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glib/gio/gdatainputstream.c
Christian Persch fc5f3a96be Docs fix
2010-06-20 13:35:41 +02:00

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/* 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 <alexl@redhat.com>
*/
#include "config.h"
#include "gdatainputstream.h"
#include "gsimpleasyncresult.h"
#include "gcancellable.h"
#include "gioenumtypes.h"
#include "gioerror.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* 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)
{
GBufferedInputStream *bstream;
const char *buffer;
gsize start, end, peeked;
int i;
gsize available, checked;
const char *stop_char;
bstream = G_BUFFERED_INPUT_STREAM (stream);
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 != '\0'; 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.
*
* 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;
gsize checked;
gssize found_pos;
gssize res;
int stop_char_len;
char *data_until;
g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), NULL);
bstream = G_BUFFERED_INPUT_STREAM (stream);
stop_char_len = 1;
checked = 0;
while ((found_pos = scan_for_chars (stream, &checked, stop_chars)) == -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;
stop_char_len = 0;
break;
}
}
}
data_until = g_malloc (found_pos + stop_char_len + 1);
res = g_input_stream_read (G_INPUT_STREAM (stream),
data_until,
found_pos + stop_char_len,
NULL, NULL);
if (length)
*length = (gsize)found_pos;
g_warn_if_fail (res == found_pos + stop_char_len);
data_until[found_pos] = 0;
return data_until;
}
typedef struct
{
GDataInputStream *stream;
GSimpleAsyncResult *simple;
gboolean last_saw_cr;
gsize checked;
gint io_priority;
GCancellable *cancellable;
gchar *stop_chars;
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);
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,
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;
data->stop_chars = g_strdup (stop_chars);
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 <link linkend="io-priority">I/O priority</link>
* 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, 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 <link linkend="io-priority">I/O priority</link>
* 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.
*
* 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, 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);
}
#define __G_DATA_INPUT_STREAM_C__
#include "gioaliasdef.c"
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