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glib/gio/gdatainputstream.c
Philip Withnall 2ffba0e262 gdatainputstream: Document the returned string is always nul-terminated 
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Reviewed-by: nobody

https://bugzilla.gnome.org/show_bug.cgi?id=742124
2018-02-16 11:15:02 +00:00

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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 2.1 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: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "gdatainputstream.h"
#include "gtask.h"
#include "gcancellable.h"
#include "gioenumtypes.h"
#include "gioerror.h"
#include "glibintl.h"
#include <string.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_WITH_PRIVATE (GDataInputStream,
g_data_input_stream,
G_TYPE_BUFFERED_INPUT_STREAM)
static void
g_data_input_stream_class_init (GDataInputStreamClass *klass)
{
GObjectClass *object_class;
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_data_input_stream_get_instance_private (stream);
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 available.
*
**/
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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (out) (optional): a #gsize to get the length of the data read in.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @error: #GError for error reporting.
*
* Reads a line from the data input stream. Note that no encoding
* checks or conversion is performed; the input is not guaranteed to
* be UTF-8, and may in fact have embedded NUL characters.
*
* 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: (nullable) (transfer full) (array zero-terminated=1) (element-type guint8):
* a NUL terminated byte array 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;
}
/**
* g_data_input_stream_read_line_utf8:
* @stream: a given #GDataInputStream.
* @length: (out) (optional): a #gsize to get the length of the data read in.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @error: #GError for error reporting.
*
* Reads a UTF-8 encoded 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: (nullable) (transfer full): a NUL terminated UTF-8 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. For UTF-8
* conversion errors, the set error domain is %G_CONVERT_ERROR. If
* there's no content to read, it will still return %NULL, but @error
* won't be set.
*
* Since: 2.30
**/
char *
g_data_input_stream_read_line_utf8 (GDataInputStream *stream,
gsize *length,
GCancellable *cancellable,
GError **error)
{
char *res;
res = g_data_input_stream_read_line (stream, length, cancellable, error);
if (!res)
return NULL;
if (!g_utf8_validate (res, -1, NULL))
{
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
g_free (res);
return NULL;
}
return res;
}
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: (out) (optional): a #gsize to get the length of the data read in.
* @cancellable: (nullable): 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: (transfer full): 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.
* Deprecated: 2.56: Use g_data_input_stream_read_upto() instead, which has more
* consistent behaviour regarding the stop character.
*/
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
{
gboolean last_saw_cr;
gsize checked;
gchar *stop_chars;
gssize stop_chars_len;
gsize length;
} GDataInputStreamReadData;
static void
g_data_input_stream_read_complete (GTask *task,
gsize read_length,
gsize skip_length)
{
GDataInputStreamReadData *data = g_task_get_task_data (task);
GInputStream *stream = g_task_get_source_object (task);
char *line = NULL;
if (read_length || skip_length)
{
gssize bytes;
data->length = read_length;
line = g_malloc (read_length + 1);
line[read_length] = '\0';
/* we already checked the buffer. this shouldn't fail. */
bytes = g_input_stream_read (stream, line, read_length, NULL, NULL);
g_assert_cmpint (bytes, ==, read_length);
bytes = g_input_stream_skip (stream, skip_length, NULL, NULL);
g_assert_cmpint (bytes, ==, skip_length);
}
g_task_return_pointer (task, line, g_free);
g_object_unref (task);
}
static void
g_data_input_stream_read_line_ready (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
GDataInputStreamReadData *data = g_task_get_task_data (task);
GBufferedInputStream *buffer = g_task_get_source_object (task);
gssize found_pos;
gint newline_len;
if (result)
/* this is a callback. finish the async call. */
{
GError *error = NULL;
gssize bytes;
bytes = g_buffered_input_stream_fill_finish (buffer, result, &error);
if (bytes <= 0)
{
if (bytes < 0)
/* stream error. */
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
g_data_input_stream_read_complete (task, data->checked, 0);
return;
}
/* only proceed if we got more bytes... */
}
if (data->stop_chars)
{
found_pos = scan_for_chars (G_DATA_INPUT_STREAM (buffer),
&data->checked,
data->stop_chars,
data->stop_chars_len);
newline_len = 0;
}
else
found_pos = scan_for_newline (G_DATA_INPUT_STREAM (buffer), &data->checked,
&data->last_saw_cr, &newline_len);
if (found_pos == -1)
/* didn't find a full line; need to buffer some more bytes */
{
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,
g_task_get_priority (task),
g_task_get_cancellable (task),
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 (task, found_pos, newline_len);
}
}
static void
g_data_input_stream_read_data_free (gpointer user_data)
{
GDataInputStreamReadData *data = user_data;
g_free (data->stop_chars);
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)
{
GDataInputStreamReadData *data;
GTask *task;
data = g_slice_new0 (GDataInputStreamReadData);
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->last_saw_cr = FALSE;
task = g_task_new (stream, cancellable, callback, user_data);
g_task_set_source_tag (task, g_data_input_stream_read_async);
g_task_set_task_data (task, data, g_data_input_stream_read_data_free);
g_task_set_priority (task, io_priority);
g_data_input_stream_read_line_ready (NULL, NULL, task);
}
static gchar *
g_data_input_stream_read_finish (GDataInputStream *stream,
GAsyncResult *result,
gsize *length,
GError **error)
{
GTask *task = G_TASK (result);
gchar *line;
line = g_task_propagate_pointer (task, error);
if (length && line)
{
GDataInputStreamReadData *data = g_task_get_task_data (task);
*length = data->length;
}
return line;
}
/**
* g_data_input_stream_read_line_async:
* @stream: a given #GDataInputStream.
* @io_priority: the [I/O priority][io-priority] of the request
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): callback to call when the request is satisfied.
* @user_data: (closure): 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_until_async:
* @stream: a given #GDataInputStream.
* @stop_chars: characters to terminate the read.
* @io_priority: the [I/O priority][io-priority] of the request
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): callback to call when the request is satisfied.
* @user_data: (closure): 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
* Deprecated: 2.56: Use g_data_input_stream_read_upto_async() instead, which
* has more consistent behaviour regarding the stop character.
*/
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_line_finish:
* @stream: a given #GDataInputStream.
* @result: the #GAsyncResult that was provided to the callback.
* @length: (out) (optional): 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(). Note the warning about
* string encoding in g_data_input_stream_read_line() applies here as
* well.
*
* Returns: (nullable) (transfer full) (array zero-terminated=1) (element-type guint8):
* a NUL-terminated byte array 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_task_is_valid (result, stream), NULL);
return g_data_input_stream_read_finish (stream, result, length, error);
}
/**
* g_data_input_stream_read_line_finish_utf8:
* @stream: a given #GDataInputStream.
* @result: the #GAsyncResult that was provided to the callback.
* @length: (out) (optional): 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: (nullable) (transfer full): 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. For UTF-8 conversion errors, the set
* error domain is %G_CONVERT_ERROR. If there's no content to read,
* it will still return %NULL, but @error won't be set.
*
* Since: 2.30
*/
gchar *
g_data_input_stream_read_line_finish_utf8 (GDataInputStream *stream,
GAsyncResult *result,
gsize *length,
GError **error)
{
gchar *res;
res = g_data_input_stream_read_line_finish (stream, result, length, error);
if (!res)
return NULL;
if (!g_utf8_validate (res, -1, NULL))
{
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
g_free (res);
return NULL;
}
return res;
}
/**
* g_data_input_stream_read_until_finish:
* @stream: a given #GDataInputStream.
* @result: the #GAsyncResult that was provided to the callback.
* @length: (out) (optional): 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: (transfer full): 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.
* Deprecated: 2.56: Use g_data_input_stream_read_upto_finish() instead, which
* has more consistent behaviour regarding the stop character.
*/
gchar *
g_data_input_stream_read_until_finish (GDataInputStream *stream,
GAsyncResult *result,
gsize *length,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, stream), 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: (out) (optional): a #gsize to get the length of the data read in
* @cancellable: (nullable): 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.
*
* The returned string will always be nul-terminated on success.
*
* Returns: (transfer full): 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: 2.26
*/
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
* @io_priority: the [I/O priority][io-priority] of the request
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
* @callback: (scope async): callback to call when the request is satisfied
* @user_data: (closure): 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: 2.26
*/
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_finish:
* @stream: a #GDataInputStream
* @result: the #GAsyncResult that was provided to the callback
* @length: (out) (optional): 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.
*
* The returned string will always be nul-terminated on success.
*
* Returns: (transfer full): 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_task_is_valid (result, stream), NULL);
return g_data_input_stream_read_finish (stream, result, length, error);
}
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