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annotate anagram/agcore/checksum.cpp @ 11:3aa0f5a02342

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Remove unused variable; fix what it was supposed to be doing. (and document it a bit for the next time through here)
author David A. Holland
date Tue, 31 May 2022 00:54:12 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1993-1999 Parsifal Software. All Rights Reserved.
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4 * Copyright 2006 David A. Holland. All Rights Reserved.
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5 * See the file COPYING for license and usage terms.
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6 *
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7 * checksum.cpp - self-checksum module
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8 */
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9
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10 #include <sys/types.h>
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11 #include <sys/stat.h>
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12 #include <fcntl.h>
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13 #include <limits.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include "port.h"
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18
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19 #ifdef AG_ON_WINDOWS
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20 #include <windows.h>
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21 #endif
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22
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23 #include "agstring.h"
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24 #include "assert.h"
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25 #include "checksum.h"
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26 #include "file.h"
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27
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28 //#define INCLUDE_LOGGING
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29 #include "log.h"
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30
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31
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32 /*
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33 * Fletcher's check-sum routines for AnaGram
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34 *
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35 * Freely adapted from routines published in Dr. Dobbs Journal
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36 * May 1992, p. 64
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37 */
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38
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39 #define BLOCK_SIZE 0X4000U
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40
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41 static AgString basedir;
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42
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43 static void checkSum(int fh, int offset, u_long *res_sum, u_long *res_len) {
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44 LOGSECTION("checkSum");
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45 char *buf;
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46 unsigned short k1, k2;
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47
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48 *res_sum = 0;
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49 *res_len = 0;
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50
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51 //LOGV(fh);
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52
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53 if (fh < 0) {
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54 return;
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55 }
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56 lseek(fh, 0, 2);
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57 int length = tell(fh);
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58 *res_len = length;
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59 //LOGV(length);
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60 //buf = ALLOCATE(BLOCK_SIZE + 1, char);
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61 buf = new char[BLOCK_SIZE + 1];
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62
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63 k1 = (unsigned short) (length >> 16);
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64 k2 = (unsigned short) length;
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65
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66 if (offset) {
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67 lseek(fh, offset+512, 0);
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68 length -= offset+512;
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69 //LOGV(length);
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70 }
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71 else {
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72 lseek(fh,0,0);
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73 }
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74
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75 if (k1 == 0) k1++;
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76 if (k2 == 0) k2++;
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77
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78 while (length > 0) {
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79 unsigned n;
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80 unsigned ni;
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81 unsigned i;
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82 unsigned short *b;
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83
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84 n = BLOCK_SIZE;
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85 if ((long) n > length) {
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86 n = (unsigned short) length;
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87 }
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88 n = read(fh, buf, n);
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89 if (n == 0) {
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90 break;
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91 }
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92 ni = (n+1)/2;
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93 i = 0;
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94 b = (unsigned short *) buf;
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95 buf[n] = 0;
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96 while (i< ni) {
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97 k1 += b[i];
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98 if (k1 < b[i]) {
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99 k1++;
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100 }
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101 k2 += k1;
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102 if (k2 < k1) {
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103 k2++;
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104 }
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105 i++;
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106 }
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107 length -= n;
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108 if (length <= 0 && offset!=0) {
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109 //LOGV(k1) LCV(k2);
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110 length = offset;
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111 offset = 0;
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112 lseek(fh, 0, 0);
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113 }
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114 }
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115 k1 ^= (unsigned short) -1;
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116 k2 ^= (unsigned short) -1;
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117 *res_sum = 65535L*k2 + k1;
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118
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119 LOGV(*res_sum);
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120 //DEALLOCATE(buf);
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121 delete [] buf;
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122 }
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123
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124 #ifdef AG_ON_WINDOWS
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125 static int open_binary(summable what) {
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126 char buf[_MAX_PATH];
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127 HMODULE module;
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128
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129 switch (what) {
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130 case SUM_AG1: module = GetModuleHandle("ag1"); break;
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131 case SUM_AG: module = 0; break;
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132 case SUM_AGCL: module = 0; break;
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133 }
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134
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135 GetModuleFileName(module, buf, sizeof(buf)-2);
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136
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137 if (what != SUM_AG1) {
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138 size_t len = strlen(buf);
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139 if (len >= 6 && !stricmp(buf+len-6, "ag.exe") && what == SUM_AGCL) {
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140 strcpy(buf+len-6, "agcl.exe");
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141 }
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142 else if (len >= 8 && !stricmp(buf+len-8, "agcl.exe") && what == SUM_AG) {
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143 strcpy(buf+len-8, "ag.exe");
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144 }
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145 }
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146
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147 return open_shared_denywrite(buf, O_BINARY|O_RDONLY);
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148 }
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149 #endif
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150
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151 #ifdef AG_ON_UNIX
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152 static int open_binary(summable what) {
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153 char buf[PATH_MAX];
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154 const char *name = NULL;
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155 switch (what) {
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156 case SUM_AG1: name = "ag1.so"; break;
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157 case SUM_AG: name = "ag"; break;
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158 case SUM_AGCL: name = "agcl"; break;
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159 }
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160
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161 snprintf(buf, sizeof(buf), "%s/%s", basedir.pointer(), name);
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162 return open(buf, O_RDONLY);
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163 }
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164 #endif
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165
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166 static int open_summable(summable what) {
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167 switch (what) {
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168 case SUM_AG1:
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169 case SUM_AG:
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170 case SUM_AGCL:
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171 return open_binary(what);
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172 }
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173 return -1;
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174 }
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175
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176 static void close_summable(summable what, int fd) {
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177 switch (what) {
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178 case SUM_AG1:
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179 case SUM_AG:
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180 case SUM_AGCL:
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181 close(fd);
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182 break;
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183 }
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184 }
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185
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186 void observeSum(sumentry *s) {
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187 LOGSECTION("observeSum");
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188
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189 int fd = open_summable(s->what);
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190 if (fd >= 0) {
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191 LOGV(fd);
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192 checkSum(fd, s->offset, &s->observed.sum, &s->observed.length);
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193 close_summable(s->what, fd);
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194 }
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195 else {
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196 s->observed.sum = 0;
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197 s->observed.length = 0;
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198 }
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199 }
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200
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201 void sum_remember_argv0(const char *argv0) {
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202 LOGSECTION("sum_remember_argv0");
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203 LOGV(argv0);
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204 AgString av0(argv0);
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205
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206 #ifdef AG_ON_WINDOWS
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207 basedir = av0.lastCut("\\/:").leftX();
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208 LOGV(basedir);
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209 #endif
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210
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211 #ifdef AG_ON_UNIX
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212 /*
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213 * Not as simple on Unix - we get whatever the parent process sends
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214 * us, which is typically what the user typed into the shell to
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215 * invoke the program. That is, it might be an absolute path, a
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216 * relative path, or no path at all, and in the latter case we need
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217 * to search $PATH. Blah.
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218 *
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219 * Note that since both argv[0] and $PATH are under the user's
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220 * control, if the user is adversarial we can't count on finding the
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221 * same file that we're actually executing from. Fortunately we
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222 * don't care about that now AG is open source.
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223 */
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224
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225 if (argv0[0]=='/') {
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226 /* absolute path */
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227 basedir = av0.lastCut("\\/:").leftX();
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228 LOGV(basedir);
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229 }
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230 else if (strrchr(argv0, '/')!=NULL) {
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231 /* relative path - good enough; we don't chdir before summing is done */
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232 basedir = av0.lastCut("\\/:").leftX();
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233 LOGV(basedir);
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234 }
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235 else {
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236 /* nothing */
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237 struct stat sb;
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238 const char *p = getenv("PATH");
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239 LOGV(p);
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240 if (p) {
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241 AgString path(p); // copy it
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242 for (char *s = strtok(path.pointer(), ":"); s; s = strtok(NULL, ":")) {
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243 char tmp[PATH_MAX];
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244 snprintf(tmp, sizeof(tmp), "%s/%s", s, argv0);
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245 LOGV(tmp);
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246 if (stat(tmp, &sb)==0) {
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247 basedir = s; // copy it
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248 LOGV(basedir);
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249 return;
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250 }
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251 }
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252 }
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253
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254 /* oh well - let's make a guess */
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255 basedir = "/usr/local/lib/anagram";
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256 LOGV(basedir);
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257 }
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258 #endif
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259 }