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annotate checksum/checksum.c @ 3:e23ad76d0588

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Document the LaTeX packages used in the install notes.
author David A. Holland
date Sun, 26 Apr 2009 18:23:33 -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 2006 David A. Holland. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 */
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6
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7 /*
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8 * checksum - compute checksums of key files.
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9 * usage: checksum outputprefix symbolic-name filename
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10 *
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11 * Outputs to two files, one with the checksum info and one
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12 * the control file for insertsums.
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13 *
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14 * In each binary searches for a sums patch area, which is a
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15 * region of size TARGETSIZE beginning with the string TARGETLABEL.
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16 * This region is excluded from the sum and reported to insertsums.
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17 *
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18 * XXX the definitions of TARGETSIZE and TARGETLABEL should be shared
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19 * with the ag code.
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20 *
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21 * This module is new code as of June 2006 and should be much more
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22 * portable than the old stuff.
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23 */
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24
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25 #include <sys/types.h>
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26 #include <sys/stat.h>
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27 #include <stdio.h>
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28 #include <stdarg.h>
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29 #include <stdint.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <assert.h>
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33 #include <unistd.h>
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34 #include <fcntl.h>
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35 #include <getopt.h>
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36 #include <errno.h>
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37
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38 #include "bits.h"
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39
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40 #ifndef O_BINARY
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41 #define O_BINARY 0
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42 #define O_TEXT 0
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43 #endif
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44
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45 #define TARGETSIZE 512
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46 #define TARGETLABEL "Checksum data:\n"
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47
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48 static FILE *datfile, *ctlfile;
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49
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50 #if 0
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51 /* The file extensions depend on the platform we're building for. */
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52 typedef enum {
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53 EXEEXT,
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54 SHLIBEXT,
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55 HLPEXT,
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56 } whichext;
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57
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58 /* Information about files we checksum. */
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59 struct fileinfo {
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60 const char *basename;
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61 whichext ext;
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62 int istarget;
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63 const char *tag;
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64 };
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65
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66 /* These are the files. */
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67 static const struct fileinfo files[] = {
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68 { "ag", EXEEXT, 0, "ag" },
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69 { "agcl", EXEEXT, 0, "agcl" },
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70 { "ag1", SHLIBEXT, 1, "ag1" },
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71 { "AnaGram", HLPEXT, 0, "hlp" },
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72 };
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73 static const unsigned numfiles = sizeof(files) / sizeof(files[0]);
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74 #endif
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75
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76 /* The name of this program, from argv[0]. */
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77 static const char *me;
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78
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79 ////////////////////////////////////////////////////////////
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80
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81 static off_t filelength(int fd) {
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82 struct stat statbuf;
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83 fstat(fd, &statbuf);
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84 return statbuf.st_size;
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85 }
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86
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87 static void setme(const char *av0) {
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88 me = strrchr(av0, '/');
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89 if (me) {
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90 me++;
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91 }
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92 else {
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93 me = av0;
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94 }
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95 }
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96
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97 static void die(const char *fmt, ...) {
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98 va_list ap;
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99 fprintf(stderr, "%s: ", me);
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100 va_start(ap, fmt);
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101 vfprintf(stderr, fmt, ap);
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102 fputc('\n', stderr);
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103 exit(EXIT_FAILURE);
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104 }
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105
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106 ////////////////////////////////////////////////////////////
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107
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108 static void openoutput(const char *prefix) {
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109 char buf[128];
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110
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111 snprintf(buf, sizeof(buf), "%s.dat", prefix);
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112 datfile = fopen(buf, "at");
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113 if (!datfile) {
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114 die("%s: fopen failed", buf);
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115 }
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116
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117 snprintf(buf, sizeof(buf), "%s.ctl", prefix);
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118 ctlfile = fopen(buf, "at");
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119 if (!ctlfile) {
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120 die("%s: fopen failed", buf);
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121 }
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122 }
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123
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124 static void closeoutput(void) {
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125 fclose(datfile);
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126 fclose(ctlfile);
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127 }
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128
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129 ////////////////////////////////////////////////////////////
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130
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131 /*
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132 * Note: allocates a zero byte after the end of the file
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133 * (the checksum code demands this)
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134 */
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135 static char *loadfile(const char *path, size_t *len_ret) {
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136 int fd;
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137 char *buf;
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138 off_t length;
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139 ssize_t nread;
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140
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141 fd = open(path, O_BINARY|O_RDONLY);
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142 if (fd < 0) {
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143 die("%s: %s", path, strerror(errno));
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144 }
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145
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146 length = filelength(fd);
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147 if (length > 1000000000L) {
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148 // paranoia is good
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149 die("Unreasonably large file");
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150 }
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151
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152 buf = malloc(length+1);
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153 if (!buf) {
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154 die("malloc failed");
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155 }
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156
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157 nread = read(fd, buf, length);
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158 if (nread < 0) {
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159 die("%s: read: %s", path, strerror(errno));
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160 }
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161 if (nread != length) {
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162 die("%s: read: short count", path);
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163 }
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164
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165 close(fd);
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166
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167 buf[length] = 0;
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168
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169 *len_ret = length;
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170 return buf;
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171 }
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172
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173 static void unloadfile(char *buf) {
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174 free(buf);
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175 }
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176
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177 ////////////////////////////////////////////////////////////
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178
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179 static int search(const char *data, size_t len, size_t *pos_ret) {
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180 static const char tag[] = TARGETLABEL;
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181 static unsigned expected = 0;
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182 static size_t start = 0;
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183
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184 size_t pos = 0;
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185
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186 for (pos=0; pos<len; pos++) {
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187 int ch = data[pos];
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188
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189 if (ch == tag[expected]) {
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190 if (expected==0) {
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191 start = pos;
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192 }
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193 expected++;
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194 if (tag[expected]==0) {
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195 /* found */
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196 *pos_ret = start;
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197 return 1;
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198 }
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199 }
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200 else {
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201 expected = 0;
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202 }
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203 }
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204
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205 return 0;
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206 }
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207
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208 ////////////////////////////////////////////////////////////
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209
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210 static void sumfile(const char *sym, const char *path) {
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211 char *data;
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212 uint32_t sum;
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213 size_t length, patchpos;
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214 int haspatcharea;
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215
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216 data = loadfile(path, &length);
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217 haspatcharea = search(data, length, &patchpos);
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218 sum = dosum(data, length, haspatcharea ? patchpos : 0, TARGETSIZE);
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219 unloadfile(data);
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220
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221 if (haspatcharea && patchpos==0) {
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222 die("%s: patch area is at file offset 0", path);
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223 }
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224
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225 fprintf(datfile, "%s=%lu,%lu",
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226 sym, (unsigned long) length, (unsigned long) sum);
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227 if (haspatcharea) {
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228 fprintf(datfile, "@%lu", (unsigned long) patchpos);
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229 fprintf(ctlfile, "%s %lu\n", path, (unsigned long) patchpos);
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230 }
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231 else {
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232 fprintf(ctlfile, "# %s no-patch-area\n", path);
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233 }
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234 fprintf(datfile, "\n");
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235 }
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236
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237 ////////////////////////////////////////////////////////////
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238
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239 static void usage(void) {
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240 die("Usage: %s outputprefix symbolic-name pathname", me);
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241 }
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242
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243 int main(int argc, char *argv[]) {
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244 const char *out, *sym, *path;
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245
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246 setme(argv[0]);
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247 if (argc != 4) {
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248 usage();
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249 }
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250
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251 out = argv[1];
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252 sym = argv[2];
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253 path = argv[3];
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254
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255 openoutput(out);
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256 sumfile(sym, path);
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257 closeoutput();
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258
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259 return EXIT_SUCCESS;
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260 }