1 files changed, 79 insertions, 0 deletions
diff --git a/media/libmkv/EbmlBufferWriter.c b/media/libmkv/EbmlBufferWriter.c
new file mode 100644
index 000000000..59255042c
--- /dev/null
+++ b/media/libmkv/EbmlBufferWriter.c
@@ -0,0 +1,79 @@
+// #include <strmif.h>
+#include "EbmlBufferWriter.h"
+#include "EbmlWriter.h"
+// #include <cassert>
+// #include <limits>
+// #include <malloc.h>  //_alloca
+#include <stdlib.h>
+#include <wchar.h>
+#include <string.h>
+
+void
+Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, int buffer_size, unsigned long len)
+{
+  /* buffer_size:
+   * 1 - int8_t;
+   * 2 - int16_t;
+   * 4 - int32_t;
+   * 8 - int64_t;
+   */
+  long i;
+  for(i = len-1; i >= 0; i--) {
+    unsigned char x;
+    if (buffer_size == 1) {
+      x = (char)(*(const int8_t *)buffer_in >> (i * 8));
+    } else if (buffer_size == 2) {
+      x = (char)(*(const int16_t *)buffer_in >> (i * 8));
+    } else if (buffer_size == 4) {
+      x = (char)(*(const int32_t *)buffer_in >> (i * 8));
+    } else if (buffer_size == 8) {
+      x = (char)(*(const int64_t *)buffer_in >> (i * 8));
+    }
+    Ebml_Write(glob, &x, 1);
+  }
+}
+
+void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
+  unsigned char *src = glob->buf;
+  src += glob->offset;
+  memcpy(src, buffer_in, len);
+  glob->offset += len;
+}
+
+static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) {
+  while (q != p) {
+    --q;
+
+    memcpy(&(glob->buf[glob->offset]), q, 1);
+    glob->offset++;
+  }
+}
+
+/*
+void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
+  // assert(buf);
+
+  const unsigned char *const p = (const unsigned char *)(buffer_in);
+  const unsigned char *const q = p + len;
+
+  _Serialize(glob, p, q);
+}
+*/
+
+void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) {
+  unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLL;
+  Ebml_WriteID(glob, class_id);
+  ebmlLoc->offset = glob->offset;
+  // todo this is always taking 8 bytes, this may need later optimization
+  Ebml_Serialize(glob, (void *)&unknownLen,sizeof(unknownLen), 8); // this is a key that says length unknown
+}
+
+void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
+  unsigned long long size = glob->offset - ebmlLoc->offset - 8;
+  unsigned long long curOffset = glob->offset;
+  glob->offset = ebmlLoc->offset;
+  size |=  0x0100000000000000LL;
+  Ebml_Serialize(glob, &size,sizeof(size), 8);
+  glob->offset = curOffset;
+}
+