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93 ////////////////////////////////////////////////////////////////////////////////
94
95 ///////////////////////////////////////////////////////////////////////////////////////////////////
96 ///
97 /// file jpeg_memory.c
98 /// @brief JPEG memory management
99 /// @author MStar Semiconductor Inc.
100 ///////////////////////////////////////////////////////////////////////////////////////////////////
101
102 //-------------------------------------------------------------------------------------------------
103 // Include Files
104 //-------------------------------------------------------------------------------------------------
105 #ifndef CMODEL
106 #include "MsCommon.h"
107 #include "njpeg_def.h"
108 //#include "Utl.h"
109 #else
110 #include <string.h>
111 #include "jpeg_cmodel_def.h"
112 #endif
113 #include "jpeg_memory.h"
114
115 //-------------------------------------------------------------------------------------------------
116 // Local Compiler Options
117 //-------------------------------------------------------------------------------------------------
118
119
120 //-------------------------------------------------------------------------------------------------
121 // Local Defines
122 //-------------------------------------------------------------------------------------------------
123 #define HLEN (sizeof(__memt__))
124 #define MIN_BLOCK (HLEN * 4)
125
126 #define AVAIL (__mem_avail__[0])
127
128 #define MIN_POOL_SIZE (HLEN * 10)
129
130
131 //-------------------------------------------------------------------------------------------------
132 // Local Structures
133 //-------------------------------------------------------------------------------------------------
134 //-----------------------------------------------------------------------------
135 /// @brief \b Struct \b Name: __memt__
136 /// @brief \b Struct \b Description: mpool structure for jpd
137 //-----------------------------------------------------------------------------
138 typedef struct __mem__
139 {
140 struct __mem__ *next; ///< single-linked list
141 MS_U32 len; ///< length of following block
142 } __memt__, *__memp__;
143
144
145 //-------------------------------------------------------------------------------------------------
146 // Global Variables
147 //-------------------------------------------------------------------------------------------------
148
149
150 //-------------------------------------------------------------------------------------------------
151 // Local Variables
152 //-------------------------------------------------------------------------------------------------
153 __memt__ __mem_avail__ [2] =
154 {
155 { NULL, 0 }, /* HEAD for the available block list */
156 { NULL, 0 }, /* UNUSED but necessary so free doesn't join HEAD or ROVER with the pool */
157 };
158
159
160 //-------------------------------------------------------------------------------------------------
161 // Debug Functions
162 //-------------------------------------------------------------------------------------------------
163
164
165 //-------------------------------------------------------------------------------------------------
166 // Local Functions
167 //-------------------------------------------------------------------------------------------------
168
169
170 //-------------------------------------------------------------------------------------------------
171 // Global Functions
172 //-------------------------------------------------------------------------------------------------
JPEG_MEMORY_init_mempool(void * pool,MS_U32 size)173 MS_BOOL JPEG_MEMORY_init_mempool (void *pool, MS_U32 size)
174 {
175 if (size < MIN_POOL_SIZE)
176 return FALSE; /* FAILURE */
177
178 __mem_avail__[0].next = NULL;
179 __mem_avail__[0].len = 0;
180 __mem_avail__[1].next = NULL;
181 __mem_avail__[1].len = 0;
182
183 if (pool == NULL)
184 {
185 pool = (void *)1;
186 size--;
187 }
188
189 /* Don't memset JPEG memory pool, it is cobuffer with display buffer. */
190 // JPEG_memset(pool, 0, size);
191
192 AVAIL.next = (struct __mem__ *)pool;
193 AVAIL.len = size;
194
195 (AVAIL.next)->next = NULL;
196 (AVAIL.next)->len = size - HLEN;
197
198 return TRUE; /* SUCCESS */
199 }
200
JPEG_MEMORY_malloc(MS_U32 size)201 void *JPEG_MEMORY_malloc (MS_U32 size)
202 {
203 __memp__ q; /* ptr to free block */
204 __memp__ p; /* q->next */
205 MS_U32 k; /* space remaining in the allocated block */
206 q = &AVAIL;
207
208 while (1)
209 {
210 p = q->next;
211 if (p == NULL)
212 {
213 return (NULL); /* FAILURE */
214 }
215
216 if (p->len >= size)
217 break;
218
219 q = p;
220 }
221
222 k = p->len - size; /* calc. remaining bytes in block */
223
224 if (k < MIN_BLOCK) /* rem. bytes too small for new block */
225 {
226 q->next = p->next;
227 return (&p[1]); /* SUCCESS */
228 }
229
230 k -= HLEN;
231 p->len = k;
232
233 q = (__memp__ ) ((MS_VIRT)((MS_U8 *) (&p [1])) + k);
234 q->len = size;
235 q->next = NULL;
236
237 return (&q[1]); /* SUCCESS */
238 }
239
JPEG_MEMORY_free(void * memp)240 void JPEG_MEMORY_free (void *memp)
241 {
242 __memp__ q; /* ptr to free block */
243 __memp__ p; /* q->next */
244 __memp__ p0; /* block to free */
245
246 if ((memp == NULL) || (AVAIL.len == 0))
247 return;
248
249 p0 = (__memp__) memp;
250 p0 = &p0 [-1]; /* get address of header */
251
252 q = &AVAIL;
253
254 while (1)
255 {
256 p = q->next;
257
258 if ((p == NULL) || (p > (__memp__) memp))
259 break;
260
261 q = p;
262 }
263
264 if ((p != NULL) && ((((MS_U8 *)memp) + p0->len) == (MS_U8 *)p))
265 {
266 p0->len += p->len + HLEN;
267 p0->next = p->next;
268 }
269 else
270 {
271 p0->next = p;
272 }
273
274 if ((((MS_U8 *)q) + q->len + HLEN) == (MS_U8 *)p0)
275 {
276 q->len += p0->len + HLEN;
277 q->next = p0->next;
278 }
279 else
280 {
281 q->next = p0;
282 }
283 }
284
285