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** $Id: lzio.c,v 1.35 2012/05/14 13:34:18 roberto Exp $
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** See Copyright Notice in lua.h
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int luaZ_fill (ZIO *z) {
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buff = z->reader(L, z->data, &size);
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if (buff == NULL || size == 0)
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z->n = size - 1; /* discount char being returned */
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return cast_uchar(*(z->p++));
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void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
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/* --------------------------------------------------------------- read --- */
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size_t luaZ_read (ZIO *z, void *b, size_t n) {
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if (z->n == 0) { /* no bytes in buffer? */
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if (luaZ_fill(z) == EOZ) /* try to read more */
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return n; /* no more input; return number of missing bytes */
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z->n++; /* luaZ_fill consumed first byte; put it back */
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m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
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/* ------------------------------------------------------------------------ */
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char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
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if (n > buff->buffsize) {
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if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
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luaZ_resizebuffer(L, buff, n);