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Always use the unaligned variants of GST_READ_UINT* and GST_WRITE_UINT* as it's too easy to break the ISO C strict al...

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Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstutils.h:
Always use the unaligned variants of GST_READ_UINT* and GST_WRITE_UINT*
as it's too easy to break the ISO C strict aliasing rules with simple
casts to the corresponding type and this would introduce hard to debug
bugs. Fixes bug #545714.
API: Add GST_READ_UINT24_(LE|BE) and GST_WRITE_UINT24_(LE|BE).
This commit is contained in:
Sebastian Dröge 2008-10-07 12:00:49 +00:00
parent cabf154dc6
commit 22dd04f7e0
4 changed files with 160 additions and 121 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2008-10-07 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* docs/gst/gstreamer-sections.txt:
* gst/gstutils.h:
Always use the unaligned variants of GST_READ_UINT* and GST_WRITE_UINT*
as it's too easy to break the ISO C strict aliasing rules with simple
casts to the corresponding type and this would introduce hard to debug
bugs. Fixes bug #545714.
API: Add GST_READ_UINT24_(LE|BE) and GST_WRITE_UINT24_(LE|BE).
2008-10-07 Tim-Philipp Müller <tim.muller at collabora co uk>
* gst/gstbuffer.h: (GST_BUFFER_FREE_FUNC):

2
common

@ -1 +1 @@
Subproject commit ea93f2ed580bcc19322e4c07f677eda980c821eb
Subproject commit 46eefd2f8474ee748864c59635be87b5a29317d1

4
docs/gst/gstreamer-sections.txt
View file

@ -2266,6 +2266,8 @@ GST_CALL_PARENT_WITH_DEFAULT
GST_READ_UINT8
GST_READ_UINT16_LE
GST_READ_UINT16_BE
GST_READ_UINT24_LE
GST_READ_UINT24_BE
GST_READ_UINT32_LE
GST_READ_UINT32_BE
GST_READ_UINT64_LE
@ -2273,6 +2275,8 @@ GST_READ_UINT64_BE
GST_WRITE_UINT8
GST_WRITE_UINT16_LE
GST_WRITE_UINT16_BE
GST_WRITE_UINT24_LE
GST_WRITE_UINT24_BE
GST_WRITE_UINT32_LE
GST_WRITE_UINT32_BE
GST_WRITE_UINT64_LE

264
gst/gstutils.h
View file

@ -272,12 +272,12 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : def_return)
/* Define possibly unaligned memory access method whether the type of
* architecture. */
#if GST_HAVE_UNALIGNED_ACCESS
/* Define PUT and GET functions for unaligned memory */
#define _GST_GET(__data, __idx, __size, __shift) \
(((guint##__size) (((guint8 *) (__data))[__idx])) << __shift)
#define _GST_GET(__data, __size, __end) \
(GUINT##__size##_FROM_##__end (* ((guint##__size *) (__data))))
#define _GST_PUT(__data, __idx, __size, __shift, __num) \
(((guint8 *) (__data))[__idx] = (((guint##__size) __num) >> __shift) & 0xff)
/**
* GST_READ_UINT64_BE:
@ -285,115 +285,6 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
*
* Read a 64 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT64_BE(data) _GST_GET (data, 64, BE)
/**
* GST_READ_UINT64_LE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT64_LE(data) _GST_GET (data, 64, LE)
/**
* GST_READ_UINT32_BE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT32_BE(data) _GST_GET (data, 32, BE)
/**
* GST_READ_UINT32_LE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT32_LE(data) _GST_GET (data, 32, LE)
/**
* GST_READ_UINT16_BE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT16_BE(data) _GST_GET (data, 16, BE)
/**
* GST_READ_UINT16_LE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT16_LE(data) _GST_GET (data, 16, LE)
/**
* GST_READ_UINT8:
* @data: memory location
*
* Read an 8 bit unsigned integer value from the memory buffer.
*/
#define GST_READ_UINT8(data) (* ((guint8 *) (data)))
#define _GST_PUT(__data, __size, __end, __num) \
((* (guint##__size *) (__data)) = GUINT##__size##_TO_##__end (__num))
/**
* GST_WRITE_UINT64_BE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_BE(data, num) _GST_PUT(data, 64, BE, num)
/**
* GST_WRITE_UINT64_LE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_LE(data, num) _GST_PUT(data, 64, LE, num)
/**
* GST_WRITE_UINT32_BE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_BE(data, num) _GST_PUT(data, 32, BE, num)
/**
* GST_WRITE_UINT32_LE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_LE(data, num) _GST_PUT(data, 32, LE, num)
/**
* GST_WRITE_UINT16_BE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_BE(data, num) _GST_PUT(data, 16, BE, num)
/**
* GST_WRITE_UINT16_LE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_LE(data, num) _GST_PUT(data, 16, LE, num)
/**
* GST_WRITE_UINT8:
* @data: memory location
* @num: value to store
*
* Store an 8 bit unsigned integer value into the memory buffer.
*/
#define GST_WRITE_UINT8(data, num) ((* (guint8 *) (data)) = (num))
#else /* GST_HAVE_UNALIGNED_ACCESS */
#define _GST_GET(__data, __idx, __size, __shift) \
(((guint##__size) (((guint8 *) (__data))[__idx])) << __shift)
#define GST_READ_UINT64_BE(data) (_GST_GET (data, 0, 64, 56) | \
_GST_GET (data, 1, 64, 48) | \
_GST_GET (data, 2, 64, 40) | \
@ -403,6 +294,12 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_GET (data, 6, 64, 8) | \
_GST_GET (data, 7, 64, 0))
/**
* GST_READ_UINT64_LE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT64_LE(data) (_GST_GET (data, 7, 64, 56) | \
_GST_GET (data, 6, 64, 48) | \
_GST_GET (data, 5, 64, 40) | \
@ -412,27 +309,85 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_GET (data, 1, 64, 8) | \
_GST_GET (data, 0, 64, 0))
/**
* GST_READ_UINT32_BE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT32_BE(data) (_GST_GET (data, 0, 32, 24) | \
_GST_GET (data, 1, 32, 16) | \
_GST_GET (data, 2, 32, 8) | \
_GST_GET (data, 3, 32, 0))
/**
* GST_READ_UINT32_LE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT32_LE(data) (_GST_GET (data, 3, 32, 24) | \
_GST_GET (data, 2, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 0, 32, 0))
/**
* GST_READ_UINT24_BE:
* @data: memory location
*
* Read a 24 bit unsigned integer value in big endian format from the memory buffer.
*
* Since: 0.10.22
*/
#define GST_READ_UINT24_BE(data) (_GST_GET (data, 0, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 2, 32, 0))
/**
* GST_READ_UINT24_LE:
* @data: memory location
*
* Read a 24 bit unsigned integer value in little endian format from the memory buffer.
*
* Since: 0.10.22
*/
#define GST_READ_UINT24_LE(data) (_GST_GET (data, 2, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 0, 32, 0))
/**
* GST_READ_UINT16_BE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT16_BE(data) (_GST_GET (data, 0, 16, 8) | \
_GST_GET (data, 1, 16, 0))
/**
* GST_READ_UINT16_LE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT16_LE(data) (_GST_GET (data, 1, 16, 8) | \
_GST_GET (data, 0, 16, 0))
/**
* GST_READ_UINT8:
* @data: memory location
*
* Read an 8 bit unsigned integer value from the memory buffer.
*/
#define GST_READ_UINT8(data) (_GST_GET (data, 0, 8, 0))
#define _GST_PUT(__data, __idx, __size, __shift, __num) \
(((guint8 *) (__data))[__idx] = (((guint##__size) __num) >> __shift) & 0xff)
/**
* GST_WRITE_UINT64_BE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_BE(data, num) do { \
_GST_PUT (data, 0, 64, 56, num); \
_GST_PUT (data, 1, 64, 48, num); \
@ -444,6 +399,13 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_PUT (data, 7, 64, 0, num); \
} while (0)
/**
* GST_WRITE_UINT64_LE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_LE(data, num) do { \
_GST_PUT (data, 0, 64, 0, num); \
_GST_PUT (data, 1, 64, 8, num); \
@ -455,6 +417,13 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_PUT (data, 7, 64, 56, num); \
} while (0)
/**
* GST_WRITE_UINT32_BE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_BE(data, num) do { \
_GST_PUT (data, 0, 32, 24, num); \
_GST_PUT (data, 1, 32, 16, num); \
@ -462,6 +431,13 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_PUT (data, 3, 32, 0, num); \
} while (0)
/**
* GST_WRITE_UINT32_LE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_LE(data, num) do { \
_GST_PUT (data, 0, 32, 0, num); \
_GST_PUT (data, 1, 32, 8, num); \
@ -469,23 +445,71 @@ GST_BOILERPLATE_FULL (type, type_as_function, parent_type, \
_GST_PUT (data, 3, 32, 24, num); \
} while (0)
/**
* GST_WRITE_UINT24_BE:
* @data: memory location
* @num: value to store
*
* Store a 24 bit unsigned integer value in big endian format into the memory buffer.
*
* Since: 0.10.22
*/
#define GST_WRITE_UINT24_BE(data, num) do { \
_GST_PUT (data, 0, 32, 16, num); \
_GST_PUT (data, 1, 32, 8, num); \
_GST_PUT (data, 2, 32, 0, num); \
} while (0)
/**
* GST_WRITE_UINT24_LE:
* @data: memory location
* @num: value to store
*
* Store a 24 bit unsigned integer value in little endian format into the memory buffer.
*
* Since: 0.10.22
*/
#define GST_WRITE_UINT24_LE(data, num) do { \
_GST_PUT (data, 0, 32, 0, num); \
_GST_PUT (data, 1, 32, 8, num); \
_GST_PUT (data, 2, 32, 16, num); \
} while (0)
/**
* GST_WRITE_UINT16_BE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_BE(data, num) do { \
_GST_PUT (data, 0, 16, 8, num); \
_GST_PUT (data, 1, 16, 0, num); \
} while (0)
/**
* GST_WRITE_UINT16_LE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_LE(data, num) do { \
_GST_PUT (data, 0, 16, 0, num); \
_GST_PUT (data, 1, 16, 8, num); \
} while (0)
/**
* GST_WRITE_UINT8:
* @data: memory location
* @num: value to store
*
* Store an 8 bit unsigned integer value into the memory buffer.
*/
#define GST_WRITE_UINT8(data, num) do { \
_GST_PUT (data, 0, 8, 0, num); \
} while (0)
#endif /* GST_HAVE_UNALIGNED_ACCESS */
/* Miscellaneous utility macros */
/**