| /* 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, see <http://www.gnu.org/licenses/>. |
| * |
| * Author: Christian Kellner <gicmo@gnome.org> |
| */ |
| |
| #include "config.h" |
| #include "gbufferedinputstream.h" |
| #include "ginputstream.h" |
| #include "gcancellable.h" |
| #include "gasyncresult.h" |
| #include "gtask.h" |
| #include "gseekable.h" |
| #include "gioerror.h" |
| #include <string.h> |
| #include "glibintl.h" |
| |
| |
| /** |
| * SECTION:gbufferedinputstream |
| * @short_description: Buffered Input Stream |
| * @include: gio/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 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 g_buffered_input_stream_seekable_iface_init (GSeekableIface *iface); |
| static goffset g_buffered_input_stream_tell (GSeekable *seekable); |
| static gboolean g_buffered_input_stream_can_seek (GSeekable *seekable); |
| static gboolean g_buffered_input_stream_seek (GSeekable *seekable, |
| goffset offset, |
| GSeekType type, |
| GCancellable *cancellable, |
| GError **error); |
| static gboolean g_buffered_input_stream_can_truncate (GSeekable *seekable); |
| static gboolean g_buffered_input_stream_truncate (GSeekable *seekable, |
| goffset offset, |
| GCancellable *cancellable, |
| GError **error); |
| |
| static void compact_buffer (GBufferedInputStream *stream); |
| |
| G_DEFINE_TYPE_WITH_CODE (GBufferedInputStream, |
| g_buffered_input_stream, |
| G_TYPE_FILTER_INPUT_STREAM, |
| G_ADD_PRIVATE (GBufferedInputStream) |
| G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE, |
| g_buffered_input_stream_seekable_iface_init)) |
| |
| static void |
| g_buffered_input_stream_class_init (GBufferedInputStreamClass *klass) |
| { |
| GObjectClass *object_class; |
| GInputStreamClass *istream_class; |
| GBufferedInputStreamClass *bstream_class; |
| |
| 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; |
| |
| 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: a #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: a #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) |
| { |
| GBufferedInputStream *bstream; |
| |
| bstream = G_BUFFERED_INPUT_STREAM (object); |
| |
| 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); |
| |
| G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize (object); |
| } |
| |
| static void |
| g_buffered_input_stream_seekable_iface_init (GSeekableIface *iface) |
| { |
| iface->tell = g_buffered_input_stream_tell; |
| iface->can_seek = g_buffered_input_stream_can_seek; |
| iface->seek = g_buffered_input_stream_seek; |
| iface->can_truncate = g_buffered_input_stream_can_truncate; |
| iface->truncate_fn = g_buffered_input_stream_truncate; |
| } |
| |
| static void |
| g_buffered_input_stream_init (GBufferedInputStream *stream) |
| { |
| stream->priv = g_buffered_input_stream_get_instance_private (stream); |
| } |
| |
| |
| /** |
| * 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 #GInputStream |
| * @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: a #GBufferedInputStream |
| * @count: the number of bytes that will be read from the stream |
| * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore |
| * @error: location to store the error occurring, 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 @count is -1 then the attempted read size is equal to the number of |
| * bytes that are required to fill 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. |
| * |
| * 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 (count < -1) |
| { |
| g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, |
| _("Too large count value passed to %s"), G_STRFUNC); |
| return -1; |
| } |
| |
| 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: a #GBufferedInputStream |
| * @count: the number of bytes that will be read from the stream |
| * @io_priority: the [I/O priority][io-priority] of the request |
| * @cancellable: (allow-none): optional #GCancellable object |
| * @callback: (scope async): a #GAsyncReadyCallback |
| * @user_data: (closure): 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(). |
| * |
| * If @count is -1 then the attempted read size is equal to the number |
| * of bytes that are required to fill the buffer. |
| */ |
| void |
| g_buffered_input_stream_fill_async (GBufferedInputStream *stream, |
| gssize count, |
| int io_priority, |
| GCancellable *cancellable, |
| GAsyncReadyCallback callback, |
| gpointer user_data) |
| { |
| GBufferedInputStreamClass *class; |
| GError *error = NULL; |
| |
| g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream)); |
| |
| if (count == 0) |
| { |
| GTask *task; |
| |
| task = g_task_new (stream, cancellable, callback, user_data); |
| g_task_set_source_tag (task, g_buffered_input_stream_fill_async); |
| g_task_return_int (task, 0); |
| g_object_unref (task); |
| return; |
| } |
| |
| if (count < -1) |
| { |
| g_task_report_new_error (stream, callback, user_data, |
| g_buffered_input_stream_fill_async, |
| G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, |
| _("Too large count value passed to %s"), |
| G_STRFUNC); |
| return; |
| } |
| |
| if (!g_input_stream_set_pending (G_INPUT_STREAM (stream), &error)) |
| { |
| g_task_report_error (stream, callback, user_data, |
| g_buffered_input_stream_fill_async, |
| 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) |
| { |
| 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_async_result_legacy_propagate_error (result, error)) |
| return -1; |
| else if (g_async_result_is_tagged (result, g_buffered_input_stream_fill_async)) |
| return g_task_propagate_int (G_TASK (result), error); |
| |
| 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: (array length=count) (element-type guint8): 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: (out): 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: (array length=count) (element-type guint8) (transfer none): |
| * 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; |
| |
| 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 available 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; |
| } |
| |
| static goffset |
| g_buffered_input_stream_tell (GSeekable *seekable) |
| { |
| GBufferedInputStream *bstream; |
| GBufferedInputStreamPrivate *priv; |
| GInputStream *base_stream; |
| GSeekable *base_stream_seekable; |
| gsize available; |
| goffset base_offset; |
| |
| bstream = G_BUFFERED_INPUT_STREAM (seekable); |
| priv = bstream->priv; |
| |
| base_stream = G_FILTER_INPUT_STREAM (seekable)->base_stream; |
| if (!G_IS_SEEKABLE (base_stream)) |
| return 0; |
| base_stream_seekable = G_SEEKABLE (base_stream); |
| |
| available = priv->end - priv->pos; |
| base_offset = g_seekable_tell (base_stream_seekable); |
| |
| return base_offset - available; |
| } |
| |
| static gboolean |
| g_buffered_input_stream_can_seek (GSeekable *seekable) |
| { |
| GInputStream *base_stream; |
| |
| base_stream = G_FILTER_INPUT_STREAM (seekable)->base_stream; |
| return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream)); |
| } |
| |
| static gboolean |
| g_buffered_input_stream_seek (GSeekable *seekable, |
| goffset offset, |
| GSeekType type, |
| GCancellable *cancellable, |
| GError **error) |
| { |
| GBufferedInputStream *bstream; |
| GBufferedInputStreamPrivate *priv; |
| GInputStream *base_stream; |
| GSeekable *base_stream_seekable; |
| |
| bstream = G_BUFFERED_INPUT_STREAM (seekable); |
| priv = bstream->priv; |
| |
| base_stream = G_FILTER_INPUT_STREAM (seekable)->base_stream; |
| if (!G_IS_SEEKABLE (base_stream)) |
| { |
| g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, |
| _("Seek not supported on base stream")); |
| return FALSE; |
| } |
| |
| base_stream_seekable = G_SEEKABLE (base_stream); |
| |
| if (type == G_SEEK_CUR) |
| { |
| if (offset <= priv->end - priv->pos && offset >= -priv->pos) |
| { |
| priv->pos += offset; |
| return TRUE; |
| } |
| else |
| { |
| offset -= priv->end - priv->pos; |
| } |
| } |
| |
| if (g_seekable_seek (base_stream_seekable, offset, type, cancellable, error)) |
| { |
| priv->pos = 0; |
| priv->end = 0; |
| return TRUE; |
| } |
| else |
| { |
| return FALSE; |
| } |
| } |
| |
| static gboolean |
| g_buffered_input_stream_can_truncate (GSeekable *seekable) |
| { |
| return FALSE; |
| } |
| |
| static gboolean |
| g_buffered_input_stream_truncate (GSeekable *seekable, |
| goffset offset, |
| GCancellable *cancellable, |
| GError **error) |
| { |
| g_set_error_literal (error, |
| G_IO_ERROR, |
| G_IO_ERROR_NOT_SUPPORTED, |
| _("Cannot truncate GBufferedInputStream")); |
| return FALSE; |
| } |
| |
| /** |
| * g_buffered_input_stream_read_byte: |
| * @stream: a #GBufferedInputStream |
| * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore |
| * @error: location to store the error occurring, 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_literal (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 != 0) |
| { |
| 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; |
| GTask *task = user_data; |
| |
| error = NULL; |
| res = g_input_stream_read_finish (G_INPUT_STREAM (source_object), |
| result, &error); |
| if (res == -1) |
| g_task_return_error (task, error); |
| else |
| { |
| GBufferedInputStream *stream; |
| GBufferedInputStreamPrivate *priv; |
| |
| stream = g_task_get_source_object (task); |
| priv = G_BUFFERED_INPUT_STREAM (stream)->priv; |
| |
| g_assert_cmpint (priv->end + res, <=, priv->len); |
| priv->end += res; |
| |
| g_task_return_int (task, res); |
| } |
| |
| g_object_unref (task); |
| } |
| |
| 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; |
| GTask *task; |
| 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); |
| |
| task = g_task_new (stream, cancellable, callback, user_data); |
| g_task_set_source_tag (task, 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, |
| task); |
| } |
| |
| static gssize |
| g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream, |
| GAsyncResult *result, |
| GError **error) |
| { |
| g_return_val_if_fail (g_task_is_valid (result, stream), -1); |
| |
| return g_task_propagate_int (G_TASK (result), error); |
| } |
| |
| 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) |
| { |
| GTask *task = G_TASK (user_data); |
| SkipAsyncData *data; |
| GError *error; |
| gssize nread; |
| |
| data = g_task_get_task_data (task); |
| |
| 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_task_return_error (task, error); |
| else |
| { |
| if (error) |
| g_error_free (error); |
| |
| if (nread > 0) |
| data->bytes_skipped += nread; |
| |
| g_task_return_int (task, data->bytes_skipped); |
| } |
| |
| g_object_unref (task); |
| } |
| |
| static void |
| skip_fill_buffer_callback (GObject *source_object, |
| GAsyncResult *result, |
| gpointer user_data) |
| { |
| GTask *task = G_TASK (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_task_get_task_data (task); |
| |
| error = NULL; |
| nread = g_buffered_input_stream_fill_finish (bstream, |
| result, &error); |
| |
| if (nread < 0 && data->bytes_skipped == 0) |
| g_task_return_error (task, error); |
| else |
| { |
| if (error) |
| g_error_free (error); |
| |
| if (nread > 0) |
| { |
| available = priv->end - priv->pos; |
| data->count = MIN (data->count, available); |
| |
| data->bytes_skipped += data->count; |
| priv->pos += data->count; |
| } |
| |
| g_task_return_int (task, data->bytes_skipped); |
| } |
| |
| g_object_unref (task); |
| } |
| |
| 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; |
| GTask *task; |
| SkipAsyncData *data; |
| |
| bstream = G_BUFFERED_INPUT_STREAM (stream); |
| priv = bstream->priv; |
| |
| data = g_slice_new (SkipAsyncData); |
| data->bytes_skipped = 0; |
| task = g_task_new (stream, cancellable, callback, user_data); |
| g_task_set_source_tag (task, g_buffered_input_stream_skip_async); |
| g_task_set_task_data (task, data, free_skip_async_data); |
| |
| available = priv->end - priv->pos; |
| |
| if (count <= available) |
| { |
| priv->pos += count; |
| |
| g_task_return_int (task, count); |
| g_object_unref (task); |
| return; |
| } |
| |
| /* Full request not available, skip all currently available |
| * 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, |
| task); |
| } |
| else |
| { |
| class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream); |
| class->fill_async (bstream, priv->len, io_priority, cancellable, |
| skip_fill_buffer_callback, task); |
| } |
| } |
| |
| static gssize |
| g_buffered_input_stream_skip_finish (GInputStream *stream, |
| GAsyncResult *result, |
| GError **error) |
| { |
| g_return_val_if_fail (g_task_is_valid (result, stream), -1); |
| |
| return g_task_propagate_int (G_TASK (result), error); |
| } |
