1/* chunkset.c -- inline functions to copy small data chunks.
2 * For conditions of distribution and use, see copyright notice in zlib.h
3 */
4
5#include "zbuild.h"
6#include "zutil.h"
7
8// We need sizeof(chunk_t) to be 8, no matter what.
9#if defined(UNALIGNED64_OK)
10typedef uint64_t chunk_t;
11#elif defined(UNALIGNED_OK)
12typedef struct chunk_t { uint32_t u32[2]; } chunk_t;
13#else
14typedef struct chunk_t { uint8_t u8[8]; } chunk_t;
15#endif
16
17#define CHUNK_SIZE 8
18
19#define HAVE_CHUNKMEMSET_1
20#define HAVE_CHUNKMEMSET_4
21#define HAVE_CHUNKMEMSET_8
22
23static inline void chunkmemset_1(uint8_t *from, chunk_t *chunk) {
24#if defined(UNALIGNED64_OK)
25 *chunk = 0x0101010101010101 * (uint8_t)*from;
26#elif defined(UNALIGNED_OK)
27 chunk->u32[0] = 0x01010101 * (uint8_t)*from;
28 chunk->u32[1] = chunk->u32[0];
29#else
30 memset(chunk, *from, sizeof(chunk_t));
31#endif
32}
33
34static inline void chunkmemset_4(uint8_t *from, chunk_t *chunk) {
35#if defined(UNALIGNED64_OK)
36 uint32_t half_chunk;
37 half_chunk = *(uint32_t *)from;
38 *chunk = 0x0000000100000001 * (uint64_t)half_chunk;
39#elif defined(UNALIGNED_OK)
40 chunk->u32[0] = *(uint32_t *)from;
41 chunk->u32[1] = chunk->u32[0];
42#else
43 uint8_t *chunkptr = (uint8_t *)chunk;
44 memcpy(chunkptr, from, 4);
45 memcpy(chunkptr+4, from, 4);
46#endif
47}
48
49static inline void chunkmemset_8(uint8_t *from, chunk_t *chunk) {
50#if defined(UNALIGNED64_OK)
51 *chunk = *(uint64_t *)from;
52#elif defined(UNALIGNED_OK)
53 uint32_t* p = (uint32_t *)from;
54 chunk->u32[0] = p[0];
55 chunk->u32[1] = p[1];
56#else
57 memcpy(chunk, from, sizeof(chunk_t));
58#endif
59}
60
61static inline void loadchunk(uint8_t const *s, chunk_t *chunk) {
62 chunkmemset_8(from: (uint8_t *)s, chunk);
63}
64
65static inline void storechunk(uint8_t *out, chunk_t *chunk) {
66#if defined(UNALIGNED64_OK)
67 *(uint64_t *)out = *chunk;
68#elif defined(UNALIGNED_OK)
69 ((uint32_t *)out)[0] = chunk->u32[0];
70 ((uint32_t *)out)[1] = chunk->u32[1];
71#else
72 memcpy(out, chunk, sizeof(chunk_t));
73#endif
74}
75
76#define CHUNKSIZE chunksize_c
77#define CHUNKCOPY chunkcopy_c
78#define CHUNKCOPY_SAFE chunkcopy_safe_c
79#define CHUNKUNROLL chunkunroll_c
80#define CHUNKMEMSET chunkmemset_c
81#define CHUNKMEMSET_SAFE chunkmemset_safe_c
82
83#include "chunkset_tpl.h"
84