/* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2006-2007 Red Hat, Inc. * Copyright (C) 2007 Jürg Billeter * * 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 2 of the License, or (at your option) any later version. * * This library 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, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * Author: Christian Kellner */ #include #include "gbufferedinputstream.h" #include "ginputstream.h" #include "gsimpleasyncresult.h" #include #include "glibintl.h" #include "gioalias.h" /** * SECTION:gbufferedinputstream * @short_description: Buffered Input Stream * @include: gio.h * @see_also: #GFilterInputStream, #GInputStream * * Buffered input stream implements #GFilterInputStream and provides * for buffered reads. * * By default, #GBufferedInputStream's buffer size is set at 4 kilobytes. * * To create a buffered input stream, use g_buffered_input_stream_new(), * or g_buffered_input_stream_new_sized() to specify the buffer's size at * construction. * * To get the size of a buffer within a buffered input stream, use * g_buffered_input_stream_get_buffer_size(). To change the size of a * buffered input stream's buffer, use * g_buffered_input_stream_set_buffer_size(). Note that the buffer's size * cannot be reduced below the size of the data within the buffer. * **/ #define DEFAULT_BUFFER_SIZE 4096 struct _GBufferedInputStreamPrivate { guint8 *buffer; gsize len; gsize pos; gsize end; GAsyncReadyCallback outstanding_callback; }; enum { PROP_0, PROP_BUFSIZE }; static void g_buffered_input_stream_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void g_buffered_input_stream_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void g_buffered_input_stream_finalize (GObject *object); static gssize g_buffered_input_stream_skip (GInputStream *stream, gsize count, GCancellable *cancellable, GError **error); static void g_buffered_input_stream_skip_async (GInputStream *stream, gsize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); static gssize g_buffered_input_stream_skip_finish (GInputStream *stream, GAsyncResult *result, GError **error); static gssize g_buffered_input_stream_read (GInputStream *stream, void *buffer, gsize count, GCancellable *cancellable, GError **error); static void g_buffered_input_stream_read_async (GInputStream *stream, void *buffer, gsize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); static gssize g_buffered_input_stream_read_finish (GInputStream *stream, GAsyncResult *result, GError **error); static gssize g_buffered_input_stream_real_fill (GBufferedInputStream *stream, gssize count, GCancellable *cancellable, GError **error); static void g_buffered_input_stream_real_fill_async (GBufferedInputStream *stream, gssize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); static gssize g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream, GAsyncResult *result, GError **error); static void compact_buffer (GBufferedInputStream *stream); G_DEFINE_TYPE (GBufferedInputStream, g_buffered_input_stream, G_TYPE_FILTER_INPUT_STREAM) static void g_buffered_input_stream_class_init (GBufferedInputStreamClass *klass) { GObjectClass *object_class; GInputStreamClass *istream_class; GBufferedInputStreamClass *bstream_class; g_type_class_add_private (klass, sizeof (GBufferedInputStreamPrivate)); object_class = G_OBJECT_CLASS (klass); object_class->get_property = g_buffered_input_stream_get_property; object_class->set_property = g_buffered_input_stream_set_property; object_class->finalize = g_buffered_input_stream_finalize; istream_class = G_INPUT_STREAM_CLASS (klass); istream_class->skip = g_buffered_input_stream_skip; istream_class->skip_async = g_buffered_input_stream_skip_async; istream_class->skip_finish = g_buffered_input_stream_skip_finish; istream_class->read_fn = g_buffered_input_stream_read; istream_class->read_async = g_buffered_input_stream_read_async; istream_class->read_finish = g_buffered_input_stream_read_finish; bstream_class = G_BUFFERED_INPUT_STREAM_CLASS (klass); bstream_class->fill = g_buffered_input_stream_real_fill; bstream_class->fill_async = g_buffered_input_stream_real_fill_async; bstream_class->fill_finish = g_buffered_input_stream_real_fill_finish; g_object_class_install_property (object_class, PROP_BUFSIZE, g_param_spec_uint ("buffer-size", P_("Buffer Size"), P_("The size of the backend buffer"), 1, G_MAXUINT, DEFAULT_BUFFER_SIZE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB)); } /** * g_buffered_input_stream_get_buffer_size: * @stream: #GBufferedInputStream. * * Gets the size of the input buffer. * * Returns: the current buffer size. **/ gsize g_buffered_input_stream_get_buffer_size (GBufferedInputStream *stream) { g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), 0); return stream->priv->len; } /** * g_buffered_input_stream_set_buffer_size: * @stream: #GBufferedInputStream. * @size: a #gsize. * * Sets the size of the internal buffer of @stream to @size, or to the * size of the contents of the buffer. The buffer can never be resized * smaller than its current contents. **/ void g_buffered_input_stream_set_buffer_size (GBufferedInputStream *stream, gsize size) { GBufferedInputStreamPrivate *priv; gsize in_buffer; guint8 *buffer; g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream)); priv = stream->priv; if (priv->len == size) return; if (priv->buffer) { in_buffer = priv->end - priv->pos; /* Never resize smaller than current buffer contents */ size = MAX (size, in_buffer); buffer = g_malloc (size); memcpy (buffer, priv->buffer + priv->pos, in_buffer); priv->len = size; priv->pos = 0; priv->end = in_buffer; g_free (priv->buffer); priv->buffer = buffer; } else { priv->len = size; priv->pos = 0; priv->end = 0; priv->buffer = g_malloc (size); } g_object_notify (G_OBJECT (stream), "buffer-size"); } static void g_buffered_input_stream_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GBufferedInputStreamPrivate *priv; GBufferedInputStream *bstream; bstream = G_BUFFERED_INPUT_STREAM (object); priv = bstream->priv; switch (prop_id) { case PROP_BUFSIZE: g_buffered_input_stream_set_buffer_size (bstream, g_value_get_uint (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_buffered_input_stream_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GBufferedInputStreamPrivate *priv; GBufferedInputStream *bstream; bstream = G_BUFFERED_INPUT_STREAM (object); priv = bstream->priv; switch (prop_id) { case PROP_BUFSIZE: g_value_set_uint (value, priv->len); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_buffered_input_stream_finalize (GObject *object) { GBufferedInputStreamPrivate *priv; GBufferedInputStream *stream; stream = G_BUFFERED_INPUT_STREAM (object); priv = stream->priv; g_free (priv->buffer); if (G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize) (*G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize) (object); } static void g_buffered_input_stream_init (GBufferedInputStream *stream) { stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream, G_TYPE_BUFFERED_INPUT_STREAM, GBufferedInputStreamPrivate); } /** * g_buffered_input_stream_new: * @base_stream: a #GInputStream. * * Creates a new #GInputStream from the given @base_stream, with * a buffer set to the default size (4 kilobytes). * * Returns: a #GInputStream for the given @base_stream. **/ GInputStream * g_buffered_input_stream_new (GInputStream *base_stream) { GInputStream *stream; g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL); stream = g_object_new (G_TYPE_BUFFERED_INPUT_STREAM, "base-stream", base_stream, NULL); return stream; } /** * g_buffered_input_stream_new_sized: * @base_stream: a #GOutputStream. * @size: a #gsize. * * Creates a new #GBufferedInputStream from the given @base_stream, * with a buffer set to @size. * * Returns: a #GInputStream. **/ GInputStream * g_buffered_input_stream_new_sized (GInputStream *base_stream, gsize size) { GInputStream *stream; g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL); stream = g_object_new (G_TYPE_BUFFERED_INPUT_STREAM, "base-stream", base_stream, "buffer-size", (guint)size, NULL); return stream; } /** * g_buffered_input_stream_fill: * @stream: #GBufferedInputStream. * @count: the number of bytes that will be read from the stream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: location to store the error occuring, or %NULL to ignore. * * Tries to read @count bytes from the stream into the 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. * * 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. * * For the asynchronous, non-blocking, version of this function, see * g_buffered_input_stream_fill_async(). * * Returns: the number of bytes read into @stream's buffer, up to @count, * or -1 on error. **/ gssize g_buffered_input_stream_fill (GBufferedInputStream *stream, gssize count, GCancellable *cancellable, GError **error) { GBufferedInputStreamClass *class; GInputStream *input_stream; gssize res; g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1); input_stream = G_INPUT_STREAM (stream); if (!g_input_stream_set_pending (input_stream, error)) return -1; if (cancellable) g_cancellable_push_current (cancellable); class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); res = class->fill (stream, count, cancellable, error); if (cancellable) g_cancellable_pop_current (cancellable); g_input_stream_clear_pending (input_stream); return res; } static void async_fill_callback_wrapper (GObject *source_object, GAsyncResult *res, gpointer user_data) { GBufferedInputStream *stream = G_BUFFERED_INPUT_STREAM (source_object); g_input_stream_clear_pending (G_INPUT_STREAM (stream)); (*stream->priv->outstanding_callback) (source_object, res, user_data); g_object_unref (stream); } /** * g_buffered_input_stream_fill_async: * @stream: #GBufferedInputStream. * @count: a #gssize. * @io_priority: the I/O priority * of the request. * @cancellable: optional #GCancellable object * @callback: a #GAsyncReadyCallback. * @user_data: a #gpointer. * * Reads data into @stream's buffer asynchronously, up to @count size. * @io_priority can be used to prioritize reads. For the synchronous * version of this function, see g_buffered_input_stream_fill(). **/ void g_buffered_input_stream_fill_async (GBufferedInputStream *stream, gssize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GBufferedInputStreamClass *class; GSimpleAsyncResult *simple; GError *error = NULL; g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream)); if (count == 0) { simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_buffered_input_stream_fill_async); g_simple_async_result_complete_in_idle (simple); g_object_unref (simple); return; } if (((gssize) count) < 0) { g_simple_async_report_error_in_idle (G_OBJECT (stream), callback, user_data, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("Too large count value passed to g_input_stream_read_async")); return; } if (!g_input_stream_set_pending (G_INPUT_STREAM (stream), &error)) { g_simple_async_report_gerror_in_idle (G_OBJECT (stream), callback, user_data, error); g_error_free (error); return; } class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); stream->priv->outstanding_callback = callback; g_object_ref (stream); class->fill_async (stream, count, io_priority, cancellable, async_fill_callback_wrapper, user_data); } /** * g_buffered_input_stream_fill_finish: * @stream: a #GBufferedInputStream. * @result: a #GAsyncResult. * @error: a #GError. * * Finishes an asynchronous read. * * Returns: a #gssize of the read stream, or %-1 on an error. **/ gssize g_buffered_input_stream_fill_finish (GBufferedInputStream *stream, GAsyncResult *result, GError **error) { GSimpleAsyncResult *simple; GBufferedInputStreamClass *class; g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1); g_return_val_if_fail (G_IS_ASYNC_RESULT (result), -1); if (G_IS_SIMPLE_ASYNC_RESULT (result)) { simple = G_SIMPLE_ASYNC_RESULT (result); if (g_simple_async_result_propagate_error (simple, error)) return -1; /* Special case read of 0 bytes */ if (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_fill_async) return 0; } class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); return class->fill_finish (stream, result, error); } /** * g_buffered_input_stream_get_available: * @stream: #GBufferedInputStream. * * Gets the size of the available data within the stream. * * Returns: size of the available stream. **/ gsize g_buffered_input_stream_get_available (GBufferedInputStream *stream) { g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1); return stream->priv->end - stream->priv->pos; } /** * g_buffered_input_stream_peek: * @stream: a #GBufferedInputStream. * @buffer: a pointer to an allocated chunk of memory. * @offset: a #gsize. * @count: a #gsize. * * Peeks in the buffer, copying data of size @count into @buffer, * offset @offset bytes. * * Returns: a #gsize of the number of bytes peeked, or %-1 on error. **/ gsize g_buffered_input_stream_peek (GBufferedInputStream *stream, void *buffer, gsize offset, gsize count) { gsize available; gsize end; g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1); g_return_val_if_fail (buffer != NULL, -1); available = g_buffered_input_stream_get_available (stream); if (offset > available) return 0; end = MIN (offset + count, available); count = end - offset; memcpy (buffer, stream->priv->buffer + stream->priv->pos + offset, count); return count; } /** * g_buffered_input_stream_peek_buffer: * @stream: a #GBufferedInputStream. * @count: a #gsize to get the number of bytes available in the buffer. * * Returns the buffer with the currently available bytes. The returned * buffer must not be modified and will become invalid when reading from * the stream or filling the buffer. * * Returns: read-only buffer **/ const void* g_buffered_input_stream_peek_buffer (GBufferedInputStream *stream, gsize *count) { GBufferedInputStreamPrivate *priv; g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), NULL); priv = stream->priv; if (count) *count = priv->end - priv->pos; return priv->buffer + priv->pos; } static void compact_buffer (GBufferedInputStream *stream) { GBufferedInputStreamPrivate *priv; gsize current_size; priv = stream->priv; current_size = priv->end - priv->pos; g_memmove (priv->buffer, priv->buffer + priv->pos, current_size); priv->pos = 0; priv->end = current_size; } static gssize g_buffered_input_stream_real_fill (GBufferedInputStream *stream, gssize count, GCancellable *cancellable, GError **error) { GBufferedInputStreamPrivate *priv; GInputStream *base_stream; gssize nread; gsize in_buffer; priv = stream->priv; if (count == -1) count = priv->len; in_buffer = priv->end - priv->pos; /* Never fill more than can fit in the buffer */ count = MIN (count, priv->len - in_buffer); /* If requested length does not fit at end, compact */ if (priv->len - priv->end < count) compact_buffer (stream); base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; nread = g_input_stream_read (base_stream, priv->buffer + priv->end, count, cancellable, error); if (nread > 0) priv->end += nread; return nread; } static gssize g_buffered_input_stream_skip (GInputStream *stream, gsize count, GCancellable *cancellable, GError **error) { GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; GBufferedInputStreamClass *class; GInputStream *base_stream; gsize available, bytes_skipped; gssize nread; bstream = G_BUFFERED_INPUT_STREAM (stream); priv = bstream->priv; available = priv->end - priv->pos; if (count <= available) { priv->pos += count; return count; } /* Full request not available, skip all currently available and * request refill for more */ priv->pos = 0; priv->end = 0; bytes_skipped = available; count -= available; if (bytes_skipped > 0) error = NULL; /* Ignore further errors if we already read some data */ if (count > priv->len) { /* Large request, shortcut buffer */ base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; nread = g_input_stream_skip (base_stream, count, cancellable, error); if (nread < 0 && bytes_skipped == 0) return -1; if (nread > 0) bytes_skipped += nread; return bytes_skipped; } class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); nread = class->fill (bstream, priv->len, cancellable, error); if (nread < 0) { if (bytes_skipped == 0) return -1; else return bytes_skipped; } available = priv->end - priv->pos; count = MIN (count, available); bytes_skipped += count; priv->pos += count; return bytes_skipped; } static gssize g_buffered_input_stream_read (GInputStream *stream, void *buffer, gsize count, GCancellable *cancellable, GError **error) { GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; GBufferedInputStreamClass *class; GInputStream *base_stream; gsize available, bytes_read; gssize nread; bstream = G_BUFFERED_INPUT_STREAM (stream); priv = bstream->priv; available = priv->end - priv->pos; if (count <= available) { memcpy (buffer, priv->buffer + priv->pos, count); priv->pos += count; return count; } /* Full request not available, read all currently availbile and request refill for more */ memcpy (buffer, priv->buffer + priv->pos, available); priv->pos = 0; priv->end = 0; bytes_read = available; count -= available; if (bytes_read > 0) error = NULL; /* Ignore further errors if we already read some data */ if (count > priv->len) { /* Large request, shortcut buffer */ base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; nread = g_input_stream_read (base_stream, (char *)buffer + bytes_read, count, cancellable, error); if (nread < 0 && bytes_read == 0) return -1; if (nread > 0) bytes_read += nread; return bytes_read; } class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); nread = class->fill (bstream, priv->len, cancellable, error); if (nread < 0) { if (bytes_read == 0) return -1; else return bytes_read; } available = priv->end - priv->pos; count = MIN (count, available); memcpy ((char *)buffer + bytes_read, (char *)priv->buffer + priv->pos, count); bytes_read += count; priv->pos += count; return bytes_read; } /** * g_buffered_input_stream_read_byte: * @stream: #GBufferedInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: location to store the error occuring, or %NULL to ignore. * * Tries to read a single byte from the stream or the buffer. Will block * during this read. * * On success, the byte read from the stream is returned. On end of stream * -1 is returned but it's not an exceptional error and @error is not set. * * 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. * * Returns: the byte read from the @stream, or -1 on end of stream or error. **/ int g_buffered_input_stream_read_byte (GBufferedInputStream *stream, GCancellable *cancellable, GError **error) { GBufferedInputStreamPrivate *priv; GBufferedInputStreamClass *class; GInputStream *input_stream; gsize available; gssize nread; g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1); priv = stream->priv; input_stream = G_INPUT_STREAM (stream); if (g_input_stream_is_closed (input_stream)) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_CLOSED, _("Stream is already closed")); return -1; } if (!g_input_stream_set_pending (input_stream, error)) return -1; available = priv->end - priv->pos; if (available < 1) { g_input_stream_clear_pending (input_stream); return priv->buffer[priv->pos++]; } /* Byte not available, request refill for more */ if (cancellable) g_cancellable_push_current (cancellable); priv->pos = 0; priv->end = 0; class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); nread = class->fill (stream, priv->len, cancellable, error); if (cancellable) g_cancellable_pop_current (cancellable); g_input_stream_clear_pending (input_stream); if (nread <= 0) return -1; /* error or end of stream */ return priv->buffer[priv->pos++]; } /* ************************** */ /* Async stuff implementation */ /* ************************** */ static void fill_async_callback (GObject *source_object, GAsyncResult *result, gpointer user_data) { GError *error; gssize res; GSimpleAsyncResult *simple; simple = user_data; error = NULL; res = g_input_stream_read_finish (G_INPUT_STREAM (source_object), result, &error); g_simple_async_result_set_op_res_gssize (simple, res); if (res == -1) { g_simple_async_result_set_from_error (simple, error); g_error_free (error); } /* Complete immediately, not in idle, since we're already in a mainloop callout */ g_simple_async_result_complete (simple); g_object_unref (simple); } static void g_buffered_input_stream_real_fill_async (GBufferedInputStream *stream, gssize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GBufferedInputStreamPrivate *priv; GInputStream *base_stream; GSimpleAsyncResult *simple; gsize in_buffer; priv = stream->priv; if (count == -1) count = priv->len; in_buffer = priv->end - priv->pos; /* Never fill more than can fit in the buffer */ count = MIN (count, priv->len - in_buffer); /* If requested length does not fit at end, compact */ if (priv->len - priv->end < count) compact_buffer (stream); simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_buffered_input_stream_real_fill_async); base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; g_input_stream_read_async (base_stream, priv->buffer + priv->end, count, io_priority, cancellable, fill_async_callback, simple); } static gssize g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream, GAsyncResult *result, GError **error) { GSimpleAsyncResult *simple; gssize nread; simple = G_SIMPLE_ASYNC_RESULT (result); g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_real_fill_async); nread = g_simple_async_result_get_op_res_gssize (simple); return nread; } typedef struct { gssize bytes_read; gssize count; void *buffer; } ReadAsyncData; static void free_read_async_data (gpointer _data) { ReadAsyncData *data = _data; g_slice_free (ReadAsyncData, data); } static void large_read_callback (GObject *source_object, GAsyncResult *result, gpointer user_data) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data); ReadAsyncData *data; GError *error; gssize nread; data = g_simple_async_result_get_op_res_gpointer (simple); error = NULL; nread = g_input_stream_read_finish (G_INPUT_STREAM (source_object), result, &error); /* Only report the error if we've not already read some data */ if (nread < 0 && data->bytes_read == 0) g_simple_async_result_set_from_error (simple, error); if (nread > 0) data->bytes_read += nread; if (error) g_error_free (error); /* Complete immediately, not in idle, since we're already in a mainloop callout */ g_simple_async_result_complete (simple); g_object_unref (simple); } static void read_fill_buffer_callback (GObject *source_object, GAsyncResult *result, gpointer user_data) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data); GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; ReadAsyncData *data; GError *error; gssize nread; gsize available; bstream = G_BUFFERED_INPUT_STREAM (source_object); priv = bstream->priv; data = g_simple_async_result_get_op_res_gpointer (simple); error = NULL; nread = g_buffered_input_stream_fill_finish (bstream, result, &error); if (nread < 0 && data->bytes_read == 0) g_simple_async_result_set_from_error (simple, error); if (nread > 0) { available = priv->end - priv->pos; data->count = MIN (data->count, available); memcpy ((char *)data->buffer + data->bytes_read, (char *)priv->buffer + priv->pos, data->count); data->bytes_read += data->count; priv->pos += data->count; } if (error) g_error_free (error); /* Complete immediately, not in idle, since we're already in a mainloop callout */ g_simple_async_result_complete (simple); g_object_unref (simple); } static void g_buffered_input_stream_read_async (GInputStream *stream, void *buffer, gsize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; GBufferedInputStreamClass *class; GInputStream *base_stream; gsize available; GSimpleAsyncResult *simple; ReadAsyncData *data; bstream = G_BUFFERED_INPUT_STREAM (stream); priv = bstream->priv; data = g_slice_new (ReadAsyncData); data->buffer = buffer; data->bytes_read = 0; simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_buffered_input_stream_read_async); g_simple_async_result_set_op_res_gpointer (simple, data, free_read_async_data); available = priv->end - priv->pos; if (count <= available) { memcpy (buffer, priv->buffer + priv->pos, count); priv->pos += count; data->bytes_read = count; g_simple_async_result_complete_in_idle (simple); g_object_unref (simple); return; } /* Full request not available, read all currently availbile and request refill for more */ memcpy (buffer, priv->buffer + priv->pos, available); priv->pos = 0; priv->end = 0; count -= available; data->bytes_read = available; data->count = count; if (count > priv->len) { /* Large request, shortcut buffer */ base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; g_input_stream_read_async (base_stream, (char *)buffer + data->bytes_read, count, io_priority, cancellable, large_read_callback, simple); } else { class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); class->fill_async (bstream, priv->len, io_priority, cancellable, read_fill_buffer_callback, simple); } } static gssize g_buffered_input_stream_read_finish (GInputStream *stream, GAsyncResult *result, GError **error) { GSimpleAsyncResult *simple; ReadAsyncData *data; simple = G_SIMPLE_ASYNC_RESULT (result); g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_read_async); data = g_simple_async_result_get_op_res_gpointer (simple); return data->bytes_read; } typedef struct { gssize bytes_skipped; gssize count; } SkipAsyncData; static void free_skip_async_data (gpointer _data) { SkipAsyncData *data = _data; g_slice_free (SkipAsyncData, data); } static void large_skip_callback (GObject *source_object, GAsyncResult *result, gpointer user_data) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data); SkipAsyncData *data; GError *error; gssize nread; data = g_simple_async_result_get_op_res_gpointer (simple); error = NULL; nread = g_input_stream_skip_finish (G_INPUT_STREAM (source_object), result, &error); /* Only report the error if we've not already read some data */ if (nread < 0 && data->bytes_skipped == 0) g_simple_async_result_set_from_error (simple, error); if (nread > 0) data->bytes_skipped += nread; if (error) g_error_free (error); /* Complete immediately, not in idle, since we're already in a mainloop callout */ g_simple_async_result_complete (simple); g_object_unref (simple); } static void skip_fill_buffer_callback (GObject *source_object, GAsyncResult *result, gpointer user_data) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data); GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; SkipAsyncData *data; GError *error; gssize nread; gsize available; bstream = G_BUFFERED_INPUT_STREAM (source_object); priv = bstream->priv; data = g_simple_async_result_get_op_res_gpointer (simple); error = NULL; nread = g_buffered_input_stream_fill_finish (bstream, result, &error); if (nread < 0 && data->bytes_skipped == 0) g_simple_async_result_set_from_error (simple, error); if (nread > 0) { available = priv->end - priv->pos; data->count = MIN (data->count, available); data->bytes_skipped += data->count; priv->pos += data->count; } if (error) g_error_free (error); /* Complete immediately, not in idle, since we're already in a mainloop callout */ g_simple_async_result_complete (simple); g_object_unref (simple); } static void g_buffered_input_stream_skip_async (GInputStream *stream, gsize count, int io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GBufferedInputStream *bstream; GBufferedInputStreamPrivate *priv; GBufferedInputStreamClass *class; GInputStream *base_stream; gsize available; GSimpleAsyncResult *simple; SkipAsyncData *data; bstream = G_BUFFERED_INPUT_STREAM (stream); priv = bstream->priv; data = g_slice_new (SkipAsyncData); data->bytes_skipped = 0; simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_buffered_input_stream_skip_async); g_simple_async_result_set_op_res_gpointer (simple, data, free_skip_async_data); available = priv->end - priv->pos; if (count <= available) { priv->pos += count; data->bytes_skipped = count; g_simple_async_result_complete_in_idle (simple); g_object_unref (simple); return; } /* Full request not available, skip all currently availbile and request refill for more */ priv->pos = 0; priv->end = 0; count -= available; data->bytes_skipped = available; data->count = count; if (count > priv->len) { /* Large request, shortcut buffer */ base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream; g_input_stream_skip_async (base_stream, count, io_priority, cancellable, large_skip_callback, simple); } else { class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); class->fill_async (bstream, priv->len, io_priority, cancellable, skip_fill_buffer_callback, simple); } } static gssize g_buffered_input_stream_skip_finish (GInputStream *stream, GAsyncResult *result, GError **error) { GSimpleAsyncResult *simple; SkipAsyncData *data; simple = G_SIMPLE_ASYNC_RESULT (result); g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_skip_async); data = g_simple_async_result_get_op_res_gpointer (simple); return data->bytes_skipped; } #define __G_BUFFERED_INPUT_STREAM_C__ #include "gioaliasdef.c"