src/zio.h

   1 /*
   2 * zio.h
   3 * a generic input stream interface
   4 * $Id: zio.h,v 1.5 1997/06/20 19:25:54 roberto Exp $
   5 */
   6
   7 #ifndef zio_h
   8 #define zio_h
   9
  10 #include <stdio.h>
  11
  12
  13
  14 /* For Lua only */
  15 #define zFopen  luaZ_Fopen
  16 #define zsopen  luaZ_sopen
  17 #define zmopen  luaZ_mopen
  18 #define zread   luaZ_read
  19
  20 #define EOZ     (-1)                    /* end of stream */
  21
  22 typedef struct zio ZIO;
  23
  24 ZIO* zFopen(ZIO* z, FILE* f);           /* open FILEs */
  25 ZIO* zsopen(ZIO* z, char* s);           /* string */
  26 ZIO* zmopen(ZIO* z, char* b, int size); /* memory */
  27
  28 int zread(ZIO* z, void* b, int n);      /* read next n bytes */
  29
  30 #define zgetc(z)        (--(z)->n>=0 ? ((int)*(z)->p++): (z)->filbuf(z))
  31 #define zungetc(z)      (++(z)->n,--(z)->p)
  32
  33
  34
  35 /* --------- Private Part ------------------ */
  36
  37 #define ZBSIZE  256                     /* buffer size */
  38
  39 struct zio {
  40  int n;                                 /* bytes still unread */
  41  unsigned char* p;                      /* current position in buffer */
  42  int (*filbuf)(ZIO* z);
  43  void* u;                               /* additional data */
  44  unsigned char buffer[ZBSIZE];          /* buffer */
  45 };
  46
  47
  48 #endif