1 // Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the LICENSE file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
10 #include "EbmlWriter.h"
16 #define LITERALU64(n) n
18 #define LITERALU64(n) n##LLU
21 void Ebml_WriteLen(EbmlGlobal *glob, long long val) {
22 // TODO check and make sure we are not > than 0x0100000000000000LLU
23 unsigned char size = 8; // size in bytes to output
24 unsigned long long minVal = LITERALU64(0x00000000000000ff); // mask to compare for byte size
26 for (size = 1; size < 8; size ++) {
30 minVal = (minVal << 7);
33 val |= (LITERALU64(0x000000000000080) << ((size - 1) * 7));
35 Ebml_Serialize(glob, (void *) &val, sizeof(val), size);
38 void Ebml_WriteString(EbmlGlobal *glob, const char *str) {
39 const size_t size_ = strlen(str);
40 const unsigned long long size = size_;
41 Ebml_WriteLen(glob, size);
42 // TODO: it's not clear from the spec whether the nul terminator
43 // should be serialized too. For now we omit the null terminator.
44 Ebml_Write(glob, str, size);
47 void Ebml_WriteUTF8(EbmlGlobal *glob, const wchar_t *wstr) {
48 const size_t strlen = wcslen(wstr);
50 // TODO: it's not clear from the spec whether the nul terminator
51 // should be serialized too. For now we include it.
52 const unsigned long long size = strlen;
54 Ebml_WriteLen(glob, size);
55 Ebml_Write(glob, wstr, size);
58 void Ebml_WriteID(EbmlGlobal *glob, unsigned long class_id) {
61 if (class_id >= 0x01000000)
63 else if (class_id >= 0x00010000)
65 else if (class_id >= 0x00000100)
70 Ebml_Serialize(glob, (void *)&class_id, sizeof(class_id), len);
73 void Ebml_SerializeUnsigned64(EbmlGlobal *glob, unsigned long class_id, uint64_t ui) {
74 unsigned char sizeSerialized = 8 | 0x80;
75 Ebml_WriteID(glob, class_id);
76 Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
77 Ebml_Serialize(glob, &ui, sizeof(ui), 8);
80 void Ebml_SerializeUnsigned(EbmlGlobal *glob, unsigned long class_id, unsigned long ui) {
81 unsigned char size = 8; // size in bytes to output
82 unsigned char sizeSerialized = 0;
85 Ebml_WriteID(glob, class_id);
86 minVal = 0x7fLU; // mask to compare for byte size
88 for (size = 1; size < 4; size ++) {
96 sizeSerialized = 0x80 | size;
97 Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
98 Ebml_Serialize(glob, &ui, sizeof(ui), size);
100 // TODO: perhaps this is a poor name for this id serializer helper function
101 void Ebml_SerializeBinary(EbmlGlobal *glob, unsigned long class_id, unsigned long bin) {
103 for (size = 4; size > 1; size--) {
104 if (bin & 0x000000ff << ((size - 1) * 8))
107 Ebml_WriteID(glob, class_id);
108 Ebml_WriteLen(glob, size);
109 Ebml_WriteID(glob, bin);
112 void Ebml_SerializeFloat(EbmlGlobal *glob, unsigned long class_id, double d) {
113 unsigned char len = 0x88;
115 Ebml_WriteID(glob, class_id);
116 Ebml_Serialize(glob, &len, sizeof(len), 1);
117 Ebml_Serialize(glob, &d, sizeof(d), 8);
120 void Ebml_WriteSigned16(EbmlGlobal *glob, short val) {
121 signed long out = ((val & 0x003FFFFF) | 0x00200000) << 8;
122 Ebml_Serialize(glob, &out, sizeof(out), 3);
125 void Ebml_SerializeString(EbmlGlobal *glob, unsigned long class_id, const char *s) {
126 Ebml_WriteID(glob, class_id);
127 Ebml_WriteString(glob, s);
130 void Ebml_SerializeUTF8(EbmlGlobal *glob, unsigned long class_id, wchar_t *s) {
131 Ebml_WriteID(glob, class_id);
132 Ebml_WriteUTF8(glob, s);
135 void Ebml_SerializeData(EbmlGlobal *glob, unsigned long class_id, unsigned char *data, unsigned long data_length) {
136 Ebml_WriteID(glob, class_id);
137 Ebml_WriteLen(glob, data_length);
138 Ebml_Write(glob, data, data_length);
141 void Ebml_WriteVoid(EbmlGlobal *glob, unsigned long vSize) {
142 unsigned char tmp = 0;
145 Ebml_WriteID(glob, 0xEC);
146 Ebml_WriteLen(glob, vSize);
148 for (i = 0; i < vSize; i++) {
149 Ebml_Write(glob, &tmp, 1);
153 // TODO Serialize Date