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Difference between revisions of "ZIM file format"
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Real zimlib -> libzim fix
(Zimlib -> libzim) |
m (Real zimlib -> libzim fix) |
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Libzim caches directory entries and references the cached entries via the URL pointers. | |||
== Title Pointer List (titlePtrPos) == | == Title Pointer List (titlePtrPos) == | ||
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The indirection from titles via URLs to directory entries has two reasons: | The indirection from titles via URLs to directory entries has two reasons: | ||
* the pointer list is only half in size as 4 bytes are enough for each entry | * the pointer list is only half in size as 4 bytes are enough for each entry | ||
* accessing directory entries by title also makes use of cached directory entries which are referenced by the URL pointers, as implemented in . | * accessing directory entries by title also makes use of cached directory entries which are referenced by the URL pointers, as implemented in libzim. | ||
== Directory Entries == | == Directory Entries == | ||
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A cluster can be extended only if the zim major version is 6. Else (major version == 5) cluster will always be not extended. | A cluster can be extended only if the zim major version is 6. Else (major version == 5) cluster will always be not extended. | ||
The | The libzim uses [http://tukaani.org/xz/ xz-utils] as a C++ implementation of lzma2, for Java see [http://tukaani.org/xz/java.html XZ-Java]. | ||
To find the data of a specific directory entry within a cluster the uncompressed cluster has a list of pointers to blobs within the uncompressed cluster after the first byte. | To find the data of a specific directory entry within a cluster the uncompressed cluster has a list of pointers to blobs within the uncompressed cluster after the first byte. | ||
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If you use a common rendering engine or HTML widget you don't have to care for this cases, you can just use the requests as they are submitted by the engine / widget. | If you use a common rendering engine or HTML widget you don't have to care for this cases, you can just use the requests as they are submitted by the engine / widget. | ||
Should you render the article contents by yourself you have to consider this and take care of it before you hand requests to . | Should you render the article contents by yourself you have to consider this and take care of it before you hand requests to libzim. | ||
== Encodings == | == Encodings == | ||