wip

1 files changed, 838 insertions, 0 deletions

diff --git a/src/bin/fspec/dump.c b/src/bin/fspec/dump.c
new file mode 100644
index 0000000..07a6757
--- /dev/null
+++ b/src/bin/fspec/dump.c
@@ -0,0 +1,838 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <string.h>
+#include <assert.h>
+#include <err.h>
+
+#include <iconv.h>
+#include <errno.h>
+#include <locale.h>
+#include <langinfo.h>
+#include <squash.h>
+
+#include <fspec/bcode.h>
+#include <fspec/lexer.h>
+#include <fspec/validator.h>
+#include "util/membuf.h"
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+#if 0
+
+static size_t
+to_hex(const uint8_t *buf, const size_t buf_sz, char *out, const size_t out_sz, const bool reverse)
+{
+   assert(out);
+   const char nibble[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+   const uint8_t nbs = sizeof(nibble) - 1;
+
+   size_t w = 0, last_non_zero = w;
+   for (size_t i = 0; i < buf_sz && out_sz > 2 && w < out_sz - 2; ++i) {
+      for (uint8_t c = 0; c < CHAR_BIT / 8 && w < out_sz; ++c) {
+         const size_t idx = (reverse ? (buf_sz - 1) - i : i);
+         const uint8_t hi = (buf[idx] >> (4 * (c + 1))) & nbs;
+         const uint8_t lo = (buf[idx] >> (8 * c)) & nbs;
+
+         if (w || hi || lo) {
+            out[w++] = nibble[hi];
+            out[w++] = nibble[lo];
+            last_non_zero = (hi || lo ? w : last_non_zero);
+         }
+      }
+   }
+
+   if (!w) {
+      out[w++] = nibble[0];
+      out[w++] = nibble[0];
+   } else {
+      w = last_non_zero;
+   }
+
+   assert(w < out_sz);
+   out[w] = 0;
+   return w;
+}
+
+static void
+print_dec(const uint8_t *buf, const size_t size, const bool is_signed)
+{
+   char hex[2 * sizeof(fspec_num) + 1];
+   to_hex(buf, size, hex, sizeof(hex), true);
+
+   static_assert(sizeof(fspec_num) <= sizeof(uint64_t), "fspec_num is larger than uint64_t");
+
+   if (is_signed) {
+      printf("%ld", (int64_t)strtoll(hex, NULL, 16));
+   } else {
+      printf("%lu", (uint64_t)strtoull(hex, NULL, 16));
+   }
+}
+
+static void
+print_udec(const uint8_t *buf, const size_t size)
+{
+   print_dec(buf, size, false);
+}
+
+static void
+print_sdec(const uint8_t *buf, const size_t size)
+{
+   print_dec(buf, size, true);
+}
+
+static void
+print_hex(const uint8_t *buf, const size_t size)
+{
+   char hex[2 * sizeof(fspec_num) + 1];
+   to_hex(buf, size, hex, sizeof(hex), true);
+   printf("0x%s", hex);
+}
+
+static void
+print_array(const uint8_t *buf, const size_t size, const size_t nmemb, void (*fun)(const uint8_t *buf, const size_t size))
+{
+   const int indent = 4;
+   if (nmemb > 8) {
+      printf("{\n%*s", indent, "");
+   } else if (nmemb > 1) {
+      printf("{ ");
+   }
+
+   for (size_t n = 0; n < nmemb; ++n) {
+      fun(buf + n * size, size);
+      printf("%s", (nmemb > 1 && n + 1 < nmemb ? ", " : ""));
+
+      if (n + 1 < nmemb && !((n + 1) % 8))
+         printf("\n%*s", indent, "");
+   }
+
+   printf("%s\n", (nmemb > 8 ? "\n}" : (nmemb > 1 ? " }" : "")));
+}
+
+static void
+print_str(const char *buf, const size_t size, const size_t nmemb)
+{
+   const bool has_nl = memchr(buf, '\n', size * nmemb);
+   if (has_nl)
+      puts("```");
+
+   for (size_t n = 0; n < size * nmemb && buf[n] != 0; ++n)
+      printf("%c", buf[n]);
+
+   puts((has_nl ? "```" : ""));
+}
+
+struct code {
+   const enum fspec_op *start, *end, *data;
+};
+
+static void
+dump_ops(const struct code *code)
+{
+   for (const enum fspec_op *op = code->start; op; op = fspec_op_next(op, code->end, false)) {
+      printf("%*s- ", (*op == FSPEC_OP_ARG ? 2 : 0), "");
+      switch (*op) {
+         case FSPEC_OP_HEADER:
+            printf("header\n");
+            break;
+
+         case FSPEC_OP_DECLARATION:
+            printf("declaration\n");
+            break;
+
+         case FSPEC_OP_READ:
+            printf("read\n");
+            break;
+
+         case FSPEC_OP_GOTO:
+            printf("goto\n");
+            break;
+
+         case FSPEC_OP_FILTER:
+            printf("filter\n");
+            break;
+
+         case FSPEC_OP_VISUAL:
+            printf("visual\n");
+            break;
+
+         case FSPEC_OP_ARG:
+            {
+               const enum fspec_arg *arg = (void*)(op + 1);
+               printf("arg ");
+               switch (*arg) {
+                  case FSPEC_ARG_STR:
+                     printf("str %s\n", fspec_arg_get_cstr(arg, code->data));
+                     break;
+
+                  case FSPEC_ARG_VAR:
+                     printf("var %" PRI_FSPEC_NUM "\n", fspec_arg_get_num(arg));
+                     break;
+
+                  case FSPEC_ARG_NUM:
+                     printf("num %" PRI_FSPEC_NUM "\n", fspec_arg_get_num(arg));
+                     break;
+
+                  case FSPEC_ARG_OFF:
+                     printf("off %" PRI_FSPEC_NUM "\n", fspec_arg_get_num(arg));
+                     break;
+
+                  case FSPEC_ARG_DAT:
+                     printf("dat %" PRI_FSPEC_NUM "\n", fspec_arg_get_num(arg));
+                     break;
+
+                  case FSPEC_ARG_EOF:
+                     printf("eof\n");
+                     break;
+
+                  case FSPEC_ARG_LAST:
+                     break;
+               }
+            }
+            break;
+
+         case FSPEC_OP_LAST:
+            break;
+      }
+   }
+}
+
+static const enum fspec_op*
+get_last_struct(const struct code *code)
+{
+   const enum fspec_op *last = NULL;
+   for (const enum fspec_op *op = code->start; op; op = fspec_op_next(op, code->end, true)) {
+      const enum fspec_arg *arg;
+      if (*op == FSPEC_OP_DECLARATION &&
+         (arg = fspec_op_get_arg(op, code->end, 1, 1<<FSPEC_ARG_NUM)) &&
+         fspec_arg_get_num(arg) == FSPEC_DECLARATION_STRUCT) {
+         last = op;
+      }
+   }
+   return last;
+}
+
+struct dynbuf {
+   void *data;
+   size_t len, written;
+};
+
+static inline void
+dynbuf_resize(struct dynbuf *buf, const size_t size)
+{
+   assert(buf);
+   if (!(buf->data = realloc(buf->data, size)))
+      err(EXIT_FAILURE, "realloc(%zu)", size);
+
+   buf->len = size;
+}
+
+static inline void
+dynbuf_resize_if_needed(struct dynbuf *buf, const size_t size)
+{
+   if (buf->len >= size)
+      return;
+
+   dynbuf_resize(buf, size);
+}
+
+static inline void
+dynbuf_grow_if_needed(struct dynbuf *buf, const size_t nmemb)
+{
+   assert(buf);
+   if (buf->len >= nmemb && buf->written <= buf->len - nmemb)
+      return;
+
+   dynbuf_resize(buf, buf->written + nmemb);
+}
+
+static inline void
+dynbuf_append(struct dynbuf *buf, const void *data, const size_t data_sz)
+{
+   dynbuf_grow_if_needed(buf, data_sz);
+   memcpy((char*)buf->data + buf->written, data, data_sz);
+   buf->written += data_sz;
+   assert(buf->written <= buf->len);
+}
+
+static inline void
+dynbuf_reset(struct dynbuf *buf)
+{
+   assert(buf);
+   buf->written = 0;
+}
+
+static inline void
+dynbuf_release(struct dynbuf *buf)
+{
+   assert(buf);
+   free(buf->data);
+   *buf = (struct dynbuf){0};
+}
+
+static void
+display(const void *buf, const size_t size, const size_t nmemb, const bool is_signed, const enum fspec_visual visual)
+{
+   switch (visual) {
+      case FSPEC_VISUAL_NUL:
+         puts("...");
+         break;
+
+      case FSPEC_VISUAL_STR:
+         print_str(buf, size, nmemb);
+         break;
+
+      case FSPEC_VISUAL_HEX:
+         print_array(buf, size, nmemb, print_hex);
+         break;
+
+      case FSPEC_VISUAL_DEC:
+         print_array(buf, size, nmemb, (is_signed ? print_sdec : print_udec));
+         break;
+
+      case FSPEC_VISUAL_LAST:
+         break;
+   }
+}
+
+struct decl {
+   struct dynbuf buf;
+   const char *name;
+   const void *start, *end;
+   size_t nmemb;
+   uint8_t size;
+   enum fspec_visual visual;
+   enum fspec_declaration declaration;
+};
+
+static void
+decl_display(const struct decl *decl)
+{
+   assert(decl);
+   assert(decl->size * decl->nmemb <= decl->buf.len);
+   printf("%s: ", decl->name);
+   display(decl->buf.data, decl->size, decl->nmemb, false, decl->visual);
+}
+
+static fspec_num
+decl_get_num(const struct decl *decl)
+{
+   assert(decl);
+   assert(decl->nmemb == 1);
+   assert(decl->size * decl->nmemb <= decl->buf.len);
+   char hex[2 * sizeof(fspec_num) + 1];
+   to_hex(decl->buf.data, decl->size, hex, sizeof(hex), true);
+   static_assert(sizeof(fspec_num) <= sizeof(uint64_t), "fspec_num is larger than uint64_t");
+   return (fspec_num)strtoull(hex, NULL, 16);
+}
+
+static const char*
+decl_get_cstr(const struct decl *decl)
+{
+   assert(decl);
+   return decl->buf.data;
+}
+
+struct context {
+   struct code code;
+   struct decl *decl;
+   fspec_num decl_count;
+};
+
+static fspec_num
+var_get_num(const struct context *context, const enum fspec_arg *arg)
+{
+   assert(context && arg);
+   return decl_get_num(&context->decl[fspec_arg_get_num(arg)]);
+}
+
+static const char*
+var_get_cstr(const struct context *context, const enum fspec_arg *arg)
+{
+   assert(context && arg);
+   return decl_get_cstr(&context->decl[fspec_arg_get_num(arg)]);
+}
+
+enum type {
+   TYPE_NUM,
+   TYPE_STR,
+};
+
+static enum type
+var_get_type(const struct context *context, const enum fspec_arg *arg)
+{
+   assert(context && arg);
+   const struct decl *decl = &context->decl[fspec_arg_get_num(arg)];
+   switch (decl->visual) {
+      case FSPEC_VISUAL_DEC:
+      case FSPEC_VISUAL_HEX:
+      case FSPEC_VISUAL_NUL:
+         return TYPE_NUM;
+
+      case FSPEC_VISUAL_STR:
+         return TYPE_STR;
+
+      case FSPEC_VISUAL_LAST:
+         break;
+   }
+   return ~0;
+}
+
+static void
+filter_decompress(const struct context *context, struct decl *decl)
+{
+   assert(decl);
+
+   const enum fspec_arg *arg;
+   if (!(arg = fspec_op_get_arg(context->code.start, context->code.end, 2, 1<<FSPEC_ARG_STR)))
+      errx(EXIT_FAILURE, "missing compression");
+
+   SquashCodec *codec;
+   const char *algo = fspec_arg_get_cstr(arg, context->code.data);
+   if (!(codec = squash_get_codec(algo)))
+      errx(EXIT_FAILURE, "unknown compression '%s'", algo);
+
+   SquashOptions *opts;
+   if (!(opts = squash_options_new(codec, NULL)))
+      errx(EXIT_FAILURE, "squash_options_new");
+
+   size_t dsize = squash_codec_get_uncompressed_size(codec, decl->buf.len, decl->buf.data);
+   dsize = (dsize ? dsize : decl->buf.len * 2);
+
+   {
+      const enum fspec_arg *var = arg;
+      if ((arg = fspec_arg_next(arg, context->code.end, 1, 1<<FSPEC_ARG_NUM | 1<<FSPEC_ARG_VAR))) {
+         var = arg;
+
+         switch (*var) {
+            case FSPEC_ARG_NUM:
+               dsize = fspec_arg_get_num(arg);
+               break;
+
+            case FSPEC_ARG_VAR:
+               dsize = var_get_num(context, arg);
+               break;
+
+            default:
+               break;
+         }
+      }
+
+      for (; (var = fspec_arg_next(var, context->code.end, 1, 1<<FSPEC_ARG_STR));) {
+         const char *key = fspec_arg_get_cstr(var, context->code.data);
+         if (!(var = fspec_arg_next(var, context->code.end, 1, ~0)))
+            errx(EXIT_FAILURE, "expected argument for key '%s'", key);
+
+         switch (*var) {
+            case FSPEC_ARG_STR:
+               squash_options_set_string(opts, key, fspec_arg_get_cstr(var, context->code.data));
+               break;
+
+            case FSPEC_ARG_NUM:
+               squash_options_set_int(opts, key, fspec_arg_get_num(var));
+               break;
+
+            case FSPEC_ARG_VAR:
+               if (var_get_type(context, var) == TYPE_STR) {
+                  squash_options_set_string(opts, key, var_get_cstr(context, var));
+               } else {
+                  squash_options_set_int(opts, key, var_get_num(context, var));
+               }
+               break;
+
+            default:
+               break;
+         }
+      }
+   }
+
+   // what a horrible api
+   squash_object_ref(opts);
+
+   SquashStatus r;
+   struct dynbuf buf = {0};
+   dynbuf_resize(&buf, dsize);
+   while ((r = squash_codec_decompress_with_options(codec, &buf.len, buf.data, decl->buf.len, decl->buf.data, opts)) == SQUASH_BUFFER_FULL)
+      dynbuf_resize(&buf, dsize *= 2);
+
+   dynbuf_resize_if_needed(&buf, (buf.written = buf.len));
+   squash_object_unref(opts);
+
+   if (r != SQUASH_OK)
+      errx(EXIT_FAILURE, "squash_codec_decompress(%zu, %zu) = %d: %s", dsize, decl->buf.len, r, squash_status_to_string(r));
+
+   dynbuf_release(&decl->buf);
+   decl->buf = buf;
+   decl->nmemb = buf.len / decl->size;
+}
+
+static void
+filter_decode(const struct context *context, struct decl *decl)
+{
+   assert(decl);
+
+   const enum fspec_arg *arg;
+   if (!(arg = fspec_op_get_arg(context->code.start, context->code.end, 2, 1<<FSPEC_ARG_STR)))
+      errx(EXIT_FAILURE, "missing encoding");
+
+   const char *encoding = fspec_arg_get_cstr(arg, context->code.data);
+
+   static const char *sys_encoding;
+   if (!sys_encoding) {
+      setlocale(LC_ALL, "");
+      sys_encoding = nl_langinfo(CODESET);
+   }
+
+   iconv_t iv;
+   if ((iv = iconv_open(sys_encoding, encoding)) == (iconv_t)-1)
+      err(EXIT_FAILURE, "iconv_open(%s, %s)", sys_encoding, encoding);
+
+   struct dynbuf buf = {0};
+   const uint8_t *in = decl->buf.data;
+   size_t in_left = decl->buf.written;
+   do {
+      char enc[1024], *out = enc;
+      size_t out_left = sizeof(enc);
+
+      errno = 0;
+      if (iconv(iv, (char**)&in, &in_left, &out, &out_left) == (size_t)-1 && errno != E2BIG)
+         err(EXIT_FAILURE, "iconv(%s, %s)", sys_encoding, encoding);
+
+      dynbuf_append(&buf, enc, sizeof(enc) - out_left);
+   } while (in_left > 0);
+
+   iconv_close(iv);
+
+   dynbuf_release(&decl->buf);
+   decl->buf = buf;
+   decl->nmemb = buf.len / decl->size;
+}
+
+static void
+call(const struct context *context, FILE *f)
+{
+   assert(context && f);
+
+   struct decl *decl = NULL;
+   for (const enum fspec_op *op = context->code.start; op; op = fspec_op_next(op, context->code.end, true)) {
+      if (decl && op == decl->end) {
+         decl_display(decl);
+         decl = NULL;
+      }
+
+      switch (*op) {
+         case FSPEC_OP_DECLARATION:
+            {
+               const enum fspec_arg *arg;
+               arg = fspec_op_get_arg(op, context->code.end, 2, 1<<FSPEC_ARG_NUM);
+               decl = &context->decl[fspec_arg_get_num(arg)];
+               dynbuf_reset(&decl->buf);
+            }
+            break;
+
+         case FSPEC_OP_READ:
+            {
+               assert(decl);
+               const enum fspec_arg *arg = fspec_op_get_arg(op, context->code.end, 1, 1<<FSPEC_ARG_NUM);
+               static_assert(CHAR_BIT == 8, "doesn't work otherwere right now");
+               decl->size = fspec_arg_get_num(arg) / 8;
+               decl->nmemb = 0;
+
+               for (const enum fspec_arg *var = arg; (var = fspec_arg_next(var, context->code.end, 1, ~0));) {
+                  switch (*var) {
+                     case FSPEC_ARG_NUM:
+                     case FSPEC_ARG_VAR:
+                        {
+                           const fspec_num v = (*var == FSPEC_ARG_NUM ? fspec_arg_get_num(var) : var_get_num(context, var));
+                           if (v == 0) {
+                              goto noop;
+                           } else if (v > 1) {
+                              const size_t nmemb = (decl->nmemb ? decl->nmemb : 1) * v;
+                              dynbuf_grow_if_needed(&decl->buf, decl->size * nmemb);
+                              const size_t read = fread((char*)decl->buf.data + decl->buf.written, decl->size, nmemb, f);
+                              decl->buf.written += decl->size * read;
+                              decl->nmemb += read;
+                           }
+                        }
+                        break;
+
+                     case FSPEC_ARG_STR:
+                        break;
+
+                     case FSPEC_ARG_EOF:
+                        {
+                           const size_t nmemb = (decl->nmemb ? decl->nmemb : 1);
+                           size_t read = 0, r = nmemb;
+                           while (r == nmemb) {
+                              dynbuf_grow_if_needed(&decl->buf, decl->size * nmemb);
+                              read += (r = fread((char*)decl->buf.data + decl->buf.written, decl->size, nmemb, f));
+                              decl->buf.written += decl->size * r;
+                           };
+                           decl->nmemb += read;
+                        }
+                        break;
+
+                     default:
+                        break;
+                  }
+               }
+noop:
+
+               if (!fspec_arg_next(arg, context->code.end, 1, ~0)) {
+                  dynbuf_grow_if_needed(&decl->buf, decl->size * 1);
+                  const size_t read = fread((char*)decl->buf.data + decl->buf.written, decl->size, 1, f);
+                  decl->buf.written += decl->size * read;
+                  decl->nmemb = read;
+               }
+
+               assert(decl->nmemb != 0);
+            }
+            break;
+
+         case FSPEC_OP_GOTO:
+            {
+               decl = NULL;
+               const enum fspec_arg *arg = fspec_op_get_arg(op, context->code.end, 1, 1<<FSPEC_ARG_VAR);
+               const struct decl *d = &context->decl[fspec_arg_get_num(arg)];
+               struct context c = *context;
+               c.code.start = d->start;
+               c.code.end = d->end;
+
+               for (const enum fspec_arg *var = arg; (var = fspec_arg_next(var, context->code.end, 1, ~0));) {
+                  switch (*var) {
+                     case FSPEC_ARG_NUM:
+                     case FSPEC_ARG_VAR:
+                        {
+                           const fspec_num v = (*var == FSPEC_ARG_NUM ? fspec_arg_get_num(var) : var_get_num(context, var));
+                           for (fspec_num i = 0; i < v; ++i)
+                              call(&c, f);
+                        }
+                        break;
+
+                     // XXX: How to handle STR with stdin?
+                     // With fseek would be easy.
+                     case FSPEC_ARG_STR:
+                        break;
+
+                     case FSPEC_ARG_EOF:
+                        while (!feof(f))
+                           call(&c, f);
+                        break;
+
+                     default:
+                        break;
+                  }
+               }
+
+               if (!fspec_arg_next(arg, context->code.end, 1, ~0))
+                  call(&c, f);
+            }
+            break;
+
+         case FSPEC_OP_FILTER:
+            {
+               assert(decl);
+               const enum fspec_arg *arg = fspec_op_get_arg(op, context->code.end, 1, 1<<FSPEC_ARG_STR);
+
+               const struct {
+                  const char *name;
+                  void (*fun)(const struct context*, struct decl*);
+               } map[] = {
+                  { .name = "encoding", .fun = filter_decode },
+                  { .name = "compression", .fun = filter_decompress },
+               };
+
+               const char *filter = fspec_arg_get_cstr(arg, context->code.data);
+               for (size_t i = 0; i < ARRAY_SIZE(map); ++i) {
+                  if (!strcmp(filter, map[i].name)) {
+                     struct context c = *context;
+                     c.code.start = op;
+                     map[i].fun(&c, decl);
+                     break;
+                  }
+
+                  if (i == ARRAY_SIZE(map) - 1)
+                     warnx("unknown filter '%s'", filter);
+               }
+            }
+            break;
+
+         case FSPEC_OP_VISUAL:
+            {
+               assert(decl);
+               const enum fspec_arg *arg = fspec_op_get_arg(op, context->code.end, 1, 1<<FSPEC_ARG_NUM);
+               decl->visual = fspec_arg_get_num(arg);
+            }
+            break;
+
+         case FSPEC_OP_ARG:
+         case FSPEC_OP_HEADER:
+         case FSPEC_OP_LAST:
+            break;
+      }
+   }
+
+   if (decl && context->code.end == decl->end)
+      decl_display(decl);
+}
+
+static void
+setup(const struct context *context)
+{
+   assert(context);
+
+   for (const enum fspec_op *op = context->code.start; op; op = fspec_op_next(op, context->code.end, true)) {
+      switch (*op) {
+         case FSPEC_OP_DECLARATION:
+            {
+               const enum fspec_arg *arg[4];
+               arg[0] = fspec_op_get_arg(op, context->code.end, 1, 1<<FSPEC_ARG_NUM);
+               arg[1] = fspec_arg_next(arg[0], context->code.end, 1, 1<<FSPEC_ARG_NUM);
+               arg[2] = fspec_arg_next(arg[1], context->code.end, 1, 1<<FSPEC_ARG_OFF);
+               arg[3] = fspec_arg_next(arg[2], context->code.end, 1, 1<<FSPEC_ARG_STR);
+               const fspec_num id = fspec_arg_get_num(arg[1]);
+               struct decl *decl = &context->decl[id];
+               decl->declaration = fspec_arg_get_num(arg[0]);
+               decl->name = fspec_arg_get_cstr(arg[3], context->code.data);
+               decl->visual = FSPEC_VISUAL_DEC;
+               decl->start = op;
+               decl->end = (char*)op + fspec_arg_get_num(arg[2]);
+               assert(!decl->buf.data);
+            }
+            break;
+
+         default:
+            break;
+      }
+   }
+}
+
+static void
+execute(const struct fspec_mem *mem)
+{
+   assert(mem);
+
+   struct context context = {
+      .code.start = mem->data,
+      .code.end = (void*)((char*)mem->data + mem->len),
+      .code.data = mem->data
+   };
+
+   printf("output: %zu bytes\n", mem->len);
+   dump_ops(&context.code);
+
+   const enum fspec_arg *arg = fspec_op_get_arg(context.code.data, context.code.end, 2, 1<<FSPEC_ARG_NUM);
+   context.decl_count = fspec_arg_get_num(arg);
+
+   if (!(context.decl = calloc(context.decl_count, sizeof(*context.decl))))
+      err(EXIT_FAILURE, "calloc(%zu, %zu)", context.decl_count, sizeof(*context.decl));
+
+   setup(&context);
+
+   puts("\nexecution:");
+   context.code.start = get_last_struct(&context.code);
+   assert(context.code.start);
+   call(&context, stdin);
+
+   for (fspec_num i = 0; i < context.decl_count; ++i)
+      dynbuf_release(&context.decl[i].buf);
+
+   free(context.decl);
+}
+#endif
+
+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;
+}
+
+#define container_of(ptr, type, member) ((type *)((char *)(1 ? (ptr) : &((type *)0)->member) - offsetof(type, member)))
+
+struct lexer {
+   struct fspec_lexer lexer;
+   struct membuf output;
+   FILE *file;
+};
+
+static size_t
+fspec_lexer_write(struct fspec_lexer *lexer, const enum fspec_lexer_section section, const void *output, const size_t size, const size_t nmemb)
+{
+   assert(lexer && output);
+   // struct lexer *l = container_of(lexer, struct lexer, lexer);
+   (void)lexer, (void)section, (void)size, (void)nmemb;
+   return nmemb;
+}
+
+static size_t
+fspec_lexer_read(struct fspec_lexer *lexer, void *input, const size_t size, const size_t nmemb)
+{
+   assert(lexer && input);
+   struct lexer *l = container_of(lexer, struct lexer, lexer);
+   return fread(input, size, nmemb, l->file);
+}
+
+#if 0
+static size_t
+fspec_validator_read(struct fspec_validator *validator, void *ptr, const size_t size, const size_t nmemb)
+{
+   assert(validator && ptr);
+   assert(ptr == validator->mem.input.data);
+   const size_t read = validator->mem.input.len / size;
+   assert((validator->mem.input.len && read == nmemb) || (!validator->mem.input.len && !read));
+   validator->mem.input.len -= read * size;
+   assert(validator->mem.input.len == 0);
+   return read;
+}
+#endif
+
+int
+main(int argc, const char *argv[])
+{
+   if (argc < 2)
+      errx(EXIT_FAILURE, "usage: %s file.spec < data", argv[0]);
+
+   char output[4096];
+
+   {
+      char input[4096];
+      struct lexer l = {
+         .lexer = {
+            .ops.read = fspec_lexer_read,
+            .ops.write = fspec_lexer_write,
+            .mem.input = { .data = input, .len = sizeof(input) },
+         },
+         .file = fopen_or_die(argv[1], "rb"),
+         .output.mem = { .data = output, .len = sizeof(output) },
+      };
+
+      if (!fspec_lexer_parse(&l.lexer, argv[1]))
+         exit(EXIT_FAILURE);
+
+      fclose(l.file);
+      // bcode = l.lexer.mem.output;
+   }
+
+#if 0
+
+   {
+      struct fspec_validator validator = {
+         .ops.read = fspec_validator_read,
+         .mem.input = bcode,
+      };
+
+      if (!fspec_validator_parse(&validator, argv[1]))
+         exit(EXIT_FAILURE);
+   }
+
+   execute(&bcode);
+#endif
+   return EXIT_SUCCESS;
+}