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Issue #16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and unified

Browse source 
endianess detection and handling.
This commit is contained in:
Christian Heimes 2012-10-17 23:52:17 +02:00
parent 1e9af84e2e
commit 743e0cd6b5
15 changed files with 78 additions and 107 deletions
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14
Include/pyport.h
View file

@ -865,4 +865,18 @@ extern pid_t forkpty(int *, char *, struct termios *, struct winsize *);
#endif
#endif
/*
* Convenient macros to deal with endianess of the platform. WORDS_BIGENDIAN is
* detected by configure and defined in pyconfig.h. The code in pyconfig.h
* also also takes care of Apple's universal builds.
*/
#ifdef WORDS_BIGENDIAN
#define PY_BIG_ENDIAN 1
#define PY_LITTLE_ENDIAN 0
#else
#define PY_BIG_ENDIAN 0
#define PY_LITTLE_ENDIAN 1
#endif
#endif /* Py_PYPORT_H */

3
Misc/NEWS
View file

@ -10,6 +10,9 @@ What's New in Python 3.4.0 Alpha 1?
Core and Builtins
-----------------
- Issue #16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and unified
endianess detection and handling.
- Issue #15958: bytes.join and bytearray.join now accept arbitrary buffer
objects.

18
Modules/_io/textio.c
View file

@ -747,7 +747,7 @@ utf16_encode(textio *self, PyObject *text)
{
if (!self->encoding_start_of_stream) {
/* Skip the BOM and use native byte ordering */
#if defined(WORDS_BIGENDIAN)
#if PY_BIG_ENDIAN
return utf16be_encode(self, text);
#else
return utf16le_encode(self, text);
@ -776,7 +776,7 @@ utf32_encode(textio *self, PyObject *text)
{
if (!self->encoding_start_of_stream) {
/* Skip the BOM and use native byte ordering */
#if defined(WORDS_BIGENDIAN)
#if PY_BIG_ENDIAN
return utf32be_encode(self, text);
#else
return utf32le_encode(self, text);
@ -1913,10 +1913,7 @@ typedef struct {
#define COOKIE_BUF_LEN (sizeof(Py_off_t) + 3 * sizeof(int) + sizeof(char))
#if defined(WORDS_BIGENDIAN)
# define IS_LITTLE_ENDIAN 0
#if PY_BIG_ENDIAN
/* We want the least significant byte of start_pos to also be the least
significant byte of the cookie, which means that in big-endian mode we
must copy the fields in reverse order. */
@ -1928,9 +1925,6 @@ typedef struct {
# define OFF_NEED_EOF 0
#else
# define IS_LITTLE_ENDIAN 1
/* Little-endian mode: the least significant byte of start_pos will
naturally end up the least significant byte of the cookie. */
@ -1951,7 +1945,7 @@ textiowrapper_parse_cookie(cookie_type *cookie, PyObject *cookieObj)
return -1;
if (_PyLong_AsByteArray(cookieLong, buffer, sizeof(buffer),
IS_LITTLE_ENDIAN, 0) < 0) {
PY_LITTLE_ENDIAN, 0) < 0) {
Py_DECREF(cookieLong);
return -1;
}
@ -1977,9 +1971,9 @@ textiowrapper_build_cookie(cookie_type *cookie)
memcpy(buffer + OFF_CHARS_TO_SKIP, &cookie->chars_to_skip, sizeof(cookie->chars_to_skip));
memcpy(buffer + OFF_NEED_EOF, &cookie->need_eof, sizeof(cookie->need_eof));
return _PyLong_FromByteArray(buffer, sizeof(buffer), IS_LITTLE_ENDIAN, 0);
return _PyLong_FromByteArray(buffer, sizeof(buffer),
PY_LITTLE_ENDIAN, 0);
}
#undef IS_LITTLE_ENDIAN
static int
_textiowrapper_decoder_setstate(textio *self, cookie_type *cookie)

8
Modules/_sha3/cleanup.py
View file

@ -32,10 +32,10 @@ def cleanup(f):
if line.startswith("typedef unsigned long long int"):
buf.append("/* %s */\n" % line.strip())
continue
## remove #include "brg_endian.h"
#if "brg_endian.h" in line:
# buf.append("/* %s */\n" % line.strip())
# continue
# remove #include "brg_endian.h"
if "brg_endian.h" in line:
buf.append("/* %s */\n" % line.strip())
continue
# transform C++ comments into ANSI C comments
line = CPP1.sub(r"/* \1 */", line)
line = CPP2.sub(r" /* \1 */", line)

2
Modules/_sha3/keccak/KeccakF-1600-opt32.c
View file

@ -12,7 +12,7 @@ and related or neighboring rights to the source code in this file.
*/
#include <string.h>
#include "brg_endian.h"
/* #include "brg_endian.h" */
#include "KeccakF-1600-opt32-settings.h"
#include "KeccakF-1600-interface.h"

2
Modules/_sha3/keccak/KeccakF-1600-opt64.c
View file

@ -12,7 +12,7 @@ and related or neighboring rights to the source code in this file.
*/
#include <string.h>
#include "brg_endian.h"
/* #include "brg_endian.h" */
#include "KeccakF-1600-opt64-settings.h"
#include "KeccakF-1600-interface.h"

13
Modules/_sha3/sha3module.c
View file

@ -124,11 +124,14 @@
#define UseInterleaveTables
#endif
/* replacement for brg_endian.h
#define IS_BIG_ENDIAN BIG_ENDIAN
#define IS_LITTLE_ENDIAN LITTLE_ENDIAN
#define PLATFORM_BYTE_ORDER BYTE_ORDER
*/
/* replacement for brg_endian.h */
#define IS_BIG_ENDIAN 4321
#define IS_LITTLE_ENDIAN 1234
#if PY_BIG_ENDIAN
# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
#else
# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
#endif
/* inline all Keccak dependencies */
#include "keccak/KeccakNISTInterface.h"

21
Modules/_struct.c
View file

@ -1199,12 +1199,11 @@ whichtable(char **pfmt)
case '!': /* Network byte order is big-endian */
return bigendian_table;
case '=': { /* Host byte order -- different from native in alignment! */
int n = 1;
char *p = (char *) &n;
if (*p == 1)
return lilendian_table;
else
return bigendian_table;
#if PY_LITTLE_ENDIAN
return lilendian_table;
#else
return bigendian_table;
#endif
}
default:
--*pfmt; /* Back out of pointer increment */
@ -2088,13 +2087,13 @@ PyInit__struct(void)
/* Check endian and swap in faster functions */
{
int one = 1;
formatdef *native = native_table;
formatdef *other, *ptr;
if ((int)*(unsigned char*)&one)
other = lilendian_table;
else
other = bigendian_table;
#if PY_LITTLE_ENDIAN
other = lilendian_table;
#else
other = bigendian_table;
#endif
/* Scan through the native table, find a matching
entry in the endian table and swap in the
native implementations whenever possible

7
Modules/arraymodule.c
View file

@ -1664,11 +1664,8 @@ static const struct mformatdescr {
static enum machine_format_code
typecode_to_mformat_code(char typecode)
{
#ifdef WORDS_BIGENDIAN
const int is_big_endian = 1;
#else
const int is_big_endian = 0;
#endif
const int is_big_endian = PY_BIG_ENDIAN;
size_t intsize;
int is_signed;

22
Modules/sha256module.c
View file

@ -21,13 +21,6 @@
#include "hashlib.h"
/* Endianness testing and definitions */
#define TestEndianness(variable) {int i=1; variable=PCT_BIG_ENDIAN;\
if (*((char*)&i)==1) variable=PCT_LITTLE_ENDIAN;}
#define PCT_LITTLE_ENDIAN 1
#define PCT_BIG_ENDIAN 0
/* Some useful types */
typedef unsigned char SHA_BYTE;
@ -50,7 +43,6 @@ typedef struct {
SHA_INT32 digest[8]; /* Message digest */
SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
int Endianness;
int local; /* unprocessed amount in data */
int digestsize;
} SHAobject;
@ -58,13 +50,11 @@ typedef struct {
/* When run on a little-endian CPU we need to perform byte reversal on an
array of longwords. */
static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
#if PY_LITTLE_ENDIAN
static void longReverse(SHA_INT32 *buffer, int byteCount)
{
SHA_INT32 value;
if ( Endianness == PCT_BIG_ENDIAN )
return;
byteCount /= sizeof(*buffer);
while (byteCount--) {
value = *buffer;
@ -73,10 +63,10 @@ static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
*buffer++ = ( value << 16 ) | ( value >> 16 );
}
}
#endif
static void SHAcopy(SHAobject *src, SHAobject *dest)
{
dest->Endianness = src->Endianness;
dest->local = src->local;
dest->digestsize = src->digestsize;
dest->count_lo = src->count_lo;
@ -131,7 +121,9 @@ sha_transform(SHAobject *sha_info)
SHA_INT32 S[8], W[64], t0, t1;
memcpy(W, sha_info->data, sizeof(sha_info->data));
longReverse(W, (int)sizeof(sha_info->data), sha_info->Endianness);
#if PY_LITTLE_ENDIAN
longReverse(W, (int)sizeof(sha_info->data));
#endif
for (i = 16; i < 64; ++i) {
W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
@ -228,7 +220,6 @@ sha_transform(SHAobject *sha_info)
static void
sha_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = 0x6A09E667L;
sha_info->digest[1] = 0xBB67AE85L;
sha_info->digest[2] = 0x3C6EF372L;
@ -246,7 +237,6 @@ sha_init(SHAobject *sha_info)
static void
sha224_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = 0xc1059ed8L;
sha_info->digest[1] = 0x367cd507L;
sha_info->digest[2] = 0x3070dd17L;

22
Modules/sha512module.c
View file

@ -22,13 +22,6 @@
#ifdef PY_LONG_LONG /* If no PY_LONG_LONG, don't compile anything! */
/* Endianness testing and definitions */
#define TestEndianness(variable) {int i=1; variable=PCT_BIG_ENDIAN;\
if (*((char*)&i)==1) variable=PCT_LITTLE_ENDIAN;}
#define PCT_LITTLE_ENDIAN 1
#define PCT_BIG_ENDIAN 0
/* Some useful types */
typedef unsigned char SHA_BYTE;
@ -52,7 +45,6 @@ typedef struct {
SHA_INT64 digest[8]; /* Message digest */
SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
int Endianness;
int local; /* unprocessed amount in data */
int digestsize;
} SHAobject;
@ -60,13 +52,11 @@ typedef struct {
/* When run on a little-endian CPU we need to perform byte reversal on an
array of longwords. */
static void longReverse(SHA_INT64 *buffer, int byteCount, int Endianness)
#if PY_LITTLE_ENDIAN
static void longReverse(SHA_INT64 *buffer, int byteCount)
{
SHA_INT64 value;
if ( Endianness == PCT_BIG_ENDIAN )
return;
byteCount /= sizeof(*buffer);
while (byteCount--) {
value = *buffer;
@ -83,10 +73,10 @@ static void longReverse(SHA_INT64 *buffer, int byteCount, int Endianness)
buffer++;
}
}
#endif
static void SHAcopy(SHAobject *src, SHAobject *dest)
{
dest->Endianness = src->Endianness;
dest->local = src->local;
dest->digestsize = src->digestsize;
dest->count_lo = src->count_lo;
@ -141,7 +131,9 @@ sha512_transform(SHAobject *sha_info)
SHA_INT64 S[8], W[80], t0, t1;
memcpy(W, sha_info->data, sizeof(sha_info->data));
longReverse(W, (int)sizeof(sha_info->data), sha_info->Endianness);
#if PY_LITTLE_ENDIAN
longReverse(W, (int)sizeof(sha_info->data));
#endif
for (i = 16; i < 80; ++i) {
W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
@ -254,7 +246,6 @@ sha512_transform(SHAobject *sha_info)
static void
sha512_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = Py_ULL(0x6a09e667f3bcc908);
sha_info->digest[1] = Py_ULL(0xbb67ae8584caa73b);
sha_info->digest[2] = Py_ULL(0x3c6ef372fe94f82b);
@ -272,7 +263,6 @@ sha512_init(SHAobject *sha_info)
static void
sha384_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = Py_ULL(0xcbbb9d5dc1059ed8);
sha_info->digest[1] = Py_ULL(0x629a292a367cd507);
sha_info->digest[2] = Py_ULL(0x9159015a3070dd17);

8
Objects/longobject.c
View file

@ -988,7 +988,6 @@ PyLong_AsVoidPtr(PyObject *vv)
* rewritten to use the newer PyLong_{As,From}ByteArray API.
*/
#define IS_LITTLE_ENDIAN (int)*(unsigned char*)&one
#define PY_ABS_LLONG_MIN (0-(unsigned PY_LONG_LONG)PY_LLONG_MIN)
/* Create a new long int object from a C PY_LONG_LONG int. */
@ -1141,7 +1140,6 @@ PyLong_AsLongLong(PyObject *vv)
{
PyLongObject *v;
PY_LONG_LONG bytes;
int one = 1;
int res;
if (vv == NULL) {
@ -1176,7 +1174,7 @@ PyLong_AsLongLong(PyObject *vv)
case 1: return v->ob_digit[0];
}
res = _PyLong_AsByteArray((PyLongObject *)vv, (unsigned char *)&bytes,
SIZEOF_LONG_LONG, IS_LITTLE_ENDIAN, 1);
SIZEOF_LONG_LONG, PY_LITTLE_ENDIAN, 1);
/* Plan 9 can't handle PY_LONG_LONG in ? : expressions */
if (res < 0)
@ -1193,7 +1191,6 @@ PyLong_AsUnsignedLongLong(PyObject *vv)
{
PyLongObject *v;
unsigned PY_LONG_LONG bytes;
int one = 1;
int res;
if (vv == NULL) {
@ -1212,7 +1209,7 @@ PyLong_AsUnsignedLongLong(PyObject *vv)
}
res = _PyLong_AsByteArray((PyLongObject *)vv, (unsigned char *)&bytes,
SIZEOF_LONG_LONG, IS_LITTLE_ENDIAN, 0);
SIZEOF_LONG_LONG, PY_LITTLE_ENDIAN, 0);
/* Plan 9 can't handle PY_LONG_LONG in ? : expressions */
if (res < 0)
@ -1288,7 +1285,6 @@ PyLong_AsUnsignedLongLongMask(register PyObject *op)
return (unsigned PY_LONG_LONG)-1;
}
}
#undef IS_LITTLE_ENDIAN
/* Get a C long long int from a long int object or any object that has an
__int__ method.

6
Objects/stringlib/codecs.h
View file

@ -47,7 +47,7 @@ STRINGLIB(utf8_decode)(const char **inptr, const char *end,
unsigned long value = *(unsigned long *) _s;
if (value & ASCII_CHAR_MASK)
break;
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
_p[0] = (STRINGLIB_CHAR)(value & 0xFFu);
_p[1] = (STRINGLIB_CHAR)((value >> 8) & 0xFFu);
_p[2] = (STRINGLIB_CHAR)((value >> 16) & 0xFFu);
@ -454,7 +454,7 @@ STRINGLIB(utf16_decode)(const unsigned char **inptr, const unsigned char *e,
const unsigned char *q = *inptr;
STRINGLIB_CHAR *p = dest + *outpos;
/* Offsets from q for retrieving byte pairs in the right order. */
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
int ihi = !!native_ordering, ilo = !native_ordering;
#else
int ihi = !native_ordering, ilo = !!native_ordering;
@ -485,7 +485,7 @@ STRINGLIB(utf16_decode)(const unsigned char **inptr, const unsigned char *e,
block = SWAB(block);
#endif
}
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
# if SIZEOF_LONG == 4
p[0] = (STRINGLIB_CHAR)(block & 0xFFFFu);
p[1] = (STRINGLIB_CHAR)(block >> 16);

18
Objects/unicodeobject.c
View file

@ -47,14 +47,6 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include <windows.h>
#endif
/* Endianness switches; defaults to little endian */
#ifdef WORDS_BIGENDIAN
# define BYTEORDER_IS_BIG_ENDIAN
#else
# define BYTEORDER_IS_LITTLE_ENDIAN
#endif
/* --- Globals ------------------------------------------------------------
The globals are initialized by the _PyUnicode_Init() API and should
@ -4813,7 +4805,7 @@ PyUnicode_DecodeUTF32Stateful(const char *s,
int bo = 0; /* assume native ordering by default */
const char *errmsg = "";
/* Offsets from q for retrieving bytes in the right order. */
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
int iorder[] = {0, 1, 2, 3};
#else
int iorder[] = {3, 2, 1, 0};
@ -4835,7 +4827,7 @@ PyUnicode_DecodeUTF32Stateful(const char *s,
if (size >= 4) {
const Py_UCS4 bom = (q[iorder[3]] << 24) | (q[iorder[2]] << 16) |
(q[iorder[1]] << 8) | q[iorder[0]];
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
if (bom == 0x0000FEFF) {
q += 4;
bo = -1;
@ -4949,7 +4941,7 @@ _PyUnicode_EncodeUTF32(PyObject *str,
unsigned char *p;
Py_ssize_t nsize, i;
/* Offsets from p for storing byte pairs in the right order. */
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
int iorder[] = {0, 1, 2, 3};
#else
int iorder[] = {3, 2, 1, 0};
@ -5092,7 +5084,7 @@ PyUnicode_DecodeUTF16Stateful(const char *s,
return unicode_empty;
}
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
#if PY_LITTLE_ENDIAN
native_ordering = bo <= 0;
#else
native_ordering = bo >= 0;
@ -5209,7 +5201,7 @@ _PyUnicode_EncodeUTF16(PyObject *str,
unsigned short *out;
Py_ssize_t bytesize;
Py_ssize_t pairs;
#ifdef WORDS_BIGENDIAN
#if PY_BIG_ENDIAN
int native_ordering = byteorder >= 0;
#else
int native_ordering = byteorder <= 0;

21
Python/sysmodule.c
View file

@ -1561,7 +1561,6 @@ PyObject *
_PySys_Init(void)
{
PyObject *m, *v, *sysdict, *version_info;
char *s;
m = PyModule_Create(&sysmodule);
if (m == NULL)
@ -1638,20 +1637,14 @@ _PySys_Init(void)
PyLong_FromLong(0x10FFFF));
SET_SYS_FROM_STRING("builtin_module_names",
list_builtin_module_names());
{
/* Assumes that longs are at least 2 bytes long.
Should be safe! */
unsigned long number = 1;
char *value;
#if PY_BIG_ENDIAN
SET_SYS_FROM_STRING("byteorder",
PyUnicode_FromString("big"));
#else
SET_SYS_FROM_STRING("byteorder",
PyUnicode_FromString("little"));
#endif
s = (char *) &number;
if (s[0] == 0)
value = "big";
else
value = "little";
SET_SYS_FROM_STRING("byteorder",
PyUnicode_FromString(value));
}
#ifdef MS_COREDLL
SET_SYS_FROM_STRING("dllhandle",
PyLong_FromVoidPtr(PyWin_DLLhModule));