[45913] | 1 | /* $Id: EBMLWriter.cpp 69683 2017-11-14 11:09:16Z vboxsync $ */
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| 2 | /** @file
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[69683] | 3 | * EBMLWriter.cpp - EBML writer implementation.
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[45913] | 4 | */
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| 5 |
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| 6 | /*
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[65197] | 7 | * Copyright (C) 2013-2017 Oracle Corporation
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[45913] | 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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[68451] | 18 | /**
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| 19 | * For more information, see:
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| 20 | * - https://w3c.github.io/media-source/webm-byte-stream-format.html
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| 21 | * - https://www.webmproject.org/docs/container/#muxer-guidelines
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| 22 | */
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| 23 |
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[69683] | 24 | #ifdef LOG_GROUP
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| 25 | # undef LOG_GROUP
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| 26 | #endif
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[67914] | 27 | #define LOG_GROUP LOG_GROUP_MAIN_DISPLAY
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| 28 | #include "LoggingNew.h"
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[45913] | 29 |
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[52791] | 30 | #include <list>
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[65330] | 31 | #include <map>
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[69189] | 32 | #include <queue>
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[52791] | 33 | #include <stack>
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[65389] | 34 |
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| 35 | #include <math.h> /* For lround.h. */
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| 36 |
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[52791] | 37 | #include <iprt/asm.h>
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[65307] | 38 | #include <iprt/buildconfig.h>
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[52791] | 39 | #include <iprt/cdefs.h>
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[69189] | 40 | #include <iprt/critsect.h>
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[52791] | 41 | #include <iprt/err.h>
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[65256] | 42 | #include <iprt/file.h>
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| 43 | #include <iprt/rand.h>
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| 44 | #include <iprt/string.h>
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| 45 |
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[52791] | 46 | #include <VBox/log.h>
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[65307] | 47 | #include <VBox/version.h>
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[65256] | 48 |
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[69194] | 49 | #include "EBMLWriter.h"
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[69195] | 50 | #include "EBML_MKV.h"
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[45913] | 51 |
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[68796] | 52 | /** No flags set. */
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| 53 | #define VBOX_EBMLWRITER_FLAG_NONE 0
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| 54 | /** The file handle was inherited. */
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| 55 | #define VBOX_EBMLWRITER_FLAG_HANDLE_INHERITED RT_BIT(0)
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[52316] | 56 |
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[69683] | 57 | /** Creates an EBML output file using an existing, open file handle. */
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| 58 | int EBMLWriter::createEx(const char *a_pszFile, PRTFILE phFile)
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[52325] | 59 | {
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[69683] | 60 | AssertPtrReturn(phFile, VERR_INVALID_POINTER);
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[52325] | 61 |
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[69683] | 62 | m_hFile = *phFile;
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| 63 | m_fFlags |= VBOX_EBMLWRITER_FLAG_HANDLE_INHERITED;
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| 64 | m_strFile = a_pszFile;
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[45922] | 65 |
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[69683] | 66 | return VINF_SUCCESS;
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| 67 | }
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[52791] | 68 |
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[69683] | 69 | /** Creates an EBML output file using a file name. */
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| 70 | int EBMLWriter::create(const char *a_pszFile, uint64_t fOpen)
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| 71 | {
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| 72 | int rc = RTFileOpen(&m_hFile, a_pszFile, fOpen);
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| 73 | if (RT_SUCCESS(rc))
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[68796] | 74 | m_strFile = a_pszFile;
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| 75 |
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[69683] | 76 | return rc;
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| 77 | }
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[68796] | 78 |
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[69683] | 79 | /** Returns available space on storage. */
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| 80 | uint64_t EBMLWriter::getAvailableSpace(void)
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| 81 | {
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| 82 | RTFOFF pcbFree;
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| 83 | int rc = RTFileQueryFsSizes(m_hFile, NULL, &pcbFree, 0, 0);
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| 84 | return (RT_SUCCESS(rc)? (uint64_t)pcbFree : UINT64_MAX);
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| 85 | }
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[68332] | 86 |
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[69683] | 87 | /** Closes the file. */
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| 88 | void EBMLWriter::close(void)
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| 89 | {
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| 90 | if (!isOpen())
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| 91 | return;
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[45913] | 92 |
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[69683] | 93 | AssertMsg(m_Elements.size() == 0,
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| 94 | ("%zu elements are not closed yet (next element to close is 0x%x)\n",
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| 95 | m_Elements.size(), m_Elements.top().classId));
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[68332] | 96 |
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[69683] | 97 | if (!(m_fFlags & VBOX_EBMLWRITER_FLAG_HANDLE_INHERITED))
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[52791] | 98 | {
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[69683] | 99 | RTFileClose(m_hFile);
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| 100 | m_hFile = NIL_RTFILE;
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[52791] | 101 | }
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[45922] | 102 |
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[69683] | 103 | m_fFlags = VBOX_EBMLWRITER_FLAG_NONE;
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| 104 | m_strFile = "";
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| 105 | }
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[45913] | 106 |
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[69683] | 107 | /** Starts an EBML sub-element. */
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| 108 | EBMLWriter& EBMLWriter::subStart(EbmlClassId classId)
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| 109 | {
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| 110 | writeClassId(classId);
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| 111 | /* store the current file offset. */
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| 112 | m_Elements.push(EbmlSubElement(RTFileTell(m_hFile), classId));
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| 113 | /* Indicates that size of the element
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| 114 | * is unkown (as according to EBML specs).
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[65256] | 115 | */
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[69683] | 116 | writeUnsignedInteger(UINT64_C(0x01FFFFFFFFFFFFFF));
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| 117 | return *this;
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| 118 | }
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[65256] | 119 |
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[69683] | 120 | /** Ends an EBML sub-element. */
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| 121 | EBMLWriter& EBMLWriter::subEnd(EbmlClassId classId)
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| 122 | {
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[65261] | 123 | #ifdef VBOX_STRICT
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[69683] | 124 | /* Class ID on the top of the stack should match the class ID passed
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| 125 | * to the function. Otherwise it may mean that we have a bug in the code.
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[52791] | 126 | */
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[69683] | 127 | AssertMsg(!m_Elements.empty(), ("No elements to close anymore\n"));
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| 128 | AssertMsg(m_Elements.top().classId == classId,
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| 129 | ("Ending sub element 0x%x is in wrong order (next to close is 0x%x)\n", classId, m_Elements.top().classId));
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[65259] | 130 | #else
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[69683] | 131 | RT_NOREF(classId);
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[65259] | 132 | #endif
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[65256] | 133 |
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[69683] | 134 | uint64_t uPos = RTFileTell(m_hFile);
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| 135 | uint64_t uSize = uPos - m_Elements.top().offset - 8;
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| 136 | RTFileSeek(m_hFile, m_Elements.top().offset, RTFILE_SEEK_BEGIN, NULL);
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[68451] | 137 |
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[69683] | 138 | /* Make sure that size will be serialized as uint64_t. */
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| 139 | writeUnsignedInteger(uSize | UINT64_C(0x0100000000000000));
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| 140 | RTFileSeek(m_hFile, uPos, RTFILE_SEEK_BEGIN, NULL);
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| 141 | m_Elements.pop();
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| 142 | return *this;
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| 143 | }
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[68451] | 144 |
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[69683] | 145 | /** Serializes a null-terminated string. */
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| 146 | EBMLWriter& EBMLWriter::serializeString(EbmlClassId classId, const char *str)
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[52791] | 147 | {
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[69683] | 148 | writeClassId(classId);
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| 149 | uint64_t size = strlen(str);
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| 150 | writeSize(size);
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| 151 | write(str, size);
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| 152 | return *this;
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[52791] | 153 | }
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| 154 |
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[69683] | 155 | /** Serializes an UNSIGNED integer.
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| 156 | * If size is zero then it will be detected automatically. */
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| 157 | EBMLWriter& EBMLWriter::serializeUnsignedInteger(EbmlClassId classId, uint64_t parm, size_t size /* = 0 */)
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[68796] | 158 | {
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[69683] | 159 | writeClassId(classId);
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| 160 | if (!size) size = getSizeOfUInt(parm);
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| 161 | writeSize(size);
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| 162 | writeUnsignedInteger(parm, size);
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| 163 | return *this;
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[68796] | 164 | }
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| 165 |
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[69683] | 166 | /** Serializes a floating point value.
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| 167 | *
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| 168 | * Only 8-bytes double precision values are supported
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| 169 | * by this function.
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| 170 | */
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| 171 | EBMLWriter& EBMLWriter::serializeFloat(EbmlClassId classId, float value)
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[52791] | 172 | {
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[69683] | 173 | writeClassId(classId);
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| 174 | Assert(sizeof(uint32_t) == sizeof(float));
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| 175 | writeSize(sizeof(float));
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| 176 |
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| 177 | union
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[65256] | 178 | {
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[69683] | 179 | float f;
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| 180 | uint8_t u8[4];
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| 181 | } u;
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[65197] | 182 |
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[69683] | 183 | u.f = value;
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[52791] | 184 |
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[69683] | 185 | for (int i = 3; i >= 0; i--) /* Converts values to big endian. */
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| 186 | write(&u.u8[i], 1);
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[52791] | 187 |
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[69683] | 188 | return *this;
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[52791] | 189 | }
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| 190 |
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[69683] | 191 | /** Serializes binary data. */
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| 192 | EBMLWriter& EBMLWriter::serializeData(EbmlClassId classId, const void *pvData, size_t cbData)
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[52791] | 193 | {
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[69683] | 194 | writeClassId(classId);
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| 195 | writeSize(cbData);
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| 196 | write(pvData, cbData);
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| 197 | return *this;
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[65256] | 198 | }
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| 199 |
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[69683] | 200 | /** Writes raw data to file. */
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| 201 | int EBMLWriter::write(const void *data, size_t size)
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[65256] | 202 | {
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[69683] | 203 | return RTFileWrite(m_hFile, data, size, NULL);
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[65256] | 204 | }
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| 205 |
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[69683] | 206 | /** Writes an unsigned integer of variable of fixed size. */
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| 207 | void EBMLWriter::writeUnsignedInteger(uint64_t value, size_t size /* = sizeof(uint64_t) */)
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[65256] | 208 | {
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[69683] | 209 | /* convert to big-endian */
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| 210 | value = RT_H2BE_U64(value);
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| 211 | write(reinterpret_cast<uint8_t*>(&value) + sizeof(value) - size, size);
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[52791] | 212 | }
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| 213 |
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[69683] | 214 | /** Writes EBML class ID to file.
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| 215 | *
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| 216 | * EBML ID already has a UTF8-like represenation
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| 217 | * so getSizeOfUInt is used to determine
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| 218 | * the number of its bytes.
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| 219 | */
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| 220 | void EBMLWriter::writeClassId(EbmlClassId parm)
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[68332] | 221 | {
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[69683] | 222 | writeUnsignedInteger(parm, getSizeOfUInt(parm));
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[68332] | 223 | }
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| 224 |
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[69683] | 225 | /** Writes data size value. */
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| 226 | void EBMLWriter::writeSize(uint64_t parm)
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[52791] | 227 | {
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[69683] | 228 | /* The following expression defines the size of the value that will be serialized
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| 229 | * as an EBML UTF-8 like integer (with trailing bits represeting its size):
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| 230 | 1xxx xxxx - value 0 to 2^7-2
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| 231 | 01xx xxxx xxxx xxxx - value 0 to 2^14-2
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| 232 | 001x xxxx xxxx xxxx xxxx xxxx - value 0 to 2^21-2
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| 233 | 0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx - value 0 to 2^28-2
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| 234 | 0000 1xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx - value 0 to 2^35-2
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| 235 | 0000 01xx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx - value 0 to 2^42-2
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| 236 | 0000 001x xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx - value 0 to 2^49-2
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| 237 | 0000 0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx - value 0 to 2^56-2
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| 238 | */
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| 239 | size_t size = 8 - ! (parm & (UINT64_MAX << 49)) - ! (parm & (UINT64_MAX << 42)) -
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| 240 | ! (parm & (UINT64_MAX << 35)) - ! (parm & (UINT64_MAX << 28)) -
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| 241 | ! (parm & (UINT64_MAX << 21)) - ! (parm & (UINT64_MAX << 14)) -
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| 242 | ! (parm & (UINT64_MAX << 7));
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| 243 | /* One is subtracted in order to avoid loosing significant bit when size = 8. */
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| 244 | uint64_t mask = RT_BIT_64(size * 8 - 1);
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| 245 | writeUnsignedInteger((parm & (((mask << 1) - 1) >> size)) | (mask >> (size - 1)), size);
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[52791] | 246 | }
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| 247 |
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[69683] | 248 | /** Size calculation for variable size UNSIGNED integer.
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| 249 | *
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| 250 | * The function defines the size of the number by trimming
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| 251 | * consequent trailing zero bytes starting from the most significant.
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| 252 | * The following statement is always true:
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| 253 | * 1 <= getSizeOfUInt(arg) <= 8.
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| 254 | *
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| 255 | * Every !(arg & (UINT64_MAX << X)) expression gives one
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| 256 | * if an only if all the bits from X to 63 are set to zero.
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| 257 | */
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| 258 | size_t EBMLWriter::getSizeOfUInt(uint64_t arg)
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[52791] | 259 | {
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[69683] | 260 | return 8 - ! (arg & (UINT64_MAX << 56)) - ! (arg & (UINT64_MAX << 48)) -
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| 261 | ! (arg & (UINT64_MAX << 40)) - ! (arg & (UINT64_MAX << 32)) -
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| 262 | ! (arg & (UINT64_MAX << 24)) - ! (arg & (UINT64_MAX << 16)) -
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| 263 | ! (arg & (UINT64_MAX << 8));
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[52791] | 264 | }
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[63160] | 265 |
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