OLD | NEW |
1 /* | 1 /* |
2 * jmemsys.h | 2 * jmemsys.h |
3 * | 3 * |
4 * Copyright (C) 1992-1997, Thomas G. Lane. | 4 * Copyright (C) 1992-1997, Thomas G. Lane. |
5 * This file is part of the Independent JPEG Group's software. | 5 * This file is part of the Independent JPEG Group's software. |
6 * For conditions of distribution and use, see the accompanying README file. | 6 * For conditions of distribution and use, see the accompanying README file. |
7 * | 7 * |
8 * This include file defines the interface between the system-independent | 8 * This include file defines the interface between the system-independent |
9 * and system-dependent portions of the JPEG memory manager. No other | 9 * and system-dependent portions of the JPEG memory manager. No other |
10 * modules need include it. (The system-independent portion is jmemmgr.c; | 10 * modules need include it. (The system-independent portion is jmemmgr.c; |
11 * there are several different versions of the system-dependent portion.) | 11 * there are several different versions of the system-dependent portion.) |
12 * | 12 * |
13 * This file works as-is for the system-dependent memory managers supplied | 13 * This file works as-is for the system-dependent memory managers supplied |
14 * in the IJG distribution. You may need to modify it if you write a | 14 * in the IJG distribution. You may need to modify it if you write a |
15 * custom memory manager. If system-dependent changes are needed in | 15 * custom memory manager. |
16 * this file, the best method is to #ifdef them based on a configuration | |
17 * symbol supplied in jconfig.h, as we have done with USE_MSDOS_MEMMGR | |
18 * and USE_MAC_MEMMGR. | |
19 */ | 16 */ |
20 | 17 |
21 | 18 |
22 /* Short forms of external names for systems with brain-damaged linkers. */ | 19 /* Short forms of external names for systems with brain-damaged linkers. */ |
23 | 20 |
24 #ifdef NEED_SHORT_EXTERNAL_NAMES | 21 #ifdef NEED_SHORT_EXTERNAL_NAMES |
25 #define jpeg_get_small jGetSmall | 22 #define jpeg_get_small jGetSmall |
26 #define jpeg_free_small jFreeSmall | 23 #define jpeg_free_small jFreeSmall |
27 #define jpeg_get_large jGetLarge | 24 #define jpeg_get_large jGetLarge |
28 #define jpeg_free_large jFreeLarge | 25 #define jpeg_free_large jFreeLarge |
(...skipping 79 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
108 | 105 |
109 /* | 106 /* |
110 * This structure holds whatever state is needed to access a single | 107 * This structure holds whatever state is needed to access a single |
111 * backing-store object. The read/write/close method pointers are called | 108 * backing-store object. The read/write/close method pointers are called |
112 * by jmemmgr.c to manipulate the backing-store object; all other fields | 109 * by jmemmgr.c to manipulate the backing-store object; all other fields |
113 * are private to the system-dependent backing store routines. | 110 * are private to the system-dependent backing store routines. |
114 */ | 111 */ |
115 | 112 |
116 #define TEMP_NAME_LENGTH 64 /* max length of a temporary file's name */ | 113 #define TEMP_NAME_LENGTH 64 /* max length of a temporary file's name */ |
117 | 114 |
118 | |
119 #ifdef USE_MSDOS_MEMMGR /* DOS-specific junk */ | |
120 | |
121 typedef unsigned short XMSH; /* type of extended-memory handles */ | |
122 typedef unsigned short EMSH; /* type of expanded-memory handles */ | |
123 | |
124 typedef union { | |
125 short file_handle; /* DOS file handle if it's a temp file */ | |
126 XMSH xms_handle; /* handle if it's a chunk of XMS */ | |
127 EMSH ems_handle; /* handle if it's a chunk of EMS */ | |
128 } handle_union; | |
129 | |
130 #endif /* USE_MSDOS_MEMMGR */ | |
131 | |
132 #ifdef USE_MAC_MEMMGR /* Mac-specific junk */ | |
133 #include <Files.h> | |
134 #endif /* USE_MAC_MEMMGR */ | |
135 | |
136 | |
137 typedef struct backing_store_struct * backing_store_ptr; | 115 typedef struct backing_store_struct * backing_store_ptr; |
138 | 116 |
139 typedef struct backing_store_struct { | 117 typedef struct backing_store_struct { |
140 /* Methods for reading/writing/closing this backing-store object */ | 118 /* Methods for reading/writing/closing this backing-store object */ |
141 JMETHOD(void, read_backing_store, (j_common_ptr cinfo, | 119 JMETHOD(void, read_backing_store, (j_common_ptr cinfo, |
142 backing_store_ptr info, | 120 backing_store_ptr info, |
143 void FAR * buffer_address, | 121 void FAR * buffer_address, |
144 long file_offset, long byte_count)); | 122 long file_offset, long byte_count)); |
145 JMETHOD(void, write_backing_store, (j_common_ptr cinfo, | 123 JMETHOD(void, write_backing_store, (j_common_ptr cinfo, |
146 backing_store_ptr info, | 124 backing_store_ptr info, |
147 void FAR * buffer_address, | 125 void FAR * buffer_address, |
148 long file_offset, long byte_count)); | 126 long file_offset, long byte_count)); |
149 JMETHOD(void, close_backing_store, (j_common_ptr cinfo, | 127 JMETHOD(void, close_backing_store, (j_common_ptr cinfo, |
150 backing_store_ptr info)); | 128 backing_store_ptr info)); |
151 | 129 |
152 /* Private fields for system-dependent backing-store management */ | 130 /* Private fields for system-dependent backing-store management */ |
153 #ifdef USE_MSDOS_MEMMGR | |
154 /* For the MS-DOS manager (jmemdos.c), we need: */ | |
155 handle_union handle; /* reference to backing-store storage object */ | |
156 char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */ | |
157 #else | |
158 #ifdef USE_MAC_MEMMGR | |
159 /* For the Mac manager (jmemmac.c), we need: */ | |
160 short temp_file; /* file reference number to temp file */ | |
161 FSSpec tempSpec; /* the FSSpec for the temp file */ | |
162 char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */ | |
163 #else | |
164 /* For a typical implementation with temp files, we need: */ | 131 /* For a typical implementation with temp files, we need: */ |
165 #ifndef _FPDFAPI_MINI_ | |
166 FXSYS_FILE * temp_file; /* stdio reference to temp file */ | 132 FXSYS_FILE * temp_file; /* stdio reference to temp file */ |
167 char temp_name[TEMP_NAME_LENGTH]; /* name of temp file */ | 133 char temp_name[TEMP_NAME_LENGTH]; /* name of temp file */ |
168 #endif | |
169 #endif | |
170 #endif | |
171 } backing_store_info; | 134 } backing_store_info; |
172 | 135 |
173 | 136 |
174 /* | 137 /* |
175 * Initial opening of a backing-store object. This must fill in the | 138 * Initial opening of a backing-store object. This must fill in the |
176 * read/write/close pointers in the object. The read/write routines | 139 * read/write/close pointers in the object. The read/write routines |
177 * may take an error exit if the specified maximum file size is exceeded. | 140 * may take an error exit if the specified maximum file size is exceeded. |
178 * (If jpeg_mem_available always returns a large value, this routine can | 141 * (If jpeg_mem_available always returns a large value, this routine can |
179 * just take an error exit.) | 142 * just take an error exit.) |
180 */ | 143 */ |
(...skipping 10 matching lines...) Expand all Loading... |
191 * manager pointer). It should return a suitable default value for | 154 * manager pointer). It should return a suitable default value for |
192 * max_memory_to_use; this may subsequently be overridden by the surrounding | 155 * max_memory_to_use; this may subsequently be overridden by the surrounding |
193 * application. (Note that max_memory_to_use is only important if | 156 * application. (Note that max_memory_to_use is only important if |
194 * jpeg_mem_available chooses to consult it ... no one else will.) | 157 * jpeg_mem_available chooses to consult it ... no one else will.) |
195 * jpeg_mem_term may assume that all requested memory has been freed and that | 158 * jpeg_mem_term may assume that all requested memory has been freed and that |
196 * all opened backing-store objects have been closed. | 159 * all opened backing-store objects have been closed. |
197 */ | 160 */ |
198 | 161 |
199 EXTERN(long) jpeg_mem_init JPP((j_common_ptr cinfo)); | 162 EXTERN(long) jpeg_mem_init JPP((j_common_ptr cinfo)); |
200 EXTERN(void) jpeg_mem_term JPP((j_common_ptr cinfo)); | 163 EXTERN(void) jpeg_mem_term JPP((j_common_ptr cinfo)); |
OLD | NEW |