FreeTDS API
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bytes.h
1/* FreeTDS - Library of routines accessing Sybase and Microsoft databases
2 * Copyright (C) 2005-2008 Frediano Ziglio
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19
20#ifndef _tdsbytes_h_
21#define _tdsbytes_h_
22
23/*
24 * read a word of n bytes aligned, architecture dependent endian
25 * TDS_GET_An
26 * read a word of n bytes aligned, little endian
27 * TDS_GET_AnLE
28 * read a word of n bytes aligned, big endian
29 * TDS_GET_AnBE
30 * read a word of n bytes unaligned, architecture dependent endian
31 * TDS_GET_UAn
32 * read a word of n bytes unaligned, little endian
33 * TDS_GET_UAnLE
34 * read a word of n bytes unaligned, big endian
35 * TDS_GET_UAnBE
36 */
37
38/* one byte, easy... */
39#define TDS_GET_A1LE(ptr) (((uint8_t *)(ptr))[0])
40#define TDS_GET_A1BE(ptr) TDS_GET_A1LE(ptr)
41#define TDS_GET_UA1LE(ptr) TDS_GET_A1LE(ptr)
42#define TDS_GET_UA1BE(ptr) TDS_GET_A1LE(ptr)
43
44#define TDS_PUT_A1LE(ptr,val) do { ((uint8_t *)(ptr))[0] = (val); } while(0)
45#define TDS_PUT_A1BE(ptr,val) TDS_PUT_A1LE(ptr,val)
46#define TDS_PUT_UA1LE(ptr,val) TDS_PUT_A1LE(ptr,val)
47#define TDS_PUT_UA1BE(ptr,val) TDS_PUT_A1LE(ptr,val)
48
49/* two bytes */
50#define TDS_GET_UA2LE(ptr) (((uint8_t *)(ptr))[1] * 0x100u + ((uint8_t *)(ptr))[0])
51#define TDS_GET_UA2BE(ptr) (((uint8_t *)(ptr))[0] * 0x100u + ((uint8_t *)(ptr))[1])
52#define TDS_GET_A2LE(ptr) TDS_GET_UA2LE(ptr)
53#define TDS_GET_A2BE(ptr) TDS_GET_UA2BE(ptr)
54
55#define TDS_PUT_UA2LE(ptr,val) do {\
56 ((uint8_t *)(ptr))[1] = (uint8_t)((val)>>8); ((uint8_t *)(ptr))[0] = (uint8_t)(val); } while(0)
57#define TDS_PUT_UA2BE(ptr,val) do {\
58 ((uint8_t *)(ptr))[0] = (uint8_t)((val)>>8); ((uint8_t *)(ptr))[1] = (uint8_t)(val); } while(0)
59#define TDS_PUT_A2LE(ptr,val) TDS_PUT_UA2LE(ptr,val)
60#define TDS_PUT_A2BE(ptr,val) TDS_PUT_UA2BE(ptr,val)
61
62/* four bytes */
63#define TDS_GET_UA4LE(ptr) \
64 (((uint8_t *)(ptr))[3] * 0x1000000u + ((uint8_t *)(ptr))[2] * 0x10000u +\
65 ((uint8_t *)(ptr))[1] * 0x100u + ((uint8_t *)(ptr))[0])
66#define TDS_GET_UA4BE(ptr) \
67 (((uint8_t *)(ptr))[0] * 0x1000000u + ((uint8_t *)(ptr))[1] * 0x10000u +\
68 ((uint8_t *)(ptr))[2] * 0x100u + ((uint8_t *)(ptr))[3])
69#define TDS_GET_A4LE(ptr) TDS_GET_UA4LE(ptr)
70#define TDS_GET_A4BE(ptr) TDS_GET_UA4BE(ptr)
71
72#define TDS_PUT_UA4LE(ptr,val) do {\
73 ((uint8_t *)(ptr))[3] = (uint8_t)((val)>>24); ((uint8_t *)(ptr))[2] = (uint8_t)((val)>>16);\
74 ((uint8_t *)(ptr))[1] = (uint8_t)((val)>>8); ((uint8_t *)(ptr))[0] = (uint8_t)(val); } while(0)
75#define TDS_PUT_UA4BE(ptr,val) do {\
76 ((uint8_t *)(ptr))[0] = (uint8_t)((val)>>24); ((uint8_t *)(ptr))[1] = (uint8_t)((val)>>16);\
77 ((uint8_t *)(ptr))[2] = (uint8_t)((val)>>8); ((uint8_t *)(ptr))[3] = (uint8_t)(val); } while(0)
78#define TDS_PUT_A4LE(ptr,val) TDS_PUT_UA4LE(ptr,val)
79#define TDS_PUT_A4BE(ptr,val) TDS_PUT_UA4BE(ptr,val)
80
81#if defined(__GNUC__)
82# define TDS_MAY_ALIAS __attribute__((__may_alias__))
83#else
84# define TDS_MAY_ALIAS
85#endif
86
87typedef union {
88 uint16_t usi;
89 uint8_t uc[2];
90} TDS_MAY_ALIAS TDS_BYTE_CONVERT2;
91
92typedef union {
93 uint32_t ui;
94 uint8_t uc[4];
95} TDS_MAY_ALIAS TDS_BYTE_CONVERT4;
96
97/* architecture dependent */
98/* map to generic macros or redefine for aligned and same endianess */
99#ifdef WORDS_BIGENDIAN
100# define TDS_GET_A1(ptr) TDS_GET_A1BE(ptr)
101# define TDS_GET_UA1(ptr) TDS_GET_UA1BE(ptr)
102# define TDS_GET_A2(ptr) TDS_GET_A2BE(ptr)
103# define TDS_GET_UA2(ptr) TDS_GET_UA2BE(ptr)
104# define TDS_GET_A4(ptr) TDS_GET_A4BE(ptr)
105# define TDS_GET_UA4(ptr) TDS_GET_UA4BE(ptr)
106# undef TDS_GET_A2BE
107# undef TDS_GET_A4BE
108# define TDS_GET_A2BE(ptr) (((TDS_BYTE_CONVERT2*)(ptr))->usi)
109# define TDS_GET_A4BE(ptr) (((TDS_BYTE_CONVERT4*)(ptr))->ui)
110
111# define TDS_PUT_A1(ptr,val) TDS_PUT_A1BE(ptr,val)
112# define TDS_PUT_UA1(ptr,val) TDS_PUT_UA1BE(ptr,val)
113# define TDS_PUT_A2(ptr,val) TDS_PUT_A2BE(ptr,val)
114# define TDS_PUT_UA2(ptr,val) TDS_PUT_UA2BE(ptr,val)
115# define TDS_PUT_A4(ptr,val) TDS_PUT_A4BE(ptr,val)
116# define TDS_PUT_UA4(ptr,val) TDS_PUT_UA4BE(ptr,val)
117# undef TDS_PUT_A2BE
118# undef TDS_PUT_A4BE
119# define TDS_PUT_A2BE(ptr,val) (((TDS_BYTE_CONVERT2*)(ptr))->usi = (val))
120# define TDS_PUT_A4BE(ptr,val) (((TDS_BYTE_CONVERT4*)(ptr))->ui = (val))
121# define TDS_HOST2LE(val) TDS_BYTE_SWAP16(val)
122# define TDS_HOST4LE(val) TDS_BYTE_SWAP32(val)
123# define TDS_HOST2BE(val) (val)
124# define TDS_HOST4BE(val) (val)
125#else
126# define TDS_GET_A1(ptr) TDS_GET_A1LE(ptr)
127# define TDS_GET_UA1(ptr) TDS_GET_UA1LE(ptr)
128# define TDS_GET_A2(ptr) TDS_GET_A2LE(ptr)
129# define TDS_GET_UA2(ptr) TDS_GET_UA2LE(ptr)
130# define TDS_GET_A4(ptr) TDS_GET_A4LE(ptr)
131# define TDS_GET_UA4(ptr) TDS_GET_UA4LE(ptr)
132# undef TDS_GET_A2LE
133# undef TDS_GET_A4LE
134# define TDS_GET_A2LE(ptr) (((TDS_BYTE_CONVERT2*)(ptr))->usi)
135# define TDS_GET_A4LE(ptr) (((TDS_BYTE_CONVERT4*)(ptr))->ui)
136
137# define TDS_PUT_A1(ptr,val) TDS_PUT_A1LE(ptr,val)
138# define TDS_PUT_UA1(ptr,val) TDS_PUT_UA1LE(ptr,val)
139# define TDS_PUT_A2(ptr,val) TDS_PUT_A2LE(ptr,val)
140# define TDS_PUT_UA2(ptr,val) TDS_PUT_UA2LE(ptr,val)
141# define TDS_PUT_A4(ptr,val) TDS_PUT_A4LE(ptr,val)
142# define TDS_PUT_UA4(ptr,val) TDS_PUT_UA4LE(ptr,val)
143# undef TDS_PUT_A2LE
144# undef TDS_PUT_A4LE
145# define TDS_PUT_A2LE(ptr,val) (((TDS_BYTE_CONVERT2*)(ptr))->usi = (val))
146# define TDS_PUT_A4LE(ptr,val) (((TDS_BYTE_CONVERT4*)(ptr))->ui = (val))
147# define TDS_HOST2LE(val) (val)
148# define TDS_HOST4LE(val) (val)
149# define TDS_HOST2BE(val) TDS_BYTE_SWAP16(val)
150# define TDS_HOST4BE(val) TDS_BYTE_SWAP32(val)
151#endif
152
153/* these platform support unaligned fetch/store */
154/* map unaligned macro to aligned ones */
155#if defined(__i386__) || defined(__amd64__) || defined(__CRIS__) ||\
156 defined(__powerpc__) || defined(__powerpc64__) || defined(__ppc__) || defined(__ppc64__) ||\
157 defined(__s390__) || defined(__s390x__) || defined(__m68k__) ||\
158 (defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86) || defined(_M_X64))) ||\
159 defined(__ARM_FEATURE_UNALIGNED) ||\
160 defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) ||\
161 (defined(_M_ARM) && (_M_ARM >= 7))
162# ifdef WORDS_BIGENDIAN
163# undef TDS_GET_UA2BE
164# undef TDS_GET_UA4BE
165# define TDS_GET_UA2BE(ptr) TDS_GET_A2BE(ptr)
166# define TDS_GET_UA4BE(ptr) TDS_GET_A4BE(ptr)
167
168# undef TDS_PUT_UA2BE
169# undef TDS_PUT_UA4BE
170# define TDS_PUT_UA2BE(ptr,val) TDS_PUT_A2BE(ptr,val)
171# define TDS_PUT_UA4BE(ptr,val) TDS_PUT_A4BE(ptr,val)
172# else
173# undef TDS_GET_UA2LE
174# undef TDS_GET_UA4LE
175# define TDS_GET_UA2LE(ptr) TDS_GET_A2LE(ptr)
176# define TDS_GET_UA4LE(ptr) TDS_GET_A4LE(ptr)
177
178# undef TDS_PUT_UA2LE
179# undef TDS_PUT_UA4LE
180# define TDS_PUT_UA2LE(ptr,val) TDS_PUT_A2LE(ptr,val)
181# define TDS_PUT_UA4LE(ptr,val) TDS_PUT_A4LE(ptr,val)
182# endif
183#endif
184
185#undef TDS_BSWAP16
186#undef TDS_BSWAP32
187/* __builtin_bswap16 was introduced in GCC 4.8 */
188#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && defined(__OPTIMIZE__)
189# define TDS_BSWAP16(val) __builtin_bswap16(val)
190# define TDS_BSWAP32(val) __builtin_bswap32(val)
191/* __builtin_bswap32 was introduced in GCC 4.3 */
192#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && defined(__OPTIMIZE__)
193# define TDS_BSWAP32(val) __builtin_bswap32(val)
194#elif defined(_MSC_VER)
195# define TDS_BSWAP16(val) _byteswap_ushort(val)
196# define TDS_BSWAP32(val) _byteswap_ulong(val)
197#endif
198
199#if defined(TDS_BSWAP16) && !defined(WORDS_BIGENDIAN)
200# undef TDS_GET_UA2BE
201# define TDS_GET_UA2BE(ptr) TDS_BSWAP16(TDS_GET_UA2LE(ptr))
202
203# undef TDS_PUT_UA2BE
204# define TDS_PUT_UA2BE(ptr,val) do {\
205 uint16_t _tds_si = TDS_BSWAP16(val); TDS_PUT_UA2LE(ptr,_tds_si); } while(0)
206#elif defined(TDS_BSWAP16) && defined(WORDS_BIGENDIAN)
207# undef TDS_GET_UA2LE
208# define TDS_GET_UA2LE(ptr) TDS_BSWAP16(TDS_GET_UA2BE(ptr))
209
210# undef TDS_PUT_UA2LE
211# define TDS_PUT_UA2LE(ptr,val) do {\
212 uint16_t _tds_si = TDS_BSWAP16(val); TDS_PUT_UA2BE(ptr,_tds_si); } while(0)
213#endif
214
215#if defined(TDS_BSWAP32) && !defined(WORDS_BIGENDIAN)
216# undef TDS_GET_UA4BE
217# define TDS_GET_UA4BE(ptr) TDS_BSWAP32(TDS_GET_UA4LE(ptr))
218
219# undef TDS_PUT_UA4BE
220# define TDS_PUT_UA4BE(ptr,val) do {\
221 uint32_t _tds_i = TDS_BSWAP32(val); TDS_PUT_UA4LE(ptr,_tds_i); } while(0)
222#elif defined(TDS_BSWAP32) && defined(WORDS_BIGENDIAN)
223# undef TDS_GET_UA4LE
224# define TDS_GET_UA4LE(ptr) TDS_BSWAP32(TDS_GET_UA4BE(ptr))
225
226# undef TDS_PUT_UA4LE
227# define TDS_PUT_UA4LE(ptr,val) do {\
228 uint32_t _tds_i = TDS_BSWAP32(val); TDS_PUT_UA4BE(ptr,_tds_i); } while(0)
229#endif
230
231#if defined(__GNUC__) && defined(__powerpc__) && defined(WORDS_BIGENDIAN)
232# undef TDS_GET_UA2LE
233# undef TDS_GET_UA4LE
234static inline uint16_t
235TDS_GET_UA2LE(void *ptr)
236{
237 unsigned long res;
238 __asm__ ("lhbrx %0,0,%1\n" : "=r" (res) : "r" (ptr), "m"(*(uint16_t *)ptr));
239 return (uint16_t) res;
240}
241static inline uint32_t
242TDS_GET_UA4LE(void *ptr)
243{
244 unsigned long res;
245 __asm__ ("lwbrx %0,0,%1\n" : "=r" (res) : "r" (ptr), "m"(*(uint32_t *)ptr));
246 return (uint32_t) res;
247}
248
249# undef TDS_PUT_UA2LE
250# undef TDS_PUT_UA4LE
251static inline void
252TDS_PUT_UA2LE(void *ptr, unsigned data)
253{
254 __asm__ ("sthbrx %1,0,%2\n" : "=m" (*(uint16_t *)ptr) : "r" (data), "r" (ptr));
255}
256static inline void
257TDS_PUT_UA4LE(void *ptr, unsigned data)
258{
259 __asm__ ("stwbrx %1,0,%2\n" : "=m" (*(uint32_t *)ptr) : "r" (data), "r" (ptr));
260}
261#endif
262
263#endif
TDS_MAY_ALIAS
Definition bytes.h:87
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