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#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <assert.h>
#include "tagstruct.h"
enum tags {
TAG_STRING = 't',
TAG_U32 = 'L',
TAG_S32 = 'l',
TAG_U16 = 'S',
TAG_S16 = 's',
TAG_U8 = 'B',
TAG_S8 = 'b',
TAG_SAMPLE_SPEC = 'a'
};
struct tagstruct {
uint8_t *data;
size_t length, allocated;
size_t rindex;
int dynamic;
};
struct tagstruct *tagstruct_new(const uint8_t* data, size_t length) {
struct tagstruct*t;
assert(!data || (data && length));
t = malloc(sizeof(struct tagstruct));
assert(t);
t->data = (uint8_t*) data;
t->allocated = t->length = data ? length : 0;
t->rindex = 0;
t->dynamic = !data;
return t;
}
void tagstruct_free(struct tagstruct*t) {
assert(t);
if (t->dynamic)
free(t->data);
free(t);
}
uint8_t* tagstruct_free_data(struct tagstruct*t, size_t *l) {
uint8_t *p;
assert(t && t->dynamic && l);
p = t->data;
*l = t->length;
free(t);
return p;
}
static void extend(struct tagstruct*t, size_t l) {
assert(t && t->dynamic);
if (l <= t->allocated)
return;
t->data = realloc(t->data, t->allocated = l+100);
assert(t->data);
}
void tagstruct_puts(struct tagstruct*t, const char *s) {
size_t l;
assert(t && s);
l = strlen(s)+2;
extend(t, l);
t->data[t->length] = TAG_STRING;
strcpy(t->data+t->length+1, s);
t->length += l;
}
void tagstruct_putu32(struct tagstruct*t, uint32_t i) {
assert(t);
extend(t, 5);
t->data[t->length] = TAG_U32;
*((uint32_t*) (t->data+t->length+1)) = htonl(i);
t->length += 5;
}
void tagstruct_putu8(struct tagstruct*t, uint8_t c) {
assert(t);
extend(t, 2);
t->data[t->length] = TAG_U8;
*(t->data+t->length+1) = c;
t->length += 2;
}
void tagstruct_put_sample_spec(struct tagstruct *t, const struct pa_sample_spec *ss) {
assert(t && ss);
extend(t, 7);
t->data[t->length] = TAG_SAMPLE_SPEC;
t->data[t->length+1] = (uint8_t) ss->format;
t->data[t->length+2] = ss->channels;
*(uint32_t*) (t->data+t->length+3) = htonl(ss->rate);
t->length += 7;
}
int tagstruct_gets(struct tagstruct*t, const char **s) {
int error = 0;
size_t n;
char *c;
assert(t && s);
if (t->rindex+2 > t->length)
return -1;
if (t->data[t->rindex] != TAG_STRING)
return -1;
error = 1;
for (n = 0, c = (char*) (t->data+t->rindex+1); n < t->length-t->rindex-1; c++)
if (!*c) {
error = 0;
break;
}
if (error)
return -1;
*s = (char*) (t->data+t->rindex+1);
t->rindex += n+1;
return 0;
}
int tagstruct_getu32(struct tagstruct*t, uint32_t *i) {
assert(t && i);
if (t->rindex+5 > t->length)
return -1;
if (t->data[t->rindex] != TAG_U32)
return -1;
*i = ntohl(*((uint32_t*) (t->data+t->rindex+1)));
t->rindex += 5;
return 0;
}
int tagstruct_getu8(struct tagstruct*t, uint8_t *c) {
assert(t && c);
if (t->rindex+2 > t->length)
return -1;
if (t->data[t->rindex] != TAG_U8)
return -1;
*c = t->data[t->rindex+1];
t->rindex +=2;
return 0;
}
int tagstruct_get_sample_spec(struct tagstruct *t, struct pa_sample_spec *ss) {
assert(t && ss);
if (t->rindex+7 > t->length)
return -1;
if (t->data[t->rindex] != TAG_SAMPLE_SPEC)
return -1;
ss->format = t->data[t->rindex+1];
ss->channels = t->data[t->rindex+2];
ss->rate = ntohl(*(uint32_t*) (t->data+t->rindex+3));
t->rindex += 7;
return 0;
}
int tagstruct_eof(struct tagstruct*t) {
assert(t);
return t->rindex >= t->length;
}
const uint8_t* tagstruct_data(struct tagstruct*t, size_t *l) {
assert(t && t->dynamic && l);
*l = t->length;
return t->data;
}
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