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| 1 | /*
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| 2 | * RowChecker.cc
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| 3 | *
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| 4 | * Created on: Dec 20, 2011
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| 5 | * Author: lyard
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| 6 | */
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| 7 |
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| 8 | #include <fstream>
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| 9 | #include <cstdlib>
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| 10 | #include <iostream>
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| 11 | #include <cstring>
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| 12 | #include <sstream>
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| 13 |
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| 14 | using namespace std;
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| 15 |
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| 16 |
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| 17 | //usage RowChecker <name of file> <size of header> <size of line> <mjdref> <givenLines>
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| 18 | int main(int argc, char** argv)
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| 19 | {
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| 20 |
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| 21 | if (argc < 6)
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| 22 | return 0;
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| 23 |
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| 24 | fstream file(argv[1]);
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| 25 |
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| 26 | int headLen = atoi(argv[2]);
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| 27 | int lineWidth = atoi(argv[3]);
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| 28 | double mjdRef = atof(argv[4]);
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| 29 | int numLines = atoi(argv[5]);
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| 30 |
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| 31 | int totalBytes = headLen;
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| 32 | file.seekp(headLen);
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| 33 |
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| 34 | char* buf = new char[lineWidth];
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| 35 |
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| 36 | double currentTime = 0;
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| 37 | char timeBuf[16];
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| 38 | int realNumRows = 0;
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| 39 |
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| 40 | while (file.read(buf, lineWidth))
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| 41 | {
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| 42 | timeBuf[0] = buf[7];
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| 43 | timeBuf[1] = buf[6];
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| 44 | timeBuf[2] = buf[5];
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| 45 | timeBuf[3] = buf[4];
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| 46 | timeBuf[4] = buf[3];
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| 47 | timeBuf[5] = buf[2];
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| 48 | timeBuf[6] = buf[1];
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| 49 | timeBuf[7] = buf[0];
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| 50 | currentTime = reinterpret_cast<double*>(timeBuf)[0];
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| 51 |
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| 52 | if (realNumRows >= numLines)
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| 53 | {
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| 54 | if (currentTime + mjdRef > 60000 || currentTime + mjdRef < 10000)
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| 55 | break;
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| 56 | if (currentTime + mjdRef > 20000 && currentTime + mjdRef < 50000)
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| 57 | break;
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| 58 | }
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| 59 | //fix the time column if required.
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| 60 | if (currentTime > 50000 && currentTime < 60000)
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| 61 | {
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| 62 | currentTime -= 40587;
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| 63 | reinterpret_cast<double*>(timeBuf)[0] = currentTime;
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| 64 | file.seekp(totalBytes);
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| 65 | file.put(timeBuf[7]);
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| 66 | file.put(timeBuf[6]);
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| 67 | file.put(timeBuf[5]);
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| 68 | file.put(timeBuf[4]);
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| 69 | file.put(timeBuf[3]);
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| 70 | file.put(timeBuf[2]);
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| 71 | file.put(timeBuf[1]);
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| 72 | file.put(timeBuf[0]);
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| 73 | file.seekp(totalBytes + lineWidth);
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| 74 | }
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| 75 |
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| 76 | realNumRows++;
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| 77 | totalBytes += lineWidth;
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| 78 | }
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| 79 | //now update the number of lines of the file
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| 80 | file.close();
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| 81 | file.open(argv[1]);
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| 82 | file.seekp(2880);
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| 83 | delete[] buf;
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| 84 | buf = new char[81];
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| 85 | buf[80] = 0;
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| 86 | bool changeDone = false;
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| 87 | int seeked = 2880;
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| 88 | if (realNumRows == numLines)
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| 89 | changeDone = true;
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| 90 |
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| 91 | while (file.good() && !changeDone)
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| 92 | {
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| 93 | file.read(buf, 80);
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| 94 | string str(buf);
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| 95 |
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| 96 | if (str.substr(0,9) == "NAXIS2 =")
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| 97 | {
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| 98 | ostringstream ss;
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| 99 | ss << realNumRows;
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| 100 | file.seekp(seeked + 30 - ss.str().size());
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| 101 | for (int i=0;i<ss.str().size();i++)
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| 102 | file.put(ss.str()[i]);
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| 103 | changeDone = true;
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| 104 | break;
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| 105 | }
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| 106 | seeked += 80;
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| 107 | }
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| 108 | if (!changeDone)
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| 109 | cout << -1;
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| 110 | else
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| 111 | cout << realNumRows;
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| 112 | file.close();
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| 113 | return realNumRows;
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| 114 | }
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