Microsoft PowerPoint 97-2007二进制文件格式详解

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"该文档是Microsoft PowerPoint 97-2007二进制文件格式规范，涵盖了从PowerPoint 97到2007版本的文件格式详细信息，主要适用于扩展名为.ppt的文件。这份规范适用于开发与PowerPoint兼容的应用程序、工具或插件的人员，旨在促进不同系统间的数据交换和理解PowerPoint文件结构。" 在Microsoft Office PowerPoint 97-2007二进制文件格式规范中，主要涉及以下几个关键知识点： 1. **文件结构**：PowerPoint的二进制文件格式是基于一系列的记录和数据结构，这些结构定义了幻灯片、备注、讲义、动画效果、音频和视频等元素的存储方式。每个.ppt文件由头部、主体和尾部三部分组成，其中头部包含文件的元信息，主体包含实际的数据，而尾部则可能包含一些附加信息。 2. **记录格式**：文件中的每一个记录都包含了记录头、记录长度和记录数据。记录头用于识别记录类型和长度，记录数据则包含具体的幻灯片或功能相关的数据。 3. **对象序列化**：PowerPoint文件中的图形、文本框、图像和其他对象都以序列化的方式存储，允许程序解析并重新构建这些元素。 4. **幻灯片和幻灯片集**：规范详细描述了如何组织和存储幻灯片，包括幻灯片索引、布局信息、幻灯片内容（如文本、图形和超链接）以及幻灯片过渡和动画设置。 5. **样式和模板**：文件格式还涉及到主题、模板和样式的应用，这些定义了幻灯片的外观和格式，包括字体、颜色、效果和背景。 6. **嵌入对象和链接**：规范涵盖如何处理嵌入在幻灯片中的其他文件（如图表、声音或影片），以及外部链接的文件引用。 7. **压缩和加密**：PowerPoint文件可能使用了特定的压缩算法来减小文件大小，并提供了加密机制来保护内容的安全性。 8. **宏支持**：对于包含VBA（Visual Basic for Applications）宏的演示文稿，规范会解释宏是如何嵌入和执行的。 9. **兼容性**：此规范特别重要，因为它确保了不同版本的PowerPoint之间以及与其他支持PowerPoint格式的应用程序之间的兼容性。 10. **开放规格承诺**：微软的开放规格承诺（Open Specification Promise, OSP）意味着任何人都可以不受限制地复制、展示和使用这份规范，但必须保持原始内容的完整性和对微软版权的承认。了解和掌握这份规范有助于开发者创建能够读取、写入或转换PowerPoint文件的软件，也可以帮助数据恢复专家理解和修复损坏的.ppt文件。此外，对于深入研究Office文件格式的学术研究和教学也有重要意义。

Microsoft Office PowerPoint 97-2007 Binary File Format (.ppt) Specification Page 15 of 118

100006 1048582 1 consecutive refs starting at 6

2000 8192 Offset to ref(6)

200008 2087160 2 consecutive refs starting at 8

2710 10000 Offset to ref(8)

4E20 20000 Offset to ref(9)

For an example of an application that tracks user edits see appendix B.

Microsoft Office PowerPoint 97-2007 Binary File Format (.ppt) Specification Page 16 of 118

PowerPoint Document Stream

The PowerPoint Document Stream keeps all the information about a PowerPoint

presentation. A PowerPoint file stores its data in records (see Appendix B). There are two

different kinds of records in a file: atoms and containers. We could, as with storages and

streams, compare atoms and containers to files and directories, respectively. Atoms, like

files, keep the actual information. Containers, just like directories, can contain files and other

directories.

 Atoms: Records that contain information about a PowerPoint object and are kept inside

containers.

 Containers: Records that keep atoms and other containers in a logical and organized

way.

A Slide

A typical PowerPoint file will have Slide containers. A Slide container keeps all the atoms

and containers necessary to describe a single PowerPoint slide.

Physical File Format

Each record, weather its an atom or a container, has a Record Header. The record header

is a structure defined as follows:

struct RecordHeader

{

psrVersion recVer : 4

psrInstance recInstance : 12;

psrType recType;

psrSize recLen;

};

Record Version: (recVer) Indicates the version if the record is an atom. All versions are

prefixed by VER and are enumerated in Appendix B. If the record is a container, this field

has a value of 0xFFFF.

Record Instance: (recInstance) Differentiates atoms. Depending on the instance a record‟s

contents it can have different meanings. For example a list container can store a list of slides

or a list of fonts, and it‟s instance would vary accordingly. Instances are prefixed by INS (see

Appendix B). The instance of a record is useful for differentiating atoms when there is more

than one atom of the same type in a particular container.

Record Type: (recType) Indicates the signature or type of the record. Each record has a

symbolic and a numeric signature (see Appendix B). All the symbolic signatures are prefixed

by PST. For example, the symbolic signature for a slide is PST_Slide which has a value of

1006. A description of each of the different types can be found in the Record Descriptions

section.

Record Length: (recLen) Stores the length of the record in bytes. If the record is an atom, it

refers to the length of the atom excluding the header. If the record is a container, it refers to

the sum of the lengths of the atoms inside it, plus the length of the record headers.

Microsoft Office PowerPoint 97-2007 Binary File Format (.ppt) Specification Page 17 of 118

Record Descriptions

This section describes each of the storage types listed in Appendix B. It contains the

symbolic and numeric signature for each record. It is organized alphabetically by symbolic

signatures, with the numeric signatures in parentheses next to it. For an index organized by

number, please refer to Appendix A.

As stated before there are two kinds of storage elements in a PowerPoint file: atoms and

containers. Atoms are described by indicating each of the fields‟ contents and their meaning.

An atom‟s description is done in this section using types and offsets; but it is done using C++

language syntax in Appendix B. Containers are described in this section by indicating their

use and the atoms and containers that they hold.

AnimationAtom12 (11019)

Added in PowerPoint 2007.

A variable length container which contains animation XML for a slide. The purpose of this

record is that when we open the file back in PowerPoint 2007 we can correctly restore the

PowerPoint 2007 animations for a slide.

The data is actually a package in Office Open XML format, which can be simply opened as a

zip file. The package‟s main part contains the XML for a <timing> element that conforms to

the schema defined by CT_SlideTiming. The package may also contain parts for embedded

sounds referenced within the CT_SlideTiming XML.

For more information about the xml data representing animations, refer to the Office Open

XML PresentationML documentation.

AnimationHashAtom12 (11021)

Added in PowerPoint 2007.

An unsigned integer that contains a CRC Hash value that is used to determine whether

animations or shapes for a slide have been modified in PowerPoint 2003 or below. The

values hashed are the bytes of the binary stream that represent the animation timing tree as

converted from the PowerPoint 2007 representation to the PowerPoint 2003 representation,

followed by the bytes that represent the PowerPoint 2003 shape IDs of the shapes on the

slide.

AnimationHash12 Fields

Offset

Type

Name

Contents

uint4

animationChecks

Checksum for the animation

AnimationInfo (4116)

A container for information about animation. It contains:

1. AnimationInfoAtom (4081)

2. Sound (2022), optional

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