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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ios/chrome/browser/geolocation/CLLocation+XGeoHeader.h"
#include <stdint.h>
#import "third_party/google_toolbox_for_mac/src/Foundation/GTMStringEncoding.h"
NSString* const kGMOLocationDescriptorFormat =
@"role: CURRENT_LOCATION\n"
@"producer: DEVICE_LOCATION\n"
@"timestamp: %lld\n"
@"radius: %ld\n"
@"latlng <\n"
@" latitude_e7: %.f\n"
@" longitude_e7: %.f\n"
@">";
@implementation CLLocation (XGeoHeader)
- (NSString*)cr_serializeStringToWebSafeBase64String:(NSString*)data {
GTMStringEncoding* encoder =
[GTMStringEncoding rfc4648Base64WebsafeStringEncoding];
NSString* base64 =
[encoder encode:[data dataUsingEncoding:NSUTF8StringEncoding]];
if (base64) {
return base64;
} else {
return @"";
}
}
// Returns the timestamp of this location in microseconds since the UNIX epoch.
// Returns 0 if the timestamp is unavailable or invalid.
- (int64_t)cr_timestampInMicroseconds {
NSTimeInterval seconds = [self.timestamp timeIntervalSince1970];
if (seconds > 0) {
const int64_t kSecondsToMicroseconds = 1000000;
return (int64_t)(seconds * kSecondsToMicroseconds);
}
return 0;
}
// Returns the horizontal accuracy radius of |location|. The smaller the value,
// the more accurate the location. A value -1 is returned if accuracy is
// unavailable.
- (long)cr_accuracyInMillimeters {
const long kMetersToMillimeters = 1000;
if (self.horizontalAccuracy > 0) {
return (long)(self.horizontalAccuracy * kMetersToMillimeters);
}
return -1L;
}
// Returns the LocationDescriptor as an ASCII proto.
- (NSString*)cr_locationDescriptor {
// Construct the location descriptor using its format string.
return [NSString stringWithFormat:kGMOLocationDescriptorFormat,
[self cr_timestampInMicroseconds],
[self cr_accuracyInMillimeters],
floor(self.coordinate.latitude * 1e7),
floor(self.coordinate.longitude * 1e7)];
}
- (NSString*)cr_xGeoString {
NSString* locationDescriptor = [self cr_locationDescriptor];
// The "a" indicates that it is an ASCII proto.
return [NSString
stringWithFormat:@"a %@", [self cr_serializeStringToWebSafeBase64String:
locationDescriptor]];
}
@end
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