FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lzio.c

     /*
     ** $Id: lzio.c,v 1.35.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Buffered streams
     ** See Copyright Notice in lua.h
     */
     
     
     #define lzio_c
     #define LUA_CORE
    
    #include <sys/lua/lua.h>
    
    #include "llimits.h"
    #include "lmem.h"
    #include "lstate.h"
    #include "lzio.h"
    
    
    int luaZ_fill (ZIO *z) {
      size_t size;
      lua_State *L = z->L;
      const char *buff;
      lua_unlock(L);
      buff = z->reader(L, z->data, &size);
      lua_lock(L);
      if (buff == NULL || size == 0)
        return EOZ;
      z->n = size - 1;  /* discount char being returned */
      z->p = buff;
      return cast_uchar(*(z->p++));
    }
    
    
    void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
      z->L = L;
      z->reader = reader;
      z->data = data;
      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) {  /* no bytes in buffer? */
          if (luaZ_fill(z) == EOZ)  /* try to read more */
            return n;  /* no more input; return number of missing bytes */
          else {
            z->n++;  /* luaZ_fill consumed first byte; put it back */
            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;
        luaZ_resizebuffer(L, buff, n);
      }
      return buff->buffer;
    }

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