Mercurial > vba-linux
annotate src/lua/src/lzio.c @ 1:f9f4f1b99eed
importing src directory
| author | Robert McIntyre <rlm@mit.edu> |
|---|---|
| date | Sat, 03 Mar 2012 10:31:27 -0600 |
| parents | |
| children |
| rev | line source |
|---|---|
| rlm@1 | 1 /* |
| rlm@1 | 2 ** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $ |
| rlm@1 | 3 ** a generic input stream interface |
| rlm@1 | 4 ** See Copyright Notice in lua.h |
| rlm@1 | 5 */ |
| rlm@1 | 6 |
| rlm@1 | 7 |
| rlm@1 | 8 #include <string.h> |
| rlm@1 | 9 |
| rlm@1 | 10 #define lzio_c |
| rlm@1 | 11 #define LUA_CORE |
| rlm@1 | 12 |
| rlm@1 | 13 #include "lua.h" |
| rlm@1 | 14 |
| rlm@1 | 15 #include "llimits.h" |
| rlm@1 | 16 #include "lmem.h" |
| rlm@1 | 17 #include "lstate.h" |
| rlm@1 | 18 #include "lzio.h" |
| rlm@1 | 19 |
| rlm@1 | 20 |
| rlm@1 | 21 int luaZ_fill (ZIO *z) { |
| rlm@1 | 22 size_t size; |
| rlm@1 | 23 lua_State *L = z->L; |
| rlm@1 | 24 const char *buff; |
| rlm@1 | 25 lua_unlock(L); |
| rlm@1 | 26 buff = z->reader(L, z->data, &size); |
| rlm@1 | 27 lua_lock(L); |
| rlm@1 | 28 if (buff == NULL || size == 0) return EOZ; |
| rlm@1 | 29 z->n = size - 1; |
| rlm@1 | 30 z->p = buff; |
| rlm@1 | 31 return char2int(*(z->p++)); |
| rlm@1 | 32 } |
| rlm@1 | 33 |
| rlm@1 | 34 |
| rlm@1 | 35 int luaZ_lookahead (ZIO *z) { |
| rlm@1 | 36 if (z->n == 0) { |
| rlm@1 | 37 if (luaZ_fill(z) == EOZ) |
| rlm@1 | 38 return EOZ; |
| rlm@1 | 39 else { |
| rlm@1 | 40 z->n++; /* luaZ_fill removed first byte; put back it */ |
| rlm@1 | 41 z->p--; |
| rlm@1 | 42 } |
| rlm@1 | 43 } |
| rlm@1 | 44 return char2int(*z->p); |
| rlm@1 | 45 } |
| rlm@1 | 46 |
| rlm@1 | 47 |
| rlm@1 | 48 void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) { |
| rlm@1 | 49 z->L = L; |
| rlm@1 | 50 z->reader = reader; |
| rlm@1 | 51 z->data = data; |
| rlm@1 | 52 z->n = 0; |
| rlm@1 | 53 z->p = NULL; |
| rlm@1 | 54 } |
| rlm@1 | 55 |
| rlm@1 | 56 |
| rlm@1 | 57 /* --------------------------------------------------------------- read --- */ |
| rlm@1 | 58 size_t luaZ_read (ZIO *z, void *b, size_t n) { |
| rlm@1 | 59 while (n) { |
| rlm@1 | 60 size_t m; |
| rlm@1 | 61 if (luaZ_lookahead(z) == EOZ) |
| rlm@1 | 62 return n; /* return number of missing bytes */ |
| rlm@1 | 63 m = (n <= z->n) ? n : z->n; /* min. between n and z->n */ |
| rlm@1 | 64 memcpy(b, z->p, m); |
| rlm@1 | 65 z->n -= m; |
| rlm@1 | 66 z->p += m; |
| rlm@1 | 67 b = (char *)b + m; |
| rlm@1 | 68 n -= m; |
| rlm@1 | 69 } |
| rlm@1 | 70 return 0; |
| rlm@1 | 71 } |
| rlm@1 | 72 |
| rlm@1 | 73 /* ------------------------------------------------------------------------ */ |
| rlm@1 | 74 char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) { |
| rlm@1 | 75 if (n > buff->buffsize) { |
| rlm@1 | 76 if (n < LUA_MINBUFFER) n = LUA_MINBUFFER; |
| rlm@1 | 77 luaZ_resizebuffer(L, buff, n); |
| rlm@1 | 78 } |
| rlm@1 | 79 return buff->buffer; |
| rlm@1 | 80 } |
| rlm@1 | 81 |
| rlm@1 | 82 |