author | Andrey Skvortsov <andrej.skvortzov@gmail.com> |
Thu, 16 Aug 2018 10:53:54 +0300 | |
changeset 2287 | f09f31602ba6 |
parent 2227 | f150783ee8e7 |
child 2499 | 68f4f2d4516b |
permissions | -rw-r--r-- |
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/* |
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This file is part of Beremiz, a Integrated Development Environment for |
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programming IEC 61131-3 automates supporting plcopen standard and CanFestival. |
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See COPYING.runtime |
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Copyright (C) 2018: Sergey Surkov <surkov.sv@summatechnology.ru> |
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Copyright (C) 2018: Andrey Skvortsov <andrej.skvortzov@gmail.com> |
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*/ |
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#ifndef HAVE_RETAIN |
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#include <stdio.h> |
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#include <stdint.h> |
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#include <unistd.h> |
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#include "iec_types.h" |
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int GetRetainSize(void); |
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/* Retain buffer. */ |
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FILE *retain_buffer; |
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const char rb_file[] = "retain_buffer_file"; |
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const char rb_file_bckp[] = "retain_buffer_file.bak"; |
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/* Retain header struct. */ |
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struct retain_info_t { |
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uint32_t retain_size; |
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uint32_t hash_size; |
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uint8_t* hash; |
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uint32_t header_offset; |
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uint32_t header_crc; |
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}; |
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/* Init retain info structure. */ |
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struct retain_info_t retain_info; |
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/* CRC lookup table and initial state. */ |
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uint32_t crc32_table[256]; |
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uint32_t retain_crc; |
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/* Generate CRC32 lookup table. */ |
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void GenerateCRC32Table(void) |
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{ |
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unsigned int i, j; |
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/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */ |
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uint32_t poly = 0xEDB88320; |
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for (i = 0; i <= 0xFF; i++) |
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{ |
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uint32_t c = i; |
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for (j = 0 ; j < 8 ; j++) |
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c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1); |
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crc32_table[i] = c; |
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} |
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} |
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/* Calculate CRC32 for len bytes from pointer buf with init starting value. */ |
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uint32_t GenerateCRC32Sum(const void* buf, unsigned int len, uint32_t init) |
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{ |
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uint32_t crc = ~init; |
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unsigned char* current = (unsigned char*) buf; |
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while (len--) |
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crc = crc32_table[(crc ^ *current++) & 0xFF] ^ (crc >> 8); |
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return ~crc; |
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} |
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/* Calc CRC32 for retain file byte by byte. */ |
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int CheckFileCRC(FILE* file_buffer) |
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{ |
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/* Set the magic constant for one-pass CRC calc according to ZIP CRC32. */ |
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const uint32_t magic_number = 0x2144df1c; |
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/* CRC initial state. */ |
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uint32_t calc_crc32 = 0; |
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char data_block = 0; |
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while(!feof(file_buffer)){ |
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if (fread(&data_block, sizeof(data_block), 1, file_buffer)) |
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calc_crc32 = GenerateCRC32Sum(&data_block, sizeof(data_block), calc_crc32); |
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} |
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/* Compare crc result with a magic number. */ |
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return (calc_crc32 == magic_number) ? 1 : 0; |
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} |
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/* Compare current hash with hash from file byte by byte. */ |
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int CheckFilehash(void) |
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{ |
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unsigned int k; |
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int offset = sizeof(retain_info.retain_size); |
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rewind(retain_buffer); |
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fseek(retain_buffer, offset , SEEK_SET); |
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uint32_t size; |
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fread(&size, sizeof(size), 1, retain_buffer); |
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if (size != retain_info.hash_size) |
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return 0; |
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for(k = 0; k < retain_info.hash_size; k++){ |
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uint8_t file_digit; |
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fread(&file_digit, sizeof(file_digit), 1, retain_buffer); |
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if (file_digit != *(retain_info.hash+k)) |
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return 0; |
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108 |
} |
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110 |
return 1; |
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111 |
} |
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112 |
|
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113 |
void InitRetain(void) |
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114 |
{ |
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115 |
unsigned int i; |
2174
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116 |
|
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117 |
/* Generate CRC32 lookup table. */ |
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118 |
GenerateCRC32Table(); |
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119 |
|
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120 |
/* Get retain size in bytes */ |
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121 |
retain_info.retain_size = GetRetainSize(); |
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122 |
|
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123 |
/* Hash stored in retain file as array of char in hex digits |
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124 |
(that's why we divide strlen in two). */ |
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125 |
retain_info.hash_size = PLC_ID ? strlen(PLC_ID)/2 : 0; |
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126 |
//retain_info.hash_size = 0; |
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retain_info.hash = malloc(retain_info.hash_size); |
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128 |
|
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129 |
/* Transform hash string into byte sequence. */ |
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130 |
for (i = 0; i < retain_info.hash_size; i++) { |
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131 |
int byte = 0; |
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sscanf((PLC_ID + i*2), "%02X", &byte); |
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retain_info.hash[i] = byte; |
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134 |
} |
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135 |
|
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136 |
/* Calc header offset. */ |
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retain_info.header_offset = sizeof(retain_info.retain_size) + \ |
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138 |
sizeof(retain_info.hash_size) + \ |
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139 |
retain_info.hash_size; |
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140 |
|
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141 |
/* Set header CRC initial state. */ |
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142 |
retain_info.header_crc = 0; |
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143 |
|
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144 |
/* Calc crc for header. */ |
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145 |
retain_info.header_crc = GenerateCRC32Sum( |
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146 |
&retain_info.retain_size, |
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147 |
sizeof(retain_info.retain_size), |
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148 |
retain_info.header_crc); |
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149 |
|
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retain_info.header_crc = GenerateCRC32Sum( |
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151 |
&retain_info.hash_size, |
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152 |
sizeof(retain_info.hash_size), |
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153 |
retain_info.header_crc); |
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154 |
|
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155 |
retain_info.header_crc = GenerateCRC32Sum( |
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156 |
retain_info.hash, |
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157 |
retain_info.hash_size, |
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158 |
retain_info.header_crc); |
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159 |
} |
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160 |
|
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161 |
void CleanupRetain(void) |
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162 |
{ |
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163 |
/* Free hash memory. */ |
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164 |
free(retain_info.hash); |
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165 |
} |
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166 |
|
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167 |
int CheckRetainFile(const char * file) |
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168 |
{ |
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169 |
retain_buffer = fopen(file, "rb"); |
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170 |
if (retain_buffer) { |
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171 |
/* Check CRC32 and hash. */ |
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172 |
if (CheckFileCRC(retain_buffer)) |
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173 |
if (CheckFilehash()) |
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174 |
return 1; |
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175 |
fclose(retain_buffer); |
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176 |
retain_buffer = NULL; |
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177 |
} |
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178 |
return 0; |
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179 |
} |
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180 |
|
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181 |
int CheckRetainBuffer(void) |
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182 |
{ |
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183 |
retain_buffer = NULL; |
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184 |
if (!retain_info.retain_size) |
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185 |
return 1; |
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186 |
|
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187 |
/* Check latest retain file. */ |
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188 |
if (CheckRetainFile(rb_file)) |
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189 |
return 1; |
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|
190 |
|
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|
191 |
/* Check if we have backup. */ |
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192 |
if (CheckRetainFile(rb_file_bckp)) |
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|
193 |
return 1; |
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|
194 |
|
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195 |
/* We don't have any valid retain buffer - nothing to remind. */ |
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196 |
return 0; |
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197 |
} |
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|
198 |
|
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|
199 |
#ifndef FILE_RETAIN_SAVE_PERIOD_S |
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200 |
#define FILE_RETAIN_SAVE_PERIOD_S 1.0 |
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201 |
#endif |
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202 |
|
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|
203 |
static double CalcDiffSeconds(IEC_TIME* t1, IEC_TIME *t2) |
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204 |
{ |
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|
205 |
IEC_TIME dt ={ |
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206 |
t1->tv_sec - t2->tv_sec, |
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|
207 |
t1->tv_nsec - t2->tv_nsec |
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|
208 |
}; |
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|
209 |
|
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|
210 |
if ((dt.tv_nsec < -1000000000) || ((dt.tv_sec > 0) && (dt.tv_nsec < 0))){ |
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211 |
dt.tv_sec--; |
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212 |
dt.tv_nsec += 1000000000; |
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|
213 |
} |
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|
214 |
if ((dt.tv_nsec > +1000000000) || ((dt.tv_sec < 0) && (dt.tv_nsec > 0))){ |
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215 |
dt.tv_sec++; |
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216 |
dt.tv_nsec -= 1000000000; |
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217 |
} |
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218 |
return dt.tv_sec + 1e-9*dt.tv_nsec; |
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219 |
} |
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220 |
|
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221 |
|
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222 |
int RetainSaveNeeded(void) |
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223 |
{ |
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224 |
int ret = 0; |
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225 |
static IEC_TIME last_save; |
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226 |
IEC_TIME now; |
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|
227 |
double diff_s; |
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|
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/* no retain */ |
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if (!retain_info.retain_size) |
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return 0; |
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|
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/* periodic retain flush to avoid high I/O load */ |
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PLC_GetTime(&now); |
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235 |
|
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diff_s = CalcDiffSeconds(&now, &last_save); |
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|
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if ((diff_s > FILE_RETAIN_SAVE_PERIOD_S) || ForceSaveRetainReq()) { |
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ret = 1; |
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last_save = now; |
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241 |
} |
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return ret; |
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243 |
} |
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244 |
|
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void ValidateRetainBuffer(void) |
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246 |
{ |
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if (!retain_buffer) |
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return; |
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249 |
|
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/* Add retain data CRC to the end of buffer file. */ |
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fseek(retain_buffer, 0, SEEK_END); |
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fwrite(&retain_crc, sizeof(retain_crc), 1, retain_buffer); |
2174
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253 |
|
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/* Sync file buffer and close file. */ |
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255 |
#ifdef __WIN32 |
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fflush(retain_buffer); |
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257 |
#else |
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fsync(fileno(retain_buffer)); |
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259 |
#endif |
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260 |
|
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fclose(retain_buffer); |
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retain_buffer = NULL; |
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263 |
} |
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264 |
|
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265 |
void InValidateRetainBuffer(void) |
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266 |
{ |
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267 |
if (!RetainSaveNeeded()) |
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268 |
return; |
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269 |
|
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270 |
/* Rename old retain file into *.bak if it exists. */ |
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271 |
rename(rb_file, rb_file_bckp); |
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272 |
|
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273 |
/* Set file CRC initial value. */ |
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274 |
retain_crc = retain_info.header_crc; |
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275 |
|
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276 |
/* Create new retain file. */ |
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retain_buffer = fopen(rb_file, "wb+"); |
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278 |
if (!retain_buffer) { |
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279 |
fprintf(stderr, "Failed to create retain file : %s\n", rb_file); |
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280 |
return; |
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281 |
} |
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282 |
|
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283 |
/* Write header to the new file. */ |
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284 |
fwrite(&retain_info.retain_size, |
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285 |
sizeof(retain_info.retain_size), 1, retain_buffer); |
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286 |
fwrite(&retain_info.hash_size, |
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287 |
sizeof(retain_info.hash_size), 1, retain_buffer); |
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288 |
fwrite(retain_info.hash , |
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289 |
sizeof(char), retain_info.hash_size, retain_buffer); |
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290 |
} |
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291 |
|
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292 |
void Retain(unsigned int offset, unsigned int count, void *p) |
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293 |
{ |
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294 |
if (!retain_buffer) |
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295 |
return; |
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296 |
|
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297 |
/* Generate CRC 32 for each data block. */ |
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298 |
retain_crc = GenerateCRC32Sum(p, count, retain_crc); |
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299 |
|
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300 |
/* Save current var in file. */ |
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301 |
fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET); |
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302 |
fwrite(p, count, 1, retain_buffer); |
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|
303 |
} |
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|
304 |
|
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|
305 |
void Remind(unsigned int offset, unsigned int count, void *p) |
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|
306 |
{ |
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|
307 |
/* Remind variable from file. */ |
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|
308 |
fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET); |
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|
309 |
fread((void *)p, count, 1, retain_buffer); |
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|
310 |
} |
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|
311 |
#endif // !HAVE_RETAIN |