code.delx.au - pulseaudio/blob - polyp/tagstruct.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <netinet/in.h>
  29 #include <assert.h>
  30
  31 #include "tagstruct.h"
  32
  33 enum tags {
  34     TAG_STRING = 't',
  35     TAG_U32 = 'L',
  36     TAG_S32 = 'l',
  37     TAG_U16 = 'S',
  38     TAG_S16 = 's',
  39     TAG_U8 = 'B',
  40     TAG_S8 = 'b',
  41     TAG_SAMPLE_SPEC = 'a',
  42     TAG_ARBITRARY = 'x'
  43 };
  44
  45 struct pa_tagstruct {
  46     uint8_t *data;
  47     size_t length, allocated;
  48     size_t rindex;
  49
  50     int dynamic;
  51 };
  52
  53 struct pa_tagstruct *pa_tagstruct_new(const uint8_t* data, size_t length) {
  54     struct pa_tagstruct*t;
  55
  56     assert(!data || (data && length));
  57
  58     t = malloc(sizeof(struct pa_tagstruct));
  59     assert(t);
  60     t->data = (uint8_t*) data;
  61     t->allocated = t->length = data ? length : 0;
  62     t->rindex = 0;
  63     t->dynamic = !data;
  64     return t;
  65 }
  66
  67 void pa_tagstruct_free(struct pa_tagstruct*t) {
  68     assert(t);
  69     if (t->dynamic)
  70         free(t->data);
  71     free(t);
  72 }
  73
  74 uint8_t* pa_tagstruct_free_data(struct pa_tagstruct*t, size_t *l) {
  75     uint8_t *p;
  76     assert(t && t->dynamic && l);
  77     p = t->data;
  78     *l = t->length;
  79     free(t);
  80     return p;
  81 }
  82
  83 static void extend(struct pa_tagstruct*t, size_t l) {
  84     assert(t && t->dynamic);
  85
  86     if (l <= t->allocated)
  87         return;
  88
  89     t->data = realloc(t->data, t->allocated = l+100);
  90     assert(t->data);
  91 }
  92
  93 void pa_tagstruct_puts(struct pa_tagstruct*t, const char *s) {
  94     size_t l;
  95     assert(t && s);
  96     l = strlen(s)+2;
  97     extend(t, l);
  98     t->data[t->length] = TAG_STRING;
  99     strcpy(t->data+t->length+1, s);
 100     t->length += l;
 101 }
 102
 103 void pa_tagstruct_putu32(struct pa_tagstruct*t, uint32_t i) {
 104     assert(t);
 105     extend(t, 5);
 106     t->data[t->length] = TAG_U32;
 107     *((uint32_t*) (t->data+t->length+1)) = htonl(i);
 108     t->length += 5;
 109 }
 110
 111 void pa_tagstruct_putu8(struct pa_tagstruct*t, uint8_t c) {
 112     assert(t);
 113     extend(t, 2);
 114     t->data[t->length] = TAG_U8;
 115     *(t->data+t->length+1) = c;
 116     t->length += 2;
 117 }
 118
 119 void pa_tagstruct_put_sample_spec(struct pa_tagstruct *t, const struct pa_sample_spec *ss) {
 120     assert(t && ss);
 121     extend(t, 7);
 122     t->data[t->length] = TAG_SAMPLE_SPEC;
 123     t->data[t->length+1] = (uint8_t) ss->format;
 124     t->data[t->length+2] = ss->channels;
 125     *(uint32_t*) (t->data+t->length+3) = htonl(ss->rate);
 126     t->length += 7;
 127 }
 128
 129
 130 void pa_tagstruct_put_arbitrary(struct pa_tagstruct *t, const void *p, size_t length) {
 131     assert(t && p);
 132
 133     extend(t, 5+length);
 134     t->data[t->length] = TAG_ARBITRARY;
 135     *((uint32_t*) (t->data+t->length+1)) = htonl(length);
 136     if (length)
 137         memcpy(t->data+t->length+5, p, length);
 138     t->length += 5+length;
 139 }
 140
 141 int pa_tagstruct_gets(struct pa_tagstruct*t, const char **s) {
 142     int error = 0;
 143     size_t n;
 144     char *c;
 145     assert(t && s);
 146
 147     if (t->rindex+2 > t->length)
 148         return -1;
 149
 150     if (t->data[t->rindex] != TAG_STRING)
 151         return -1;
 152
 153     error = 1;
 154     for (n = 0, c = (char*) (t->data+t->rindex+1); t->rindex+1+n < t->length; n++, c++)
 155         if (!*c) {
 156             error = 0;
 157             break;
 158         }
 159
 160     if (error)
 161         return -1;
 162
 163     *s = (char*) (t->data+t->rindex+1);
 164
 165     t->rindex += n+2;
 166     return 0;
 167 }
 168
 169 int pa_tagstruct_getu32(struct pa_tagstruct*t, uint32_t *i) {
 170     assert(t && i);
 171
 172     if (t->rindex+5 > t->length)
 173         return -1;
 174
 175     if (t->data[t->rindex] != TAG_U32)
 176         return -1;
 177
 178     *i = ntohl(*((uint32_t*) (t->data+t->rindex+1)));
 179     t->rindex += 5;
 180     return 0;
 181 }
 182
 183 int pa_tagstruct_getu8(struct pa_tagstruct*t, uint8_t *c) {
 184     assert(t && c);
 185
 186     if (t->rindex+2 > t->length)
 187         return -1;
 188
 189     if (t->data[t->rindex] != TAG_U8)
 190         return -1;
 191
 192     *c = t->data[t->rindex+1];
 193     t->rindex +=2;
 194     return 0;
 195 }
 196
 197 int pa_tagstruct_get_sample_spec(struct pa_tagstruct *t, struct pa_sample_spec *ss) {
 198     assert(t && ss);
 199
 200     if (t->rindex+7 > t->length)
 201         return -1;
 202
 203     if (t->data[t->rindex] != TAG_SAMPLE_SPEC)
 204         return -1;
 205
 206     ss->format = t->data[t->rindex+1];
 207     ss->channels = t->data[t->rindex+2];
 208     ss->rate = ntohl(*(uint32_t*) (t->data+t->rindex+3));
 209
 210     t->rindex += 7;
 211     return 0;
 212 }
 213
 214 int pa_tagstruct_get_arbitrary(struct pa_tagstruct *t, const void **p, size_t length) {
 215     assert(t && p);
 216
 217     if (t->rindex+5+length > t->length)
 218         return -1;
 219
 220     if (t->data[t->rindex] != TAG_ARBITRARY)
 221         return -1;
 222
 223     if (ntohl(*((uint32_t*) (t->data+t->rindex+1))) != length)
 224         return -1;
 225
 226     *p = t->data+t->rindex+5;
 227     t->rindex += 5+length;
 228     return 0;
 229 }
 230
 231 int pa_tagstruct_eof(struct pa_tagstruct*t) {
 232     assert(t);
 233     return t->rindex >= t->length;
 234 }
 235
 236 const uint8_t* pa_tagstruct_data(struct pa_tagstruct*t, size_t *l) {
 237     assert(t && t->dynamic && l);
 238     *l = t->length;
 239     return t->data;
 240 }
 241