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media/libmkv/EbmlWriter.c@ac0c01689b40 (annotated)

media/libmkv/EbmlWriter.c

Thu, 15 Jan 2015 15:59:08 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 15 Jan 2015 15:59:08 +0100
branch
TOR_BUG_9701
changeset 10
ac0c01689b40
permissions
-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 /*
michael@0 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0 3 *
michael@0 4 * Use of this source code is governed by a BSD-style license
michael@0 5 * that can be found in the LICENSE file in the root of the source
michael@0 6 * tree. An additional intellectual property rights grant can be found
michael@0 7 * in the file PATENTS. All contributing project authors may
michael@0 8 * be found in the AUTHORS file in the root of the source tree.
michael@0 9 */
michael@0 10 #include "EbmlWriter.h"
michael@0 11 #include <stdlib.h>
michael@0 12 #include <wchar.h>
michael@0 13 #include <string.h>
michael@0 14 #include <limits.h>
michael@0 15 #include "EbmlBufferWriter.h"
michael@0 16 #if defined(_MSC_VER)
michael@0 17 #define LITERALU64(n) n
michael@0 18 #else
michael@0 19 #define LITERALU64(n) n##LLU
michael@0 20 #endif
michael@0 21
michael@0 22 void Ebml_WriteLen(EbmlGlobal *glob, int64_t val) {
michael@0 23 /* TODO check and make sure we are not > than 0x0100000000000000LLU */
michael@0 24 unsigned char size = 8; /* size in bytes to output */
michael@0 25
michael@0 26 /* mask to compare for byte size */
michael@0 27 int64_t minVal = 0xff;
michael@0 28
michael@0 29 for (size = 1; size < 8; size ++) {
michael@0 30 if (val < minVal)
michael@0 31 break;
michael@0 32
michael@0 33 minVal = (minVal << 7);
michael@0 34 }
michael@0 35
michael@0 36 val |= (((uint64_t)0x80) << ((size - 1) * 7));
michael@0 37
michael@0 38 Ebml_Serialize(glob, (void *) &val, sizeof(val), size);
michael@0 39 }
michael@0 40
michael@0 41 void Ebml_WriteString(EbmlGlobal *glob, const char *str) {
michael@0 42 const size_t size_ = strlen(str);
michael@0 43 const uint64_t size = size_;
michael@0 44 Ebml_WriteLen(glob, size);
michael@0 45 /* TODO: it's not clear from the spec whether the nul terminator
michael@0 46 * should be serialized too. For now we omit the null terminator.
michael@0 47 */
michael@0 48 Ebml_Write(glob, str, (unsigned long)size);
michael@0 49 }
michael@0 50
michael@0 51 void Ebml_WriteUTF8(EbmlGlobal *glob, const wchar_t *wstr) {
michael@0 52 const size_t strlen = wcslen(wstr);
michael@0 53
michael@0 54 /* TODO: it's not clear from the spec whether the nul terminator
michael@0 55 * should be serialized too. For now we include it.
michael@0 56 */
michael@0 57 const uint64_t size = strlen;
michael@0 58
michael@0 59 Ebml_WriteLen(glob, size);
michael@0 60 Ebml_Write(glob, wstr, (unsigned long)size);
michael@0 61 }
michael@0 62
michael@0 63 void Ebml_WriteID(EbmlGlobal *glob, unsigned long class_id) {
michael@0 64 int len;
michael@0 65
michael@0 66 if (class_id >= 0x01000000)
michael@0 67 len = 4;
michael@0 68 else if (class_id >= 0x00010000)
michael@0 69 len = 3;
michael@0 70 else if (class_id >= 0x00000100)
michael@0 71 len = 2;
michael@0 72 else
michael@0 73 len = 1;
michael@0 74
michael@0 75 Ebml_Serialize(glob, (void *)&class_id, sizeof(class_id), len);
michael@0 76 }
michael@0 77
michael@0 78 void Ebml_SerializeUnsigned32(EbmlGlobal *glob, unsigned long class_id, uint32_t ui) {
michael@0 79 unsigned char sizeSerialized = 8 | 0x80;
michael@0 80 Ebml_WriteID(glob, class_id);
michael@0 81 Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
michael@0 82 Ebml_Serialize(glob, &ui, sizeof(ui), 4);
michael@0 83 }
michael@0 84
michael@0 85 void Ebml_SerializeUnsigned64(EbmlGlobal *glob, unsigned long class_id, uint64_t ui) {
michael@0 86 unsigned char sizeSerialized = 8 | 0x80;
michael@0 87 Ebml_WriteID(glob, class_id);
michael@0 88 Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
michael@0 89 Ebml_Serialize(glob, &ui, sizeof(ui), 8);
michael@0 90 }
michael@0 91
michael@0 92 void Ebml_SerializeUnsigned(EbmlGlobal *glob, unsigned long class_id, unsigned long ui) {
michael@0 93 unsigned char size = 8; /* size in bytes to output */
michael@0 94 unsigned char sizeSerialized = 0;
michael@0 95 unsigned long minVal;
michael@0 96
michael@0 97 Ebml_WriteID(glob, class_id);
michael@0 98 minVal = 0x7fLU; /* mask to compare for byte size */
michael@0 99
michael@0 100 for (size = 1; size < 4; size ++) {
michael@0 101 if (ui < minVal) {
michael@0 102 break;
michael@0 103 }
michael@0 104
michael@0 105 minVal <<= 7;
michael@0 106 }
michael@0 107
michael@0 108 sizeSerialized = 0x80 | size;
michael@0 109 Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
michael@0 110 Ebml_Serialize(glob, &ui, sizeof(ui), size);
michael@0 111 }
michael@0 112 /* TODO: perhaps this is a poor name for this id serializer helper function */
michael@0 113 void Ebml_SerializeBinary(EbmlGlobal *glob, unsigned long class_id, unsigned long bin) {
michael@0 114 int size;
michael@0 115 for (size = 4; size > 1; size--) {
michael@0 116 if (bin & (unsigned int)0x000000ff << ((size - 1) * 8))
michael@0 117 break;
michael@0 118 }
michael@0 119 Ebml_WriteID(glob, class_id);
michael@0 120 Ebml_WriteLen(glob, size);
michael@0 121 Ebml_WriteID(glob, bin);
michael@0 122 }
michael@0 123
michael@0 124 void Ebml_SerializeFloat(EbmlGlobal *glob, unsigned long class_id, double d) {
michael@0 125 unsigned char len = 0x88;
michael@0 126
michael@0 127 Ebml_WriteID(glob, class_id);
michael@0 128 Ebml_Serialize(glob, &len, sizeof(len), 1);
michael@0 129 Ebml_Serialize(glob, &d, sizeof(d), 8);
michael@0 130 }
michael@0 131
michael@0 132 void Ebml_WriteSigned16(EbmlGlobal *glob, short val) {
michael@0 133 signed long out = ((val & 0x003FFFFF) | 0x00200000) << 8;
michael@0 134 Ebml_Serialize(glob, &out, sizeof(out), 3);
michael@0 135 }
michael@0 136
michael@0 137 void Ebml_SerializeString(EbmlGlobal *glob, unsigned long class_id, const char *s) {
michael@0 138 Ebml_WriteID(glob, class_id);
michael@0 139 Ebml_WriteString(glob, s);
michael@0 140 }
michael@0 141
michael@0 142 void Ebml_SerializeUTF8(EbmlGlobal *glob, unsigned long class_id, wchar_t *s) {
michael@0 143 Ebml_WriteID(glob, class_id);
michael@0 144 Ebml_WriteUTF8(glob, s);
michael@0 145 }
michael@0 146
michael@0 147 void Ebml_SerializeData(EbmlGlobal *glob, unsigned long class_id, unsigned char *data, unsigned long data_length) {
michael@0 148 Ebml_WriteID(glob, class_id);
michael@0 149 Ebml_WriteLen(glob, data_length);
michael@0 150 Ebml_Write(glob, data, data_length);
michael@0 151 }
michael@0 152
michael@0 153 void Ebml_WriteVoid(EbmlGlobal *glob, unsigned long vSize) {
michael@0 154 unsigned char tmp = 0;
michael@0 155 unsigned long i = 0;
michael@0 156
michael@0 157 Ebml_WriteID(glob, 0xEC);
michael@0 158 Ebml_WriteLen(glob, vSize);
michael@0 159
michael@0 160 for (i = 0; i < vSize; i++) {
michael@0 161 Ebml_Write(glob, &tmp, 1);
michael@0 162 }
michael@0 163 }
michael@0 164
michael@0 165 /* TODO Serialize Date */

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