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1 /* Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 /* Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 * Use of this source code is governed by a BSD-style license that can be | 2 * Use of this source code is governed by a BSD-style license that can be |
3 * found in the LICENSE file. | 3 * found in the LICENSE file. |
4 */ | 4 */ |
5 #ifndef PPAPI_C_PPB_VAR_H_ | 5 #ifndef PPAPI_C_PPB_VAR_H_ |
6 #define PPAPI_C_PPB_VAR_H_ | 6 #define PPAPI_C_PPB_VAR_H_ |
7 | 7 |
8 #include "ppapi/c/pp_bool.h" | 8 #include "ppapi/c/pp_bool.h" |
9 #include "ppapi/c/pp_instance.h" | 9 #include "ppapi/c/pp_instance.h" |
10 #include "ppapi/c/pp_macros.h" | 10 #include "ppapi/c/pp_macros.h" |
11 #include "ppapi/c/pp_module.h" | 11 #include "ppapi/c/pp_module.h" |
12 #include "ppapi/c/pp_resource.h" | 12 #include "ppapi/c/pp_resource.h" |
13 #include "ppapi/c/pp_stdint.h" | 13 #include "ppapi/c/pp_stdint.h" |
14 #include "ppapi/c/pp_var.h" | 14 #include "ppapi/c/pp_var.h" |
15 | 15 |
16 #define PPB_VAR_INTERFACE_0_5 "PPB_Var;0.5" | 16 #define PPB_VAR_INTERFACE_0_5 "PPB_Var;0.5" |
17 #define PPB_VAR_INTERFACE PPB_VAR_INTERFACE_0_5 | 17 #define PPB_VAR_INTERFACE PPB_VAR_INTERFACE_0_5 |
18 | 18 |
19 /** | 19 /** |
20 * @file | 20 * @file |
21 * This file defines the PPB_Var struct. | 21 * This file defines the <code>PPB_Var</code> struct. |
22 */ | 22 */ |
23 | 23 |
24 /** | 24 /** |
25 * @addtogroup Interfaces | 25 * @addtogroup Interfaces |
26 * @{ | 26 * @{ |
27 */ | 27 */ |
28 | 28 |
29 /** | 29 /** |
30 * PPB_Var API | 30 * PPB_Var API |
31 */ | 31 */ |
32 struct PPB_Var { | 32 struct PPB_Var { |
33 /** | 33 /** |
34 * Adds a reference to the given var. If this is not a refcounted object, | 34 * AddRef() adds a reference to the given var. If this is not a refcounted |
35 * this function will do nothing so you can always call it no matter what the | 35 * object, this function will do nothing so you can always call it no matter |
36 * type. | 36 * what the type. |
| 37 * |
| 38 * @param[in] var A <code>PP_Var</code> that will have a reference added. |
37 */ | 39 */ |
38 void (*AddRef)(struct PP_Var var); | 40 void (*AddRef)(struct PP_Var var); |
39 | 41 |
40 /** | 42 /** |
41 * Removes a reference to given var, deleting it if the internal refcount | 43 * Release() removes a reference to given var, deleting it if the internal |
42 * becomes 0. If the given var is not a refcounted object, this function will | 44 * reference count becomes 0. If the given var is not a refcounted object, |
43 * do nothing so you can always call it no matter what the type. | 45 * this function will do nothing so you can always call it no matter what |
| 46 * the type. |
| 47 * |
| 48 * @param[in] var A <code>PP_Var</code> that will have a reference removed. |
44 */ | 49 */ |
45 void (*Release)(struct PP_Var var); | 50 void (*Release)(struct PP_Var var); |
46 | 51 |
47 /** | 52 /** |
48 * Creates a string var from a string. The string must be encoded in valid | 53 * VarFromUtf8() creates a string var from a string. The string must be |
49 * UTF-8 and is NOT NULL-terminated, the length must be specified in |len|. | 54 * encoded in valid UTF-8 and is NOT NULL-terminated, the length must be |
50 * It is an error if the string is not valid UTF-8. | 55 * specified in <code>len</code>. It is an error if the string is not |
| 56 * valid UTF-8. |
51 * | 57 * |
52 * If the length is 0, the |data| pointer will not be dereferenced and may | 58 * If the length is 0, the <code>*data</code> pointer will not be dereferenced |
53 * be NULL. Note, however, that if you do this, the "NULL-ness" will not be | 59 * and may be <code>NULL</code>. Note, however if length is 0, the |
54 * preserved, as VarToUtf8 will never return NULL on success, even for empty | 60 * "NULL-ness" will not be preserved, as <code>VarToUtf8</code> will never |
55 * strings. | 61 * return <code>NULL</code> on success, even for empty strings. |
56 * | 62 * |
57 * The resulting object will be a refcounted string object. It will be | 63 * The resulting object will be a refcounted string object. It will be |
58 * AddRef()ed for the caller. When the caller is done with it, it should be | 64 * AddRef'ed for the caller. When the caller is done with it, it should be |
59 * Release()d. | 65 * Released. |
60 * | 66 * |
61 * On error (basically out of memory to allocate the string, or input that | 67 * On error (basically out of memory to allocate the string, or input that |
62 * is not valid UTF-8), this function will return a Null var. | 68 * is not valid UTF-8), this function will return a Null var. |
| 69 * |
| 70 * @param[in] module A PP_Module uniquely identifying the module or .nexe. |
| 71 * @param[in] data A string |
| 72 * @param[in] len The length of the string. |
| 73 * |
| 74 * @return A <code>PP_Var</code> structure containing a reference counted |
| 75 * string object. |
63 */ | 76 */ |
64 struct PP_Var (*VarFromUtf8)(PP_Module module, | 77 struct PP_Var (*VarFromUtf8)(PP_Module module, |
65 const char* data, uint32_t len); | 78 const char* data, uint32_t len); |
66 | 79 |
67 /** | 80 /** |
68 * Converts a string-type var to a char* encoded in UTF-8. This string is NOT | 81 * VarToUtf8() converts a string-type var to a char* encoded in UTF-8. This |
69 * NULL-terminated. The length will be placed in |*len|. If the string is | 82 * string is NOT NULL-terminated. The length will be placed in |
70 * valid but empty the return value will be non-NULL, but |*len| will still | 83 * <code>*len</code>. If the string is valid but empty the return value will |
71 * be 0. | 84 * be non-NULL, but <code>*len</code> will still be 0. |
72 * | 85 * |
73 * If the var is not a string, this function will return NULL and |*len| will | 86 * If the var is not a string, this function will return NULL and |
74 * be 0. | 87 * <code>*len</code> will be 0. |
75 * | 88 * |
76 * The returned buffer will be valid as long as the underlying var is alive. | 89 * The returned buffer will be valid as long as the underlying var is alive. |
77 * If the plugin frees its reference, the string will be freed and the pointer | 90 * If the instance frees its reference, the string will be freed and the |
78 * will be to random memory. | 91 * pointer will be to arbitrary memory. |
| 92 * |
| 93 * @param[in] var A PP_Var struct containing a string-type var. |
| 94 * @param[in,out] len A pointer to the length of the string-type var. |
| 95 * |
| 96 * @return A char* encoded in UTF-8. |
79 */ | 97 */ |
80 const char* (*VarToUtf8)(struct PP_Var var, uint32_t* len); | 98 const char* (*VarToUtf8)(struct PP_Var var, uint32_t* len); |
81 }; | 99 }; |
82 /** | 100 /** |
83 * @} | 101 * @} |
84 */ | 102 */ |
85 | 103 |
86 #endif /* PPAPI_C_PPB_VAR_H_ */ | 104 #endif /* PPAPI_C_PPB_VAR_H_ */ |
87 | 105 |
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