work in progress

1 files changed, 0 insertions, 136 deletions

diff --git a/src/xi/xidec.c b/src/xi/xidec.c
deleted file mode 100644
index 3df917f..0000000
--- a/src/xi/xidec.c
+++ /dev/null
@@ -1,136 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stddef.h>
-#include <stdbool.h>
-#include <string.h>
-#include <assert.h>
-#include <err.h>
-
-static uint8_t
-rotate_right(uint8_t b, const uint8_t count)
-{
-   for (size_t i = 0; i < count; ++i) {
-      const bool drop = ((b & 0x01) == 0x01);
-      b = (b >> 1) | (drop ? 0x80 : 0);
-   }
-   return b;
-}
-
-static void
-decode(uint8_t *data, const size_t size, const uint8_t count)
-{
-   assert(data);
-
-   for (size_t i = 0; i < size; ++i)
-      data[i] = rotate_right(data[i], count);
-}
-
-static size_t
-count_bits(const uint8_t byte)
-{
-   static const uint8_t lut[16] = {
-      0, 1, 1, 2, 1, 2, 2, 3,
-      1, 2, 2, 3, 2, 3, 3, 4
-   };
-
-   return lut[byte & 0x0F] + lut[byte >> 4];
-}
-
-static uint8_t
-text_rotation(const uint8_t *data, const size_t size)
-{
-   assert(data);
-
-   if (size < 2 || (data[0] == 0 && data[1] == 0))
-      return 0;
-
-   const int seed = count_bits(data[1]) - count_bits(data[0]);
-   switch (abs(seed) % 5) {
-      case 0: return 1;
-      case 1: return 7;
-      case 2: return 2;
-      case 3: return 6;
-      case 4: return 3;
-      default:break;
-   }
-
-   assert(0 && "failed to detect rotation");
-   return 0;
-}
-
-static uint8_t
-other_rotation(const uint8_t *data, const size_t size)
-{
-   assert(data);
-
-   if (size < 13)
-      return 0;
-
-   const int seed = count_bits(data[2]) - count_bits(data[11]) + count_bits(data[12]);
-   switch (abs(seed) % 5) {
-      case 0: return 7;
-      case 1: return 1;
-      case 2: return 6;
-      case 3: return 2;
-      case 4: return 5;
-      default:break;
-   }
-
-   assert(0 && "failed to detect rotation");
-   return 0;
-}
-
-static uint8_t
-item_rotation(const uint8_t *data, const size_t size)
-{
-   assert(data);
-   (void)data, (void)size;
-   return 5;
-}
-
-int
-main(int argc, char *argv[])
-{
-   if (argc < 2)
-      errx(EXIT_FAILURE, "usage: %s (name | ability | spell | item | text) < data\n", argv[0]);
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
-
-   const struct info {
-      const char *name;
-      size_t chunk;
-      uint8_t (*rotation)(const uint8_t *data, const size_t size);
-   } map[] = {
-      { .name = "name", .chunk = 32 },
-      { .name = "ability", .chunk = 1024, .rotation = other_rotation },
-      { .name = "spell", .chunk = 1024, .rotation = other_rotation },
-      { .name = "item",  .chunk = 3072, .rotation = item_rotation },
-      { .name = "text",  .chunk = 255, .rotation = text_rotation },
-   };
-
-   const struct info *info = NULL;
-   for (size_t i = 0; i < ARRAY_SIZE(map); ++i) {
-      if (strcmp(map[i].name, argv[1]))
-         continue;
-
-      info = &map[i];
-      break;
-   }
-
-   if (!info)
-      errx(EXIT_FAILURE, "unknown file type '%s'", argv[1]);
-
-   uint8_t buf[4096];
-   assert(sizeof(buf) >= info->chunk);
-
-   size_t bytes;
-   while ((bytes = fread(buf, 1, info->chunk, stdin)) > 0) {
-      if (info->rotation)
-         decode(buf, bytes, info->rotation(buf, bytes));
-
-      fwrite(buf, 1, bytes, stdout);
-   }
-
-   return EXIT_SUCCESS;
-}