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16
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1 /***********************************************************************
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2 *
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3 * Borrowed from WINE sources!! (http://www.winehq.com)
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4 * Converts a Win32 FILETIME structure to a UNIX time_t value
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5 */
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6
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7 /*** WARNING ****
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8 * This file is not to be incluided in a Visual C++ Project
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9 * It will make the whole project fail to compile
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10 * There are functions in libpst.c to handle the dates
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11 * Do not use this one
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12 */
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13
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14 #include <time.h>
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15 #include "common.h"
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16 #include "timeconv.h"
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17
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18 time_t fileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder );
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19 char * fileTimeToAscii (const FILETIME *filetime);
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20
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21 char * fileTimeToAscii (const FILETIME *filetime) {
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22 time_t t1;
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23
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24 t1 = fileTimeToUnixTime(filetime,0);
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25 return ctime(&t1);
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26 }
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27
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28 struct tm * fileTimeToStructTM (const FILETIME *filetime) {
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29 time_t t1;
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30 t1 = fileTimeToUnixTime(filetime, 0);
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31 return gmtime(&t1);
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32 }
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33
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34 /***********************************************************************
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35 * DOSFS_FileTimeToUnixTime
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36 *
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37 * Convert a FILETIME format to Unix time.
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38 * If not NULL, 'remainder' contains the fractional part of the filetime,
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39 * in the range of [0..9999999] (even if time_t is negative).
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40 */
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41 time_t fileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder )
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42 {
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43 /* Read the comment in the function DOSFS_UnixTimeToFileTime. */
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44 #if USE_LONG_LONG
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45
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46 long long int t = filetime->dwHighDateTime;
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47 t <<= 32;
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48 t += (UINT32)filetime->dwLowDateTime;
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49 t -= 116444736000000000LL;
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50 if (t < 0)
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51 {
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52 if (remainder) *remainder = 9999999 - (-t - 1) % 10000000;
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53 return -1 - ((-t - 1) / 10000000);
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54 }
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55 else
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56 {
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57 if (remainder) *remainder = t % 10000000;
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58 return t / 10000000;
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59 }
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60
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61 #else /* ISO version */
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62
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63 UINT32 a0; /* 16 bit, low bits */
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64 UINT32 a1; /* 16 bit, medium bits */
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65 UINT32 a2; /* 32 bit, high bits */
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66 UINT32 r; /* remainder of division */
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67 unsigned int carry; /* carry bit for subtraction */
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68 int negative; /* whether a represents a negative value */
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69
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70 /* Copy the time values to a2/a1/a0 */
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71 a2 = (UINT32)filetime->dwHighDateTime;
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72 a1 = ((UINT32)filetime->dwLowDateTime ) >> 16;
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73 a0 = ((UINT32)filetime->dwLowDateTime ) & 0xffff;
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74
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75 /* Subtract the time difference */
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76 if (a0 >= 32768 ) a0 -= 32768 , carry = 0;
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77 else a0 += (1 << 16) - 32768 , carry = 1;
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78
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79 if (a1 >= 54590 + carry) a1 -= 54590 + carry, carry = 0;
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80 else a1 += (1 << 16) - 54590 - carry, carry = 1;
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81
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82 a2 -= 27111902 + carry;
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83
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84 /* If a is negative, replace a by (-1-a) */
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85 negative = (a2 >= ((UINT32)1) << 31);
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86 if (negative)
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87 {
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88 /* Set a to -a - 1 (a is a2/a1/a0) */
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89 a0 = 0xffff - a0;
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90 a1 = 0xffff - a1;
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91 a2 = ~a2;
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92 }
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93
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94 /* Divide a by 10000000 (a = a2/a1/a0), put the rest into r.
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95 Split the divisor into 10000 * 1000 which are both less than 0xffff. */
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96 a1 += (a2 % 10000) << 16;
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97 a2 /= 10000;
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98 a0 += (a1 % 10000) << 16;
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99 a1 /= 10000;
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100 r = a0 % 10000;
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101 a0 /= 10000;
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102
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103 a1 += (a2 % 1000) << 16;
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104 a2 /= 1000;
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105 a0 += (a1 % 1000) << 16;
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106 a1 /= 1000;
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107 r += (a0 % 1000) * 10000;
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108 a0 /= 1000;
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109
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110 /* If a was negative, replace a by (-1-a) and r by (9999999 - r) */
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111 if (negative)
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112 {
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113 /* Set a to -a - 1 (a is a2/a1/a0) */
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114 a0 = 0xffff - a0;
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115 a1 = 0xffff - a1;
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116 a2 = ~a2;
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117
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118 r = 9999999 - r;
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119 }
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120
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121 if (remainder) *remainder = r;
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122
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123 /* Do not replace this by << 32, it gives a compiler warning and it does
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124 not work. */
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125 return ((((time_t)a2) << 16) << 16) + (a1 << 16) + a0;
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126 #endif
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127 }
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