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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 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 <sigrok.h> | |
25 | ||
26 | static gpointer new_chunk(struct datastore **ds); | |
27 | ||
28 | int datastore_new(int unitsize, struct datastore **ds) | |
29 | { | |
30 | if (!ds) | |
31 | return SR_ERR; | |
32 | ||
33 | if (unitsize <= 0) | |
34 | return SR_ERR; /* TODO: Different error? */ | |
35 | ||
36 | if (!(*ds = g_malloc(sizeof(struct datastore)))) | |
37 | return SR_ERR_MALLOC; | |
38 | ||
39 | (*ds)->ds_unitsize = unitsize; | |
40 | (*ds)->num_units = 0; | |
41 | (*ds)->chunklist = NULL; | |
42 | ||
43 | return SR_OK; | |
44 | } | |
45 | ||
46 | int datastore_destroy(struct datastore *ds) | |
47 | { | |
48 | GSList *chunk; | |
49 | ||
50 | if (!ds) | |
51 | return SR_ERR; | |
52 | ||
53 | for (chunk = ds->chunklist; chunk; chunk = chunk->next) | |
54 | g_free(chunk->data); | |
55 | g_slist_free(ds->chunklist); | |
56 | g_free(ds); | |
57 | ||
58 | return SR_OK; | |
59 | } | |
60 | ||
61 | void datastore_put(struct datastore *ds, void *data, unsigned int length, | |
62 | int in_unitsize, int *probelist) | |
63 | { | |
64 | unsigned int stored; | |
65 | int capacity, size, num_chunks, chunk_bytes_free, chunk_offset; | |
66 | gpointer chunk; | |
67 | ||
68 | /* Avoid compiler warnings. */ | |
69 | in_unitsize = in_unitsize; | |
70 | probelist = probelist; | |
71 | ||
72 | if (ds->chunklist == NULL) | |
73 | chunk = new_chunk(&ds); | |
74 | else | |
75 | chunk = g_slist_last(ds->chunklist)->data; | |
76 | ||
77 | num_chunks = g_slist_length(ds->chunklist); | |
78 | capacity = (num_chunks * DATASTORE_CHUNKSIZE); | |
79 | chunk_bytes_free = capacity - (ds->ds_unitsize * ds->num_units); | |
80 | chunk_offset = capacity - (DATASTORE_CHUNKSIZE * (num_chunks - 1)) | |
81 | - chunk_bytes_free; | |
82 | stored = 0; | |
83 | while (stored < length) { | |
84 | if (chunk_bytes_free == 0) { | |
85 | chunk = new_chunk(&ds); | |
86 | chunk_bytes_free = DATASTORE_CHUNKSIZE; | |
87 | chunk_offset = 0; | |
88 | } | |
89 | ||
90 | if (length - stored > (unsigned int)chunk_bytes_free) | |
91 | size = chunk_bytes_free; | |
92 | else | |
93 | /* Last part, won't fill up this chunk. */ | |
94 | size = length - stored; | |
95 | ||
96 | memcpy(chunk + chunk_offset, data + stored, size); | |
97 | chunk_bytes_free -= size; | |
98 | stored += size; | |
99 | } | |
100 | ds->num_units += stored / ds->ds_unitsize; | |
101 | } | |
102 | ||
103 | static gpointer new_chunk(struct datastore **ds) | |
104 | { | |
105 | gpointer chunk; | |
106 | ||
107 | if (!(chunk = malloc(DATASTORE_CHUNKSIZE * (*ds)->ds_unitsize))) | |
108 | return NULL; | |
109 | ||
110 | (*ds)->chunklist = g_slist_append((*ds)->chunklist, chunk); | |
111 | ||
112 | return chunk; | |
113 | } |