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Add even more of the source

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This should be about everything needed to build so far?
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Darren VanBuren 2017-03-07 17:14:16 -08:00
parent af3619d4fa
commit 849723c9cf
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CommonUtilitiesLib/DateTranslator.cpp Normal file
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/*
*
* @APPLE_LICENSE_HEADER_START@
*
* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*
*/
/*
File: DateTranslator.h
Contains: Efficient routines & data structures for converting from
RFC 1123 compliant date strings to local file system dates & vice versa.
*/
#include "DateTranslator.h"
#include <time.h>
#include "OSHeaders.h"
#include "OS.h"
#include "StringParser.h"
#include "StrPtrLen.h"
// If you assign values of 0 - 25 for all the letters, and sum up the values of
// the letters in each month, you get a table that looks like this. For instance,
// "Jul" = 9 + 20 + 11 = 40. The value of July in a C tm struct is 6, so position
// 40 = 6 in this array.
const UInt32 kMonthHashTable[] =
{
12, 12, 12, 12, 12, 12, 12, 12, 12, 11, // 0 - 9
1, 12, 12, 12, 12, 12, 12, 12, 12, 12, // 10 - 19
12, 12, 0, 12, 12, 12, 7, 12, 12, 2, // 20 - 29
12, 12, 3, 12, 12, 9, 4, 8, 12, 12, // 30 - 39
6, 12, 5, 12, 12, 12, 12, 12, 10, 12 // 40 - 49
};
const UInt32 kMonthHashTableSize = 49;
SInt64 DateTranslator::ParseDate(StrPtrLen* inDateString)
{
//SEE RFC 1123 for details on the date string format
//ex: Mon, 04 Nov 1996 21:42:17 GMT
// Parse the date buffer, filling out a tm struct
struct tm theDateStruct;
::memset(&theDateStruct, 0, sizeof(theDateStruct));
// All RFC 1123 dates are the same length.
if (inDateString->Len != DateBuffer::kDateBufferLen)
return 0;
StringParser theDateParser(inDateString);
// the day of the week is redundant... we can skip it!
theDateParser.ConsumeLength(NULL, 5);
// We are at the date now.
theDateStruct.tm_mday = theDateParser.ConsumeInteger(NULL);
theDateParser.ConsumeWhitespace();
// We are at the month now. Use our hand-crafted perfect hash table
// to get the right value to place in the tm struct
if (theDateParser.GetDataRemaining() < 4)
return 0;
UInt32 theIndex = ConvertCharToMonthTableIndex(theDateParser.GetCurrentPosition()[0]) +
ConvertCharToMonthTableIndex(theDateParser.GetCurrentPosition()[1]) +
ConvertCharToMonthTableIndex(theDateParser.GetCurrentPosition()[2]);
if (theIndex > kMonthHashTableSize)
return 0;
theDateStruct.tm_mon = kMonthHashTable[theIndex];
// If the month is illegal, return an error
if (theDateStruct.tm_mon >= 12)
return 0;
// Skip over the date
theDateParser.ConsumeLength(NULL, 4);
// Grab the year (years since 1900 is what the tm struct wants)
theDateStruct.tm_year = theDateParser.ConsumeInteger(NULL) - 1900;
theDateParser.ConsumeWhitespace();
// Now just grab hour, minute, second
theDateStruct.tm_hour = theDateParser.ConsumeInteger(NULL);
theDateStruct.tm_hour += OS::GetGMTOffset();
theDateParser.ConsumeLength(NULL, 1); //skip over ':'
theDateStruct.tm_min = theDateParser.ConsumeInteger(NULL);
theDateParser.ConsumeLength(NULL, 1); //skip over ':'
theDateStruct.tm_sec = theDateParser.ConsumeInteger(NULL);
// Ok, we've filled out the tm struct completely, now convert it to a time_t
time_t theTime = ::mktime(&theDateStruct);
return (SInt64)theTime * 1000; // convert to a time value in our timebase.
}
void DateTranslator::UpdateDateBuffer(DateBuffer* inDateBuffer, const SInt64& inDate, time_t gmtoffset)
{
if (inDateBuffer == NULL)
return;
struct tm* gmt = NULL;
struct tm timeResult;
if (inDate == 0)
{
time_t calendarTime = ::time(NULL) + gmtoffset;
gmt = ::qtss_gmtime(&calendarTime, &timeResult);
}
else
{
time_t convertedTime = (time_t)(inDate / (SInt64)1000) + gmtoffset ; // Convert from msec to sec
gmt = ::qtss_gmtime(&convertedTime, &timeResult);
}
Assert(gmt != NULL); //is it safe to assert this?
size_t size = 0;
if (0 == gmtoffset)
size = qtss_strftime( inDateBuffer->fDateBuffer, sizeof(inDateBuffer->fDateBuffer),
"%a, %d %b %Y %H:%M:%S GMT", gmt);
Assert(size == DateBuffer::kDateBufferLen);
}
void DateBuffer::InexactUpdate()
{
SInt64 theCurTime = OS::Milliseconds();
if ((fLastDateUpdate == 0) || ((fLastDateUpdate + kUpdateInterval) < theCurTime))
{
fLastDateUpdate = theCurTime;
this->Update(0);
}
}