a generic input stream interface

1 files changed, 49 insertions, 0 deletions

diff --git a/lzio.h b/lzio.h
new file mode 100644
index 00000000..31ce948e
--- /dev/null
+++ b/lzio.h
@@ -0,0 +1,49 @@
+/*
+** $Id: $
+** Buffered streams
+** See Copyright Notice in lua.h
+*/
+
+
+#ifndef lzio_h
+#define lzio_h
+
+#include <stdio.h>
+
+
+
+/* For Lua only */
+#define zFopen  luaZ_Fopen
+#define zsopen  luaZ_sopen
+#define zmopen  luaZ_mopen
+#define zread   luaZ_read
+
+#define EOZ     (-1)                    /* end of stream */
+
+typedef struct zio ZIO;
+
+ZIO* zFopen(ZIO* z, FILE* f);           /* open FILEs */
+ZIO* zsopen(ZIO* z, char* s);           /* string */
+ZIO* zmopen(ZIO* z, char* b, int size); /* memory */
+
+int zread(ZIO* z, void* b, int n);      /* read next n bytes */
+
+#define zgetc(z)        (--(z)->n>=0 ? ((int)*(z)->p++): (z)->filbuf(z))
+#define zungetc(z)      (++(z)->n,--(z)->p)
+
+
+
+/* --------- Private Part ------------------ */
+
+#define ZBSIZE  256                     /* buffer size */
+
+struct zio {
+ int n;                                 /* bytes still unread */
+ unsigned char* p;                      /* current position in buffer */
+ int (*filbuf)(ZIO* z);
+ void* u;                               /* additional data */
+ unsigned char buffer[ZBSIZE];          /* buffer */
+};
+
+
+#endif