1 files changed, 90 insertions, 0 deletions
diff --git a/.repos/farbfeld/jpg2ff.c b/.repos/farbfeld/jpg2ff.c
new file mode 100644
index 0000000..360ace4
--- /dev/null
+++ b/.repos/farbfeld/jpg2ff.c
@@ -0,0 +1,90 @@
+/* See LICENSE file for copyright and license details. */
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <jpeglib.h>
+
+#include "util.h"
+
+static void
+jpeg_error(j_common_ptr js)
+{
+	fprintf(stderr, "%s: libjpeg: ", argv0);
+	(*js->err->output_message)(js);
+	exit(1);
+}
+
+static void
+jpeg_setup_reader(struct jpeg_decompress_struct *s, struct jpeg_error_mgr *e,
+                  uint32_t *w, uint32_t *h)
+{
+	jpeg_create_decompress(s);
+	e->error_exit = jpeg_error;
+	s->err = jpeg_std_error(e);
+
+	jpeg_stdio_src(s, stdin);
+	jpeg_read_header(s, 1);
+	*w = s->image_width;
+	*h = s->image_height;
+	s->output_components = 3;     /* color components per pixel */
+	s->out_color_space = JCS_RGB; /* input color space */
+
+	jpeg_start_decompress(s);
+}
+
+static void
+usage(void)
+{
+	die("usage: %s", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct jpeg_decompress_struct js;
+	struct jpeg_error_mgr jerr;
+	uint32_t width, height;
+	uint16_t *row;
+	uint8_t *rowin;
+	size_t rowlen, i;
+
+	/* arguments */
+	argv0 = argv[0], argc--, argv++;
+
+	if (argc) {
+		usage();
+	}
+
+	/* prepare */
+	jpeg_setup_reader(&js, &jerr, &width, &height);
+	row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t));
+	rowlen = width * (sizeof("RGBA") - 1);
+	rowin = ereallocarray(NULL, width, (sizeof("RGB") - 1) * sizeof(uint8_t));
+
+	/* write data */
+	ff_write_header(width, height);
+
+	while (js.output_scanline < js.output_height) {
+		jpeg_read_scanlines(&js, &rowin, 1);
+
+		for (i = 0; i < width; ++i) {
+			row[4 * i + 0] = htons(rowin[3 * i + 0] * 257);
+			row[4 * i + 1] = htons(rowin[3 * i + 1] * 257);
+			row[4 * i + 2] = htons(rowin[3 * i + 2] * 257);
+			row[4 * i + 3] = htons(65535);
+		}
+
+		efwrite(row, sizeof(uint16_t), rowlen, stdout);
+	}
+
+	/* clean up */
+	jpeg_finish_decompress(&js);
+	jpeg_destroy_decompress(&js);
+
+	return fshut(stdout, "<stdout>");
+}