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116a02e3 JG |
1 | /* |
2 | * MessagePack for C deflate buffer implementation | |
3 | * | |
4 | * Copyright (C) 2010 FURUHASHI Sadayuki | |
5 | * | |
6 | * Distributed under the Boost Software License, Version 1.0. | |
7 | * (See accompanying file LICENSE_1_0.txt or copy at | |
8 | * http://www.boost.org/LICENSE_1_0.txt) | |
9 | */ | |
10 | #ifndef MSGPACK_ZBUFFER_H | |
11 | #define MSGPACK_ZBUFFER_H | |
12 | ||
13 | #include "sysdep.h" | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <zlib.h> | |
17 | ||
18 | #ifdef __cplusplus | |
19 | extern "C" { | |
20 | #endif | |
21 | ||
22 | ||
23 | /** | |
24 | * @defgroup msgpack_zbuffer Compressed buffer | |
25 | * @ingroup msgpack_buffer | |
26 | * @{ | |
27 | */ | |
28 | ||
29 | typedef struct msgpack_zbuffer { | |
30 | z_stream stream; | |
31 | char* data; | |
32 | size_t init_size; | |
33 | } msgpack_zbuffer; | |
34 | ||
35 | #ifndef MSGPACK_ZBUFFER_INIT_SIZE | |
36 | #define MSGPACK_ZBUFFER_INIT_SIZE 8192 | |
37 | #endif | |
38 | ||
39 | static inline bool msgpack_zbuffer_init( | |
40 | msgpack_zbuffer* zbuf, int level, size_t init_size); | |
41 | static inline void msgpack_zbuffer_destroy(msgpack_zbuffer* zbuf); | |
42 | ||
43 | static inline msgpack_zbuffer* msgpack_zbuffer_new(int level, size_t init_size); | |
44 | static inline void msgpack_zbuffer_free(msgpack_zbuffer* zbuf); | |
45 | ||
46 | static inline char* msgpack_zbuffer_flush(msgpack_zbuffer* zbuf); | |
47 | ||
48 | static inline const char* msgpack_zbuffer_data(const msgpack_zbuffer* zbuf); | |
49 | static inline size_t msgpack_zbuffer_size(const msgpack_zbuffer* zbuf); | |
50 | ||
51 | static inline bool msgpack_zbuffer_reset(msgpack_zbuffer* zbuf); | |
52 | static inline void msgpack_zbuffer_reset_buffer(msgpack_zbuffer* zbuf); | |
53 | static inline char* msgpack_zbuffer_release_buffer(msgpack_zbuffer* zbuf); | |
54 | ||
55 | ||
56 | #ifndef MSGPACK_ZBUFFER_RESERVE_SIZE | |
57 | #define MSGPACK_ZBUFFER_RESERVE_SIZE 512 | |
58 | #endif | |
59 | ||
60 | static inline int msgpack_zbuffer_write(void* data, const char* buf, size_t len); | |
61 | ||
62 | static inline bool msgpack_zbuffer_expand(msgpack_zbuffer* zbuf); | |
63 | ||
64 | ||
65 | static inline bool msgpack_zbuffer_init(msgpack_zbuffer* zbuf, | |
66 | int level, size_t init_size) | |
67 | { | |
68 | memset(zbuf, 0, sizeof(msgpack_zbuffer)); | |
69 | zbuf->init_size = init_size; | |
70 | if(deflateInit(&zbuf->stream, level) != Z_OK) { | |
71 | free(zbuf->data); | |
72 | return false; | |
73 | } | |
74 | return true; | |
75 | } | |
76 | ||
77 | static inline void msgpack_zbuffer_destroy(msgpack_zbuffer* zbuf) | |
78 | { | |
79 | deflateEnd(&zbuf->stream); | |
80 | free(zbuf->data); | |
81 | } | |
82 | ||
83 | static inline msgpack_zbuffer* msgpack_zbuffer_new(int level, size_t init_size) | |
84 | { | |
85 | msgpack_zbuffer* zbuf = (msgpack_zbuffer*)malloc(sizeof(msgpack_zbuffer)); | |
86 | if (zbuf == NULL) return NULL; | |
87 | if(!msgpack_zbuffer_init(zbuf, level, init_size)) { | |
88 | free(zbuf); | |
89 | return NULL; | |
90 | } | |
91 | return zbuf; | |
92 | } | |
93 | ||
94 | static inline void msgpack_zbuffer_free(msgpack_zbuffer* zbuf) | |
95 | { | |
96 | if(zbuf == NULL) { return; } | |
97 | msgpack_zbuffer_destroy(zbuf); | |
98 | free(zbuf); | |
99 | } | |
100 | ||
101 | static inline bool msgpack_zbuffer_expand(msgpack_zbuffer* zbuf) | |
102 | { | |
103 | size_t used = (size_t)((char *)(zbuf->stream.next_out) - zbuf->data); | |
104 | size_t csize = used + zbuf->stream.avail_out; | |
105 | ||
106 | size_t nsize = (csize == 0) ? zbuf->init_size : csize * 2; | |
107 | ||
108 | char* tmp = (char*)realloc(zbuf->data, nsize); | |
109 | if(tmp == NULL) { | |
110 | return false; | |
111 | } | |
112 | ||
113 | zbuf->data = tmp; | |
114 | zbuf->stream.next_out = (Bytef*)(tmp + used); | |
115 | zbuf->stream.avail_out = (uInt)(nsize - used); | |
116 | ||
117 | return true; | |
118 | } | |
119 | ||
120 | static inline int msgpack_zbuffer_write(void* data, const char* buf, size_t len) | |
121 | { | |
122 | msgpack_zbuffer* zbuf = (msgpack_zbuffer*)data; | |
123 | ||
124 | zbuf->stream.next_in = (Bytef*)buf; | |
125 | zbuf->stream.avail_in = (uInt)len; | |
126 | ||
127 | while(zbuf->stream.avail_in > 0) { | |
128 | if(zbuf->stream.avail_out < MSGPACK_ZBUFFER_RESERVE_SIZE) { | |
129 | if(!msgpack_zbuffer_expand(zbuf)) { | |
130 | return -1; | |
131 | } | |
132 | } | |
133 | ||
134 | if(deflate(&zbuf->stream, Z_NO_FLUSH) != Z_OK) { | |
135 | return -1; | |
136 | } | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static inline char* msgpack_zbuffer_flush(msgpack_zbuffer* zbuf) | |
143 | { | |
144 | while(true) { | |
145 | switch(deflate(&zbuf->stream, Z_FINISH)) { | |
146 | case Z_STREAM_END: | |
147 | return zbuf->data; | |
148 | case Z_OK: | |
149 | case Z_BUF_ERROR: | |
150 | if(!msgpack_zbuffer_expand(zbuf)) { | |
151 | return NULL; | |
152 | } | |
153 | break; | |
154 | default: | |
155 | return NULL; | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
160 | static inline const char* msgpack_zbuffer_data(const msgpack_zbuffer* zbuf) | |
161 | { | |
162 | return zbuf->data; | |
163 | } | |
164 | ||
165 | static inline size_t msgpack_zbuffer_size(const msgpack_zbuffer* zbuf) | |
166 | { | |
167 | return (size_t)((char *)(zbuf->stream.next_out) - zbuf->data); | |
168 | } | |
169 | ||
170 | static inline void msgpack_zbuffer_reset_buffer(msgpack_zbuffer* zbuf) | |
171 | { | |
172 | zbuf->stream.avail_out += (uInt)((char*)zbuf->stream.next_out - zbuf->data); | |
173 | zbuf->stream.next_out = (Bytef*)zbuf->data; | |
174 | } | |
175 | ||
176 | static inline bool msgpack_zbuffer_reset(msgpack_zbuffer* zbuf) | |
177 | { | |
178 | if(deflateReset(&zbuf->stream) != Z_OK) { | |
179 | return false; | |
180 | } | |
181 | msgpack_zbuffer_reset_buffer(zbuf); | |
182 | return true; | |
183 | } | |
184 | ||
185 | static inline char* msgpack_zbuffer_release_buffer(msgpack_zbuffer* zbuf) | |
186 | { | |
187 | char* tmp = zbuf->data; | |
188 | zbuf->data = NULL; | |
189 | zbuf->stream.next_out = NULL; | |
190 | zbuf->stream.avail_out = 0; | |
191 | return tmp; | |
192 | } | |
193 | ||
194 | /** @} */ | |
195 | ||
196 | ||
197 | #ifdef __cplusplus | |
198 | } | |
199 | #endif | |
200 | ||
201 | #endif /* msgpack/zbuffer.h */ |