mirror of
https://github.com/GerbilSoft/zlib-ng.git
synced 2025-06-18 19:45:37 -04:00
9107e2b202
Requires some mild trickery to walk the edge between readability and doing what it needs to.
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* chunkset.c -- inline functions to copy small data chunks.
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include "zbuild.h"
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#include "zutil.h"
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// We need sizeof(chunk_t) to be 8, no matter what.
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#if defined(UNALIGNED64_OK)
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typedef uint64_t chunk_t;
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#elif defined(UNALIGNED_OK)
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typedef struct chunk_t { uint32_t u32[2]; } chunk_t;
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#else
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typedef struct chunk_t { uint8_t u8[8]; } chunk_t;
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#endif
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#define HAVE_CHUNKMEMSET_1
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#define HAVE_CHUNKMEMSET_4
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#define HAVE_CHUNKMEMSET_8
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static inline void chunkmemset_1(uint8_t *from, chunk_t *chunk) {
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#if defined(UNALIGNED64_OK)
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*chunk = 0x0101010101010101 * (uint8_t)*from;
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#elif defined(UNALIGNED_OK)
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chunk->u32[0] = 0x01010101 * (uint8_t)*from;
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chunk->u32[1] = chunk->u32[0];
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#else
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memset(chunk, *from, sizeof(chunk_t));
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#endif
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}
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static inline void chunkmemset_4(uint8_t *from, chunk_t *chunk) {
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#if defined(UNALIGNED64_OK)
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uint32_t half_chunk;
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half_chunk = *(uint32_t *)from;
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*chunk = 0x0000000100000001 * (uint64_t)half_chunk;
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#elif defined(UNALIGNED_OK)
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chunk->u32[0] = *(uint32_t *)from;
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chunk->u32[1] = chunk->u32[0];
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#else
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uint8_t *chunkptr = (uint8_t *)chunk;
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memcpy(chunkptr, from, 4);
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memcpy(chunkptr+4, from, 4);
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#endif
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}
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static inline void chunkmemset_8(uint8_t *from, chunk_t *chunk) {
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#if defined(UNALIGNED64_OK)
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*chunk = *(uint64_t *)from;
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#elif defined(UNALIGNED_OK)
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uint32_t* p = (uint32_t *)from;
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chunk->u32[0] = p[0];
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chunk->u32[1] = p[1];
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#else
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memcpy(chunk, from, sizeof(chunk_t));
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#endif
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}
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static inline void loadchunk(uint8_t const *s, chunk_t *chunk) {
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chunkmemset_8((uint8_t *)s, chunk);
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}
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static inline void storechunk(uint8_t *out, chunk_t *chunk) {
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#if defined(UNALIGNED64_OK)
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*(uint64_t *)out = *chunk;
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#elif defined(UNALIGNED_OK)
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((uint32_t *)out)[0] = chunk->u32[0];
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((uint32_t *)out)[1] = chunk->u32[1];
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#else
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memcpy(out, chunk, sizeof(chunk_t));
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#endif
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}
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#define CHUNKSIZE chunksize_c
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#define CHUNKCOPY chunkcopy_c
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#define CHUNKCOPY_SAFE chunkcopy_safe_c
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#define CHUNKUNROLL chunkunroll_c
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#define CHUNKMEMSET chunkmemset_c
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#define CHUNKMEMSET_SAFE chunkmemset_safe_c
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#include "chunkset_tpl.h"
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