Last change
on this file since 2246 was
1810,
checked in by rgrieder, 16 years ago
|
merged ceguilua branch back to trunk
|
-
Property svn:eol-style set to
native
|
File size:
1.6 KB
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Rev | Line | |
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[1806] | 1 | /* |
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| 2 | ** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $ |
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| 3 | ** a generic input stream interface |
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| 4 | ** See Copyright Notice in lua.h |
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| 5 | */ |
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| 6 | |
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| 7 | |
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| 8 | #include <string.h> |
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| 9 | |
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| 10 | #define lzio_c |
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| 11 | #define LUA_CORE |
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| 12 | |
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| 13 | #include "lua.h" |
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| 14 | |
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| 15 | #include "llimits.h" |
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| 16 | #include "lmem.h" |
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| 17 | #include "lstate.h" |
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| 18 | #include "lzio.h" |
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| 19 | |
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| 20 | |
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| 21 | int luaZ_fill (ZIO *z) { |
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| 22 | size_t size; |
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| 23 | lua_State *L = z->L; |
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| 24 | const char *buff; |
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| 25 | lua_unlock(L); |
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| 26 | buff = z->reader(L, z->data, &size); |
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| 27 | lua_lock(L); |
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| 28 | if (buff == NULL || size == 0) return EOZ; |
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| 29 | z->n = size - 1; |
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| 30 | z->p = buff; |
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| 31 | return char2int(*(z->p++)); |
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| 32 | } |
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| 33 | |
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| 34 | |
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| 35 | int luaZ_lookahead (ZIO *z) { |
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| 36 | if (z->n == 0) { |
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| 37 | if (luaZ_fill(z) == EOZ) |
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| 38 | return EOZ; |
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| 39 | else { |
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| 40 | z->n++; /* luaZ_fill removed first byte; put back it */ |
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| 41 | z->p--; |
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| 42 | } |
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| 43 | } |
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| 44 | return char2int(*z->p); |
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| 45 | } |
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| 46 | |
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| 47 | |
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| 48 | void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) { |
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| 49 | z->L = L; |
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| 50 | z->reader = reader; |
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| 51 | z->data = data; |
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| 52 | z->n = 0; |
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| 53 | z->p = NULL; |
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| 54 | } |
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| 55 | |
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| 56 | |
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| 57 | /* --------------------------------------------------------------- read --- */ |
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| 58 | size_t luaZ_read (ZIO *z, void *b, size_t n) { |
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| 59 | while (n) { |
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| 60 | size_t m; |
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| 61 | if (luaZ_lookahead(z) == EOZ) |
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| 62 | return n; /* return number of missing bytes */ |
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| 63 | m = (n <= z->n) ? n : z->n; /* min. between n and z->n */ |
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| 64 | memcpy(b, z->p, m); |
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| 65 | z->n -= m; |
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| 66 | z->p += m; |
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| 67 | b = (char *)b + m; |
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| 68 | n -= m; |
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| 69 | } |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |
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| 73 | /* ------------------------------------------------------------------------ */ |
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| 74 | char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) { |
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| 75 | if (n > buff->buffsize) { |
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| 76 | if (n < LUA_MINBUFFER) n = LUA_MINBUFFER; |
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| 77 | luaZ_resizebuffer(L, buff, n); |
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| 78 | } |
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| 79 | return buff->buffer; |
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| 80 | } |
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| 81 | |
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| 82 | |
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