lisiblepng-bin/src/main.c


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#include <errno.h>
#include <lisiblepng.h>
#include <stdio.h>
#include <string.h>

#define LOG0(msg) fprintf(stderr, msg "\n")
#define LOGN(fmt, ...) fprintf(stderr, fmt "\n", __VA_ARGS__)

int main(int argc, char **argv) {
  if (argc != 2) {
    LOG0("Usage: lisiblepng <png filepath>");
    return 1;
  }

  const char *png_filepath = argv[1];
  FILE *png_file = fopen(png_filepath, "r");
  fseek(png_file, 0, SEEK_END);
  long file_size = ftell(png_file);
  LOGN("File size: %ld bytes", file_size);
  fseek(png_file, 0, SEEK_SET);

  if (!png_file) {
    const char *error_message = strerror(errno);
    LOGN("Couldn't open PNG file: %s", error_message);
    return 1;
  }

  LisPng *png = LisPng_decode(png_file);
  if (!png) {
    LOG0("Couldn't decode PNG");
    return 1;
  }

  LisPng_dump_ppm(png);
  LisPng_destroy(png);

  if (fclose(png_file) != 0) {
    const char *error_message = strerror(errno);
    LOGN("Couldn't close PNG file: %s", error_message);
    return 1;
  }

  return 0;
}