static void
ngx_rtmp_eval_append_var(void *ctx, ngx_buf_t *b, ngx_rtmp_eval_t **e,
ngx_str_t *name, ngx_log_t *log)
{
ngx_uint_t k;
ngx_str_t v;
ngx_rtmp_eval_t *ee;
for (; *e; ++e) {
for (k = 0, ee = *e; ee->handler; ++k, ++ee) {
if (ee->name.len == name->len &&
ngx_memcmp(ee->name.data, name->data, name->len) == 0)
{
ee->handler(ctx, ee, &v);
ngx_rtmp_eval_append(b, v.data, v.len, log);
}
}
}
}
static void
ngx_rtmp_eval_append_var(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_eval_t **e, ngx_str_t *name)
{
ngx_uint_t k;
ngx_str_t v;
ngx_rtmp_eval_t *ee;
for (; *e; ++e) {
for (k = 0, ee = *e; ee->handler; ++k, ++ee) {
if (ee->name.len == name->len &&
ngx_memcmp(ee->name.data, name->data, name->len) == 0)
{
ee->handler(s, ee, &v);
ngx_rtmp_eval_append(s, b, v.data, v.len);
}
}
}
}
ngx_int_t
ngx_rtmp_eval(void *ctx, ngx_str_t *in, ngx_rtmp_eval_t **e, ngx_str_t *out,
ngx_log_t *log)
{
u_char c, *p;
ngx_str_t name;
ngx_buf_t b;
ngx_uint_t n;
enum {
NORMAL,
ESCAPE,
NAME,
SNAME
} state = NORMAL;
b.pos = b.last = b.start = ngx_alloc(NGX_RTMP_EVAL_BUFLEN, log);
if (b.pos == NULL) {
return NGX_ERROR;
}
b.end = b.pos + NGX_RTMP_EVAL_BUFLEN;
name.data = NULL;
for (n = 0; n < in->len; ++n) {
p = &in->data[n];
c = *p;
switch (state) {
case SNAME:
if (c != '}') {
continue;
}
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
state = NORMAL;
continue;
case NAME:
if (c == '{' && name.data == p) {
++name.data;
state = SNAME;
continue;
}
if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
continue;
}
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
case NORMAL:
switch (c) {
case '$':
name.data = p + 1;
state = NAME;
continue;
case '\\':
state = ESCAPE;
continue;
}
case ESCAPE:
ngx_rtmp_eval_append(&b, &c, 1, log);
state = NORMAL;
break;
}
}
if (state == NAME) {
p = &in->data[n];
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
}
c = 0;
ngx_rtmp_eval_append(&b, &c, 1, log);
out->data = b.pos;
out->len = b.last - b.pos - 1;
return NGX_OK;
}