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annotate zlib/adler32.c @ 2690:9ef72ee5c0b0

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Update vendored zlib to 1.3.1
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 Jun 2025 15:39:33 -0700
parents 00d788dac91a
children
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1 /* adler32.c -- compute the Adler-32 checksum of a data stream
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2 * Copyright (C) 1995-2011, 2016 Mark Adler
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 /* @(#) $Id$ */
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7
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8 #include "zutil.h"
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9
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10 #define BASE 65521U /* largest prime smaller than 65536 */
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11 #define NMAX 5552
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12 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
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13
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14 #define DO1(buf,i) {adler += (buf)[i]; sum2 += adler;}
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15 #define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);
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16 #define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);
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17 #define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);
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18 #define DO16(buf) DO8(buf,0); DO8(buf,8);
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19
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20 /* use NO_DIVIDE if your processor does not do division in hardware --
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21 try it both ways to see which is faster */
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22 #ifdef NO_DIVIDE
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23 /* note that this assumes BASE is 65521, where 65536 % 65521 == 15
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24 (thank you to John Reiser for pointing this out) */
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25 # define CHOP(a) \
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26 do { \
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27 unsigned long tmp = a >> 16; \
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28 a &= 0xffffUL; \
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29 a += (tmp << 4) - tmp; \
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30 } while (0)
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31 # define MOD28(a) \
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32 do { \
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33 CHOP(a); \
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34 if (a >= BASE) a -= BASE; \
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35 } while (0)
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36 # define MOD(a) \
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37 do { \
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38 CHOP(a); \
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39 MOD28(a); \
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40 } while (0)
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41 # define MOD63(a) \
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42 do { /* this assumes a is not negative */ \
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43 z_off64_t tmp = a >> 32; \
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44 a &= 0xffffffffL; \
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45 a += (tmp << 8) - (tmp << 5) + tmp; \
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46 tmp = a >> 16; \
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47 a &= 0xffffL; \
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48 a += (tmp << 4) - tmp; \
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49 tmp = a >> 16; \
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50 a &= 0xffffL; \
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51 a += (tmp << 4) - tmp; \
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52 if (a >= BASE) a -= BASE; \
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53 } while (0)
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54 #else
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55 # define MOD(a) a %= BASE
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56 # define MOD28(a) a %= BASE
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57 # define MOD63(a) a %= BASE
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58 #endif
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59
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60 /* ========================================================================= */
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61 uLong ZEXPORT adler32_z(uLong adler, const Bytef *buf, z_size_t len) {
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62 unsigned long sum2;
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63 unsigned n;
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64
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65 /* split Adler-32 into component sums */
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66 sum2 = (adler >> 16) & 0xffff;
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67 adler &= 0xffff;
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68
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69 /* in case user likes doing a byte at a time, keep it fast */
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70 if (len == 1) {
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71 adler += buf[0];
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72 if (adler >= BASE)
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73 adler -= BASE;
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74 sum2 += adler;
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75 if (sum2 >= BASE)
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76 sum2 -= BASE;
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77 return adler | (sum2 << 16);
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78 }
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79
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80 /* initial Adler-32 value (deferred check for len == 1 speed) */
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81 if (buf == Z_NULL)
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82 return 1L;
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83
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84 /* in case short lengths are provided, keep it somewhat fast */
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85 if (len < 16) {
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86 while (len--) {
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87 adler += *buf++;
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88 sum2 += adler;
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89 }
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90 if (adler >= BASE)
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91 adler -= BASE;
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92 MOD28(sum2); /* only added so many BASE's */
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93 return adler | (sum2 << 16);
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94 }
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95
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96 /* do length NMAX blocks -- requires just one modulo operation */
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97 while (len >= NMAX) {
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98 len -= NMAX;
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99 n = NMAX / 16; /* NMAX is divisible by 16 */
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100 do {
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101 DO16(buf); /* 16 sums unrolled */
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102 buf += 16;
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103 } while (--n);
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104 MOD(adler);
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105 MOD(sum2);
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106 }
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107
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108 /* do remaining bytes (less than NMAX, still just one modulo) */
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109 if (len) { /* avoid modulos if none remaining */
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110 while (len >= 16) {
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111 len -= 16;
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112 DO16(buf);
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113 buf += 16;
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114 }
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115 while (len--) {
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116 adler += *buf++;
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117 sum2 += adler;
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118 }
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119 MOD(adler);
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120 MOD(sum2);
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121 }
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122
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123 /* return recombined sums */
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124 return adler | (sum2 << 16);
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125 }
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126
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127 /* ========================================================================= */
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128 uLong ZEXPORT adler32(uLong adler, const Bytef *buf, uInt len) {
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129 return adler32_z(adler, buf, len);
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130 }
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131
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132 /* ========================================================================= */
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133 local uLong adler32_combine_(uLong adler1, uLong adler2, z_off64_t len2) {
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134 unsigned long sum1;
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135 unsigned long sum2;
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136 unsigned rem;
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137
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138 /* for negative len, return invalid adler32 as a clue for debugging */
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139 if (len2 < 0)
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140 return 0xffffffffUL;
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141
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142 /* the derivation of this formula is left as an exercise for the reader */
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143 MOD63(len2); /* assumes len2 >= 0 */
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144 rem = (unsigned)len2;
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145 sum1 = adler1 & 0xffff;
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146 sum2 = rem * sum1;
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147 MOD(sum2);
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148 sum1 += (adler2 & 0xffff) + BASE - 1;
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149 sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
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150 if (sum1 >= BASE) sum1 -= BASE;
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151 if (sum1 >= BASE) sum1 -= BASE;
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152 if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
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153 if (sum2 >= BASE) sum2 -= BASE;
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154 return sum1 | (sum2 << 16);
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155 }
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156
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157 /* ========================================================================= */
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158 uLong ZEXPORT adler32_combine(uLong adler1, uLong adler2, z_off_t len2) {
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159 return adler32_combine_(adler1, adler2, len2);
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160 }
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161
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162 uLong ZEXPORT adler32_combine64(uLong adler1, uLong adler2, z_off64_t len2) {
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163 return adler32_combine_(adler1, adler2, len2);
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164 }