lzio.c
资源名称:wow.rar [点击查看]
上传用户:jxpjxmjjw
上传日期:2009-12-07
资源大小:5877k
文件大小:2k
源码类别:
模拟服务器
开发平台:
Visual C++
- /*
- ** $Id: lzio.c,v 1.1 2004/08/20 02:26:56 JH 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;
- }