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8215
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 uintptr_t
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14 ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value)
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15 {
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16 if (value <= 63) {
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17 if (p == NULL) {
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18 return 1;
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19 }
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20
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21 *p++ = value;
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22 return (uintptr_t) p;
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23 }
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24
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25 if (value <= 16383) {
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26 if (p == NULL) {
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27 return 2;
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28 }
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29
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30 *p++ = 0x40 | (value >> 8);
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31 *p++ = value;
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32 return (uintptr_t) p;
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33 }
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34
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35 if (value <= 1073741823) {
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36 if (p == NULL) {
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37 return 3;
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38 }
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39
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40 *p++ = 0x80 | (value >> 16);
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41 *p++ = (value >> 8);
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42 *p++ = value;
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43 return (uintptr_t) p;
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44
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45 }
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46
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47 if (p == NULL) {
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48 return 4;
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49 }
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50
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51 *p++ = 0xc0 | (value >> 24);
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52 *p++ = (value >> 16);
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53 *p++ = (value >> 8);
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54 *p++ = value;
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55 return (uintptr_t) p;
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56 }
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57
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58
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59 uintptr_t
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60 ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
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61 {
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62 ngx_uint_t thresh, n;
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63
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64 thresh = (1 << prefix) - 1;
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65
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66 if (value < thresh) {
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67 if (p == NULL) {
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68 return 1;
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69 }
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70
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71 *p++ |= value;
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72 return (uintptr_t) p;
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73 }
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74
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75 value -= thresh;
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76
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77 for (n = 10; n > 1; n--) {
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78 if (value >> (7 * (n - 1))) {
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79 break;
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80 }
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81 }
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82
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83 if (p == NULL) {
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84 return n + 1;
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85 }
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86
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87 *p++ |= thresh;
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88
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89 for ( /* void */ ; n > 1; n--) {
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90 *p++ = 0x80 | (value >> 7 * (n - 1));
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91 }
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92
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93 *p++ = value & 0x7f;
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94
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95 return (uintptr_t) p;
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96 }
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