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Commit | Line | Data |
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e3956dfb SP |
1 | #include <stdio.h> |
2 | #include <config.h> | |
3 | ||
4 | #ifdef HAVE_BZLIB | |
5 | #include <bzlib.h> | |
6 | #endif /* HAVE_BZLIB */ | |
7 | ||
8 | #include "transformation.h" | |
9 | ||
10 | /* | |
11 | * Initialize | |
12 | */ | |
13 | static int | |
14 | bzlib_initialize(Transformation *xform, int enc) | |
15 | { | |
16 | return 0; | |
17 | } | |
18 | ||
19 | /* | |
20 | * Shut down. | |
21 | */ | |
22 | static int | |
23 | bzlib_shutdown(Transformation *xform) | |
24 | { | |
25 | return 0; | |
26 | } | |
27 | ||
28 | /* | |
29 | * Handle forks. | |
30 | */ | |
31 | static int | |
32 | bzlib_startNewTape(Transformation *xform, struct tapebuf *tpbin, | |
33 | unsigned long *destlen) | |
34 | { | |
35 | return 0; | |
36 | } | |
37 | ||
38 | /* | |
39 | * Start slave process. | |
40 | */ | |
41 | static int | |
42 | bzlib_startDiskIOProcess(Transformation *xform) | |
43 | { | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* | |
48 | * End slave process. | |
49 | */ | |
50 | static int | |
51 | bzlib_endDiskIOProcess(Transformation *xform) { | |
52 | if (xform != NULL) { | |
53 | free(xform); | |
54 | } | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Compress a buffer. | |
61 | */ | |
62 | static int | |
63 | bzlib_compress(Transformation *xform, struct tapebuf *tpbin, unsigned long *destlen, | |
64 | const char *src, int srclen) { | |
65 | #ifdef HAVE_BZLIB | |
66 | int compresult; | |
67 | unsigned int destlen2 = *destlen; | |
68 | compresult = BZ2_bzBuffToBuffCompress( | |
69 | tpbin->buf, | |
70 | &destlen2, | |
71 | (char *) src, | |
72 | srclen, | |
73 | xform->state.bzlib.complvl, | |
74 | 0, 30); | |
75 | *destlen = destlen2; | |
76 | return compresult == BZ_OK ? 1 : 0; | |
77 | #else | |
78 | return 1; | |
79 | #endif /* HAVE_BZLIB */ | |
80 | } | |
81 | ||
82 | /* | |
83 | * Decompress a buffer. | |
84 | */ | |
85 | static int | |
86 | bzlib_decompress(Transformation *xform, struct tapebuf *tpbin, | |
87 | unsigned long *destlen, const char *src, int srclen, char **reason) { | |
88 | #ifdef HAVE_BZLIB | |
89 | int cresult; | |
90 | unsigned int destlen2 = *destlen; | |
91 | cresult = BZ2_bzBuffToBuffDecompress(tpbin->buf, &destlen2, (char *) src, srclen, | |
92 | 0, 0); | |
93 | *destlen = destlen2; | |
94 | switch (cresult) { | |
95 | case BZ_OK: | |
96 | *reason = ""; | |
97 | break; | |
98 | case BZ_MEM_ERROR: | |
99 | *reason = "not enough memory"; | |
100 | break; | |
101 | case BZ_OUTBUFF_FULL: | |
102 | *reason = "buffer too small"; | |
103 | break; | |
104 | case BZ_DATA_ERROR: | |
105 | case BZ_DATA_ERROR_MAGIC: | |
106 | case BZ_UNEXPECTED_EOF: | |
107 | *reason = "data error"; | |
108 | break; | |
109 | default: | |
110 | *reason = "unknown"; | |
111 | } | |
112 | return (cresult == BZ_OK) ? 1 : 0; | |
113 | #else | |
114 | return 1 | |
115 | #endif | |
116 | } | |
117 | ||
118 | /* | |
119 | * Factory | |
120 | */ | |
121 | Transformation | |
122 | *transformation_bzlib_factory(int enc, int complvl) | |
123 | { | |
124 | Transformation *t = (Transformation *) malloc(sizeof (Transformation)); | |
125 | ||
126 | t->enc = enc; | |
127 | t->state.bzlib.complvl = complvl; | |
128 | ||
129 | t->name = "bzlib"; | |
130 | t->mandatory = 0; | |
131 | t->initialize = &bzlib_initialize; | |
132 | t->shutdown = &bzlib_shutdown; | |
133 | t->startNewTape = &bzlib_startNewTape; | |
134 | t->startDiskIOProcess = &bzlib_startDiskIOProcess; | |
135 | t->endDiskIOProcess = &bzlib_endDiskIOProcess; | |
136 | t->compress = &bzlib_compress; | |
137 | t->decompress = &bzlib_decompress; | |
138 | ||
139 | return t; | |
140 | } |