img-cnv.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winpr/image.h>
 
static const int formats[] = { WINPR_IMAGE_BITMAP, WINPR_IMAGE_PNG, WINPR_IMAGE_JPEG,
                             WINPR_IMAGE_WEBP };
 
static void usage(int argc, char* argv[])
{
  const char* prg = "INVALID";
  if (argc > 0)
    prg = argv[0];
 
  (void)fprintf(stdout, "%s <src> <dst>\n", prg);
  (void)fprintf(stdout, "\tConvert image <src> to <dst>\n");
  (void)fprintf(stdout, "\tSupported formats (for this build):\n");
 
  for (size_t x = 0; x < ARRAYSIZE(formats); x++)
  {
    const int format = formats[x];
    const char* ext = winpr_image_format_extension(format);
    const char* mime = winpr_image_format_mime(format);
    const BOOL supported = winpr_image_format_is_supported(format);
    if (supported)
    {
      (void)fprintf(stdout, "\t\t%s [.%s]\n", mime, ext);
    }
  }
}
 
static int detect_format(const char* name)
{
  const char* dot = strrchr(name, '.');
  if (!dot)
  {
    (void)fprintf(stderr, "'%s' does not have a file extension\n", name);
    return -1;
  }
 
  for (size_t x = 0; x < ARRAYSIZE(formats); x++)
  {
    const int format = formats[x];
    const char* ext = winpr_image_format_extension(format);
    const char* mime = winpr_image_format_mime(format);
    const BOOL supported = winpr_image_format_is_supported(format);
    if (strcmp(&dot[1], ext) == 0)
    {
      (void)fprintf(stdout, "'%s' is of format %s [supported:%s]\n", name, mime,
                    supported ? "true" : "false");
      if (!supported)
        return -2;
      return format;
    }
  }
 
  (void)fprintf(stderr, "'%s' is a unsupported format\n", name);
  return -3;
}
 
int main(int argc, char* argv[])
{
  int rc = -4;
  if (argc != 3)
  {
    usage(argc, argv);
    return -1;
  }
 
  const char* src = argv[1];
  const char* dst = argv[2];
 
  const int sfmt = detect_format(src);
  const int dfmt = detect_format(dst);
  if ((sfmt < 0) || (dfmt < 0))
  {
    usage(argc, argv);
    return -2;
  }
 
  wImage* img = winpr_image_new();
  if (!img)
  {
    return -3;
  }
 
  const int rrc = winpr_image_read(img, src);
  if (rrc <= 0)
  {
    (void)fprintf(stderr, "Failed to read image '%s': %d\n", src, rrc);
    goto fail;
  }
  const int wrc = winpr_image_write(img, dst);
  if (wrc <= 0)
  {
    (void)fprintf(stderr, "Failed to write image '%s': %d\n", dst, wrc);
    goto fail;
  }
 
  (void)fprintf(stdout, "Successfully converted '%s' to '%s'\n", src, dst);
  rc = 0;
fail:
  winpr_image_free(img, TRUE);
  return rc;
}