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1 | /* -*-c-*- |
2 | * |
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3 | * Generic hash wrapper for CRC32 |
4 | * |
5 | * (c) 2001 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <mLib/crc32.h> |
31 | #include <mLib/sub.h> |
32 | |
33 | #include "arena.h" |
34 | #include "crc32.h" |
35 | #include "ghash.h" |
36 | #include "paranoia.h" |
37 | |
38 | /*----- Main code ---------------------------------------------------------*/ |
39 | |
40 | typedef struct gctx { |
41 | ghash h; |
42 | uint32 c; |
43 | octet buf[4]; |
44 | } gctx; |
45 | |
46 | static const ghash_ops gops; |
47 | |
48 | static ghash *ghinit(void) |
49 | { |
50 | gctx *g = S_CREATE(gctx); |
51 | g->h.ops = &gops; |
52 | g->c = 0; |
53 | return (&g->h); |
54 | } |
55 | |
56 | static void ghhash(ghash *h, const void *p, size_t sz) |
57 | { |
58 | gctx *g = (gctx *)h; |
59 | CRC32(g->c, g->c, p, sz); |
60 | } |
61 | |
62 | static octet *ghdone(ghash *h, void *buf) |
63 | { |
64 | gctx *g = (gctx *)h; |
65 | if (!buf) |
66 | buf = g->buf; |
67 | STORE32(buf, g->c); |
68 | return (buf); |
69 | } |
70 | |
71 | static void ghdestroy(ghash *h) |
72 | { |
73 | gctx *g = (gctx *)h; |
74 | BURN(*g); |
75 | S_DESTROY(g); |
76 | } |
77 | |
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78 | static ghash *ghcopy(ghash *h) |
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79 | { |
80 | gctx *g = (gctx *)h; |
81 | gctx *gg = S_CREATE(gctx); |
82 | memcpy(gg, g, sizeof(gctx)); |
83 | return (&gg->h); |
84 | } |
85 | |
86 | static const ghash_ops gops = { &gcrc32, ghhash, ghdone, ghdestroy, ghcopy }; |
87 | const gchash gcrc32 = { "crc32", 4, ghinit }; |
88 | |
89 | /*----- That's all, folks -------------------------------------------------*/ |