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Merge pull request #4 from johnezang/master
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Faster HTTP date parsing (22x faster!)
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@steipete
steipete committed Dec 25, 2011
2 parents cf09645 + e1864af commit f8cf070
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284 changes: 241 additions & 43 deletions SDURLCache.m
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Expand Up @@ -27,22 +27,242 @@
#define kAFURLCachePath @"SDNetworkingURLCache"
#define kAFURLCacheMaintenanceTime 5ull

static NSTimeInterval const kAFURLCacheInfoDefaultMinCacheInterval = 5 * 60; // 5 minute
static NSTimeInterval const kAFURLCacheInfoDefaultMinCacheInterval = 5.0 * 60.0; // 5 minute
static NSString *const kAFURLCacheInfoFileName = @"cacheInfo.plist";
static NSString *const kAFURLCacheInfoDiskUsageKey = @"diskUsage";
static NSString *const kAFURLCacheInfoAccessesKey = @"accesses";
static NSString *const kAFURLCacheInfoSizesKey = @"sizes";
static float const kAFURLCacheLastModFraction = 0.1f; // 10% since Last-Modified suggested by RFC2616 section 13.2.4
static float const kAFURLCacheDefault = 3600; // Default cache expiration delay if none defined (1 hour)

static NSDateFormatter* CreateDateFormatter(NSString *format) {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
[dateFormatter setDateFormat:format];
return dateFormatter;
static float const kAFURLCacheDefault = 3600.0f; // Default cache expiration delay if none defined (1 hour)


static const char _httpDate_trans_keys[] = {
0, 0, 70, 87, 114, 114, 105, 105, 32, 100, 65, 83, 112, 117, 114, 114, 32,
32, 32, 57, 48, 57, 32, 32, 48, 57, 48, 57, 58, 58, 48, 57, 48, 57,
58, 58, 48, 57, 48, 57, 32, 32, 48, 57, 48, 57, 48, 57, 48, 57, 103,
103, 101, 101, 99, 99, 101, 101, 98, 98, 97, 117, 110, 110, 108, 110, 97, 97,
114, 121, 111, 111, 118, 118, 99, 99, 116, 116, 101, 101, 112, 112, 32, 32, 48,
57, 48, 57, 32, 32, 65, 83, 112, 117, 114, 114, 32, 32, 48, 57, 48, 57,
48, 57, 48, 57, 32, 32, 48, 57, 48, 57, 58, 58, 48, 57, 48, 57, 58,
58, 48, 57, 48, 57, 32, 32, 71, 71, 77, 77, 84, 84, 103, 103, 101, 101,
99, 99, 101, 101, 98, 98, 97, 117, 110, 110, 108, 110, 97, 97, 114, 121, 111,
111, 118, 118, 99, 99, 116, 116, 101, 101, 112, 112, 97, 97, 121, 121, 44, 44,
32, 32, 48, 57, 48, 57, 45, 45, 65, 83, 112, 117, 114, 114, 45, 45, 48,
57, 48, 57, 32, 32, 48, 57, 48, 57, 58, 58, 48, 57, 48, 57, 58, 58,
48, 57, 48, 57, 32, 32, 71, 71, 77, 77, 84, 84, 103, 103, 101, 101, 99,
99, 101, 101, 98, 98, 97, 117, 110, 110, 108, 110, 97, 97, 114, 121, 111, 111,
118, 118, 99, 99, 116, 116, 101, 101, 112, 112, 111, 111, 110, 110, 97, 117, 116,
116, 32, 117, 114, 114, 100, 100, 104, 117, 117, 117, 32, 114, 115, 115, 101, 101,
32, 115, 101, 101, 100, 100, 32, 110, 101, 101, 0, 0, 0, 0, 0, 0, 0
};

static const char _httpDate_key_spans[] = {
0, 18, 1, 1, 69, 19, 6, 1, 1, 26, 10, 1, 10, 10, 1, 10, 10,
1, 10, 10, 1, 10, 10, 10, 10, 1, 1, 1, 1, 1, 21, 1, 3, 1,
8, 1, 1, 1, 1, 1, 1, 1, 10, 10, 1, 19, 6, 1, 1, 10, 10,
10, 10, 1, 10, 10, 1, 10, 10, 1, 10, 10, 1, 1, 1, 1, 1, 1,
1, 1, 1, 21, 1, 3, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 10, 10, 1, 19, 6, 1, 1, 10, 10, 1, 10, 10, 1, 10, 10, 1,
10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 21, 1, 3, 1, 8, 1,
1, 1, 1, 1, 1, 1, 1, 21, 1, 86, 1, 1, 14, 1, 83, 1, 1,
84, 1, 1, 79, 1, 0, 0, 0
};

static const short _httpDate_index_offsets[] = {
0, 0, 19, 21, 23, 93, 113, 120, 122, 124, 151, 162, 164, 175, 186, 188, 199,
210, 212, 223, 234, 236, 247, 258, 269, 280, 282, 284, 286, 288, 290, 312, 314, 318,
320, 329, 331, 333, 335, 337, 339, 341, 343, 354, 365, 367, 387, 394, 396, 398, 409,
420, 431, 442, 444, 455, 466, 468, 479, 490, 492, 503, 514, 516, 518, 520, 522, 524,
526, 528, 530, 532, 554, 556, 560, 562, 571, 573, 575, 577, 579, 581, 583, 585, 587,
589, 591, 602, 613, 615, 635, 642, 644, 646, 657, 668, 670, 681, 692, 694, 705, 716,
718, 729, 740, 742, 744, 746, 748, 750, 752, 754, 756, 758, 780, 782, 786, 788, 797,
799, 801, 803, 805, 807, 809, 811, 813, 835, 837, 924, 926, 928, 943, 945, 1029, 1031,
1033, 1118, 1120, 1122, 1202, 1204, 1205, 1206
};

static const unsigned char _httpDate_indicies[] = {
0, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, 4, 1, 1,
5, 1, 6, 1, 7, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 10, 1, 11, 1, 1, 12, 1, 13, 1, 1, 1,
14, 1, 1, 15, 16, 17, 1, 1, 1, 18, 1, 19, 1, 1, 1, 1, 20,
1, 21, 1, 22, 1, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 1, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25, 1, 26, 1, 27, 27, 27, 27, 27, 27,
27, 27, 27, 27, 1, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 1, 29,
1, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 1, 31, 31, 31, 31, 31,
31, 31, 31, 31, 31, 1, 32, 1, 33, 33, 33, 33, 33, 33, 33, 33, 33,
33, 1, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 1, 35, 1, 36, 36,
36, 36, 36, 36, 36, 36, 36, 36, 1, 37, 37, 37, 37, 37, 37, 37, 37,
37, 37, 1, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 1, 39, 39, 39,
39, 39, 39, 39, 39, 39, 39, 1, 40, 1, 41, 1, 42, 1, 43, 1, 44,
1, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 46, 1, 47, 1, 48, 1, 49, 1, 50, 1, 51, 1, 1,
1, 1, 1, 1, 52, 1, 53, 1, 54, 1, 55, 1, 56, 1, 57, 1, 58,
1, 59, 1, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 1, 61, 61, 61,
61, 61, 61, 61, 61, 61, 61, 1, 62, 1, 63, 1, 1, 64, 1, 65, 1,
1, 1, 66, 1, 1, 67, 68, 69, 1, 1, 1, 70, 1, 71, 1, 1, 1,
1, 72, 1, 73, 1, 74, 1, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
1, 76, 76, 76, 76, 76, 76, 76, 76, 76, 76, 1, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 1, 78, 78, 78, 78, 78, 78, 78, 78, 78, 78, 1,
79, 1, 80, 80, 80, 80, 80, 80, 80, 80, 80, 80, 1, 81, 81, 81, 81,
81, 81, 81, 81, 81, 81, 1, 82, 1, 83, 83, 83, 83, 83, 83, 83, 83,
83, 83, 1, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 1, 85, 1, 86,
86, 86, 86, 86, 86, 86, 86, 86, 86, 1, 87, 87, 87, 87, 87, 87, 87,
87, 87, 87, 1, 88, 1, 89, 1, 90, 1, 91, 1, 92, 1, 93, 1, 94,
1, 95, 1, 96, 1, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 98, 1, 99, 1, 100, 1, 101, 1, 102,
1, 103, 1, 1, 1, 1, 1, 1, 104, 1, 105, 1, 106, 1, 107, 1, 108,
1, 109, 1, 110, 1, 111, 1, 112, 1, 113, 1, 114, 1, 115, 115, 115, 115,
115, 115, 115, 115, 115, 115, 1, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
1, 117, 1, 118, 1, 1, 119, 1, 120, 1, 1, 1, 121, 1, 1, 122, 123,
124, 1, 1, 1, 125, 1, 126, 1, 1, 1, 1, 127, 1, 128, 1, 129, 1,
130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 1, 131, 131, 131, 131, 131, 131,
131, 131, 131, 131, 1, 132, 1, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
1, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 1, 135, 1, 136, 136, 136,
136, 136, 136, 136, 136, 136, 136, 1, 137, 137, 137, 137, 137, 137, 137, 137, 137,
137, 1, 138, 1, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 1, 140, 140,
140, 140, 140, 140, 140, 140, 140, 140, 1, 141, 1, 142, 1, 143, 1, 144, 1,
145, 1, 146, 1, 147, 1, 148, 1, 149, 1, 150, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 151, 1, 152, 1,
153, 1, 154, 1, 155, 1, 156, 1, 1, 1, 1, 1, 1, 157, 1, 158, 1,
159, 1, 160, 1, 161, 1, 162, 1, 163, 1, 164, 1, 7, 1, 165, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
164, 1, 166, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 167, 1, 168, 1, 10, 1, 169, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 170, 1, 171, 1, 8, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 172, 1, 168, 1, 173, 1, 8, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 9, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 168, 1, 174, 1, 175, 1,
8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 176, 1, 172, 1, 1, 1, 1,
0
};

static const unsigned char _httpDate_trans_targs[] = {
2, 0, 124, 126, 131, 137, 3, 4, 5, 41, 82, 6, 26, 28, 30, 33, 35,
37, 39, 7, 25, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 141, 8, 27, 8, 29, 8, 31, 32, 8, 8, 8, 34,
8, 8, 36, 8, 38, 8, 40, 8, 42, 43, 44, 45, 46, 67, 69, 71, 74,
76, 78, 80, 47, 66, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 65, 142, 48, 68, 48, 70, 48, 72, 73, 48, 48, 48,
75, 48, 48, 77, 48, 79, 48, 81, 48, 83, 84, 85, 86, 87, 88, 89, 90,
109, 111, 113, 116, 118, 120, 122, 91, 108, 92, 93, 94, 95, 96, 97, 98, 99,
100, 101, 102, 103, 104, 105, 106, 107, 143, 92, 110, 92, 112, 92, 114, 115, 92,
92, 92, 117, 92, 92, 119, 92, 121, 92, 123, 92, 125, 127, 128, 129, 130, 132,
135, 133, 134, 136, 138, 139, 140
};

static const char _httpDate_trans_actions[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 2, 2, 0, 3, 3, 0, 4, 4, 0, 5,
5, 0, 6, 6, 6, 6, 7, 0, 8, 0, 9, 0, 0, 10, 11, 12, 0,
13, 14, 0, 15, 0, 16, 0, 17, 0, 2, 2, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 1, 0, 6, 6, 6, 6, 0, 3, 3, 0, 4, 4,
0, 5, 5, 0, 0, 0, 0, 7, 0, 8, 0, 9, 0, 0, 10, 11, 12,
0, 13, 14, 0, 15, 0, 16, 0, 17, 0, 0, 0, 0, 2, 2, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 6, 18, 0, 3, 3, 0,
4, 4, 0, 5, 5, 0, 0, 0, 0, 7, 0, 8, 0, 9, 0, 0, 10,
11, 12, 0, 13, 14, 0, 15, 0, 16, 0, 17, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0
};

static const char _httpDate_eof_actions[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 19, 20, 21
};

static NSDate *_parseHTTPDate(const char *buf, size_t bufLen) {
const char *p = buf, *pe = p + bufLen, *eof = pe;
int parsed = 0, cs = 1;
NSDate *date = NULL;

CFGregorianDate gdate;
memset(&gdate, 0, sizeof(CFGregorianDate));

{
int _slen, _trans;
const char *_keys;
const unsigned char *_inds;
if(p == pe) { goto _test_eof; }
_resume:
_keys = _httpDate_trans_keys + (cs << 1);
_inds = _httpDate_indicies + _httpDate_index_offsets[cs];
_slen = _httpDate_key_spans[cs];
_trans = _inds[(_slen > 0) && (_keys[0] <= (*p)) && ((*p) <= _keys[1]) ? (*p) - _keys[0] : _slen];
cs = _httpDate_trans_targs[_trans];

if(_httpDate_trans_actions[_trans] == 0) { goto _again; }

switch(_httpDate_trans_actions[_trans]) {
case 6: gdate.year = gdate.year * 10 + ((*p) - '0'); break;
case 18: gdate.year = gdate.year * 10 + ((*p) - '0'); gdate.year += 1900; break;
case 10: gdate.month = 1; break;
case 9: gdate.month = 2; break;
case 13: gdate.month = 3; break;
case 1: gdate.month = 4; break;
case 14: gdate.month = 5; break;
case 12: gdate.month = 6; break;
case 11: gdate.month = 7; break;
case 7: gdate.month = 8; break;
case 17: gdate.month = 9; break;
case 16: gdate.month = 10; break;
case 15: gdate.month = 11; break;
case 8: gdate.month = 12; break;
case 2: gdate.day = gdate.day * 10 + ((*p) - '0'); break;
case 3: gdate.hour = gdate.hour * 10 + ((*p) - '0'); break;
case 4: gdate.minute = gdate.minute * 10 + ((*p) - '0'); break;
case 5: gdate.second = gdate.second * 10.0 + ((*p) - '0'); break;
}

_again:
if( cs == 0) { goto _out; }
if(++p != pe) { goto _resume; }
_test_eof: {}
if(p == eof) {
switch(_httpDate_eof_actions[cs]) {
case 19: parsed = 1; break;
case 20: parsed = 1; break;
case 21: parsed = 1; break;
}
}

_out: {}
}

static CFTimeZoneRef gmtTimeZone;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{ gmtTimeZone = CFTimeZoneCreateWithTimeIntervalFromGMT(NULL, 0.0); });

if(parsed == 1) { date = [NSDate dateWithTimeIntervalSinceReferenceDate:CFGregorianDateGetAbsoluteTime(gdate, gmtTimeZone)]; }

return(date);
}


@implementation NSCachedURLResponse(NSCoder)

// supported by Xcode 4.3 and above
Expand Down Expand Up @@ -112,15 +332,6 @@ + (NSString *)cacheKeyForURL:(NSURL *)url {

#pragma mark SDURLCache (private)

static dispatch_queue_t get_date_formatter_queue() {
static dispatch_queue_t _dateFormatterQueue;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_dateFormatterQueue = dispatch_queue_create("com.petersteinberger.disk-cache.dateformatter", NULL);
});
return _dateFormatterQueue;
}

static dispatch_queue_t get_disk_cache_queue() {
static dispatch_once_t onceToken;
static dispatch_queue_t _diskCacheQueue;
Expand Down Expand Up @@ -168,30 +379,17 @@ - (dispatch_source_t)maintenanceTimer {
* Parse HTTP Date: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3.1
*/
+ (NSDate *)dateFromHttpDateString:(NSString *)httpDate {
static dispatch_once_t onceToken;
static NSDateFormatter *_FC1123DateFormatter;
static NSDateFormatter *_ANSICDateFormatter;
static NSDateFormatter *_RFC850DateFormatter;
dispatch_once(&onceToken, ^{
_FC1123DateFormatter = CreateDateFormatter(@"EEE, dd MMM yyyy HH:mm:ss z");
_ANSICDateFormatter = CreateDateFormatter(@"EEE MMM d HH:mm:ss yyyy");
_RFC850DateFormatter = CreateDateFormatter(@"EEEE, dd-MMM-yy HH:mm:ss z");
});

__block NSDate *date = nil;
dispatch_sync(get_date_formatter_queue(), ^{
date = [_FC1123DateFormatter dateFromString:httpDate];
if (!date) {
// ANSI C date format - Sun Nov 6 08:49:37 1994
date = [_ANSICDateFormatter dateFromString:httpDate];
if (!date) {
// RFC 850 date format - Sunday, 06-Nov-94 08:49:37 GMT
date = [_RFC850DateFormatter dateFromString:httpDate];
}
}
});

return date;
char stringBuffer[256];
size_t stringLength = (size_t)CFStringGetLength((CFStringRef)httpDate);
const char *cStringPtr = (const char *)CFStringGetCStringPtr((CFStringRef)httpDate, kCFStringEncodingMacRoman);
if(cStringPtr == NULL) {
CFIndex usedBytes = 0L, convertedCount = 0L;
convertedCount = CFStringGetBytes((CFStringRef)httpDate, CFRangeMake(0L, (CFIndex)stringLength), kCFStringEncodingUTF8, '?', NO, (UInt8 *)stringBuffer, sizeof(stringBuffer) - 1L, &usedBytes);
if(((size_t)convertedCount != stringLength) || (usedBytes < 0L)) { return(NULL); }
stringBuffer[convertedCount] = 0;
cStringPtr = (const char *)stringBuffer;
}
return(_parseHTTPDate(cStringPtr, stringLength));
}

/*
Expand Down Expand Up @@ -568,4 +766,4 @@ - (void)dealloc {
@synthesize diskCachePath = _diskCachePath;
@synthesize diskCacheInfo = _diskCacheInfo;

@end
@end

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