Use fixed length data types in header, for portability

[gingerbeardman]

Fixes #2

Problem

• Old code assumes 4-byte (32-bit) long data type.
• For me, on macOS with gcc or clang, long data type is 8-byte (64-bit).

Solution

• So with regards to code that generates the bitmap header, I replace:
  • long with int32_t
  • unsigned long with u_int32_t
• This results in correct output.

Working 64-bit macOS binary

• bdf2bmp.zip
• you may need to chmod +x ./bdf2bmp

Thanks for this utility!

[leovilok]

@gingerbeardman to use uint32_t you need to:

#include <stdint.h>

<sys/types.h> is already included, and it provides int32_t, but not uint32_t (provides u_int32_t instead). Tested on Linux + gcc 9.3.

[gingerbeardman]

@leovilok Thanks for that - much appreciated! I have changed the code to use u_int32_t as you suggested. Updated macOS binary at the link above.