media/libmkv/EbmlBufferWriter.c@6474c204b198
media/libmkv/EbmlBufferWriter.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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>
11 void
12 Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, int buffer_size, unsigned long len)
13 {
14 /* buffer_size:
15 * 1 - int8_t;
16 * 2 - int16_t;
17 * 3 - int32_t;
18 * 4 - int64_t;
19 */
20 long i;
21 for(i = len-1; i >= 0; i--) {
22 unsigned char x;
23 if (buffer_size == 1) {
24 x = (char)(*(const int8_t *)buffer_in >> (i * 8));
25 } else if (buffer_size == 2) {
26 x = (char)(*(const int16_t *)buffer_in >> (i * 8));
27 } else if (buffer_size == 4) {
28 x = (char)(*(const int32_t *)buffer_in >> (i * 8));
29 } else if (buffer_size == 8) {
30 x = (char)(*(const int64_t *)buffer_in >> (i * 8));
31 }
32 Ebml_Write(glob, &x, 1);
33 }
34 }
36 void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
37 unsigned char *src = glob->buf;
38 src += glob->offset;
39 memcpy(src, buffer_in, len);
40 glob->offset += len;
41 }
43 static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) {
44 while (q != p) {
45 --q;
47 memcpy(&(glob->buf[glob->offset]), q, 1);
48 glob->offset++;
49 }
50 }
52 /*
53 void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
54 // assert(buf);
56 const unsigned char *const p = (const unsigned char *)(buffer_in);
57 const unsigned char *const q = p + len;
59 _Serialize(glob, p, q);
60 }
61 */
63 void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) {
64 unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLL;
65 Ebml_WriteID(glob, class_id);
66 ebmlLoc->offset = glob->offset;
67 // todo this is always taking 8 bytes, this may need later optimization
68 Ebml_Serialize(glob, (void *)&unknownLen,sizeof(unknownLen), 8); // this is a key that says lenght unknown
69 }
71 void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
72 unsigned long long size = glob->offset - ebmlLoc->offset - 8;
73 unsigned long long curOffset = glob->offset;
74 glob->offset = ebmlLoc->offset;
75 size |= 0x0100000000000000LL;
76 Ebml_Serialize(glob, &size,sizeof(size), 8);
77 glob->offset = curOffset;
78 }
