Mercurial > hg
annotate mercurial/bitmanipulation.h @ 50896:b2b8c25f9462
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author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 30 Aug 2023 13:28:09 +0200 |
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1 #ifndef HG_BITMANIPULATION_H |
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2 #define HG_BITMANIPULATION_H |
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3 |
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4 #include <string.h> |
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5 |
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6 #include "compat.h" |
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7 |
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8 /* Reads a 64 bit integer from big-endian bytes. Assumes that the data is long |
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9 enough */ |
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10 static inline uint64_t getbe64(const char *c) |
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11 { |
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12 const unsigned char *d = (const unsigned char *)c; |
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13 |
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14 return ((((uint64_t)d[0]) << 56) | (((uint64_t)d[1]) << 48) | |
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15 (((uint64_t)d[2]) << 40) | (((uint64_t)d[3]) << 32) | |
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16 (((uint64_t)d[4]) << 24) | (((uint64_t)d[5]) << 16) | |
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17 (((uint64_t)d[6]) << 8) | (d[7])); |
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18 } |
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19 |
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20 static inline uint32_t getbe32(const char *c) |
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21 { |
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22 const unsigned char *d = (const unsigned char *)c; |
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23 |
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24 return ((((uint32_t)d[0]) << 24) | (((uint32_t)d[1]) << 16) | |
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25 (((uint32_t)d[2]) << 8) | (d[3])); |
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26 } |
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27 |
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28 static inline int16_t getbeint16(const char *c) |
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29 { |
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30 const unsigned char *d = (const unsigned char *)c; |
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31 |
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32 return ((d[0] << 8) | (d[1])); |
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33 } |
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34 |
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35 static inline uint16_t getbeuint16(const char *c) |
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36 { |
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37 const unsigned char *d = (const unsigned char *)c; |
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38 |
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39 return ((d[0] << 8) | (d[1])); |
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40 } |
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41 |
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42 /* Writes a 64 bit integer to bytes in a big-endian format. |
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43 Assumes that the buffer is long enough */ |
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44 static inline void putbe64(uint64_t x, char *c) |
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45 { |
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46 c[0] = (x >> 56) & 0xff; |
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47 c[1] = (x >> 48) & 0xff; |
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48 c[2] = (x >> 40) & 0xff; |
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49 c[3] = (x >> 32) & 0xff; |
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50 c[4] = (x >> 24) & 0xff; |
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51 c[5] = (x >> 16) & 0xff; |
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52 c[6] = (x >> 8) & 0xff; |
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53 c[7] = (x)&0xff; |
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54 } |
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55 |
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56 static inline void putbe32(uint32_t x, char *c) |
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57 { |
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58 c[0] = (x >> 24) & 0xff; |
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59 c[1] = (x >> 16) & 0xff; |
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60 c[2] = (x >> 8) & 0xff; |
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61 c[3] = (x)&0xff; |
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62 } |
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63 |
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64 static inline double getbefloat64(const char *c) |
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65 { |
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66 const unsigned char *d = (const unsigned char *)c; |
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67 double ret; |
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68 int i; |
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69 uint64_t t = 0; |
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70 for (i = 0; i < 8; i++) { |
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71 t = (t << 8) + d[i]; |
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72 } |
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73 memcpy(&ret, &t, sizeof(t)); |
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74 return ret; |
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75 } |
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76 |
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77 #endif |