projects/linux·blob v6.6 · refs

256 lines · 4.5 KiB

1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (C) Copyright David Gibson <[email protected]>, IBM Corporation. 2005.
4 */
5
6#include "dtc.h"
7
8void data_free(struct data d)
9{
10 struct marker *m, *nm;
11
12 m = d.markers;
13 while (m) {
14 nm = m->next;
15 free(m->ref);
16 free(m);
17 m = nm;
18 }
19
20 if (d.val)
21 free(d.val);
22}
23
24struct data data_grow_for(struct data d, unsigned int xlen)
25{
26 struct data nd;
27 unsigned int newsize;
28
29 if (xlen == 0)
30 return d;
31
32 nd = d;
33
34 newsize = xlen;
35
36 while ((d.len + xlen) > newsize)
37 newsize *= 2;
38
39 nd.val = xrealloc(d.val, newsize);
40
41 return nd;
42}
43
44struct data data_copy_mem(const char *mem, int len)
45{
46 struct data d;
47
48 d = data_grow_for(empty_data, len);
49
50 d.len = len;
51 memcpy(d.val, mem, len);
52
53 return d;
54}
55
56struct data data_copy_escape_string(const char *s, int len)
57{
58 int i = 0;
59 struct data d;
60 char *q;
61
62 d = data_add_marker(empty_data, TYPE_STRING, NULL);
63 d = data_grow_for(d, len + 1);
64
65 q = d.val;
66 while (i < len) {
67 char c = s[i++];
68
69 if (c == '\\')
70 c = get_escape_char(s, &i);
71
72 q[d.len++] = c;
73 }
74
75 q[d.len++] = '\0';
76 return d;
77}
78
79struct data data_copy_file(FILE *f, size_t maxlen)
80{
81 struct data d = empty_data;
82
83 d = data_add_marker(d, TYPE_NONE, NULL);
84 while (!feof(f) && (d.len < maxlen)) {
85 size_t chunksize, ret;
86
87 if (maxlen == (size_t)-1)
88 chunksize = 4096;
89 else
90 chunksize = maxlen - d.len;
91
92 d = data_grow_for(d, chunksize);
93 ret = fread(d.val + d.len, 1, chunksize, f);
94
95 if (ferror(f))
96 die("Error reading file into data: %s", strerror(errno));
97
98 if (d.len + ret < d.len)
99 die("Overflow reading file into data\n");
100
101 d.len += ret;
102 }
103
104 return d;
105}
106
107struct data data_append_data(struct data d, const void *p, int len)
108{
109 d = data_grow_for(d, len);
110 memcpy(d.val + d.len, p, len);
111 d.len += len;
112 return d;
113}
114
115struct data data_insert_at_marker(struct data d, struct marker *m,
116 const void *p, int len)
117{
118 d = data_grow_for(d, len);
119 memmove(d.val + m->offset + len, d.val + m->offset, d.len - m->offset);
120 memcpy(d.val + m->offset, p, len);
121 d.len += len;
122
123 /* Adjust all markers after the one we're inserting at */
124 m = m->next;
125 for_each_marker(m)
126 m->offset += len;
127 return d;
128}
129
130static struct data data_append_markers(struct data d, struct marker *m)
131{
132 struct marker **mp = &d.markers;
133
134 /* Find the end of the markerlist */
135 while (*mp)
136 mp = &((*mp)->next);
137 *mp = m;
138 return d;
139}
140
141struct data data_merge(struct data d1, struct data d2)
142{
143 struct data d;
144 struct marker *m2 = d2.markers;
145
146 d = data_append_markers(data_append_data(d1, d2.val, d2.len), m2);
147
148 /* Adjust for the length of d1 */
149 for_each_marker(m2)
150 m2->offset += d1.len;
151
152 d2.markers = NULL; /* So data_free() doesn't clobber them */
153 data_free(d2);
154
155 return d;
156}
157
158struct data data_append_integer(struct data d, uint64_t value, int bits)
159{
160 uint8_t value_8;
161 fdt16_t value_16;
162 fdt32_t value_32;
163 fdt64_t value_64;
164
165 switch (bits) {
166 case 8:
167 value_8 = value;
168 return data_append_data(d, &value_8, 1);
169
170 case 16:
171 value_16 = cpu_to_fdt16(value);
172 return data_append_data(d, &value_16, 2);
173
174 case 32:
175 value_32 = cpu_to_fdt32(value);
176 return data_append_data(d, &value_32, 4);
177
178 case 64:
179 value_64 = cpu_to_fdt64(value);
180 return data_append_data(d, &value_64, 8);
181
182 default:
183 die("Invalid literal size (%d)\n", bits);
184 }
185}
186
187struct data data_append_re(struct data d, uint64_t address, uint64_t size)
188{
189 struct fdt_reserve_entry re;
190
191 re.address = cpu_to_fdt64(address);
192 re.size = cpu_to_fdt64(size);
193
194 return data_append_data(d, &re, sizeof(re));
195}
196
197struct data data_append_cell(struct data d, cell_t word)
198{
199 return data_append_integer(d, word, sizeof(word) * 8);
200}
201
202struct data data_append_addr(struct data d, uint64_t addr)
203{
204 return data_append_integer(d, addr, sizeof(addr) * 8);
205}
206
207struct data data_append_byte(struct data d, uint8_t byte)
208{
209 return data_append_data(d, &byte, 1);
210}
211
212struct data data_append_zeroes(struct data d, int len)
213{
214 d = data_grow_for(d, len);
215
216 memset(d.val + d.len, 0, len);
217 d.len += len;
218 return d;
219}
220
221struct data data_append_align(struct data d, int align)
222{
223 int newlen = ALIGN(d.len, align);
224 return data_append_zeroes(d, newlen - d.len);
225}
226
227struct data data_add_marker(struct data d, enum markertype type, char *ref)
228{
229 struct marker *m;
230
231 m = xmalloc(sizeof(*m));
232 m->offset = d.len;
233 m->type = type;
234 m->ref = ref;
235 m->next = NULL;
236
237 return data_append_markers(d, m);
238}
239
240bool data_is_one_string(struct data d)
241{
242 int i;
243 int len = d.len;
244
245 if (len == 0)
246 return false;
247
248 for (i = 0; i < len-1; i++)
249 if (d.val[i] == '\0')
250 return false;
251
252 if (d.val[len-1] != '\0')
253 return false;
254
255 return true;
256}