/* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2006-2007 Red Hat, Inc. * Copyright (C) 2007 Jürg Billeter * Copyright © 2009 Codethink Limited * * 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: Alexander Larsson */ #include "config.h" #include "gdatainputstream.h" #include "gsimpleasyncresult.h" #include "gcancellable.h" #include "gioenumtypes.h" #include "gioerror.h" #include "glibintl.h" #include /** * SECTION:gdatainputstream * @short_description: Data Input Stream * @include: gio/gio.h * @see_also: #GInputStream * * Data input stream implements #GInputStream and includes functions for * reading structured data directly from a binary input stream. * **/ struct _GDataInputStreamPrivate { GDataStreamByteOrder byte_order; GDataStreamNewlineType newline_type; }; enum { PROP_0, PROP_BYTE_ORDER, PROP_NEWLINE_TYPE }; static void g_data_input_stream_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void g_data_input_stream_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); G_DEFINE_TYPE (GDataInputStream, g_data_input_stream, G_TYPE_BUFFERED_INPUT_STREAM) static void g_data_input_stream_class_init (GDataInputStreamClass *klass) { GObjectClass *object_class; g_type_class_add_private (klass, sizeof (GDataInputStreamPrivate)); object_class = G_OBJECT_CLASS (klass); object_class->get_property = g_data_input_stream_get_property; object_class->set_property = g_data_input_stream_set_property; /** * GDataStream:byte-order: * * The ::byte-order property determines the byte ordering that * is used when reading multi-byte entities (such as integers) * from the stream. */ g_object_class_install_property (object_class, PROP_BYTE_ORDER, g_param_spec_enum ("byte-order", P_("Byte order"), P_("The byte order"), G_TYPE_DATA_STREAM_BYTE_ORDER, G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN, G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB)); /** * GDataStream:newline-type: * * The :newline-type property determines what is considered * as a line ending when reading complete lines from the stream. */ g_object_class_install_property (object_class, PROP_NEWLINE_TYPE, g_param_spec_enum ("newline-type", P_("Newline type"), P_("The accepted types of line ending"), G_TYPE_DATA_STREAM_NEWLINE_TYPE, G_DATA_STREAM_NEWLINE_TYPE_LF, G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB)); } static void g_data_input_stream_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GDataInputStream *dstream; dstream = G_DATA_INPUT_STREAM (object); switch (prop_id) { case PROP_BYTE_ORDER: g_data_input_stream_set_byte_order (dstream, g_value_get_enum (value)); break; case PROP_NEWLINE_TYPE: g_data_input_stream_set_newline_type (dstream, g_value_get_enum (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_data_input_stream_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GDataInputStreamPrivate *priv; GDataInputStream *dstream; dstream = G_DATA_INPUT_STREAM (object); priv = dstream->priv; switch (prop_id) { case PROP_BYTE_ORDER: g_value_set_enum (value, priv->byte_order); break; case PROP_NEWLINE_TYPE: g_value_set_enum (value, priv->newline_type); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_data_input_stream_init (GDataInputStream *stream) { stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream, G_TYPE_DATA_INPUT_STREAM, GDataInputStreamPrivate); stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN; stream->priv->newline_type = G_DATA_STREAM_NEWLINE_TYPE_LF; } /** * g_data_input_stream_new: * @base_stream: a #GInputStream. * * Creates a new data input stream for the @base_stream. * * Returns: a new #GDataInputStream. **/ GDataInputStream * g_data_input_stream_new (GInputStream *base_stream) { GDataInputStream *stream; g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL); stream = g_object_new (G_TYPE_DATA_INPUT_STREAM, "base-stream", base_stream, NULL); return stream; } /** * g_data_input_stream_set_byte_order: * @stream: a given #GDataInputStream. * @order: a #GDataStreamByteOrder to set. * * This function sets the byte order for the given @stream. All subsequent * reads from the @stream will be read in the given @order. * **/ void g_data_input_stream_set_byte_order (GDataInputStream *stream, GDataStreamByteOrder order) { GDataInputStreamPrivate *priv; g_return_if_fail (G_IS_DATA_INPUT_STREAM (stream)); priv = stream->priv; if (priv->byte_order != order) { priv->byte_order = order; g_object_notify (G_OBJECT (stream), "byte-order"); } } /** * g_data_input_stream_get_byte_order: * @stream: a given #GDataInputStream. * * Gets the byte order for the data input stream. * * Returns: the @stream's current #GDataStreamByteOrder. **/ GDataStreamByteOrder g_data_input_stream_get_byte_order (GDataInputStream *stream) { g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN); return stream->priv->byte_order; } /** * g_data_input_stream_set_newline_type: * @stream: a #GDataInputStream. * @type: the type of new line return as #GDataStreamNewlineType. * * Sets the newline type for the @stream. * * Note that using G_DATA_STREAM_NEWLINE_TYPE_ANY is slightly unsafe. If a read * chunk ends in "CR" we must read an additional byte to know if this is "CR" or * "CR LF", and this might block if there is no more data availible. * **/ void g_data_input_stream_set_newline_type (GDataInputStream *stream, GDataStreamNewlineType type) { GDataInputStreamPrivate *priv; g_return_if_fail (G_IS_DATA_INPUT_STREAM (stream)); priv = stream->priv; if (priv->newline_type != type) { priv->newline_type = type; g_object_notify (G_OBJECT (stream), "newline-type"); } } /** * g_data_input_stream_get_newline_type: * @stream: a given #GDataInputStream. * * Gets the current newline type for the @stream. * * Returns: #GDataStreamNewlineType for the given @stream. **/ GDataStreamNewlineType g_data_input_stream_get_newline_type (GDataInputStream *stream) { g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), G_DATA_STREAM_NEWLINE_TYPE_ANY); return stream->priv->newline_type; } static gboolean read_data (GDataInputStream *stream, void *buffer, gsize size, GCancellable *cancellable, GError **error) { gsize available; gssize res; while ((available = g_buffered_input_stream_get_available (G_BUFFERED_INPUT_STREAM (stream))) < size) { res = g_buffered_input_stream_fill (G_BUFFERED_INPUT_STREAM (stream), size - available, cancellable, error); if (res < 0) return FALSE; if (res == 0) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Unexpected early end-of-stream")); return FALSE; } } /* This should always succeed, since it's in the buffer */ res = g_input_stream_read (G_INPUT_STREAM (stream), buffer, size, NULL, NULL); g_warn_if_fail (res == size); return TRUE; } /** * g_data_input_stream_read_byte: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads an unsigned 8-bit/1-byte value from @stream. * * Returns: an unsigned 8-bit/1-byte value read from the @stream or %0 * if an error occurred. **/ guchar g_data_input_stream_read_byte (GDataInputStream *stream, GCancellable *cancellable, GError **error) { guchar c; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), '\0'); if (read_data (stream, &c, 1, cancellable, error)) return c; return 0; } /** * g_data_input_stream_read_int16: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads a 16-bit/2-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order() and g_data_input_stream_set_byte_order(). * * Returns: a signed 16-bit/2-byte value read from @stream or %0 if * an error occurred. **/ gint16 g_data_input_stream_read_int16 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { gint16 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 2, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GINT16_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GINT16_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } /** * g_data_input_stream_read_uint16: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads an unsigned 16-bit/2-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order() and g_data_input_stream_set_byte_order(). * * Returns: an unsigned 16-bit/2-byte value read from the @stream or %0 if * an error occurred. **/ guint16 g_data_input_stream_read_uint16 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { guint16 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 2, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GUINT16_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GUINT16_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } /** * g_data_input_stream_read_int32: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads a signed 32-bit/4-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order() and g_data_input_stream_set_byte_order(). * * 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. * * Returns: a signed 32-bit/4-byte value read from the @stream or %0 if * an error occurred. **/ gint32 g_data_input_stream_read_int32 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { gint32 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 4, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GINT32_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GINT32_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } /** * g_data_input_stream_read_uint32: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads an unsigned 32-bit/4-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order() and g_data_input_stream_set_byte_order(). * * 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. * * Returns: an unsigned 32-bit/4-byte value read from the @stream or %0 if * an error occurred. **/ guint32 g_data_input_stream_read_uint32 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { guint32 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 4, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GUINT32_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GUINT32_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } /** * g_data_input_stream_read_int64: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads a 64-bit/8-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order() and g_data_input_stream_set_byte_order(). * * 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. * * Returns: a signed 64-bit/8-byte value read from @stream or %0 if * an error occurred. **/ gint64 g_data_input_stream_read_int64 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { gint64 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 8, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GINT64_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GINT64_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } /** * g_data_input_stream_read_uint64: * @stream: a given #GDataInputStream. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads an unsigned 64-bit/8-byte value from @stream. * * In order to get the correct byte order for this read operation, * see g_data_input_stream_get_byte_order(). * * 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. * * Returns: an unsigned 64-bit/8-byte read from @stream or %0 if * an error occurred. **/ guint64 g_data_input_stream_read_uint64 (GDataInputStream *stream, GCancellable *cancellable, GError **error) { guint64 v; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), 0); if (read_data (stream, &v, 8, cancellable, error)) { switch (stream->priv->byte_order) { case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN: v = GUINT64_FROM_BE (v); break; case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN: v = GUINT64_FROM_LE (v); break; case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN: default: break; } return v; } return 0; } static gssize scan_for_newline (GDataInputStream *stream, gsize *checked_out, gboolean *last_saw_cr_out, int *newline_len_out) { GBufferedInputStream *bstream; GDataInputStreamPrivate *priv; const char *buffer; gsize start, end, peeked; int i; gssize found_pos; int newline_len; gsize available, checked; gboolean last_saw_cr; priv = stream->priv; bstream = G_BUFFERED_INPUT_STREAM (stream); checked = *checked_out; last_saw_cr = *last_saw_cr_out; found_pos = -1; newline_len = 0; start = checked; buffer = (const char*)g_buffered_input_stream_peek_buffer (bstream, &available) + start; end = available; peeked = end - start; for (i = 0; checked < available && i < peeked; i++) { switch (priv->newline_type) { case G_DATA_STREAM_NEWLINE_TYPE_LF: if (buffer[i] == 10) { found_pos = start + i; newline_len = 1; } break; case G_DATA_STREAM_NEWLINE_TYPE_CR: if (buffer[i] == 13) { found_pos = start + i; newline_len = 1; } break; case G_DATA_STREAM_NEWLINE_TYPE_CR_LF: if (last_saw_cr && buffer[i] == 10) { found_pos = start + i - 1; newline_len = 2; } break; default: case G_DATA_STREAM_NEWLINE_TYPE_ANY: if (buffer[i] == 10) /* LF */ { if (last_saw_cr) { /* CR LF */ found_pos = start + i - 1; newline_len = 2; } else { /* LF */ found_pos = start + i; newline_len = 1; } } else if (last_saw_cr) { /* Last was cr, this is not LF, end is CR */ found_pos = start + i - 1; newline_len = 1; } /* Don't check for CR here, instead look at last_saw_cr on next byte */ break; } last_saw_cr = (buffer[i] == 13); if (found_pos != -1) { *newline_len_out = newline_len; return found_pos; } } checked = end; *checked_out = checked; *last_saw_cr_out = last_saw_cr; return -1; } /** * g_data_input_stream_read_line: * @stream: a given #GDataInputStream. * @length: a #gsize to get the length of the data read in. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads a line from the data input stream. * * 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. * * Returns: a string with the line that was read in (without the newlines). * Set @length to a #gsize to get the length of the read line. * On an error, it will return %NULL and @error will be set. If there's no * content to read, it will still return %NULL, but @error won't be set. **/ char * g_data_input_stream_read_line (GDataInputStream *stream, gsize *length, GCancellable *cancellable, GError **error) { GBufferedInputStream *bstream; gsize checked; gboolean last_saw_cr; gssize found_pos; gssize res; int newline_len; char *line; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), NULL); bstream = G_BUFFERED_INPUT_STREAM (stream); newline_len = 0; checked = 0; last_saw_cr = FALSE; while ((found_pos = scan_for_newline (stream, &checked, &last_saw_cr, &newline_len)) == -1) { if (g_buffered_input_stream_get_available (bstream) == g_buffered_input_stream_get_buffer_size (bstream)) g_buffered_input_stream_set_buffer_size (bstream, 2 * g_buffered_input_stream_get_buffer_size (bstream)); res = g_buffered_input_stream_fill (bstream, -1, cancellable, error); if (res < 0) return NULL; if (res == 0) { /* End of stream */ if (g_buffered_input_stream_get_available (bstream) == 0) { if (length) *length = 0; return NULL; } else { found_pos = checked; newline_len = 0; break; } } } line = g_malloc (found_pos + newline_len + 1); res = g_input_stream_read (G_INPUT_STREAM (stream), line, found_pos + newline_len, NULL, NULL); if (length) *length = (gsize)found_pos; g_warn_if_fail (res == found_pos + newline_len); line[found_pos] = 0; return line; } static gssize scan_for_chars (GDataInputStream *stream, gsize *checked_out, const char *stop_chars, gssize stop_chars_len) { GBufferedInputStream *bstream; const char *buffer; gsize start, end, peeked; int i; gsize available, checked; const char *stop_char; const char *stop_end; bstream = G_BUFFERED_INPUT_STREAM (stream); stop_end = stop_chars + stop_chars_len; checked = *checked_out; start = checked; buffer = (const char *)g_buffered_input_stream_peek_buffer (bstream, &available) + start; end = available; peeked = end - start; for (i = 0; checked < available && i < peeked; i++) { for (stop_char = stop_chars; stop_char != stop_end; stop_char++) { if (buffer[i] == *stop_char) return (start + i); } } checked = end; *checked_out = checked; return -1; } /** * g_data_input_stream_read_until: * @stream: a given #GDataInputStream. * @stop_chars: characters to terminate the read. * @length: a #gsize to get the length of the data read in. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: #GError for error reporting. * * Reads a string from the data input stream, up to the first * occurrence of any of the stop characters. * * Note that, in contrast to g_data_input_stream_read_until_async(), * this function consumes the stop character that it finds. * * Don't use this function in new code. Its functionality is * inconsistent with g_data_input_stream_read_until_async(). Both * functions will be marked as deprecated in a future release. Use * g_data_input_stream_read_upto() instead, but note that that function * does not consume the stop character. * * Returns: a string with the data that was read before encountering * any of the stop characters. Set @length to a #gsize to get the length * of the string. This function will return %NULL on an error. */ char * g_data_input_stream_read_until (GDataInputStream *stream, const gchar *stop_chars, gsize *length, GCancellable *cancellable, GError **error) { GBufferedInputStream *bstream; gchar *result; bstream = G_BUFFERED_INPUT_STREAM (stream); result = g_data_input_stream_read_upto (stream, stop_chars, -1, length, cancellable, error); /* If we're not at end of stream then we have a stop_char to consume. */ if (result != NULL && g_buffered_input_stream_get_available (bstream) > 0) { gsize res; gchar b; res = g_input_stream_read (G_INPUT_STREAM (stream), &b, 1, NULL, NULL); g_assert (res == 1); } return result; } typedef struct { GDataInputStream *stream; GSimpleAsyncResult *simple; gboolean last_saw_cr; gsize checked; gint io_priority; GCancellable *cancellable; gchar *stop_chars; gssize stop_chars_len; gchar *line; gsize length; } GDataInputStreamReadData; static void g_data_input_stream_read_complete (GDataInputStreamReadData *data, gsize read_length, gsize skip_length, gboolean need_idle_dispatch) { if (read_length || skip_length) { gssize bytes; data->length = read_length; data->line = g_malloc (read_length + 1); data->line[read_length] = '\0'; /* we already checked the buffer. this shouldn't fail. */ bytes = g_input_stream_read (G_INPUT_STREAM (data->stream), data->line, read_length, NULL, NULL); g_assert_cmpint (bytes, ==, read_length); bytes = g_input_stream_skip (G_INPUT_STREAM (data->stream), skip_length, NULL, NULL); g_assert_cmpint (bytes, ==, skip_length); } if (need_idle_dispatch) g_simple_async_result_complete_in_idle (data->simple); else g_simple_async_result_complete (data->simple); g_object_unref (data->simple); } static void g_data_input_stream_read_line_ready (GObject *object, GAsyncResult *result, gpointer user_data) { GDataInputStreamReadData *data = user_data; gssize found_pos; gint newline_len; if (result) /* this is a callback. finish the async call. */ { GBufferedInputStream *buffer = G_BUFFERED_INPUT_STREAM (data->stream); GError *error = NULL; gssize bytes; bytes = g_buffered_input_stream_fill_finish (buffer, result, &error); if (bytes <= 0) { if (bytes < 0) /* stream error. */ { g_simple_async_result_set_from_error (data->simple, error); g_error_free (error); data->checked = 0; } g_data_input_stream_read_complete (data, data->checked, 0, FALSE); return; } /* only proceed if we got more bytes... */ } if (data->stop_chars) { found_pos = scan_for_chars (data->stream, &data->checked, data->stop_chars, data->stop_chars_len); newline_len = 0; } else found_pos = scan_for_newline (data->stream, &data->checked, &data->last_saw_cr, &newline_len); if (found_pos == -1) /* didn't find a full line; need to buffer some more bytes */ { GBufferedInputStream *buffer = G_BUFFERED_INPUT_STREAM (data->stream); gsize size; size = g_buffered_input_stream_get_buffer_size (buffer); if (g_buffered_input_stream_get_available (buffer) == size) /* need to grow the buffer */ g_buffered_input_stream_set_buffer_size (buffer, size * 2); /* try again */ g_buffered_input_stream_fill_async (buffer, -1, data->io_priority, data->cancellable, g_data_input_stream_read_line_ready, user_data); } else { /* read the line and the EOL. no error is possible. */ g_data_input_stream_read_complete (data, found_pos, newline_len, result == NULL); } } static void g_data_input_stream_read_data_free (gpointer user_data) { GDataInputStreamReadData *data = user_data; /* we don't hold a ref to ->simple because it keeps a ref to us. * we are called because it is being finalized. */ g_free (data->stop_chars); if (data->cancellable) g_object_unref (data->cancellable); g_free (data->line); g_slice_free (GDataInputStreamReadData, data); } static void g_data_input_stream_read_async (GDataInputStream *stream, const gchar *stop_chars, gssize stop_chars_len, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data, gpointer source_tag) { GDataInputStreamReadData *data; data = g_slice_new (GDataInputStreamReadData); data->stream = stream; if (cancellable) g_object_ref (cancellable); data->cancellable = cancellable; if (stop_chars_len == -1) stop_chars_len = strlen (stop_chars); data->stop_chars = g_memdup (stop_chars, stop_chars_len); data->stop_chars_len = stop_chars_len; data->io_priority = io_priority; data->last_saw_cr = FALSE; data->checked = 0; data->line = NULL; data->simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, source_tag); g_simple_async_result_set_op_res_gpointer (data->simple, data, g_data_input_stream_read_data_free); g_data_input_stream_read_line_ready (NULL, NULL, data); } static gchar * g_data_input_stream_read_finish (GDataInputStream *stream, GAsyncResult *result, gsize *length, GError **error) { GDataInputStreamReadData *data; GSimpleAsyncResult *simple; gchar *line; simple = G_SIMPLE_ASYNC_RESULT (result); if (g_simple_async_result_propagate_error (simple, error)) return NULL; data = g_simple_async_result_get_op_res_gpointer (simple); line = data->line; data->line = NULL; if (length && line) *length = data->length; return line; } /** * g_data_input_stream_read_line_async: * @stream: a given #GDataInputStream. * @io_priority: the I/O priority * of the request. * @cancellable: optional #GCancellable object, %NULL to ignore. * @callback: callback to call when the request is satisfied. * @user_data: the data to pass to callback function. * * The asynchronous version of g_data_input_stream_read_line(). It is * an error to have two outstanding calls to this function. * * When the operation is finished, @callback will be called. You * can then call g_data_input_stream_read_line_finish() to get * the result of the operation. * * Since: 2.20 */ void g_data_input_stream_read_line_async (GDataInputStream *stream, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { g_return_if_fail (G_IS_DATA_INPUT_STREAM (stream)); g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable)); g_data_input_stream_read_async (stream, NULL, 0, io_priority, cancellable, callback, user_data, g_data_input_stream_read_line_async); } /** * g_data_input_stream_read_until_async: * @stream: a given #GDataInputStream. * @stop_chars: characters to terminate the read. * @io_priority: the I/O priority * of the request. * @cancellable: optional #GCancellable object, %NULL to ignore. * @callback: callback to call when the request is satisfied. * @user_data: the data to pass to callback function. * * The asynchronous version of g_data_input_stream_read_until(). * It is an error to have two outstanding calls to this function. * * Note that, in contrast to g_data_input_stream_read_until(), * this function does not consume the stop character that it finds. You * must read it for yourself. * * When the operation is finished, @callback will be called. You * can then call g_data_input_stream_read_until_finish() to get * the result of the operation. * * Don't use this function in new code. Its functionality is * inconsistent with g_data_input_stream_read_until(). Both functions * will be marked as deprecated in a future release. Use * g_data_input_stream_read_upto_async() instead. * * Since: 2.20 */ void g_data_input_stream_read_until_async (GDataInputStream *stream, const gchar *stop_chars, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { g_return_if_fail (G_IS_DATA_INPUT_STREAM (stream)); g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable)); g_return_if_fail (stop_chars != NULL); g_data_input_stream_read_async (stream, stop_chars, -1, io_priority, cancellable, callback, user_data, g_data_input_stream_read_until_async); } /** * g_data_input_stream_read_line_finish: * @stream: a given #GDataInputStream. * @result: the #GAsyncResult that was provided to the callback. * @length: a #gsize to get the length of the data read in. * @error: #GError for error reporting. * * Finish an asynchronous call started by * g_data_input_stream_read_line_async(). * * Returns: a string with the line that was read in (without the newlines). * Set @length to a #gsize to get the length of the read line. * On an error, it will return %NULL and @error will be set. If there's no * content to read, it will still return %NULL, but @error won't be set. * * Since: 2.20 */ gchar * g_data_input_stream_read_line_finish (GDataInputStream *stream, GAsyncResult *result, gsize *length, GError **error) { g_return_val_if_fail ( g_simple_async_result_is_valid (result, G_OBJECT (stream), g_data_input_stream_read_line_async), NULL); return g_data_input_stream_read_finish (stream, result, length, error); } /** * g_data_input_stream_read_until_finish: * @stream: a given #GDataInputStream. * @result: the #GAsyncResult that was provided to the callback. * @length: a #gsize to get the length of the data read in. * @error: #GError for error reporting. * * Finish an asynchronous call started by * g_data_input_stream_read_until_async(). * * Since: 2.20 * * Returns: a string with the data that was read before encountering * any of the stop characters. Set @length to a #gsize to get the length * of the string. This function will return %NULL on an error. */ gchar * g_data_input_stream_read_until_finish (GDataInputStream *stream, GAsyncResult *result, gsize *length, GError **error) { g_return_val_if_fail ( g_simple_async_result_is_valid (result, G_OBJECT (stream), g_data_input_stream_read_until_async), NULL); return g_data_input_stream_read_finish (stream, result, length, error); } /** * g_data_input_stream_read_upto: * @stream: a #GDataInputStream * @stop_chars: characters to terminate the read * @stop_chars_len: length of @stop_chars. May be -1 if @stop_chars is * nul-terminated * @length: a #gsize to get the length of the data read in * @cancellable: optional #GCancellable object, %NULL to ignore * @error: #GError for error reporting * * Reads a string from the data input stream, up to the first * occurrence of any of the stop characters. * * In contrast to g_data_input_stream_read_until(), this function * does not consume the stop character. You have * to use g_data_input_stream_read_byte() to get it before calling * g_data_input_stream_read_upto() again. * * Note that @stop_chars may contain '\0' if @stop_chars_len is * specified. * * Returns: a string with the data that was read before encountering * any of the stop characters. Set @length to a #gsize to get the length * of the string. This function will return %NULL on an error * * Since: 2.24 */ char * g_data_input_stream_read_upto (GDataInputStream *stream, const gchar *stop_chars, gssize stop_chars_len, gsize *length, GCancellable *cancellable, GError **error) { GBufferedInputStream *bstream; gsize checked; gssize found_pos; gssize res; char *data_until; g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), NULL); if (stop_chars_len < 0) stop_chars_len = strlen (stop_chars); bstream = G_BUFFERED_INPUT_STREAM (stream); checked = 0; while ((found_pos = scan_for_chars (stream, &checked, stop_chars, stop_chars_len)) == -1) { if (g_buffered_input_stream_get_available (bstream) == g_buffered_input_stream_get_buffer_size (bstream)) g_buffered_input_stream_set_buffer_size (bstream, 2 * g_buffered_input_stream_get_buffer_size (bstream)); res = g_buffered_input_stream_fill (bstream, -1, cancellable, error); if (res < 0) return NULL; if (res == 0) { /* End of stream */ if (g_buffered_input_stream_get_available (bstream) == 0) { if (length) *length = 0; return NULL; } else { found_pos = checked; break; } } } data_until = g_malloc (found_pos + 1); res = g_input_stream_read (G_INPUT_STREAM (stream), data_until, found_pos, NULL, NULL); if (length) *length = (gsize)found_pos; g_warn_if_fail (res == found_pos); data_until[found_pos] = 0; return data_until; } /** * g_data_input_stream_read_upto_async: * @stream: a #GDataInputStream * @stop_chars: characters to terminate the read * @stop_chars_len: length of @stop_chars. May be -1 if @stop_chars is * nul-terminated * @cancellable: optional #GCancellable object, %NULL to ignore * @callback: callback to call when the request is satisfied * @user_data: the data to pass to callback function * * The asynchronous version of g_data_input_stream_read_upto(). * It is an error to have two outstanding calls to this function. * * In contrast to g_data_input_stream_read_until(), this function * does not consume the stop character. You have * to use g_data_input_stream_read_byte() to get it before calling * g_data_input_stream_read_upto() again. * * Note that @stop_chars may contain '\0' if @stop_chars_len is * specified. * * When the operation is finished, @callback will be called. You * can then call g_data_input_stream_read_upto_finish() to get * the result of the operation. * * Since: 2.24 */ void g_data_input_stream_read_upto_async (GDataInputStream *stream, const gchar *stop_chars, gssize stop_chars_len, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { g_return_if_fail (G_IS_DATA_INPUT_STREAM (stream)); g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable)); g_return_if_fail (stop_chars != NULL); g_data_input_stream_read_async (stream, stop_chars, stop_chars_len, io_priority, cancellable, callback, user_data, g_data_input_stream_read_upto_async); } /** * g_data_input_stream_read_upto_finish: * @stream: a #GDataInputStream * @result: the #GAsyncResult that was provided to the callback * @length: a #gsize to get the length of the data read in * @error: #GError for error reporting * * Finish an asynchronous call started by * g_data_input_stream_read_upto_async(). * * Note that this function does not consume the * stop character. You have to use g_data_input_stream_read_byte() to * get it before calling g_data_input_stream_read_upto_async() again. * * Returns: a string with the data that was read before encountering * any of the stop characters. Set @length to a #gsize to get the length * of the string. This function will return %NULL on an error. * * Since: 2.24 */ gchar * g_data_input_stream_read_upto_finish (GDataInputStream *stream, GAsyncResult *result, gsize *length, GError **error) { g_return_val_if_fail ( g_simple_async_result_is_valid (result, G_OBJECT (stream), g_data_input_stream_read_upto_async), NULL); return g_data_input_stream_read_finish (stream, result, length, error); }