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Lines 26-32
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<p> |
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<p> |
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Any numbers or strings stored in the records are always stored in |
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Any numbers or strings stored in the records are always stored in |
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Little Endian format (least important bytes first). This is the case |
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Little Endian format (least important bytes first). This is the case |
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no matter what platform the file was written on - be that a |
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no matter what platform the file was written on - be that a |
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Little Endian or a Big Endian system. |
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Little Endian or a Big Endian system. |
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</p> |
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</p> |
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<p> |
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<p> |
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Lines 36-42
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records. |
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records. |
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</p> |
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</p> |
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</section> |
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</section> |
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<section><title>Record Headers</title> |
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<section><title>Record Headers</title> |
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<p> |
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<p> |
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All records, be they containers or atoms, have the same standard |
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All records, be they containers or atoms, have the same standard |
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Lines 88-94
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</p> |
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</p> |
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<p> |
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<p> |
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The UserEditAtom contains two byte level offsets (again as 32 bit |
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The UserEditAtom contains two byte level offsets (again as 32 bit |
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little endian numbers). At byte 12 is the offset to the |
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little endian numbers). At byte 12 is the offset to the |
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PersistPtrIncrementalBlock associated with this UserEditAtom |
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PersistPtrIncrementalBlock associated with this UserEditAtom |
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(each UserEditAtom has one and only one PersistPtrIncrementalBlock). |
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(each UserEditAtom has one and only one PersistPtrIncrementalBlock). |
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At byte 8, there's the offset to the previous UserEditAtom. If this |
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At byte 8, there's the offset to the previous UserEditAtom. If this |
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Lines 96-102
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| 96 |
</p> |
96 |
</p> |
| 97 |
<p> |
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<p> |
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Every time you do a non full save in PowerPoint, it tacks on another |
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Every time you do a non full save in PowerPoint, it tacks on another |
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UserEditAtom and another PersistPtrIncrementalBlock. The |
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UserEditAtom and another PersistPtrIncrementalBlock. The |
| 100 |
CurrentUserAtom is updated to point to this new UserEditAtom, and the |
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CurrentUserAtom is updated to point to this new UserEditAtom, and the |
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new UserEditAtom points back to the previous UserEditAtom. You then |
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new UserEditAtom points back to the previous UserEditAtom. You then |
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end up with a chain, starting from the CurrentUserAtom, linking |
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end up with a chain, starting from the CurrentUserAtom, linking |
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Lines 139-145
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The PersistPtrIncrementalBlock contains byte offsets to all the |
139 |
The PersistPtrIncrementalBlock contains byte offsets to all the |
| 140 |
Slides, Notes, Documents and MasterSlides in the file. The first |
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Slides, Notes, Documents and MasterSlides in the file. The first |
| 141 |
PersistPtrIncrementalBlock will point to all the ones that |
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PersistPtrIncrementalBlock will point to all the ones that |
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were present the first time the file was saved. Subsequent |
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were present the first time the file was saved. Subsequent |
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PersistPtrIncrementalBlocks will contain pointers to all the ones |
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PersistPtrIncrementalBlocks will contain pointers to all the ones |
| 144 |
that were changed in that edit. To find the offset to a given |
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that were changed in that edit. To find the offset to a given |
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sheet in the latest version, then start with the most recent |
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sheet in the latest version, then start with the most recent |
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Lines 155-161
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into memory, the lower 20 bits contain the starting number for the |
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into memory, the lower 20 bits contain the starting number for the |
| 156 |
sequence of sheets to be described. The higher 12 bits contain |
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sequence of sheets to be described. The higher 12 bits contain |
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the count of the number of sheets described. Following that is |
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the count of the number of sheets described. Following that is |
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one 32 bit little endian integer for each sheet in the sequence, |
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one 32 bit little endian integer for each sheet in the sequence, |
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the value being the offset to that sheet. If there is any data |
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the value being the offset to that sheet. If there is any data |
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left after parsing a block, then it corresponds to the next block. |
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left after parsing a block, then it corresponds to the next block. |
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</p> |
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</p> |
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Lines 178-183
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| 178 |
</source> |
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</source> |
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</section> |
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</section> |
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<section> |
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<title>Fonts in PowerPoint</title> |
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PowerPoint stores information about used fonts in FontEntityAtoms wich live inside Document.Environment.FontCollection. |
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For every font used, a FontEntityAtom must exist for that font. There is always at least one FontEntityAtom |
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in Document.Environment.FontCollection which describes the default font. |
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| 187 |
<title>FontEntityAtom</title> |
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<p>The instance field of the record header contains the zero based index of the font. |
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It is used to refer to the font in StyleTextPropAtoms. |
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The length of FontEntityAtom is always 68 bytes. |
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</p> |
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| 193 |
<p>Record Structure</p> |
| 194 |
<table> |
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<tr> |
| 196 |
<td>Offset</td> |
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<td>Type</td> |
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<td>Name</td> |
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<td>Contents</td> |
| 200 |
</tr> |
| 201 |
|
| 202 |
<tr> |
| 203 |
<td>0</td> |
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<td>String</td> |
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<td>font name</td> |
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<td> A null-terminated string that specifies the typeface name of the font in UTF-16LE encoding. |
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The length of this string must not exceed 32 characters, including the null terminator. |
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</td> |
| 209 |
</tr> |
| 210 |
|
| 211 |
<tr> |
| 212 |
<td>64</td> |
| 213 |
<td>byte</td> |
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<td>output precision</td> |
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<td> The bitmask which specifies the output precision. It defines how closely |
| 216 |
the output must match the requested font's height, width, character orientation, |
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escapement, pitch, and font type. For more information, consult the Windows API (LOGFONT) structure. |
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</td> |
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</tr> |
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| 221 |
<tr> |
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<td>65</td> |
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<td>byte</td> |
| 224 |
<td>clipping precision</td> |
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<td> The bitmask which specifies the clipping precision. The clipping precision defines how to |
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clip characters that are partially outside the clipping region. |
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For more information, consult the Windows API (LOGFONT) structure. |
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</td> |
| 229 |
</tr> |
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| 231 |
<tr> |
| 232 |
<td>66</td> |
| 233 |
<td>byte</td> |
| 234 |
<td>output quality</td> |
| 235 |
<td> The bitmask which specifies the output quality. The output quality defines how carefully |
| 236 |
the graphics device interface (GDI) must attempt to match the logical-font attributes to those of an actual physical font. |
| 237 |
For more information, consult the Windows API (LOGFONT) structure. |
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</td> |
| 239 |
</tr> |
| 240 |
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| 241 |
<tr> |
| 242 |
<td>67</td> |
| 243 |
<td>byte</td> |
| 244 |
<td>pitch and family</td> |
| 245 |
<td>The bitmask which specifies the pitch and family of the font. |
| 246 |
For more information, consult the Windows API (LOGFONT) structure. |
| 247 |
</td> |
| 248 |
</tr> |
| 249 |
</table> |
| 250 |
</section> |
| 251 |
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| 181 |
<section><title>Paragraph and Text Styling</title> |
252 |
<section><title>Paragraph and Text Styling</title> |
| 182 |
<p> |
253 |
<p> |
| 183 |
There are quite a number of records that affect the styling |
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There are quite a number of records that affect the styling |
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Lines 196-204
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| 196 |
</p> |
267 |
</p> |
| 197 |
<p> |
268 |
<p> |
| 198 |
Normally, powerpoint will have one text record (TextBytesAtom |
269 |
Normally, powerpoint will have one text record (TextBytesAtom |
| 199 |
or TextCharsAtom) for every paragraph, with a preceeding |
270 |
or TextCharsAtom) for every paragraph, with a preceeding |
| 200 |
TextHeaderAtom to describe what sort of paragraph it is. |
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TextHeaderAtom to describe what sort of paragraph it is. |
| 201 |
If any of the stylings differ from the master's, then a |
272 |
If any of the stylings differ from the master's, then a |
| 202 |
StyleTextPropAtom will follow the text record. This contains |
273 |
StyleTextPropAtom will follow the text record. This contains |
| 203 |
the paragraph style information, and the styling information |
274 |
the paragraph style information, and the styling information |
| 204 |
for each section of the text which has a different style. |
275 |
for each section of the text which has a different style. |
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Lines 206-212
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| 206 |
</p> |
277 |
</p> |
| 207 |
<p> |
278 |
<p> |
| 208 |
For every font used, a FontEntityAtom must exist for that font. |
279 |
For every font used, a FontEntityAtom must exist for that font. |
| 209 |
The FontEntityAtoms live inside a FontCollection record, and |
280 |
The FontEntityAtoms live inside a FontCollection record, and |
| 210 |
there's one of those inside Environment record inside the |
281 |
there's one of those inside Environment record inside the |
| 211 |
Document record. <em>(More on Fonts to be discovered)</em> |
282 |
Document record. <em>(More on Fonts to be discovered)</em> |
| 212 |
</p> |
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</p> |
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Lines 273-276
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| 273 |
</source> |
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</source> |
| 274 |
</section> |
345 |
</section> |
| 275 |
</body> |
346 |
</body> |
| 276 |
</document> |
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</document> |