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Author Topic: chunkwrite  (Read 3720 times)

Dakusan

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chunkwrite
« on: January 01, 2010, 03:31:06 AM »

Original post for chunkwrite can be found at https://www.castledragmire.com/Posts/chunkwrite.
Originally posted on: 01/01/10

This is a modification of the utility I made in yesterday’s post, chunk, and most of the information mentioned in that post applies to this one too. This utility instead writes bytes from STDIN to a certain byte offset of a preexisting file. Below is the source code for the result, which I call chunkwrite (Windows Executable).

Chunkwrite writes bytes to a file at a given offset from STDIN. The parameters are:
1) The file to write to
2) The byte offset to write at (hex is supported like 0xA)

The source is as follows:

//Copyright 2009 by Dakusan (http://www.castledragmire.com/Copyright). Licensed under Dakusan License v2.0 (http://www.castledragmire.com/Misc/Software_Licenses/Dakusan_License_v2.0.php).
//See http://www.castledragmire.com/Posts/chunkwrite for more information

#define __LARGE64_FILES
#include <stdio.h>
#include <stdlib.h> //strtoull

#ifdef WIN32 //STDIN only needs to be set to binary mode in windows
   #include <io.h> //_setmode
   #include <fcntl.h> //_O_BINARY
#endif

typedef unsigned long long UINT64;
const UINT64 MaxSizeToRead=1024*1024*10; //The maximum number of bytes to read at a time to our buffer (Must be < 2^31)

UINT64 GetNumberFromString(const char* S) //Extract both hexidecimal and decimal numbers from a string
{
   bool IsHex=S[0]=='0' && (S[1]|32=='x'); //If string starts as 0x, then is a hex number
   return strtoull(S+(IsHex ? 2 : 0), NULL, IsHex ? 16 : 10); //Hex number starts after 2 characters and uses base 16
}

int main(int argc, char *argv[], char *envp[])
{
   //Determine if proper number of parameters are passed, and if not, output help info
   if(argc!=3)
      return fprintf(stderr, "Chunkwrite writes bytes to a file at a given offset from STDIN. The parameters are:\n1) The file to write to\n2) The byte offset to write at (hex is supported like 0xA)\n") & 0;

   //Open the file to output to
   FILE *TheFile=fopen64(argv[1], "r+b");
   if(TheFile==NULL)
      return fprintf(stderr, "File not found or cannot open file\n") & 0;

   //Determine the requested start offset
   UINT64 Offset=GetNumberFromString(argv[2]);

   //Write the data 10MB at a time from STDIN to the file
   char *Buffer=new char[MaxSizeToRead];
   fseeko64(TheFile, Offset, SEEK_SET); //Seek to the beginning write offset of our file
   #ifdef WIN32 //STDIN only needs to be set to binary mode in windows
      _setmode(_fileno(stdin), _O_BINARY);
   #endif
   do
   {
      size_t AmountRead=fread(Buffer, 1, MaxSizeToRead, stdin); //Read the data from STDIN
      fwrite(Buffer, AmountRead, 1, TheFile); //Write the data to the file
   }
   while(!feof(stdin)); //Keep reading and writing until STDIN is complete

   //Cleanup
   delete[] Buffer;
   fclose(TheFile);
   return 1;
}
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