author | Matt Harbison <matt_harbison@yahoo.com> |
Thu, 25 Jul 2024 15:56:04 -0400 | |
changeset 51734 | f1aeca014d80 |
parent 48274 | d86908050375 |
permissions | -rw-r--r-- |
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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 |