private static unsafe int append_mem(minimp4_vector_t v, void *mem, int bytes)
{
int i;
var size = new byte[2];
var p = v.data;
for (i = 0; i + 2 < v.bytes;)
{
int cb = p[i] * 256 + p[i + 1];
var subarray = new byte[cb];
Array.Copy(p, i + 2, subarray, 0, cb);
if (cb == bytes && !memcmp(subarray, mem, cb))
{
return(1);
}
i += 2 + cb;
}
size[0] = (byte)(bytes >> 8);
size[1] = (byte)bytes;
fixed(byte *buf = size)
{
return(minimp4_vector_put(v, buf, 2) != -1 && minimp4_vector_put(v, mem, bytes) != -1 ? 1 : 0);
}
}
static bool minimp4_vector_grow(minimp4_vector_t h, int bytes)
{
byte[] p;
int new_size = h.capacity * 2 + 1024;
if (new_size < h.capacity + bytes)
{
new_size = h.capacity + bytes + 1024;
}
p = new byte[new_size];
if (p == null)
{
return(false);
}
unsafe
{
fixed(byte *pp = h.data)
{
memcpy(p, pp, h.capacity);
}
}
h.data = p;
h.capacity = new_size;
return(true);
}
private static bool minimp4_vector_init(minimp4_vector_t h, int capacity)
{
h.bytes = 0;
h.capacity = capacity;
h.data = capacity != 0 ? new byte[capacity] : null;
return(capacity == 0 || h.data == null);
}
private static unsafe int minimp4_vector_put(minimp4_vector_t h, void *buf, int bytes)
{
int tail = minimp4_vector_alloc_tail(h, bytes);
if (tail != -1)
{
fixed(byte *data = h.data) memcpy(data + tail, buf, bytes);
}
return(tail);
}
private static unsafe int minimp4_vector_alloc_tail(minimp4_vector_t h, int bytes)
{
if (h.data == null && !minimp4_vector_init(h, 2 * bytes + 1024))
{
return(-1);
}
if (h.capacity - h.bytes < bytes && !minimp4_vector_grow(h, bytes))
{
return(-1);
}
Debug.Assert(h.data != null);
Debug.Assert(h.capacity - h.bytes >= bytes);
int p = h.bytes;
h.bytes += bytes;
return(p);
}