我需要使用R编辑现有的二进制文件，可以在此处下载二进制文件：https://www.dropbox.com/s/1a4mb6pj5heju4t/CAMTRAP.CTC?dl=0。
原始文件是用C语言编写的，结构如下：
typedef struct {
int8 RTCMonth; // RTC properties used to set camera clock
int8 RTCDay;
int8 RTCHour;
int8 RTCMin;
int8 RTCSec;
int16 RTCYear;
int8 setRTC; // set = 1 to set the RTC using the RTC properties
int8 softwareVersion[51];
int16 flashImagesPerTrigger;
int16 daylightImagesPerTrigger;
int16 delayBetweenImagesFlash;
float delayBetweenImagesDaylight;
int32 imageCounter;
int8 clearImageCounter; // set = 1 to clear image counter
int16 SPARE0;
int8 cameraID[9];
int8 usbBackupMethod; // 0=FULL, 1=INCREMENTAL, 2=FULL PLUS DELETE
int16 flashImageBrightness; // 0=NORMAL, 1=BRIGHT, 2=BRIGHTEST
int8 RESERVED1[32];
int8 RESERVED2;
int8 logFileExtention[3];
int8 SPARE1[3];
int8 RESERVED3;
float flashCrossoverCdS;
int8 setFlashCrossoverCdS; // = 1 to set
float SPARE3;
int8 SPARE4;
float AspectRatio;
int8 setAspectRatio; // = 1 to set
int8 derivativeClipNormal;
int8 setDerivativeClipNormal; // = 1 to set
int8 purgeLogFile; // = 1 to purge log file
int8 SPARE5;
float chargeFlashTarget;
int8 setChargeFlashTarget; // = 1 to set
int8 jpegCompressionRatio; // 12=LOW, 24=MEDIUM, 40=HIGH
int8 setJpegCompressionRatio; // = 1 to set
int8 setExifComment; // = 1 to set
int8 exifComment[50];
//GPS parms and location data
int8 setRTCFromGPS; // = 1 to set
int8 RESERVED4;
int16 utcOffsetHours; // local UTC time adjustment
int16 utcOffsetMinutes;
int8 adjustRtcForDaylightSavings; // set = 1 to enable
int8 daylightSavingsBeginMonth;
int8 daylightSavingsBeginDay;
int8 daylightSavingsEndMonth;
int8 daylightSavingsEndDay;
int8 clearGpsData; // set = 1 to clear GpsData
int32 latitudeRef;
int32 latitudeDegrees;
int32 latitudeMinutes;
int32 latitudeSeconds;
int32 longitudeRef;
int32 longitudeDegrees;
int32 longitudeMinutes;
int32 longitudeSeconds;
int8 altitudeRef;
int32 altFromMSL;
int8 RESERVED5;
int8 setGpsLocation; // = 1 to set
int8 encryptJpgFiles; // set = 1 to enable
int8 RESERVED6;
float bootLoaderVersion;
int8 powerLock; // set = 1 to enable
int8 stealthLedMode; // 0=OFF, 1=No LED indications after initialization, 2=No LED's, extended day, 3=NoLEDs, Extended Day, No Flash Pics
int8 RESERVED7;
float RESERVED8;
float RESERVED9;
int32 V4SPARE0[2];
int8 sdCardCleanup; // = 1 to set
int8 enableTrafficBlocking; // = 1 to set
int8 V4SPARE[22];
int8 serverHostname[40];
int8 serverPort[6];
int8 networkAPN[40];
int8 apnUserID[16];
int8 apnPassword[16];
int8 apnOperNum[9];
int8 hardwareTag[10];
int16 HourForLogUpload; // 0-23 (set > 23 to disable)
int8 FlashlightMode; // = 1 to set
int16 MaxDailyImageUploads;
int8 disableVehicleDetection; // = 1 to set
int8 disableHumanDetection; // = 1 to set
int8 initialLEDactiveMinutes;
int32 RESERVED10;
int8 synchCameraClockWithServer; // = 1 to set
int8 sendImageWithLogFileUpload; // = 1 to set
int8 RESERVED11[545];
}SYS_CONFIG; //1024bytes
我对二进制文件并不熟悉，但根据作者的说法，成员是按照默认成员对齐方式布置的小端（即，有一个填充字节以保持“短”结构成员正确对齐在2字节边界上，这样每当“char”后面的“int”或“short”插入填充字节以保持正确对齐时。
我基本上写了一个Shiny应用程序，它允许用户编辑自己的二进制文件（遵循与示例中相同的结构）。唯一的麻烦是我没有运气这个二进制文件的运气。到目前为止，我已经尝试过使用readBin和writeBin，虽然readBin允许我查看文件的某些方面，但我似乎无法弄清楚这些数据的模式。
我不是在寻找有人为我编写代码，但请有人协助解释如何使用R编辑此特定二进制文件的某些方面。例如，假设我想改变“exifComment”以包含一些随机文本。如何找到二进制文件的该部分，然后应用并保存新数据？这在R？中是否可行？
提前致谢！
PS - 如果我遗漏了任何重要信息，我会道歉，但这就是我必须要处理的事情。