBytes is
	 * returned on end of file (or if @count is zero), but never
	 * otherwise.
	 *
	 * If @cancellable is not %NULL, then the operation can be cancelled by
	 * triggering the cancellable object from another thread. If the operation
	 * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
	 * operation was partially finished when the operation was cancelled the
	 * partial result will be returned, without an error.
	 *
	 * On error %NULL is returned and @error is set accordingly.
	 *
	 * Params:
	 *     count = maximum number of bytes that will be read from the stream. Common
	 *         values include 4096 and 8192.
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *
	 * Returns: a new #GBytes, or %NULL on error
	 *
	 * Since: 2.34
	 *
	 * Throws: GException on failure.
	 */
	public Bytes readBytes(size_t count, Cancellable cancellable)
	{
		GError* err = null;

		auto p = g_input_stream_read_bytes(gInputStream, count, (cancellable is null) ? null : cancellable.getCancellableStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		if(p is null)
		{
			return null;
		}

		return new Bytes(cast(GBytes*) p, true);
	}

	/**
	 * Request an asynchronous read of @count bytes from the stream into a
	 * new #GBytes. When the operation is finished @callback will be
	 * called. You can then call g_input_stream_read_bytes_finish() to get the
	 * result of the operation.
	 *
	 * During an async request no other sync and async calls are allowed
	 * on @stream, and will result in %G_IO_ERROR_PENDING errors.
	 *
	 * A value of @count larger than %G_MAXSSIZE will cause a
	 * %G_IO_ERROR_INVALID_ARGUMENT error.
	 *
	 * On success, the new #GBytes will be passed to the callback. It is
	 * not an error if this is smaller than the requested size, as it can
	 * happen e.g. near the end of a file, but generally we try to read as
	 * many bytes as requested. Zero is returned on end of file (or if
	 * @count is zero), but never otherwise.
	 *
	 * Any outstanding I/O request with higher priority (lower numerical
	 * value) will be executed before an outstanding request with lower
	 * priority. Default priority is %G_PRIORITY_DEFAULT.
	 *
	 * Params:
	 *     count = the number of bytes that will be read from the stream
	 *     ioPriority = the [I/O priority][io-priority] of the request
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *     callback = callback to call when the request is satisfied
	 *     userData = the data to pass to callback function
	 *
	 * Since: 2.34
	 */
	public void readBytesAsync(size_t count, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)
	{
		g_input_stream_read_bytes_async(gInputStream, count, ioPriority, (cancellable is null) ? null : cancellable.getCancellableStruct(), callback, userData);
	}

	/**
	 * Finishes an asynchronous stream read-into-#GBytes operation.
	 *
	 * Params:
	 *     result = a #GAsyncResult.
	 *
	 * Returns: the newly-allocated #GBytes, or %NULL on error
	 *
	 * Since: 2.34
	 *
	 * Throws: GException on failure.
	 */
	public Bytes readBytesFinish(AsyncResultIF result)
	{
		GError* err = null;

		auto p = g_input_stream_read_bytes_finish(gInputStream, (result is null) ? null : result.getAsyncResultStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		if(p is null)
		{
			return null;
		}

		return new Bytes(cast(GBytes*) p, true);
	}

	/**
	 * Finishes an asynchronous stream read operation.
	 *
	 * Params:
	 *     result = a #GAsyncResult.
	 *
	 * Returns: number of bytes read in, or -1 on error, or 0 on end of file.
	 *
	 * Throws: GException on failure.
	 */
	public ptrdiff_t readFinish(AsyncResultIF result)
	{
		GError* err = null;

		auto p = g_input_stream_read_finish(gInputStream, (result is null) ? null : result.getAsyncResultStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Sets @stream to have actions pending. If the pending flag is
	 * already set or @stream is closed, it will return %FALSE and set
	 * @error.
	 *
	 * Returns: %TRUE if pending was previously unset and is now set.
	 *
	 * Throws: GException on failure.
	 */
	public bool setPending()
	{
		GError* err = null;

		auto p = g_input_stream_set_pending(gInputStream, &err) != 0;

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Tries to skip @count bytes from the stream. Will block during the operation.
	 *
	 * This is identical to g_input_stream_read(), from a behaviour standpoint,
	 * but the bytes that are skipped are not returned to the user. Some
	 * streams have an implementation that is more efficient than reading the data.
	 *
	 * This function is optional for inherited classes, as the default implementation
	 * emulates it using read.
	 *
	 * If @cancellable is not %NULL, then the operation can be cancelled by
	 * triggering the cancellable object from another thread. If the operation
	 * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
	 * operation was partially finished when the operation was cancelled the
	 * partial result will be returned, without an error.
	 *
	 * Params:
	 *     count = the number of bytes that will be skipped from the stream
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *
	 * Returns: Number of bytes skipped, or -1 on error
	 *
	 * Throws: GException on failure.
	 */
	public ptrdiff_t skip(size_t count, Cancellable cancellable)
	{
		GError* err = null;

		auto p = g_input_stream_skip(gInputStream, count, (cancellable is null) ? null : cancellable.getCancellableStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}

	/**
	 * Request an asynchronous skip of @count bytes from the stream.
	 * When the operation is finished @callback will be called.
	 * You can then call g_input_stream_skip_finish() to get the result
	 * of the operation.
	 *
	 * During an async request no other sync and async calls are allowed,
	 * and will result in %G_IO_ERROR_PENDING errors.
	 *
	 * A value of @count larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
	 *
	 * On success, the number of bytes skipped will be passed to the callback.
	 * It is not an error if this is not the same as the requested size, as it
	 * can happen e.g. near the end of a file, but generally we try to skip
	 * as many bytes as requested. Zero is returned on end of file
	 * (or if @count is zero), but never otherwise.
	 *
	 * Any outstanding i/o request with higher priority (lower numerical value)
	 * will be executed before an outstanding request with lower priority.
	 * Default priority is %G_PRIORITY_DEFAULT.
	 *
	 * The asynchronous methods have a default fallback that uses threads to
	 * implement asynchronicity, so they are optional for inheriting classes.
	 * However, if you override one, you must override all.
	 *
	 * Params:
	 *     count = the number of bytes that will be skipped from the stream
	 *     ioPriority = the [I/O priority][io-priority] of the request
	 *     cancellable = optional #GCancellable object, %NULL to ignore.
	 *     callback = callback to call when the request is satisfied
	 *     userData = the data to pass to callback function
	 */
	public void skipAsync(size_t count, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)
	{
		g_input_stream_skip_async(gInputStream, count, ioPriority, (cancellable is null) ? null : cancellable.getCancellableStruct(), callback, userData);
	}

	/**
	 * Finishes a stream skip operation.
	 *
	 * Params:
	 *     result = a #GAsyncResult.
	 *
	 * Returns: the size of the bytes skipped, or %-1 on error.
	 *
	 * Throws: GException on failure.
	 */
	public ptrdiff_t skipFinish(AsyncResultIF result)
	{
		GError* err = null;

		auto p = g_input_stream_skip_finish(gInputStream, (result is null) ? null : result.getAsyncResultStruct(), &err);

		if (err !is null)
		{
			throw new GException( new ErrorG(err) );
		}

		return p;
	}
}