Hex format reading from a file

Hope you understand:

a) this is the wrong newsgroup to post a Computer Science 101 question, and

b) without specifying anything about the file format, delimiters, or even the programming language you're using, you haven't in fact asked a question yet; you've merely stated that you have a problem.

Scott

This is a very common, basic embedded coding task. Assuming you do it by hand and not using some library function:

Read in two 8-bit chars. Convert each to a 4-bit hex nibble (digit) (you will need to handle the numbers and the letters seperately, or use a lookup table) Multiple the first by 0x10 and add it to the second

On systems where you can afford to waste 64kB like that, your int is probably 32 bits.

Or, if you can afford a 64K LUT you could do

int *si = (int *)str; char *hex = someOutputBuffer; while (*si) hex++ = bigLut[*si++];

assuming str is properly terminated with two nulls.

Andrew

Nice catch! Ok, version 2.0:

short *si = (short *)str; char *hex = someOutputBuffer; while (*si) hex++ = bigLut[*si++];