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1 // #include <strmif.h> | |
2 #include "EbmlBufferWriter.h" | |
3 #include "EbmlWriter.h" | |
4 // #include <cassert> | |
5 // #include <limits> | |
6 // #include <malloc.h> //_alloca | |
7 #include <stdlib.h> | |
8 #include <wchar.h> | |
9 #include <string.h> | |
10 | |
11 void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) { | |
12 unsigned char *src = glob->buf; | |
13 src += glob->offset; | |
14 memcpy(src, buffer_in, len); | |
15 glob->offset += len; | |
16 } | |
17 | |
18 static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned
char *q) { | |
19 while (q != p) { | |
20 --q; | |
21 memcpy(&(glob->buf[glob->offset]), q, 1); | |
22 glob->offset++; | |
23 } | |
24 } | |
25 | |
26 void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len)
{ | |
27 // assert(buf); | |
28 | |
29 const unsigned char *const p = (const unsigned char *)(buffer_in); | |
30 const unsigned char *const q = p + len; | |
31 | |
32 _Serialize(glob, p, q); | |
33 } | |
34 | |
35 | |
36 void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long clas
s_id) { | |
37 Ebml_WriteID(glob, class_id); | |
38 ebmlLoc->offset = glob->offset; | |
39 // todo this is always taking 8 bytes, this may need later optimization | |
40 unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLLU; | |
41 Ebml_Serialize(glob, (void *)&unknownLen, 8); // this is a key that says lengh
t unknown | |
42 } | |
43 | |
44 void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) { | |
45 unsigned long long size = glob->offset - ebmlLoc->offset - 8; | |
46 unsigned long long curOffset = glob->offset; | |
47 glob->offset = ebmlLoc->offset; | |
48 size |= 0x0100000000000000LLU; | |
49 Ebml_Serialize(glob, &size, 8); | |
50 glob->offset = curOffset; | |
51 } | |
52 | |
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