| 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 <assert.h> |
| 17 | #include <zlib.h> |
| 18 | |
| 19 | #ifdef __cplusplus |
| 20 | extern "C" { |
| 21 | #endif |
| 22 | |
| 23 | |
| 24 | /** |
| 25 | * @defgroup msgpack_zbuffer Compressed buffer |
| 26 | * @ingroup msgpack_buffer |
| 27 | * @{ |
| 28 | */ |
| 29 | |
| 30 | typedef struct msgpack_zbuffer { |
| 31 | z_stream stream; |
| 32 | char* data; |
| 33 | size_t init_size; |
| 34 | } msgpack_zbuffer; |
| 35 | |
| 36 | #ifndef MSGPACK_ZBUFFER_INIT_SIZE |
| 37 | #define MSGPACK_ZBUFFER_INIT_SIZE 8192 |
| 38 | #endif |
| 39 | |
| 40 | static inline bool msgpack_zbuffer_init( |
| 41 | msgpack_zbuffer* zbuf, int level, size_t init_size); |
| 42 | static inline void msgpack_zbuffer_destroy(msgpack_zbuffer* zbuf); |
| 43 | |
| 44 | static inline msgpack_zbuffer* msgpack_zbuffer_new(int level, size_t init_size); |
| 45 | static inline void msgpack_zbuffer_free(msgpack_zbuffer* zbuf); |
| 46 | |
| 47 | static inline char* msgpack_zbuffer_flush(msgpack_zbuffer* zbuf); |
| 48 | |
| 49 | static inline const char* msgpack_zbuffer_data(const msgpack_zbuffer* zbuf); |
| 50 | static inline size_t msgpack_zbuffer_size(const msgpack_zbuffer* zbuf); |
| 51 | |
| 52 | static inline bool msgpack_zbuffer_reset(msgpack_zbuffer* zbuf); |
| 53 | static inline void msgpack_zbuffer_reset_buffer(msgpack_zbuffer* zbuf); |
| 54 | static inline char* msgpack_zbuffer_release_buffer(msgpack_zbuffer* zbuf); |
| 55 | |
| 56 | |
| 57 | #ifndef MSGPACK_ZBUFFER_RESERVE_SIZE |
| 58 | #define MSGPACK_ZBUFFER_RESERVE_SIZE 512 |
| 59 | #endif |
| 60 | |
| 61 | static inline int msgpack_zbuffer_write(void* data, const char* buf, size_t len); |
| 62 | |
| 63 | static inline bool msgpack_zbuffer_expand(msgpack_zbuffer* zbuf); |
| 64 | |
| 65 | |
| 66 | static inline bool msgpack_zbuffer_init(msgpack_zbuffer* zbuf, |
| 67 | int level, size_t init_size) |
| 68 | { |
| 69 | memset(zbuf, 0, sizeof(msgpack_zbuffer)); |
| 70 | zbuf->init_size = init_size; |
| 71 | if(deflateInit(&zbuf->stream, level) != Z_OK) { |
| 72 | free(zbuf->data); |
| 73 | return false; |
| 74 | } |
| 75 | return true; |
| 76 | } |
| 77 | |
| 78 | static inline void msgpack_zbuffer_destroy(msgpack_zbuffer* zbuf) |
| 79 | { |
| 80 | deflateEnd(&zbuf->stream); |
| 81 | free(zbuf->data); |
| 82 | } |
| 83 | |
| 84 | static inline msgpack_zbuffer* msgpack_zbuffer_new(int level, size_t init_size) |
| 85 | { |
| 86 | msgpack_zbuffer* zbuf = (msgpack_zbuffer*)malloc(sizeof(msgpack_zbuffer)); |
| 87 | if (zbuf == NULL) return NULL; |
| 88 | if(!msgpack_zbuffer_init(zbuf, level, init_size)) { |
| 89 | free(zbuf); |
| 90 | return NULL; |
| 91 | } |
| 92 | return zbuf; |
| 93 | } |
| 94 | |
| 95 | static inline void msgpack_zbuffer_free(msgpack_zbuffer* zbuf) |
| 96 | { |
| 97 | if(zbuf == NULL) { return; } |
| 98 | msgpack_zbuffer_destroy(zbuf); |
| 99 | free(zbuf); |
| 100 | } |
| 101 | |
| 102 | static inline bool msgpack_zbuffer_expand(msgpack_zbuffer* zbuf) |
| 103 | { |
| 104 | size_t used = (size_t)((char *)(zbuf->stream.next_out) - zbuf->data); |
| 105 | size_t csize = used + zbuf->stream.avail_out; |
| 106 | |
| 107 | size_t nsize = (csize == 0) ? zbuf->init_size : csize * 2; |
| 108 | |
| 109 | char* tmp = (char*)realloc(zbuf->data, nsize); |
| 110 | if(tmp == NULL) { |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | zbuf->data = tmp; |
| 115 | zbuf->stream.next_out = (Bytef*)(tmp + used); |
| 116 | zbuf->stream.avail_out = (uInt)(nsize - used); |
| 117 | |
| 118 | return true; |
| 119 | } |
| 120 | |
| 121 | static inline int msgpack_zbuffer_write(void* data, const char* buf, size_t len) |
| 122 | { |
| 123 | msgpack_zbuffer* zbuf = (msgpack_zbuffer*)data; |
| 124 | |
| 125 | assert(buf || len == 0); |
| 126 | if(!buf) return 0; |
| 127 | |
| 128 | zbuf->stream.next_in = (Bytef*)buf; |
| 129 | zbuf->stream.avail_in = (uInt)len; |
| 130 | |
| 131 | while(zbuf->stream.avail_in > 0) { |
| 132 | if(zbuf->stream.avail_out < MSGPACK_ZBUFFER_RESERVE_SIZE) { |
| 133 | if(!msgpack_zbuffer_expand(zbuf)) { |
| 134 | return -1; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | if(deflate(&zbuf->stream, Z_NO_FLUSH) != Z_OK) { |
| 139 | return -1; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static inline char* msgpack_zbuffer_flush(msgpack_zbuffer* zbuf) |
| 147 | { |
| 148 | while(true) { |
| 149 | switch(deflate(&zbuf->stream, Z_FINISH)) { |
| 150 | case Z_STREAM_END: |
| 151 | return zbuf->data; |
| 152 | case Z_OK: |
| 153 | case Z_BUF_ERROR: |
| 154 | if(!msgpack_zbuffer_expand(zbuf)) { |
| 155 | return NULL; |
| 156 | } |
| 157 | break; |
| 158 | default: |
| 159 | return NULL; |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | static inline const char* msgpack_zbuffer_data(const msgpack_zbuffer* zbuf) |
| 165 | { |
| 166 | return zbuf->data; |
| 167 | } |
| 168 | |
| 169 | static inline size_t msgpack_zbuffer_size(const msgpack_zbuffer* zbuf) |
| 170 | { |
| 171 | return (size_t)((char *)(zbuf->stream.next_out) - zbuf->data); |
| 172 | } |
| 173 | |
| 174 | static inline void msgpack_zbuffer_reset_buffer(msgpack_zbuffer* zbuf) |
| 175 | { |
| 176 | zbuf->stream.avail_out += (uInt)((char*)zbuf->stream.next_out - zbuf->data); |
| 177 | zbuf->stream.next_out = (Bytef*)zbuf->data; |
| 178 | } |
| 179 | |
| 180 | static inline bool msgpack_zbuffer_reset(msgpack_zbuffer* zbuf) |
| 181 | { |
| 182 | if(deflateReset(&zbuf->stream) != Z_OK) { |
| 183 | return false; |
| 184 | } |
| 185 | msgpack_zbuffer_reset_buffer(zbuf); |
| 186 | return true; |
| 187 | } |
| 188 | |
| 189 | static inline char* msgpack_zbuffer_release_buffer(msgpack_zbuffer* zbuf) |
| 190 | { |
| 191 | char* tmp = zbuf->data; |
| 192 | zbuf->data = NULL; |
| 193 | zbuf->stream.next_out = NULL; |
| 194 | zbuf->stream.avail_out = 0; |
| 195 | return tmp; |
| 196 | } |
| 197 | |
| 198 | /** @} */ |
| 199 | |
| 200 | |
| 201 | #ifdef __cplusplus |
| 202 | } |
| 203 | #endif |
| 204 | |
| 205 | #endif /* msgpack/zbuffer.h */ |