static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) { DynBuffer *d = opaque; int new_size, new_allocated_size; /* reallocate buffer if needed */ new_size = d->pos + buf_size; new_allocated_size = d->allocated_size; if(new_size < d->pos || new_size > INT_MAX/2) return -1; while (new_size > new_allocated_size) { if (!new_allocated_size) new_allocated_size = new_size; else new_allocated_size += new_allocated_size / 2 + 1; } if (new_allocated_size > d->allocated_size) { d->buffer = av_realloc(d->buffer, new_allocated_size); if(d->buffer == NULL) return -1234; d->allocated_size = new_allocated_size; } memcpy(d->buffer + d->pos, buf, buf_size); d->pos = new_size; if (d->pos > d->size) d->size = d->pos; return buf_size; }