author | Edouard Tisserant <edouard.tisserant@gmail.com> |
Wed, 30 Jun 2021 15:51:59 +0200 | |
branch | svghmi |
changeset 3267 | 5f20f391ae31 |
parent 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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static const uint32_t crc32_table[256] = { |
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0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, |
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0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, |
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0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, |
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0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, |
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0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, |
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0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, |
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0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, |
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0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, |
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0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, |
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49 |
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, |
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50 |
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, |
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51 |
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, |
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0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, |
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53 |
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, |
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54 |
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, |
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55 |
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, |
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56 |
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, |
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0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, |
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0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, |
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59 |
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, |
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0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, |
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use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux
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0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, |
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use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux
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62 |
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, |
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use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux
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63 |
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, |
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64 |
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, |
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65 |
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, |
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66 |
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, |
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0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, |
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0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, |
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0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, |
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use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux
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0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, |
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0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D, |
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72 |
}; |
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uint32_t retain_crc; |
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74 |
|
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75 |
|
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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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81 |
while (len--) |
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82 |
crc = crc32_table[(crc ^ *current++) & 0xFF] ^ (crc >> 8); |
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83 |
return ~crc; |
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|
84 |
} |
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|
85 |
|
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|
86 |
/* Calc CRC32 for retain file byte by byte. */ |
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|
87 |
int CheckFileCRC(FILE* file_buffer) |
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|
88 |
{ |
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|
89 |
/* Set the magic constant for one-pass CRC calc according to ZIP CRC32. */ |
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|
90 |
const uint32_t magic_number = 0x2144df1c; |
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|
91 |
|
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|
92 |
/* CRC initial state. */ |
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|
93 |
uint32_t calc_crc32 = 0; |
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|
94 |
char data_block = 0; |
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|
95 |
|
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|
96 |
while(!feof(file_buffer)){ |
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|
97 |
if (fread(&data_block, sizeof(data_block), 1, file_buffer)) |
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98 |
calc_crc32 = GenerateCRC32Sum(&data_block, sizeof(data_block), calc_crc32); |
2174
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|
99 |
} |
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100 |
|
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101 |
/* Compare crc result with a magic number. */ |
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102 |
return (calc_crc32 == magic_number) ? 1 : 0; |
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|
103 |
} |
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|
104 |
|
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105 |
/* Compare current hash with hash from file byte by byte. */ |
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106 |
int CheckFilehash(void) |
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107 |
{ |
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108 |
unsigned int k; |
2174
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109 |
int offset = sizeof(retain_info.retain_size); |
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110 |
|
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|
111 |
rewind(retain_buffer); |
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112 |
fseek(retain_buffer, offset , SEEK_SET); |
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113 |
|
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114 |
uint32_t size; |
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115 |
fread(&size, sizeof(size), 1, retain_buffer); |
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116 |
if (size != retain_info.hash_size) |
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117 |
return 0; |
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118 |
|
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119 |
for(k = 0; k < retain_info.hash_size; k++){ |
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120 |
uint8_t file_digit; |
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121 |
fread(&file_digit, sizeof(file_digit), 1, retain_buffer); |
2174
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122 |
if (file_digit != *(retain_info.hash+k)) |
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123 |
return 0; |
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124 |
} |
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125 |
|
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126 |
return 1; |
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127 |
} |
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|
128 |
|
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129 |
void InitRetain(void) |
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130 |
{ |
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131 |
unsigned int i; |
2174
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132 |
|
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133 |
/* Get retain size in bytes */ |
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|
134 |
retain_info.retain_size = GetRetainSize(); |
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|
135 |
|
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|
136 |
/* Hash stored in retain file as array of char in hex digits |
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|
137 |
(that's why we divide strlen in two). */ |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
138 |
retain_info.hash_size = PLC_ID ? strlen(PLC_ID)/2 : 0; |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
139 |
//retain_info.hash_size = 0; |
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|
140 |
retain_info.hash = malloc(retain_info.hash_size); |
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parents:
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|
141 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
142 |
/* Transform hash string into byte sequence. */ |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
143 |
for (i = 0; i < retain_info.hash_size; i++) { |
55611282b909
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parents:
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|
144 |
int byte = 0; |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
145 |
sscanf((PLC_ID + i*2), "%02X", &byte); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
146 |
retain_info.hash[i] = byte; |
55611282b909
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|
147 |
} |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
148 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
149 |
/* Calc header offset. */ |
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|
150 |
retain_info.header_offset = sizeof(retain_info.retain_size) + \ |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
151 |
sizeof(retain_info.hash_size) + \ |
55611282b909
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|
152 |
retain_info.hash_size; |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
153 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
154 |
/* Set header CRC initial state. */ |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
155 |
retain_info.header_crc = 0; |
55611282b909
Use the same retain implementation for Win32 targets
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|
156 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
157 |
/* Calc crc for header. */ |
55611282b909
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|
158 |
retain_info.header_crc = GenerateCRC32Sum( |
55611282b909
Use the same retain implementation for Win32 targets
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|
159 |
&retain_info.retain_size, |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
160 |
sizeof(retain_info.retain_size), |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
161 |
retain_info.header_crc); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
162 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
163 |
retain_info.header_crc = GenerateCRC32Sum( |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
164 |
&retain_info.hash_size, |
55611282b909
Use the same retain implementation for Win32 targets
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|
165 |
sizeof(retain_info.hash_size), |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
166 |
retain_info.header_crc); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
167 |
|
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
168 |
retain_info.header_crc = GenerateCRC32Sum( |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
169 |
retain_info.hash, |
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|
170 |
retain_info.hash_size, |
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Use the same retain implementation for Win32 targets
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changeset
|
171 |
retain_info.header_crc); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
172 |
} |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
173 |
|
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
174 |
void CleanupRetain(void) |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
175 |
{ |
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|
176 |
/* Free hash memory. */ |
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|
177 |
free(retain_info.hash); |
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Use the same retain implementation for Win32 targets
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|
178 |
} |
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Use the same retain implementation for Win32 targets
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|
179 |
|
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|
180 |
int CheckRetainFile(const char * file) |
55611282b909
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|
181 |
{ |
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Use the same retain implementation for Win32 targets
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|
182 |
retain_buffer = fopen(file, "rb"); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
183 |
if (retain_buffer) { |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
184 |
/* Check CRC32 and hash. */ |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
185 |
if (CheckFileCRC(retain_buffer)) |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
186 |
if (CheckFilehash()) |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
187 |
return 1; |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
188 |
fclose(retain_buffer); |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
189 |
retain_buffer = NULL; |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
190 |
} |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
191 |
return 0; |
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Use the same retain implementation for Win32 targets
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|
192 |
} |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
193 |
|
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|
194 |
int CheckRetainBuffer(void) |
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|
195 |
{ |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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196 |
retain_buffer = NULL; |
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197 |
if (!retain_info.retain_size) |
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198 |
return 1; |
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199 |
|
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200 |
/* Check latest retain file. */ |
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201 |
if (CheckRetainFile(rb_file)) |
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202 |
return 1; |
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203 |
|
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204 |
/* Check if we have backup. */ |
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205 |
if (CheckRetainFile(rb_file_bckp)) |
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206 |
return 1; |
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207 |
|
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208 |
/* We don't have any valid retain buffer - nothing to remind. */ |
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209 |
return 0; |
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210 |
} |
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211 |
|
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212 |
#ifndef FILE_RETAIN_SAVE_PERIOD_S |
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213 |
#define FILE_RETAIN_SAVE_PERIOD_S 1.0 |
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214 |
#endif |
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215 |
|
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216 |
static double CalcDiffSeconds(IEC_TIME* t1, IEC_TIME *t2) |
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217 |
{ |
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218 |
IEC_TIME dt ={ |
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219 |
t1->tv_sec - t2->tv_sec, |
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220 |
t1->tv_nsec - t2->tv_nsec |
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221 |
}; |
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222 |
|
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223 |
if ((dt.tv_nsec < -1000000000) || ((dt.tv_sec > 0) && (dt.tv_nsec < 0))){ |
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224 |
dt.tv_sec--; |
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225 |
dt.tv_nsec += 1000000000; |
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226 |
} |
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227 |
if ((dt.tv_nsec > +1000000000) || ((dt.tv_sec < 0) && (dt.tv_nsec > 0))){ |
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228 |
dt.tv_sec++; |
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229 |
dt.tv_nsec -= 1000000000; |
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230 |
} |
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231 |
return dt.tv_sec + 1e-9*dt.tv_nsec; |
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232 |
} |
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233 |
|
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234 |
|
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235 |
int RetainSaveNeeded(void) |
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236 |
{ |
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237 |
int ret = 0; |
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238 |
static IEC_TIME last_save; |
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239 |
IEC_TIME now; |
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240 |
double diff_s; |
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241 |
|
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242 |
/* no retain */ |
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243 |
if (!retain_info.retain_size) |
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|
244 |
return 0; |
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|
245 |
|
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|
246 |
/* periodic retain flush to avoid high I/O load */ |
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|
247 |
PLC_GetTime(&now); |
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|
248 |
|
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249 |
diff_s = CalcDiffSeconds(&now, &last_save); |
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|
250 |
|
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|
251 |
if ((diff_s > FILE_RETAIN_SAVE_PERIOD_S) || ForceSaveRetainReq()) { |
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|
252 |
ret = 1; |
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|
253 |
last_save = now; |
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|
254 |
} |
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|
255 |
return ret; |
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|
256 |
} |
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|
257 |
|
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|
258 |
void ValidateRetainBuffer(void) |
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|
259 |
{ |
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|
260 |
if (!retain_buffer) |
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|
261 |
return; |
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|
262 |
|
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|
263 |
/* Add retain data CRC to the end of buffer file. */ |
55611282b909
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|
264 |
fseek(retain_buffer, 0, SEEK_END); |
2227
f150783ee8e7
Fix some compilation warnings for better ANSI C compliance
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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2178
diff
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|
265 |
fwrite(&retain_crc, sizeof(retain_crc), 1, retain_buffer); |
2174
55611282b909
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|
266 |
|
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|
267 |
/* Sync file buffer and close file. */ |
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|
268 |
#ifdef __WIN32 |
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|
269 |
fflush(retain_buffer); |
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|
270 |
#else |
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|
271 |
fsync(fileno(retain_buffer)); |
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|
272 |
#endif |
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|
273 |
|
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|
274 |
fclose(retain_buffer); |
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|
275 |
retain_buffer = NULL; |
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|
276 |
} |
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|
277 |
|
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|
278 |
void InValidateRetainBuffer(void) |
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|
279 |
{ |
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|
280 |
if (!RetainSaveNeeded()) |
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|
281 |
return; |
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|
282 |
|
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
283 |
/* Rename old retain file into *.bak if it exists. */ |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
284 |
rename(rb_file, rb_file_bckp); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
285 |
|
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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diff
changeset
|
286 |
/* Set file CRC initial value. */ |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
287 |
retain_crc = retain_info.header_crc; |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
288 |
|
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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diff
changeset
|
289 |
/* Create new retain file. */ |
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|
290 |
retain_buffer = fopen(rb_file, "wb+"); |
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Use the same retain implementation for Win32 targets
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changeset
|
291 |
if (!retain_buffer) { |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
292 |
fprintf(stderr, "Failed to create retain file : %s\n", rb_file); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
293 |
return; |
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Use the same retain implementation for Win32 targets
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changeset
|
294 |
} |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
|
295 |
|
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parents:
diff
changeset
|
296 |
/* Write header to the new file. */ |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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changeset
|
297 |
fwrite(&retain_info.retain_size, |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
298 |
sizeof(retain_info.retain_size), 1, retain_buffer); |
55611282b909
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|
299 |
fwrite(&retain_info.hash_size, |
55611282b909
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
300 |
sizeof(retain_info.hash_size), 1, retain_buffer); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
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|
301 |
fwrite(retain_info.hash , |
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Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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|
302 |
sizeof(char), retain_info.hash_size, retain_buffer); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
303 |
} |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
304 |
|
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
305 |
void Retain(unsigned int offset, unsigned int count, void *p) |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
306 |
{ |
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Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
307 |
if (!retain_buffer) |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
308 |
return; |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
309 |
|
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
310 |
/* Generate CRC 32 for each data block. */ |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
diff
changeset
|
311 |
retain_crc = GenerateCRC32Sum(p, count, retain_crc); |
55611282b909
Use the same retain implementation for Win32 targets
Andrey Skvortsov <andrej.skvortzov@gmail.com>
parents:
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changeset
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312 |
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/* Save current var in file. */ |
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fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET); |
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parents:
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fwrite(p, count, 1, retain_buffer); |
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} |
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|
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void Remind(unsigned int offset, unsigned int count, void *p) |
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{ |
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320 |
/* Remind variable from file. */ |
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fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET); |
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parents:
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fread((void *)p, count, 1, retain_buffer); |
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parents:
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} |
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#endif // !HAVE_RETAIN |