I'm trying to read a png file with read() and open() in C, but all I'm getting is corrupted data. Here is my code :
int r;
int fd;
char buff[4097];
fd = open("image.png", O_RDONLY);
while ((r = read(fd, buff, 4096)) > 0)
{
buff[r] = '\0';
printf("%s", buff);
}
close(fd);
The 8-10 first bytes are the same and then the data is corrupted and doesn't match at all the original image. Thanks for your help
One should not expect to be able to read a binary file and print it as a string. In order to see what is actually in your file, print it as something more suitable for the binary format - say, hex:
int i = 0;
while ((r = read(fd, buff, 4096)) > 0) {
for (int j = 0 ; j != r ; j++ ) {
printf("%02x ", buff[j]);
if (i % 16 == 0) {
printf("\n");
}
i++;
}
}
printf("\n");
Note that this code simply grabs raw bytes from your image file, without making any attempt at interpreting it. Your file may be compressed, too, so trying to interpret it may be a complex task.
