scripts/dtc/data.c

   1 /*
   2  * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  18  *                                                                   USA
  19  */
  20
  21 #include "dtc.h"
  22
  23 void data_free(struct data d)
  24 {
  25         struct marker *m, *nm;
  26
  27         m = d.markers;
  28         while (m) {
  29                 nm = m->next;
  30                 free(m->ref);
  31                 free(m);
  32                 m = nm;
  33         }
  34
  35         if (d.val)
  36                 free(d.val);
  37 }
  38
  39 struct data data_grow_for(struct data d, int xlen)
  40 {
  41         struct data nd;
  42         int newsize;
  43
  44         if (xlen == 0)
  45                 return d;
  46
  47         nd = d;
  48
  49         newsize = xlen;
  50
  51         while ((d.len + xlen) > newsize)
  52                 newsize *= 2;
  53
  54         nd.val = xrealloc(d.val, newsize);
  55
  56         return nd;
  57 }
  58
  59 struct data data_copy_mem(const char *mem, int len)
  60 {
  61         struct data d;
  62
  63         d = data_grow_for(empty_data, len);
  64
  65         d.len = len;
  66         memcpy(d.val, mem, len);
  67
  68         return d;
  69 }
  70
  71 struct data data_copy_escape_string(const char *s, int len)
  72 {
  73         int i = 0;
  74         struct data d;
  75         char *q;
  76
  77         d = data_grow_for(empty_data, strlen(s)+1);
  78
  79         q = d.val;
  80         while (i < len) {
  81                 char c = s[i++];
  82
  83                 if (c == '\\')
  84                         c = get_escape_char(s, &i);
  85
  86                 q[d.len++] = c;
  87         }
  88
  89         q[d.len++] = '\0';
  90         return d;
  91 }
  92
  93 struct data data_copy_file(FILE *f, size_t maxlen)
  94 {
  95         struct data d = empty_data;
  96
  97         while (!feof(f) && (d.len < maxlen)) {
  98                 size_t chunksize, ret;
  99
 100                 if (maxlen == -1)
 101                         chunksize = 4096;
 102                 else
 103                         chunksize = maxlen - d.len;
 104
 105                 d = data_grow_for(d, chunksize);
 106                 ret = fread(d.val + d.len, 1, chunksize, f);
 107
 108                 if (ferror(f))
 109                         die("Error reading file into data: %s", strerror(errno));
 110
 111                 if (d.len + ret < d.len)
 112                         die("Overflow reading file into data\n");
 113
 114                 d.len += ret;
 115         }
 116
 117         return d;
 118 }
 119
 120 struct data data_append_data(struct data d, const void *p, int len)
 121 {
 122         d = data_grow_for(d, len);
 123         memcpy(d.val + d.len, p, len);
 124         d.len += len;
 125         return d;
 126 }
 127
 128 struct data data_insert_at_marker(struct data d, struct marker *m,
 129                                   const void *p, int len)
 130 {
 131         d = data_grow_for(d, len);
 132         memmove(d.val + m->offset + len, d.val + m->offset, d.len - m->offset);
 133         memcpy(d.val + m->offset, p, len);
 134         d.len += len;
 135
 136         /* Adjust all markers after the one we're inserting at */
 137         m = m->next;
 138         for_each_marker(m)
 139                 m->offset += len;
 140         return d;
 141 }
 142
 143 static struct data data_append_markers(struct data d, struct marker *m)
 144 {
 145         struct marker **mp = &d.markers;
 146
 147         /* Find the end of the markerlist */
 148         while (*mp)
 149                 mp = &((*mp)->next);
 150         *mp = m;
 151         return d;
 152 }
 153
 154 struct data data_merge(struct data d1, struct data d2)
 155 {
 156         struct data d;
 157         struct marker *m2 = d2.markers;
 158
 159         d = data_append_markers(data_append_data(d1, d2.val, d2.len), m2);
 160
 161         /* Adjust for the length of d1 */
 162         for_each_marker(m2)
 163                 m2->offset += d1.len;
 164
 165         d2.markers = NULL; /* So data_free() doesn't clobber them */
 166         data_free(d2);
 167
 168         return d;
 169 }
 170
 171 struct data data_append_integer(struct data d, uint64_t value, int bits)
 172 {
 173         uint8_t value_8;
 174         uint16_t value_16;
 175         uint32_t value_32;
 176         uint64_t value_64;
 177
 178         switch (bits) {
 179         case 8:
 180                 value_8 = value;
 181                 return data_append_data(d, &value_8, 1);
 182
 183         case 16:
 184                 value_16 = cpu_to_fdt16(value);
 185                 return data_append_data(d, &value_16, 2);
 186
 187         case 32:
 188                 value_32 = cpu_to_fdt32(value);
 189                 return data_append_data(d, &value_32, 4);
 190
 191         case 64:
 192                 value_64 = cpu_to_fdt64(value);
 193                 return data_append_data(d, &value_64, 8);
 194
 195         default:
 196                 die("Invalid literal size (%d)\n", bits);
 197         }
 198 }
 199
 200 struct data data_append_re(struct data d, const struct fdt_reserve_entry *re)
 201 {
 202         struct fdt_reserve_entry bere;
 203
 204         bere.address = cpu_to_fdt64(re->address);
 205         bere.size = cpu_to_fdt64(re->size);
 206
 207         return data_append_data(d, &bere, sizeof(bere));
 208 }
 209
 210 struct data data_append_cell(struct data d, cell_t word)
 211 {
 212         return data_append_integer(d, word, sizeof(word) * 8);
 213 }
 214
 215 struct data data_append_addr(struct data d, uint64_t addr)
 216 {
 217         return data_append_integer(d, addr, sizeof(addr) * 8);
 218 }
 219
 220 struct data data_append_byte(struct data d, uint8_t byte)
 221 {
 222         return data_append_data(d, &byte, 1);
 223 }
 224
 225 struct data data_append_zeroes(struct data d, int len)
 226 {
 227         d = data_grow_for(d, len);
 228
 229         memset(d.val + d.len, 0, len);
 230         d.len += len;
 231         return d;
 232 }
 233
 234 struct data data_append_align(struct data d, int align)
 235 {
 236         int newlen = ALIGN(d.len, align);
 237         return data_append_zeroes(d, newlen - d.len);
 238 }
 239
 240 struct data data_add_marker(struct data d, enum markertype type, char *ref)
 241 {
 242         struct marker *m;
 243
 244         m = xmalloc(sizeof(*m));
 245         m->offset = d.len;
 246         m->type = type;
 247         m->ref = ref;
 248         m->next = NULL;
 249
 250         return data_append_markers(d, m);
 251 }
 252
 253 int data_is_one_string(struct data d)
 254 {
 255         int i;
 256         int len = d.len;
 257
 258         if (len == 0)
 259                 return 0;
 260
 261         for (i = 0; i < len-1; i++)
 262                 if (d.val[i] == '\0')
 263                         return 0;
 264
 265         if (d.val[len-1] != '\0')
 266                 return 0;
 267
 268         return 1;
 269 }