1 files changed, 81 insertions, 0 deletions
diff --git a/lua/lzio.c b/lua/lzio.c
new file mode 100644
index 000000000..864592b45
--- /dev/null
+++ b/lua/lzio.c
@@ -0,0 +1,81 @@
+/*
+** $Id: lzio.c,v 1.1 2004/03/16 21:58:30 niemeyer Exp $
+** a generic input stream interface
+** See Copyright Notice in lua.h
+*/
+
+
+#include <string.h>
+
+#define lzio_c
+
+#include "lua.h"
+
+#include "llimits.h"
+#include "lmem.h"
+#include "lzio.h"
+
+
+int luaZ_fill (ZIO *z) {
+  size_t size;
+  const char *buff = z->reader(NULL, z->data, &size);
+  if (buff == NULL || size == 0) return EOZ;
+  z->n = size - 1;
+  z->p = buff;
+  return char2int(*(z->p++));
+}
+
+
+int luaZ_lookahead (ZIO *z) {
+  if (z->n == 0) {
+    int c = luaZ_fill(z);
+    if (c == EOZ) return c;
+    z->n++;
+    z->p--;
+  }
+  return char2int(*z->p);
+}
+
+
+void luaZ_init (ZIO *z, lua_Chunkreader reader, void *data, const char *name) {
+  z->reader = reader;
+  z->data = data;
+  z->name = name;
+  z->n = 0;
+  z->p = NULL;
+}
+
+
+/* --------------------------------------------------------------- read --- */
+size_t luaZ_read (ZIO *z, void *b, size_t n) {
+  while (n) {
+    size_t m;
+    if (z->n == 0) {
+      if (luaZ_fill(z) == EOZ)
+        return n;  /* return number of missing bytes */
+      else {
+        ++z->n;  /* filbuf removed first byte; put back it */
+        --z->p;
+      }
+    }
+    m = (n <= z->n) ? n : z->n;  /* min. between n and z->n */
+    memcpy(b, z->p, m);
+    z->n -= m;
+    z->p += m;
+    b = (char *)b + m;
+    n -= m;
+  }
+  return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
+  if (n > buff->buffsize) {
+    if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
+    luaM_reallocvector(L, buff->buffer, buff->buffsize, n, char);
+    buff->buffsize = n;
+  }
+  return buff->buffer;
+}
+
+