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How to find a string in a stream of binary data?


Hello

My code below opens a Word document in binary mode and places the data into
a buffer. I then want to search this buffer for a string. I tried using
strstr but think it stops looking when it reaches first null character or
some control character in data. What C function should I use to be able to
search in a BYTE data buffer?
Code:

#include <stdio.h>

char szPath[MAX_PATH] = "";
strcpy(szPath, "E:\\MyPath\\ah l.doc");
FILE* stream;

FILE *file = fopen(szPath, "rb"); // Open the file
fseek(file, 0, SEEK_END); // Seek to the end
long file_size = ftell(file); // Get the current position
rewind (file); // rewind to start of file

// allocate memory to contain the whole file.
BYTE* byBuffer = (BYTE*) malloc (file_size);
// if (buffer == NULL) exit (2);

// copy the file into the buffer.
fread (byBuffer,1,fil e_size, file);

const char* szFind = "selected";
//strstr(StrToLoo kIn, StrToFind);
char* szResult = strstr((char*)b yBuffer, szFind);

fclose(file); // Close the file

free( byBuffer );
Angus Comber
an***@NOSPAMite loffice.com

Nov 14 '05
10 14642
Angus Comber wrote:
Hello

My code below opens a Word document in binary mode and places the data into
a buffer. I then want to search this buffer for a string. I tried using
strstr but think it stops looking when it reaches first null character or
some control character in data. What C function should I use to be able to
search in a BYTE data buffer?


Use the Aho Corasick algorithm referenced previously in this newsgroup.

Though the discussion doesn't seem to have much to do with the algorithm.

-- glen

Nov 14 '05 #11

This thread has been closed and replies have been disabled. Please start a new discussion.

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