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e3956dfb SP |
1 | #include <stdio.h> |
2 | #include <config.h> | |
3 | ||
4 | #ifdef HAVE_ZLIB | |
5 | #include <zlib.h> | |
6 | #endif /* HAVE_ZLIB */ | |
7 | ||
8 | #include "transformation.h" | |
9 | ||
10 | /* | |
11 | * Initialize | |
12 | */ | |
13 | static int | |
14 | zlib_initialize(Transformation *xform) | |
15 | { | |
16 | return 0; | |
17 | } | |
18 | ||
19 | /* | |
20 | * Shut down. | |
21 | */ | |
22 | static int | |
23 | zlib_shutdown(Transformation *xform) | |
24 | { | |
25 | return 0; | |
26 | } | |
27 | ||
28 | /* | |
29 | * Handle forks. | |
30 | */ | |
31 | static int | |
32 | zlib_startNewTape(Transformation *xform, struct tapebuf *bin, | |
33 | unsigned long *destlen) | |
34 | { | |
35 | return 0; | |
36 | } | |
37 | ||
38 | /* | |
39 | * Start slave process | |
40 | */ | |
41 | static int | |
42 | zlib_startDiskIOProcess(Transformation *xform) | |
43 | { | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* | |
48 | * End slave process | |
49 | */ | |
50 | static int | |
51 | zlib_endDiskIOProcess(Transformation *xform) | |
52 | { | |
53 | if (xform != NULL) { | |
54 | free(xform); | |
55 | } | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | struct req { | |
61 | ext2_loff_t dblk; | |
62 | int count; | |
63 | }; | |
64 | ||
65 | /* | |
66 | * Compress a buffer. | |
67 | */ | |
68 | static int | |
69 | zlib_compress(Transformation *xform, struct tapebuf *tpbin, | |
70 | unsigned long *destlen, const char *src, int srclen) | |
71 | { | |
72 | #ifdef HAVE_ZLIB | |
73 | int compresult; | |
74 | compresult = compress2(tpbin->buf, destlen, src, srclen, xform->state.zlib.complvl); | |
75 | return compresult == Z_OK ? 1 : 0; | |
76 | #else | |
77 | return 1; | |
78 | #endif /* HAVE_ZLIB */ | |
79 | } | |
80 | ||
81 | /* | |
82 | * Decompress a buffer. | |
83 | */ | |
84 | static int | |
85 | zlib_decompress(Transformation *xform, struct tapebuf *tpbin, | |
86 | unsigned long *destlen, const char *src, int srclen, char **reason) | |
87 | { | |
88 | #ifdef HAVE_ZLIB | |
89 | int cresult; | |
90 | cresult = uncompress(tpbin->buf, destlen, src, srclen); | |
91 | switch (cresult) { | |
92 | case Z_OK: | |
93 | *reason = ""; | |
94 | break; | |
95 | case Z_MEM_ERROR: | |
96 | *reason = "not enough memory"; | |
97 | break; | |
98 | case Z_BUF_ERROR: | |
99 | *reason = "buffer too small"; | |
100 | break; | |
101 | case Z_DATA_ERROR: | |
102 | *reason = "data error"; | |
103 | break; | |
104 | default: | |
105 | *reason = "unknown"; | |
106 | } | |
107 | return (cresult == Z_OK) ? 1 : 0; | |
108 | #else | |
109 | return 1; | |
110 | #endif /* HAVE_ZLIB */ | |
111 | } | |
112 | ||
113 | ||
114 | /* | |
115 | * Factory | |
116 | */ | |
117 | Transformation | |
118 | *transformation_zlib_factory(int enc, int complvl) | |
119 | { | |
120 | Transformation *t = (Transformation *) malloc(sizeof (Transformation)); | |
121 | ||
122 | t->enc = enc; | |
123 | t->state.zlib.complvl = complvl; | |
124 | ||
125 | t->name = "zlib"; | |
126 | t->mandatory = 0; | |
127 | t->initialize = &zlib_initialize; | |
128 | t->shutdown = &zlib_shutdown; | |
129 | t->startNewTape = &zlib_startNewTape; | |
130 | t->startDiskIOProcess = &zlib_startDiskIOProcess; | |
131 | t->endDiskIOProcess = &zlib_endDiskIOProcess; | |
132 | t->compress = &zlib_compress; | |
133 | t->decompress = &zlib_decompress; | |
134 | ||
135 | return t; | |
136 | } |