| 1 | /* |
| 2 | * MessagePack for C simple buffer implementation |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 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_SBUFFER_H |
| 11 | #define MSGPACK_SBUFFER_H |
| 12 | |
| 13 | #include <stdlib.h> |
| 14 | #include <string.h> |
| 15 | #include <assert.h> |
| 16 | |
| 17 | #ifdef __cplusplus |
| 18 | extern "C" { |
| 19 | #endif |
| 20 | |
| 21 | |
| 22 | /** |
| 23 | * @defgroup msgpack_sbuffer Simple buffer |
| 24 | * @ingroup msgpack_buffer |
| 25 | * @{ |
| 26 | */ |
| 27 | |
| 28 | typedef struct msgpack_sbuffer { |
| 29 | size_t size; |
| 30 | char* data; |
| 31 | size_t alloc; |
| 32 | } msgpack_sbuffer; |
| 33 | |
| 34 | static inline void msgpack_sbuffer_init(msgpack_sbuffer* sbuf) |
| 35 | { |
| 36 | memset(sbuf, 0, sizeof(msgpack_sbuffer)); |
| 37 | } |
| 38 | |
| 39 | static inline void msgpack_sbuffer_destroy(msgpack_sbuffer* sbuf) |
| 40 | { |
| 41 | free(sbuf->data); |
| 42 | } |
| 43 | |
| 44 | static inline msgpack_sbuffer* msgpack_sbuffer_new(void) |
| 45 | { |
| 46 | return (msgpack_sbuffer*)calloc(1, sizeof(msgpack_sbuffer)); |
| 47 | } |
| 48 | |
| 49 | static inline void msgpack_sbuffer_free(msgpack_sbuffer* sbuf) |
| 50 | { |
| 51 | if(sbuf == NULL) { return; } |
| 52 | msgpack_sbuffer_destroy(sbuf); |
| 53 | free(sbuf); |
| 54 | } |
| 55 | |
| 56 | #ifndef MSGPACK_SBUFFER_INIT_SIZE |
| 57 | #define MSGPACK_SBUFFER_INIT_SIZE 8192 |
| 58 | #endif |
| 59 | |
| 60 | static inline int msgpack_sbuffer_write(void* data, const char* buf, size_t len) |
| 61 | { |
| 62 | msgpack_sbuffer* sbuf = (msgpack_sbuffer*)data; |
| 63 | |
| 64 | assert(buf || len == 0); |
| 65 | if(!buf) return 0; |
| 66 | |
| 67 | if(sbuf->alloc - sbuf->size < len) { |
| 68 | void* tmp; |
| 69 | size_t nsize = (sbuf->alloc) ? |
| 70 | sbuf->alloc * 2 : MSGPACK_SBUFFER_INIT_SIZE; |
| 71 | |
| 72 | while(nsize < sbuf->size + len) { |
| 73 | size_t tmp_nsize = nsize * 2; |
| 74 | if (tmp_nsize <= nsize) { |
| 75 | nsize = sbuf->size + len; |
| 76 | break; |
| 77 | } |
| 78 | nsize = tmp_nsize; |
| 79 | } |
| 80 | |
| 81 | tmp = realloc(sbuf->data, nsize); |
| 82 | if(!tmp) { return -1; } |
| 83 | |
| 84 | sbuf->data = (char*)tmp; |
| 85 | sbuf->alloc = nsize; |
| 86 | } |
| 87 | |
| 88 | memcpy(sbuf->data + sbuf->size, buf, len); |
| 89 | sbuf->size += len; |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static inline char* msgpack_sbuffer_release(msgpack_sbuffer* sbuf) |
| 95 | { |
| 96 | char* tmp = sbuf->data; |
| 97 | sbuf->size = 0; |
| 98 | sbuf->data = NULL; |
| 99 | sbuf->alloc = 0; |
| 100 | return tmp; |
| 101 | } |
| 102 | |
| 103 | static inline void msgpack_sbuffer_clear(msgpack_sbuffer* sbuf) |
| 104 | { |
| 105 | sbuf->size = 0; |
| 106 | } |
| 107 | |
| 108 | /** @} */ |
| 109 | |
| 110 | |
| 111 | #ifdef __cplusplus |
| 112 | } |
| 113 | #endif |
| 114 | |
| 115 | #endif /* msgpack/sbuffer.h */ |