mercurial/bitmanipulation.h
author Matt Harbison <matt_harbison@yahoo.com>
Sat, 10 Dec 2022 14:57:42 -0500
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#ifndef HG_BITMANIPULATION_H
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#define HG_BITMANIPULATION_H
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#include <string.h>
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#include "compat.h"
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/* Reads a 64 bit integer from big-endian bytes. Assumes that the data is long
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 enough */
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static inline uint64_t getbe64(const char *c)
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{
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	const unsigned char *d = (const unsigned char *)c;
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	return ((((uint64_t)d[0]) << 56) | (((uint64_t)d[1]) << 48) |
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	        (((uint64_t)d[2]) << 40) | (((uint64_t)d[3]) << 32) |
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	        (((uint64_t)d[4]) << 24) | (((uint64_t)d[5]) << 16) |
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	        (((uint64_t)d[6]) << 8) | (d[7]));
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}
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static inline uint32_t getbe32(const char *c)
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{
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	const unsigned char *d = (const unsigned char *)c;
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	return ((((uint32_t)d[0]) << 24) | (((uint32_t)d[1]) << 16) |
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	        (((uint32_t)d[2]) << 8) | (d[3]));
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}
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static inline int16_t getbeint16(const char *c)
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{
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	const unsigned char *d = (const unsigned char *)c;
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	return ((d[0] << 8) | (d[1]));
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}
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static inline uint16_t getbeuint16(const char *c)
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{
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	const unsigned char *d = (const unsigned char *)c;
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	return ((d[0] << 8) | (d[1]));
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}
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/* Writes a 64 bit integer to bytes in a big-endian format.
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 Assumes that the buffer is long enough */
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static inline void putbe64(uint64_t x, char *c)
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{
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	c[0] = (x >> 56) & 0xff;
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	c[1] = (x >> 48) & 0xff;
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	c[2] = (x >> 40) & 0xff;
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	c[3] = (x >> 32) & 0xff;
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	c[4] = (x >> 24) & 0xff;
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	c[5] = (x >> 16) & 0xff;
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	c[6] = (x >> 8) & 0xff;
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	c[7] = (x)&0xff;
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}
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static inline void putbe32(uint32_t x, char *c)
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{
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	c[0] = (x >> 24) & 0xff;
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	c[1] = (x >> 16) & 0xff;
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	c[2] = (x >> 8) & 0xff;
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	c[3] = (x)&0xff;
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}
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static inline double getbefloat64(const char *c)
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{
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	const unsigned char *d = (const unsigned char *)c;
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	double ret;
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	int i;
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	uint64_t t = 0;
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	for (i = 0; i < 8; i++) {
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		t = (t << 8) + d[i];
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	}
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	memcpy(&ret, &t, sizeof(t));
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	return ret;
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}
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#endif