Mercurial > libpst
annotate src/timeconv.c @ 127:c2482d0cd84e
common cannot include config.h
| author | Carl Byington <carl@five-ten-sg.com> |
|---|---|
| date | Thu, 05 Feb 2009 09:20:02 -0800 |
| parents | ab2a11e72250 |
| children | fc11b1d1ad34 |
| rev | line source |
|---|---|
| 16 | 1 /*********************************************************************** |
| 2 * | |
| 3 * Borrowed from WINE sources!! (http://www.winehq.com) | |
| 4 * Converts a Win32 FILETIME structure to a UNIX time_t value | |
| 5 */ | |
| 6 | |
| 7 /*** WARNING **** | |
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8 * This file is not to be included in a Visual C++ Project |
| 16 | 9 * It will make the whole project fail to compile |
| 10 * There are functions in libpst.c to handle the dates | |
| 11 * Do not use this one | |
| 12 */ | |
| 13 | |
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14 #ifndef _WIN32 |
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15 |
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16 #include "common.h" |
| 16 | 17 #include "timeconv.h" |
| 18 | |
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19 #include "define.h" |
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20 |
| 16 | 21 char * fileTimeToAscii (const FILETIME *filetime) { |
| 22 time_t t1; | |
| 23 | |
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24 t1 = fileTimeToUnixTime(filetime, NULL); |
| 16 | 25 return ctime(&t1); |
| 26 } | |
| 27 | |
| 28 struct tm * fileTimeToStructTM (const FILETIME *filetime) { | |
| 29 time_t t1; | |
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30 t1 = fileTimeToUnixTime(filetime, NULL); |
| 16 | 31 return gmtime(&t1); |
| 32 } | |
| 33 | |
| 34 /*********************************************************************** | |
| 35 * DOSFS_FileTimeToUnixTime | |
| 36 * | |
| 37 * Convert a FILETIME format to Unix time. | |
| 38 * If not NULL, 'remainder' contains the fractional part of the filetime, | |
| 39 * in the range of [0..9999999] (even if time_t is negative). | |
| 40 */ | |
| 41 time_t fileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder ) | |
| 42 { | |
| 43 /* Read the comment in the function DOSFS_UnixTimeToFileTime. */ | |
| 44 #if USE_LONG_LONG | |
| 45 | |
| 46 long long int t = filetime->dwHighDateTime; | |
| 47 t <<= 32; | |
| 48 t += (UINT32)filetime->dwLowDateTime; | |
| 49 t -= 116444736000000000LL; | |
| 50 if (t < 0) | |
| 51 { | |
| 52 if (remainder) *remainder = 9999999 - (-t - 1) % 10000000; | |
| 53 return -1 - ((-t - 1) / 10000000); | |
| 54 } | |
| 55 else | |
| 56 { | |
| 57 if (remainder) *remainder = t % 10000000; | |
| 58 return t / 10000000; | |
| 59 } | |
| 60 | |
| 61 #else /* ISO version */ | |
| 62 | |
| 63 UINT32 a0; /* 16 bit, low bits */ | |
| 64 UINT32 a1; /* 16 bit, medium bits */ | |
| 65 UINT32 a2; /* 32 bit, high bits */ | |
| 66 UINT32 r; /* remainder of division */ | |
| 67 unsigned int carry; /* carry bit for subtraction */ | |
| 68 int negative; /* whether a represents a negative value */ | |
| 69 | |
| 70 /* Copy the time values to a2/a1/a0 */ | |
| 71 a2 = (UINT32)filetime->dwHighDateTime; | |
| 72 a1 = ((UINT32)filetime->dwLowDateTime ) >> 16; | |
| 73 a0 = ((UINT32)filetime->dwLowDateTime ) & 0xffff; | |
| 74 | |
| 75 /* Subtract the time difference */ | |
| 76 if (a0 >= 32768 ) a0 -= 32768 , carry = 0; | |
| 77 else a0 += (1 << 16) - 32768 , carry = 1; | |
| 78 | |
| 79 if (a1 >= 54590 + carry) a1 -= 54590 + carry, carry = 0; | |
| 80 else a1 += (1 << 16) - 54590 - carry, carry = 1; | |
| 81 | |
| 82 a2 -= 27111902 + carry; | |
| 46 | 83 |
| 16 | 84 /* If a is negative, replace a by (-1-a) */ |
| 85 negative = (a2 >= ((UINT32)1) << 31); | |
| 86 if (negative) | |
| 87 { | |
| 88 /* Set a to -a - 1 (a is a2/a1/a0) */ | |
| 89 a0 = 0xffff - a0; | |
| 90 a1 = 0xffff - a1; | |
| 91 a2 = ~a2; | |
| 92 } | |
| 93 | |
| 94 /* Divide a by 10000000 (a = a2/a1/a0), put the rest into r. | |
| 95 Split the divisor into 10000 * 1000 which are both less than 0xffff. */ | |
| 96 a1 += (a2 % 10000) << 16; | |
| 97 a2 /= 10000; | |
| 98 a0 += (a1 % 10000) << 16; | |
| 99 a1 /= 10000; | |
| 100 r = a0 % 10000; | |
| 101 a0 /= 10000; | |
| 102 | |
| 103 a1 += (a2 % 1000) << 16; | |
| 104 a2 /= 1000; | |
| 105 a0 += (a1 % 1000) << 16; | |
| 106 a1 /= 1000; | |
| 107 r += (a0 % 1000) * 10000; | |
| 108 a0 /= 1000; | |
| 109 | |
| 110 /* If a was negative, replace a by (-1-a) and r by (9999999 - r) */ | |
| 111 if (negative) | |
| 112 { | |
| 113 /* Set a to -a - 1 (a is a2/a1/a0) */ | |
| 114 a0 = 0xffff - a0; | |
| 115 a1 = 0xffff - a1; | |
| 116 a2 = ~a2; | |
| 117 | |
| 118 r = 9999999 - r; | |
| 119 } | |
| 120 | |
| 121 if (remainder) *remainder = r; | |
| 122 | |
| 123 /* Do not replace this by << 32, it gives a compiler warning and it does | |
| 124 not work. */ | |
| 125 return ((((time_t)a2) << 16) << 16) + (a1 << 16) + a0; | |
| 126 #endif | |
| 127 } | |
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parents:
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diff
changeset
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128 |
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0f1492b7fe8b
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Carl Byington <carl@five-ten-sg.com>
parents:
75
diff
changeset
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129 #endif /* !_WIN32 */ |