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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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86d7a597f0
Adds API to get or peek a sub-reader of a certain size from a given byte reader. This is useful when parsing nested chunks, one can easily get a byte reader for a sub-chunk and make sure one never reads beyond the sub-chunk boundary. API: gst_byte_reader_peek_sub_reader() API: gst_byte_reader_get_sub_reader()
1255 lines
36 KiB
C
1255 lines
36 KiB
C
/* GStreamer byte reader
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*
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* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
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* Copyright (C) 2009,2014 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define GST_BYTE_READER_DISABLE_INLINES
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#include "gstbytereader.h"
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#include <string.h>
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/**
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* SECTION:gstbytereader
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* @short_description: Reads different integer, string and floating point
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* types from a memory buffer
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*
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* #GstByteReader provides a byte reader that can read different integer and
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* floating point types from a memory buffer. It provides functions for reading
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* signed/unsigned, little/big endian integers of 8, 16, 24, 32 and 64 bits
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* and functions for reading little/big endian floating points numbers of
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* 32 and 64 bits. It also provides functions to read NUL-terminated strings
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* in various character encodings.
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*/
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/**
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* gst_byte_reader_new:
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* @data: (in) (transfer none) (array length=size): data from which the
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* #GstByteReader should read
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* @size: Size of @data in bytes
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*
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* Create a new #GstByteReader instance, which will read from @data.
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*
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* Free-function: gst_byte_reader_free
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*
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* Returns: (transfer full): a new #GstByteReader instance
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*/
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GstByteReader *
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gst_byte_reader_new (const guint8 * data, guint size)
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{
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GstByteReader *ret = g_slice_new0 (GstByteReader);
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ret->data = data;
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ret->size = size;
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return ret;
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}
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/**
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* gst_byte_reader_free:
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* @reader: (in) (transfer full): a #GstByteReader instance
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*
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* Frees a #GstByteReader instance, which was previously allocated by
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* gst_byte_reader_new().
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*/
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void
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gst_byte_reader_free (GstByteReader * reader)
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{
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g_return_if_fail (reader != NULL);
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g_slice_free (GstByteReader, reader);
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}
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/**
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* gst_byte_reader_init:
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* @reader: a #GstByteReader instance
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* @data: (in) (transfer none) (array length=size): data from which
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* the #GstByteReader should read
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* @size: Size of @data in bytes
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*
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* Initializes a #GstByteReader instance to read from @data. This function
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* can be called on already initialized instances.
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*/
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void
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gst_byte_reader_init (GstByteReader * reader, const guint8 * data, guint size)
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{
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g_return_if_fail (reader != NULL);
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reader->data = data;
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reader->size = size;
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reader->byte = 0;
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}
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/**
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* gst_byte_reader_peek_sub_reader: (skip)
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* @reader: an existing and initialized #GstByteReader instance
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* @sub_reader: a #GstByteReader instance to initialize as sub-reader
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* @size: size of @sub_reader in bytes
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*
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* Initializes a #GstByteReader sub-reader instance to contain @size bytes of
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* data from the current position of @reader. This is useful to read chunked
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* formats and make sure that one doesn't read beyond the size of the sub-chunk.
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*
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* Unlike gst_byte_reader_get_sub_reader(), this function does not modify the
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* current position of @reader.
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*
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* Returns: FALSE on error or if @reader does not contain @size more bytes from
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* the current position, and otherwise TRUE
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*
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* Since: 1.6
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*/
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gboolean
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gst_byte_reader_peek_sub_reader (GstByteReader * reader,
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GstByteReader * sub_reader, guint size)
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{
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return _gst_byte_reader_peek_sub_reader_inline (reader, sub_reader, size);
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}
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/**
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* gst_byte_reader_get_sub_reader: (skip)
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* @reader: an existing and initialized #GstByteReader instance
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* @sub_reader: a #GstByteReader instance to initialize as sub-reader
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* @size: size of @sub_reader in bytes
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*
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* Initializes a #GstByteReader sub-reader instance to contain @size bytes of
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* data from the current position of @reader. This is useful to read chunked
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* formats and make sure that one doesn't read beyond the size of the sub-chunk.
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*
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* Unlike gst_byte_reader_peek_sub_reader(), this function also modifies the
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* position of @reader and moves it forward by @size bytes.
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*
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* Returns: FALSE on error or if @reader does not contain @size more bytes from
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* the current position, and otherwise TRUE
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*
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* Since: 1.6
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*/
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gboolean
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gst_byte_reader_get_sub_reader (GstByteReader * reader,
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GstByteReader * sub_reader, guint size)
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{
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return _gst_byte_reader_get_sub_reader_inline (reader, sub_reader, size);
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}
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/**
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* gst_byte_reader_set_pos:
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* @reader: a #GstByteReader instance
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* @pos: The new position in bytes
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*
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* Sets the new position of a #GstByteReader instance to @pos in bytes.
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*
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* Returns: %TRUE if the position could be set successfully, %FALSE
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* otherwise.
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*/
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gboolean
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gst_byte_reader_set_pos (GstByteReader * reader, guint pos)
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{
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g_return_val_if_fail (reader != NULL, FALSE);
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if (pos > reader->size)
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return FALSE;
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reader->byte = pos;
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return TRUE;
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}
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/**
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* gst_byte_reader_get_pos:
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* @reader: a #GstByteReader instance
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*
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* Returns the current position of a #GstByteReader instance in bytes.
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*
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* Returns: The current position of @reader in bytes.
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*/
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guint
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gst_byte_reader_get_pos (const GstByteReader * reader)
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{
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return _gst_byte_reader_get_pos_inline (reader);
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}
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/**
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* gst_byte_reader_get_remaining:
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* @reader: a #GstByteReader instance
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*
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* Returns the remaining number of bytes of a #GstByteReader instance.
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*
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* Returns: The remaining number of bytes of @reader instance.
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*/
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guint
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gst_byte_reader_get_remaining (const GstByteReader * reader)
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{
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return _gst_byte_reader_get_remaining_inline (reader);
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}
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/**
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* gst_byte_reader_get_size:
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* @reader: a #GstByteReader instance
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*
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* Returns the total number of bytes of a #GstByteReader instance.
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*
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* Returns: The total number of bytes of @reader instance.
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*/
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guint
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gst_byte_reader_get_size (const GstByteReader * reader)
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{
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return _gst_byte_reader_get_size_inline (reader);
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}
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#define gst_byte_reader_get_remaining _gst_byte_reader_get_remaining_inline
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#define gst_byte_reader_get_size _gst_byte_reader_get_size_inline
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/**
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* gst_byte_reader_skip:
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* @reader: a #GstByteReader instance
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* @nbytes: the number of bytes to skip
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*
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* Skips @nbytes bytes of the #GstByteReader instance.
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*
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* Returns: %TRUE if @nbytes bytes could be skipped, %FALSE otherwise.
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*/
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gboolean
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gst_byte_reader_skip (GstByteReader * reader, guint nbytes)
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{
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return _gst_byte_reader_skip_inline (reader, nbytes);
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}
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/**
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* gst_byte_reader_get_uint8:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint8 to store the result
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*
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* Read an unsigned 8 bit integer into @val and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int8:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint8 to store the result
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*
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* Read a signed 8 bit integer into @val and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint8:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint8 to store the result
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*
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* Read an unsigned 8 bit integer into @val but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int8:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint8 to store the result
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*
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* Read a signed 8 bit integer into @val but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint16_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint16 to store the result
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*
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* Read an unsigned 16 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int16_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint16 to store the result
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*
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* Read a signed 16 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint16_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint16 to store the result
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*
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* Read an unsigned 16 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int16_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint16 to store the result
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*
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* Read a signed 16 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint16_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint16 to store the result
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*
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* Read an unsigned 16 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int16_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint16 to store the result
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*
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* Read a signed 16 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint16_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint16 to store the result
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*
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* Read an unsigned 16 bit big endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int16_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint16 to store the result
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*
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* Read a signed 16 bit big endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint24_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 24 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int24_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 24 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint24_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 24 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int24_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 24 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint24_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 24 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int24_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 24 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint24_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 24 bit big endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int24_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 24 bit big endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint32_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 32 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int32_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 32 bit little endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint32_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 32 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_int32_le:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 32 bit little endian integer into @val
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* but keep the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_uint32_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #guint32 to store the result
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*
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* Read an unsigned 32 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_get_int32_be:
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* @reader: a #GstByteReader instance
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* @val: (out): Pointer to a #gint32 to store the result
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*
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* Read a signed 32 bit big endian integer into @val
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* and update the current position.
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*
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* Returns: %TRUE if successful, %FALSE otherwise.
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*/
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/**
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* gst_byte_reader_peek_uint32_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #guint32 to store the result
|
|
*
|
|
* Read an unsigned 32 bit big endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_int32_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gint32 to store the result
|
|
*
|
|
* Read a signed 32 bit big endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_uint64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #guint64 to store the result
|
|
*
|
|
* Read an unsigned 64 bit little endian integer into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_int64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gint64 to store the result
|
|
*
|
|
* Read a signed 64 bit little endian integer into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_uint64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #guint64 to store the result
|
|
*
|
|
* Read an unsigned 64 bit little endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_int64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gint64 to store the result
|
|
*
|
|
* Read a signed 64 bit little endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_uint64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #guint64 to store the result
|
|
*
|
|
* Read an unsigned 64 bit big endian integer into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_int64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gint64 to store the result
|
|
*
|
|
* Read a signed 64 bit big endian integer into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_uint64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #guint64 to store the result
|
|
*
|
|
* Read an unsigned 64 bit big endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_int64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gint64 to store the result
|
|
*
|
|
* Read a signed 64 bit big endian integer into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
#define GST_BYTE_READER_PEEK_GET(bits,type,name) \
|
|
gboolean \
|
|
gst_byte_reader_get_##name (GstByteReader * reader, type * val) \
|
|
{ \
|
|
return _gst_byte_reader_get_##name##_inline (reader, val); \
|
|
} \
|
|
\
|
|
gboolean \
|
|
gst_byte_reader_peek_##name (const GstByteReader * reader, type * val) \
|
|
{ \
|
|
return _gst_byte_reader_peek_##name##_inline (reader, val); \
|
|
}
|
|
|
|
/* *INDENT-OFF* */
|
|
|
|
GST_BYTE_READER_PEEK_GET(8,guint8,uint8)
|
|
GST_BYTE_READER_PEEK_GET(8,gint8,int8)
|
|
|
|
GST_BYTE_READER_PEEK_GET(16,guint16,uint16_le)
|
|
GST_BYTE_READER_PEEK_GET(16,guint16,uint16_be)
|
|
GST_BYTE_READER_PEEK_GET(16,gint16,int16_le)
|
|
GST_BYTE_READER_PEEK_GET(16,gint16,int16_be)
|
|
|
|
GST_BYTE_READER_PEEK_GET(24,guint32,uint24_le)
|
|
GST_BYTE_READER_PEEK_GET(24,guint32,uint24_be)
|
|
GST_BYTE_READER_PEEK_GET(24,gint32,int24_le)
|
|
GST_BYTE_READER_PEEK_GET(24,gint32,int24_be)
|
|
|
|
GST_BYTE_READER_PEEK_GET(32,guint32,uint32_le)
|
|
GST_BYTE_READER_PEEK_GET(32,guint32,uint32_be)
|
|
GST_BYTE_READER_PEEK_GET(32,gint32,int32_le)
|
|
GST_BYTE_READER_PEEK_GET(32,gint32,int32_be)
|
|
|
|
GST_BYTE_READER_PEEK_GET(64,guint64,uint64_le)
|
|
GST_BYTE_READER_PEEK_GET(64,guint64,uint64_be)
|
|
GST_BYTE_READER_PEEK_GET(64,gint64,int64_le)
|
|
GST_BYTE_READER_PEEK_GET(64,gint64,int64_be)
|
|
|
|
/**
|
|
* gst_byte_reader_get_float32_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gfloat to store the result
|
|
*
|
|
* Read a 32 bit little endian floating point value into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_float32_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gfloat to store the result
|
|
*
|
|
* Read a 32 bit little endian floating point value into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_float32_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gfloat to store the result
|
|
*
|
|
* Read a 32 bit big endian floating point value into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_float32_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gfloat to store the result
|
|
*
|
|
* Read a 32 bit big endian floating point value into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_float64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gdouble to store the result
|
|
*
|
|
* Read a 64 bit little endian floating point value into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_float64_le:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gdouble to store the result
|
|
*
|
|
* Read a 64 bit little endian floating point value into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_get_float64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gdouble to store the result
|
|
*
|
|
* Read a 64 bit big endian floating point value into @val
|
|
* and update the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
/**
|
|
* gst_byte_reader_peek_float64_be:
|
|
* @reader: a #GstByteReader instance
|
|
* @val: (out): Pointer to a #gdouble to store the result
|
|
*
|
|
* Read a 64 bit big endian floating point value into @val
|
|
* but keep the current position.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
|
|
GST_BYTE_READER_PEEK_GET(32,gfloat,float32_le)
|
|
GST_BYTE_READER_PEEK_GET(32,gfloat,float32_be)
|
|
GST_BYTE_READER_PEEK_GET(64,gdouble,float64_le)
|
|
GST_BYTE_READER_PEEK_GET(64,gdouble,float64_be)
|
|
|
|
/* *INDENT-ON* */
|
|
|
|
/**
|
|
* gst_byte_reader_get_data:
|
|
* @reader: a #GstByteReader instance
|
|
* @size: Size in bytes
|
|
* @val: (out) (transfer none) (array length=size): address of a
|
|
* #guint8 pointer variable in which to store the result
|
|
*
|
|
* Returns a constant pointer to the current data
|
|
* position if at least @size bytes are left and
|
|
* updates the current position.
|
|
*
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_byte_reader_get_data (GstByteReader * reader, guint size,
|
|
const guint8 ** val)
|
|
{
|
|
return _gst_byte_reader_get_data_inline (reader, size, val);
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_peek_data:
|
|
* @reader: a #GstByteReader instance
|
|
* @size: Size in bytes
|
|
* @val: (out) (transfer none) (array length=size): address of a
|
|
* #guint8 pointer variable in which to store the result
|
|
*
|
|
* Returns a constant pointer to the current data
|
|
* position if at least @size bytes are left and
|
|
* keeps the current position.
|
|
*
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_byte_reader_peek_data (const GstByteReader * reader, guint size,
|
|
const guint8 ** val)
|
|
{
|
|
return _gst_byte_reader_peek_data_inline (reader, size, val);
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_dup_data:
|
|
* @reader: a #GstByteReader instance
|
|
* @size: Size in bytes
|
|
* @val: (out) (transfer full) (array length=size): address of a
|
|
* #guint8 pointer variable in which to store the result
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* Returns a newly-allocated copy of the current data
|
|
* position if at least @size bytes are left and
|
|
* updates the current position. Free with g_free() when no longer needed.
|
|
*
|
|
* Returns: %TRUE if successful, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_byte_reader_dup_data (GstByteReader * reader, guint size, guint8 ** val)
|
|
{
|
|
return _gst_byte_reader_dup_data_inline (reader, size, val);
|
|
}
|
|
|
|
/* Special optimized scan for mask 0xffffff00 and pattern 0x00000100 */
|
|
static inline gint
|
|
_scan_for_start_code (const guint8 * data, guint offset, guint size)
|
|
{
|
|
guint8 *pdata = (guint8 *) data;
|
|
guint8 *pend = (guint8 *) (data + size - 4);
|
|
|
|
while (pdata <= pend) {
|
|
if (pdata[2] > 1) {
|
|
pdata += 3;
|
|
} else if (pdata[1]) {
|
|
pdata += 2;
|
|
} else if (pdata[0] || pdata[2] != 1) {
|
|
pdata++;
|
|
} else {
|
|
return (pdata - data + offset);
|
|
}
|
|
}
|
|
|
|
/* nothing found */
|
|
return -1;
|
|
}
|
|
|
|
static inline guint
|
|
_masked_scan_uint32_peek (const GstByteReader * reader,
|
|
guint32 mask, guint32 pattern, guint offset, guint size, guint32 * value)
|
|
{
|
|
const guint8 *data;
|
|
guint32 state;
|
|
guint i;
|
|
|
|
g_return_val_if_fail (size > 0, -1);
|
|
g_return_val_if_fail ((guint64) offset + size <= reader->size - reader->byte,
|
|
-1);
|
|
|
|
/* we can't find the pattern with less than 4 bytes */
|
|
if (G_UNLIKELY (size < 4))
|
|
return -1;
|
|
|
|
data = reader->data + reader->byte + offset;
|
|
|
|
/* Handle special case found in MPEG and H264 */
|
|
if ((pattern == 0x00000100) && (mask == 0xffffff00)) {
|
|
guint ret = _scan_for_start_code (data, offset, size);
|
|
if (G_UNLIKELY (value))
|
|
*value = (1 << 8) | data[ret + 3];
|
|
return ret;
|
|
}
|
|
|
|
/* set the state to something that does not match */
|
|
state = ~pattern;
|
|
|
|
/* now find data */
|
|
for (i = 0; i < size; i++) {
|
|
/* throw away one byte and move in the next byte */
|
|
state = ((state << 8) | data[i]);
|
|
if (G_UNLIKELY ((state & mask) == pattern)) {
|
|
/* we have a match but we need to have skipped at
|
|
* least 4 bytes to fill the state. */
|
|
if (G_LIKELY (i >= 3)) {
|
|
if (value)
|
|
*value = state;
|
|
return offset + i - 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* nothing found */
|
|
return -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_byte_reader_masked_scan_uint32:
|
|
* @reader: a #GstByteReader
|
|
* @mask: mask to apply to data before matching against @pattern
|
|
* @pattern: pattern to match (after mask is applied)
|
|
* @offset: offset from which to start scanning, relative to the current
|
|
* position
|
|
* @size: number of bytes to scan from offset
|
|
*
|
|
* Scan for pattern @pattern with applied mask @mask in the byte reader data,
|
|
* starting from offset @offset relative to the current position.
|
|
*
|
|
* The bytes in @pattern and @mask are interpreted left-to-right, regardless
|
|
* of endianness. All four bytes of the pattern must be present in the
|
|
* byte reader data for it to match, even if the first or last bytes are masked
|
|
* out.
|
|
*
|
|
* It is an error to call this function without making sure that there is
|
|
* enough data (offset+size bytes) in the byte reader.
|
|
*
|
|
* Returns: offset of the first match, or -1 if no match was found.
|
|
*
|
|
* Example:
|
|
* <programlisting>
|
|
* // Assume the reader contains 0x00 0x01 0x02 ... 0xfe 0xff
|
|
*
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x00010203, 0, 256);
|
|
* // -> returns 0
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x00010203, 1, 255);
|
|
* // -> returns -1
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x01020304, 1, 255);
|
|
* // -> returns 1
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff, 0x0001, 0, 256);
|
|
* // -> returns -1
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff, 0x0203, 0, 256);
|
|
* // -> returns 0
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff0000, 0x02030000, 0, 256);
|
|
* // -> returns 2
|
|
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff0000, 0x02030000, 0, 4);
|
|
* // -> returns -1
|
|
* </programlisting>
|
|
*/
|
|
guint
|
|
gst_byte_reader_masked_scan_uint32 (const GstByteReader * reader, guint32 mask,
|
|
guint32 pattern, guint offset, guint size)
|
|
{
|
|
return _masked_scan_uint32_peek (reader, mask, pattern, offset, size, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_masked_scan_uint32_peek:
|
|
* @reader: a #GstByteReader
|
|
* @mask: mask to apply to data before matching against @pattern
|
|
* @pattern: pattern to match (after mask is applied)
|
|
* @offset: offset from which to start scanning, relative to the current
|
|
* position
|
|
* @size: number of bytes to scan from offset
|
|
* @value: pointer to uint32 to return matching data
|
|
*
|
|
* Scan for pattern @pattern with applied mask @mask in the byte reader data,
|
|
* starting from offset @offset relative to the current position.
|
|
*
|
|
* The bytes in @pattern and @mask are interpreted left-to-right, regardless
|
|
* of endianness. All four bytes of the pattern must be present in the
|
|
* byte reader data for it to match, even if the first or last bytes are masked
|
|
* out.
|
|
*
|
|
* It is an error to call this function without making sure that there is
|
|
* enough data (offset+size bytes) in the byte reader.
|
|
*
|
|
* Returns: offset of the first match, or -1 if no match was found.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
guint
|
|
gst_byte_reader_masked_scan_uint32_peek (const GstByteReader * reader,
|
|
guint32 mask, guint32 pattern, guint offset, guint size, guint32 * value)
|
|
{
|
|
return _masked_scan_uint32_peek (reader, mask, pattern, offset, size, value);
|
|
}
|
|
|
|
#define GST_BYTE_READER_SCAN_STRING(bits) \
|
|
static guint \
|
|
gst_byte_reader_scan_string_utf##bits (const GstByteReader * reader) \
|
|
{ \
|
|
guint len, off, max_len; \
|
|
\
|
|
max_len = (reader->size - reader->byte) / sizeof (guint##bits); \
|
|
\
|
|
/* need at least a single NUL terminator */ \
|
|
if (max_len < 1) \
|
|
return 0; \
|
|
\
|
|
len = 0; \
|
|
off = reader->byte; \
|
|
/* endianness does not matter if we are looking for a NUL terminator */ \
|
|
while (GST_READ_UINT##bits##_LE (&reader->data[off]) != 0) { \
|
|
++len; \
|
|
off += sizeof (guint##bits); \
|
|
/* have we reached the end without finding a NUL terminator? */ \
|
|
if (len == max_len) \
|
|
return 0; \
|
|
} \
|
|
/* return size in bytes including the NUL terminator (hence the +1) */ \
|
|
return (len + 1) * sizeof (guint##bits); \
|
|
}
|
|
|
|
#define GST_READ_UINT8_LE GST_READ_UINT8
|
|
GST_BYTE_READER_SCAN_STRING (8);
|
|
#undef GST_READ_UINT8_LE
|
|
GST_BYTE_READER_SCAN_STRING (16);
|
|
GST_BYTE_READER_SCAN_STRING (32);
|
|
|
|
#define GST_BYTE_READER_SKIP_STRING(bits) \
|
|
gboolean \
|
|
gst_byte_reader_skip_string_utf##bits (GstByteReader * reader) \
|
|
{ \
|
|
guint size; /* size in bytes including the terminator */ \
|
|
\
|
|
g_return_val_if_fail (reader != NULL, FALSE); \
|
|
\
|
|
size = gst_byte_reader_scan_string_utf##bits (reader); \
|
|
reader->byte += size; \
|
|
return (size > 0); \
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_skip_string:
|
|
* @reader: a #GstByteReader instance
|
|
*
|
|
* Skips a NUL-terminated string in the #GstByteReader instance, advancing
|
|
* the current position to the byte after the string. This will work for
|
|
* any NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
/**
|
|
* gst_byte_reader_skip_string_utf8:
|
|
* @reader: a #GstByteReader instance
|
|
*
|
|
* Skips a NUL-terminated string in the #GstByteReader instance, advancing
|
|
* the current position to the byte after the string. This will work for
|
|
* any NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc. No input checking for valid UTF-8 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
GST_BYTE_READER_SKIP_STRING (8);
|
|
|
|
/**
|
|
* gst_byte_reader_skip_string_utf16:
|
|
* @reader: a #GstByteReader instance
|
|
*
|
|
* Skips a NUL-terminated UTF-16 string in the #GstByteReader instance,
|
|
* advancing the current position to the byte after the string.
|
|
*
|
|
* No input checking for valid UTF-16 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
GST_BYTE_READER_SKIP_STRING (16);
|
|
|
|
/**
|
|
* gst_byte_reader_skip_string_utf32:
|
|
* @reader: a #GstByteReader instance
|
|
*
|
|
* Skips a NUL-terminated UTF-32 string in the #GstByteReader instance,
|
|
* advancing the current position to the byte after the string.
|
|
*
|
|
* No input checking for valid UTF-32 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
GST_BYTE_READER_SKIP_STRING (32);
|
|
|
|
/**
|
|
* gst_byte_reader_peek_string:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer none) (array zero-terminated=1): address of a
|
|
* #gchar pointer variable in which to store the result
|
|
*
|
|
* Returns a constant pointer to the current data position if there is
|
|
* a NUL-terminated string in the data (this could be just a NUL terminator).
|
|
* The current position will be maintained. This will work for any
|
|
* NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
/**
|
|
* gst_byte_reader_peek_string_utf8:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer none) (array zero-terminated=1): address of a
|
|
* #gchar pointer variable in which to store the result
|
|
*
|
|
* Returns a constant pointer to the current data position if there is
|
|
* a NUL-terminated string in the data (this could be just a NUL terminator).
|
|
* The current position will be maintained. This will work for any
|
|
* NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc.
|
|
*
|
|
* No input checking for valid UTF-8 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be skipped, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_byte_reader_peek_string_utf8 (const GstByteReader * reader,
|
|
const gchar ** str)
|
|
{
|
|
g_return_val_if_fail (reader != NULL, FALSE);
|
|
g_return_val_if_fail (str != NULL, FALSE);
|
|
|
|
if (gst_byte_reader_scan_string_utf8 (reader) > 0) {
|
|
*str = (const gchar *) (reader->data + reader->byte);
|
|
} else {
|
|
*str = NULL;
|
|
}
|
|
return (*str != NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_get_string_utf8:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer none) (array zero-terminated=1): address of a
|
|
* #gchar pointer variable in which to store the result
|
|
*
|
|
* Returns a constant pointer to the current data position if there is
|
|
* a NUL-terminated string in the data (this could be just a NUL terminator),
|
|
* advancing the current position to the byte after the string. This will work
|
|
* for any NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc.
|
|
*
|
|
* No input checking for valid UTF-8 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be found, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_byte_reader_get_string_utf8 (GstByteReader * reader, const gchar ** str)
|
|
{
|
|
guint size; /* size in bytes including the terminator */
|
|
|
|
g_return_val_if_fail (reader != NULL, FALSE);
|
|
g_return_val_if_fail (str != NULL, FALSE);
|
|
|
|
size = gst_byte_reader_scan_string_utf8 (reader);
|
|
if (size == 0) {
|
|
*str = NULL;
|
|
return FALSE;
|
|
}
|
|
|
|
*str = (const gchar *) (reader->data + reader->byte);
|
|
reader->byte += size;
|
|
return TRUE;
|
|
}
|
|
|
|
#define GST_BYTE_READER_DUP_STRING(bits,type) \
|
|
gboolean \
|
|
gst_byte_reader_dup_string_utf##bits (GstByteReader * reader, type ** str) \
|
|
{ \
|
|
guint size; /* size in bytes including the terminator */ \
|
|
\
|
|
g_return_val_if_fail (reader != NULL, FALSE); \
|
|
g_return_val_if_fail (str != NULL, FALSE); \
|
|
\
|
|
size = gst_byte_reader_scan_string_utf##bits (reader); \
|
|
if (size == 0) { \
|
|
*str = NULL; \
|
|
return FALSE; \
|
|
} \
|
|
*str = g_memdup (reader->data + reader->byte, size); \
|
|
reader->byte += size; \
|
|
return TRUE; \
|
|
}
|
|
|
|
/**
|
|
* gst_byte_reader_dup_string_utf8:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer full) (array zero-terminated=1): address of a
|
|
* #gchar pointer variable in which to store the result
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* FIXME:Reads (copies) a NUL-terminated string in the #GstByteReader instance,
|
|
* advancing the current position to the byte after the string. This will work
|
|
* for any NUL-terminated string with a character width of 8 bits, so ASCII,
|
|
* UTF-8, ISO-8859-N etc. No input checking for valid UTF-8 is done.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Returns: %TRUE if a string could be read into @str, %FALSE otherwise. The
|
|
* string put into @str must be freed with g_free() when no longer needed.
|
|
*/
|
|
GST_BYTE_READER_DUP_STRING (8, gchar);
|
|
|
|
/**
|
|
* gst_byte_reader_dup_string_utf16:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer full) (array zero-terminated=1): address of a
|
|
* #guint16 pointer variable in which to store the result
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* Returns a newly-allocated copy of the current data position if there is
|
|
* a NUL-terminated UTF-16 string in the data (this could be an empty string
|
|
* as well), and advances the current position.
|
|
*
|
|
* No input checking for valid UTF-16 is done. This function is endianness
|
|
* agnostic - you should not assume the UTF-16 characters are in host
|
|
* endianness.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Note: there is no peek or get variant of this function to ensure correct
|
|
* byte alignment of the UTF-16 string.
|
|
*
|
|
* Returns: %TRUE if a string could be read, %FALSE otherwise. The
|
|
* string put into @str must be freed with g_free() when no longer needed.
|
|
*/
|
|
GST_BYTE_READER_DUP_STRING (16, guint16);
|
|
|
|
/**
|
|
* gst_byte_reader_dup_string_utf32:
|
|
* @reader: a #GstByteReader instance
|
|
* @str: (out) (transfer full) (array zero-terminated=1): address of a
|
|
* #guint32 pointer variable in which to store the result
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* Returns a newly-allocated copy of the current data position if there is
|
|
* a NUL-terminated UTF-32 string in the data (this could be an empty string
|
|
* as well), and advances the current position.
|
|
*
|
|
* No input checking for valid UTF-32 is done. This function is endianness
|
|
* agnostic - you should not assume the UTF-32 characters are in host
|
|
* endianness.
|
|
*
|
|
* This function will fail if no NUL-terminator was found in in the data.
|
|
*
|
|
* Note: there is no peek or get variant of this function to ensure correct
|
|
* byte alignment of the UTF-32 string.
|
|
*
|
|
* Returns: %TRUE if a string could be read, %FALSE otherwise. The
|
|
* string put into @str must be freed with g_free() when no longer needed.
|
|
*/
|
|
GST_BYTE_READER_DUP_STRING (32, guint32);
|