Originally posted by HyperHacker

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Presumably a really simple question, but I can't seem to find an answer. How can I delete a byte from the middle of a file (in Binary mode, in C)?

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malloc.h>
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>

int deletebyte(const char *filename, int address) {
int size, handle, *data;
FILE *nfo;

handle = open(filename, O_RDONLY); /* getting file size */
size = filelength(handle);
close(handle);

data = malloc(sizeof(int) * size); /* creating data space in memory to store file*/

nfo = fopen(filename, "rb"); /* loading the file */
for(int i = 0; i < size; i++)
data[i] = fgetc(nfo);
fclose(nfo);

for(int i = address + 1; i < size; i++) /* starting at the byte following the specified address */
data[i - 1] = data[i]; /* shifting each byte left */

size--; /* decrementing the size */

nfo = fopen(filename, "wb"); /* reopening the file to write to it */
for(int i = 0; i < size; i++) /* writing to it */
fputc(data[i], nfo);
fclose(nfo);

/* now that we did it, it's time to return our value and free our dynamically allocated array */

free(data);

return size; /* returning our new file size */
}

/* if you want to use this function call it: the first parameter is the file name and the second parameter is the address that you want to delete; the function returns an int, the new filesize of the file. */

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(edited by beneficii on 08-28-05 06:18 AM)
(edited by beneficii on 08-28-05 06:19 AM)
(edited by beneficii on 08-28-05 06:20 AM)
(edited by beneficii on 08-28-05 06:21 AM)
(edited by beneficii on 08-28-05 06:44 AM)