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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <stdlib.h> | |
21 | #include <stdint.h> | |
22 | #include <string.h> | |
23 | #include <glib.h> | |
24 | #include "libsigrok.h" | |
25 | #include "libsigrok-internal.h" | |
26 | ||
27 | /* Message logging helpers with driver-specific prefix string. */ | |
28 | #define DRIVER_LOG_DOMAIN "datastore: " | |
29 | #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args) | |
30 | #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args) | |
31 | #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args) | |
32 | #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args) | |
33 | #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args) | |
34 | #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args) | |
35 | ||
36 | /** | |
37 | * @file | |
38 | * | |
39 | * Creating, using, or destroying libsigrok datastores. | |
40 | */ | |
41 | ||
42 | /** | |
43 | * @defgroup grp_datastore Datastore | |
44 | * | |
45 | * Creating, using, or destroying libsigrok datastores. | |
46 | * | |
47 | * @{ | |
48 | */ | |
49 | ||
50 | static gpointer new_chunk(struct sr_datastore **ds); | |
51 | ||
52 | /** | |
53 | * Create a new datastore with the specified unit size. | |
54 | * | |
55 | * The unit size is fixed once the datastore is created, and cannot be | |
56 | * changed later on, neither can data be added to the datastore with | |
57 | * different unit sizes later. | |
58 | * | |
59 | * It is the caller's responsibility to free the allocated memory of the | |
60 | * datastore via the sr_datastore_destroy() function, if no longer needed. | |
61 | * | |
62 | * @todo Unitsize should probably be unsigned int or uint32_t or similar. | |
63 | * @todo This function should have a 'chunksize' parameter, and | |
64 | * struct sr_datastore a 'chunksize' field. | |
65 | * | |
66 | * @param unitsize The unit size (>= 1) to be used for this datastore. | |
67 | * @param ds Pointer to a variable which will hold the newly created | |
68 | * datastore structure. | |
69 | * | |
70 | * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors, | |
71 | * or SR_ERR_ARG upon invalid arguments. If something other than SR_OK | |
72 | * is returned, the value of 'ds' is undefined. | |
73 | */ | |
74 | SR_API int sr_datastore_new(int unitsize, struct sr_datastore **ds) | |
75 | { | |
76 | if (!ds) { | |
77 | sr_err("%s: ds was NULL", __func__); | |
78 | return SR_ERR_ARG; | |
79 | } | |
80 | ||
81 | if (unitsize <= 0) { | |
82 | sr_err("%s: unitsize was %d, but it must be >= 1", | |
83 | __func__, unitsize); | |
84 | return SR_ERR_ARG; | |
85 | } | |
86 | ||
87 | if (!(*ds = g_try_malloc(sizeof(struct sr_datastore)))) { | |
88 | sr_err("%s: ds malloc failed", __func__); | |
89 | return SR_ERR_MALLOC; | |
90 | } | |
91 | ||
92 | (*ds)->ds_unitsize = unitsize; | |
93 | (*ds)->num_units = 0; | |
94 | (*ds)->chunklist = NULL; | |
95 | ||
96 | return SR_OK; | |
97 | } | |
98 | ||
99 | /** | |
100 | * Destroy the specified datastore and free the memory used by it. | |
101 | * | |
102 | * This will free the memory used by the data in the datastore's 'chunklist', | |
103 | * by the chunklist data structure itself, and by the datastore struct. | |
104 | * | |
105 | * @param ds The datastore to destroy. | |
106 | * | |
107 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. | |
108 | */ | |
109 | SR_API int sr_datastore_destroy(struct sr_datastore *ds) | |
110 | { | |
111 | GSList *chunk; | |
112 | ||
113 | if (!ds) { | |
114 | sr_err("%s: ds was NULL", __func__); | |
115 | return SR_ERR_ARG; | |
116 | } | |
117 | ||
118 | for (chunk = ds->chunklist; chunk; chunk = chunk->next) | |
119 | g_free(chunk->data); | |
120 | g_slist_free(ds->chunklist); | |
121 | g_free(ds); | |
122 | ds = NULL; | |
123 | ||
124 | return SR_OK; | |
125 | } | |
126 | ||
127 | /** | |
128 | * Append some data to the specified datastore. | |
129 | * | |
130 | * @todo More elaborate function description. | |
131 | * @todo This function should use the (not yet available) 'chunksize' field | |
132 | * of struct sr_datastore (instead of hardcoding DATASTORE_CHUNKSIZE). | |
133 | * @todo in_unitsize and probelist are unused? | |
134 | * @todo A few of the parameters can be const. | |
135 | * @todo Ideally, 'ds' should be unmodified upon errors. | |
136 | * @todo Should 0 be allowed as length? | |
137 | * @todo Specify/document the data format of the 'data' parameter. | |
138 | * | |
139 | * @param ds Pointer to the datastore which shall receive the data. | |
140 | * Must not be NULL. | |
141 | * @param data Pointer to the memory buffer containing the data to add. | |
142 | * Must not be NULL. | |
143 | * @param length Length of the data to add (in number of bytes). | |
144 | * @param in_unitsize The unit size (>= 1) of the input data. | |
145 | * @param probelist Pointer to a list of integers (probe numbers). The probe | |
146 | * numbers in this list are 1-based, i.e. the first probe | |
147 | * is expected to be numbered 1 (not 0!). Must not be NULL. | |
148 | * | |
149 | * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors, | |
150 | * or SR_ERR_ARG upon invalid arguments. If something other than SR_OK | |
151 | * is returned, the value/state of 'ds' is undefined. | |
152 | */ | |
153 | SR_API int sr_datastore_put(struct sr_datastore *ds, void *data, | |
154 | unsigned int length, int in_unitsize, const int *probelist) | |
155 | { | |
156 | unsigned int stored; | |
157 | int capacity, size, num_chunks, chunk_bytes_free, chunk_offset; | |
158 | gpointer chunk; | |
159 | ||
160 | if (!ds) { | |
161 | sr_err("%s: ds was NULL", __func__); | |
162 | return SR_ERR_ARG; | |
163 | } | |
164 | ||
165 | /* Unitsize must not be 0, we'll divide by 0 otherwise. */ | |
166 | if (ds->ds_unitsize == 0) { | |
167 | sr_err("%s: ds->ds_unitsize was 0", __func__); | |
168 | return SR_ERR_ARG; | |
169 | } | |
170 | ||
171 | if (!data) { | |
172 | sr_err("%s: data was NULL", __func__); | |
173 | return SR_ERR_ARG; | |
174 | } | |
175 | ||
176 | if (in_unitsize < 1) { | |
177 | sr_err("%s: in_unitsize was %d, but it must be >= 1", | |
178 | __func__, in_unitsize); | |
179 | return SR_ERR_ARG; | |
180 | } | |
181 | ||
182 | if (!probelist) { | |
183 | sr_err("%s: probelist was NULL", __func__); | |
184 | return SR_ERR_ARG; | |
185 | } | |
186 | ||
187 | /* Get the last chunk in the list, or create a new one if needed. */ | |
188 | if (ds->chunklist == NULL) { | |
189 | if (!(chunk = new_chunk(&ds))) { | |
190 | sr_err("%s: couldn't allocate new chunk", __func__); | |
191 | return SR_ERR_MALLOC; | |
192 | } | |
193 | } else { | |
194 | chunk = g_slist_last(ds->chunklist)->data; | |
195 | } | |
196 | ||
197 | /* Get/calculate number of chunks, free space, etc. */ | |
198 | num_chunks = g_slist_length(ds->chunklist); | |
199 | capacity = (num_chunks * DATASTORE_CHUNKSIZE); | |
200 | chunk_bytes_free = capacity - (ds->ds_unitsize * ds->num_units); | |
201 | chunk_offset = capacity - (DATASTORE_CHUNKSIZE * (num_chunks - 1)) | |
202 | - chunk_bytes_free; | |
203 | ||
204 | stored = 0; | |
205 | while (stored < length) { | |
206 | /* No more free space left, allocate a new chunk. */ | |
207 | if (chunk_bytes_free == 0) { | |
208 | if (!(chunk = new_chunk(&ds))) { | |
209 | sr_err("%s: couldn't allocate new chunk", | |
210 | __func__); | |
211 | return SR_ERR_MALLOC; | |
212 | } | |
213 | chunk_bytes_free = DATASTORE_CHUNKSIZE; | |
214 | chunk_offset = 0; | |
215 | } | |
216 | ||
217 | if (length - stored > (unsigned int)chunk_bytes_free) | |
218 | size = chunk_bytes_free; | |
219 | else | |
220 | /* Last part, won't fill up this chunk. */ | |
221 | size = length - stored; | |
222 | ||
223 | memcpy(chunk + chunk_offset, data + stored, size); | |
224 | chunk_bytes_free -= size; | |
225 | stored += size; | |
226 | } | |
227 | ||
228 | ds->num_units += stored / ds->ds_unitsize; | |
229 | ||
230 | return SR_OK; | |
231 | } | |
232 | ||
233 | /** | |
234 | * Allocate a new memory chunk, append it to the datastore's chunklist. | |
235 | * | |
236 | * The newly allocated chunk is added to the datastore's chunklist by this | |
237 | * function, and the return value additionally points to the new chunk. | |
238 | * | |
239 | * The allocated memory is guaranteed to be cleared. | |
240 | * | |
241 | * @todo This function should use the datastore's 'chunksize' field instead | |
242 | * of hardcoding DATASTORE_CHUNKSIZE. | |
243 | * @todo Return int, so we can return SR_OK / SR_ERR_ARG / SR_ERR_MALLOC? | |
244 | * | |
245 | * @param ds Pointer to a variable which holds the datastore structure. | |
246 | * Must not be NULL. The contents of 'ds' are modified in-place. | |
247 | * | |
248 | * @return Pointer to the newly allocated chunk, or NULL upon failure. | |
249 | */ | |
250 | static gpointer new_chunk(struct sr_datastore **ds) | |
251 | { | |
252 | gpointer chunk; | |
253 | ||
254 | /* Note: Caller checked that ds != NULL. */ | |
255 | ||
256 | chunk = g_try_malloc0(DATASTORE_CHUNKSIZE * (*ds)->ds_unitsize); | |
257 | if (!chunk) { | |
258 | sr_err("%s: chunk malloc failed (ds_unitsize was %u)", | |
259 | __func__, (*ds)->ds_unitsize); | |
260 | return NULL; /* TODO: SR_ERR_MALLOC later? */ | |
261 | } | |
262 | ||
263 | (*ds)->chunklist = g_slist_append((*ds)->chunklist, chunk); | |
264 | ||
265 | return chunk; /* TODO: SR_OK later? */ | |
266 | } | |
267 | ||
268 | /** @} */ |