//
// Created by shirome on 19/05/2022.
//

#ifndef ANDROID_HOOKING_PATCHING_TEMPLATE_MAIN_LZIO_H
#define ANDROID_HOOKING_PATCHING_TEMPLATE_MAIN_LZIO_H

#include "lua.h"


#define EOZ     (-1)                    /* end of stream */

typedef struct Zio ZIO;

#define char2int(c)     cast(int, cast(unsigned char, (c)))

#define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))

typedef struct Mbuffer {
    char *buffer;
    size_t n;
    size_t buffsize;
} Mbuffer;

#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)

#define luaZ_buffer(buff)       ((buff)->buffer)
#define luaZ_sizebuffer(buff)   ((buff)->buffsize)
#define luaZ_bufflen(buff)      ((buff)->n)

#define luaZ_resetbuffer(buff) ((buff)->n = 0)


#define luaZ_resizebuffer(L, buff, size) \
        (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
        (buff)->buffsize = size)

#define luaZ_freebuffer(L, buff)        luaZ_resizebuffer(L, buff, 0)


LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
                          void *data);
LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
LUAI_FUNC int luaZ_lookahead (ZIO *z);



/* --------- Private Part ------------------ */

struct Zio {
    size_t n;                     /* bytes still unread */
    const char *p;                /* current position in buffer */
    lua_Reader reader;
    void* data;                   /* additional data */
    lua_State *L;                 /* Lua state (for reader) */
};


LUAI_FUNC int luaZ_fill (ZIO *z);

#endif //ANDROID_HOOKING_PATCHING_TEMPLATE_MAIN_LZIO_H
