1 files changed, 80 insertions, 0 deletions
diff --git a/src/bin/escpos2raster.c b/src/bin/escpos2raster.c
new file mode 100644
index 0000000..e4c9708
--- /dev/null
+++ b/src/bin/escpos2raster.c
@@ -0,0 +1,80 @@
+#include <escpos/parser.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <err.h>
+
+static FILE*
+fopen_or_die(const char *path, const char *mode)
+{
+   assert(path && mode);
+
+   FILE *f;
+   if (!(f = fopen(path, mode)))
+      err(EXIT_FAILURE, "fopen(%s, %s)", path, mode);
+
+   return f;
+}
+
+struct parser {
+   struct escpos_parser parser;
+   FILE *input, *output;
+};
+
+#define container_of(ptr, type, member) ((type *)((char *)(1 ? (ptr) : &((type *)0)->member) - offsetof(type, member)))
+
+size_t
+escpos_read(const struct escpos_parser *parser, void *ptr, const size_t size)
+{
+   assert(parser && ptr);
+   const struct parser *p = container_of(parser, struct parser, parser);
+   return fread(ptr, 1, size, p->input);
+}
+
+void
+escpos_write(const struct escpos_parser *parser, const uint8_t *ptr, const size_t w, const size_t h)
+{
+   assert(parser && ptr);
+   const struct parser *p = container_of(parser, struct parser, parser);
+   const uint8_t header[] = { 'P', '4', '\n' };
+   fwrite(header, 1, sizeof(header), p->output);
+   fprintf(p->output, "%zu\n", w);
+   fprintf(p->output, "%zu\n", h);
+   for (size_t y = 0; y < h; ++y) {
+      for (size_t x = 0; x < w; x += 8) {
+         uint8_t p8 = 255;
+         for (uint8_t b = 0; b < 8 && x + b < w; ++b)
+            p8 ^= (-(!!ptr[y * w + x + b]) ^ p8) & (1 << (7 - b));
+         fwrite(&p8, 1, 1, p->output);
+      }
+   }
+}
+
+int
+main(int argc, char *argv[])
+{
+   {
+#define CANVAS_W 256
+#define CANVAS_H 1024
+      char window[4096];
+      uint8_t canvas_data[CANVAS_W * CANVAS_H];
+      struct parser p = {
+         .parser = {
+            .read = escpos_read,
+            .write = escpos_write,
+            .canvas = { .data = canvas_data, .w = CANVAS_W, .h = CANVAS_H },
+            .window = { .data = window, sizeof(window) },
+         },
+         .input = (argc >= 2 ? fopen_or_die(argv[1], "rb") : stdin),
+         .output = (argc >= 3 ? fopen_or_die(argv[2], "wb") : stdout),
+      };
+
+      if (!escpos_parser_parse(&p.parser, (argc >= 2 ? argv[1] : "stdin")))
+         exit(EXIT_FAILURE);
+
+      fclose(p.input);
+      fclose(p.output);
+   }
+
+   return EXIT_SUCCESS;
+}