Patch for KOReader to build logical page count

2-logical-page-count.lua

local ReaderPageMap = require("apps/reader/modules/readerpagemap")
local postInit_orig = ReaderPageMap._postInit

ReaderPageMap._postInit = function(self)
    self.ui.document:buildSyntheticPageMapIfNoneDocumentProvided(1818)

    -- Run original code
    postInit_orig(self)
end

My patch is simply calling buildSyntheticPageMapIfNoneDocumentProvided function. It checks if there's no existing page map and then marks a page every N symbols (in my case, 1818).

Here's a corresponding change in crengine: koreader/crengine#478. The author should look there.

Thank you Denis!

I was looking for something like this. My purpose is to see if one book is really longer than another. I use 1024 for no reason.

It's a pity that everyone has to invent their own counting methods.

How about a patch to use the ADE counting method? Why? I'm sure Pocketbook is using it and Calibre has a plugin to count pages using this. Somehow when I enter the 1024 to that plugin it doesn't return the number generated by current patch as shown in Koreader.

I looked into it but it’s impossible (read: too tricky) to use from KOReader. ADE is using 1K of the compressed bytes as a single page and KOReader operates on uncompressed data.

Here's the relevant comment in the issue: koreader/koreader#9020 (comment)

Thank you.

So there is no way to automatically fill the calibre database with the reference/logical page, I guess.

I think it should be possible to fill in the reference pages in bulk with Calibre. And then KOReader should use them.

Thank you @dmalinovsky! How did you calculate 1818? I used 2048 as a common value, but I'm curious about your reasoning

Thank you @dmalinovsky! How did you calculate 1818? I used 2048 as a common value, but I'm curious about your reasoning

It’s just Russian publishing specific number — 40,000 characters per 22 pages equals 1,818 characters.

How can I find a common value for Brazilian Portuguese publishing specific number? I'm using the default one in this patch. Thanks in advance!

How can I find a common value for Brazilian Portuguese publishing specific number? I'm using the default one in this patch. Thanks in advance!

I don’t think you’ll find an exact number. The one I’m using is good enough. Feel free to tweak it.

I think it should be possible to fill in the reference pages in bulk with Calibre. And then KOReader should use them.

I can fill the reference pages in bulk and download the books via opsd (I think the metadata is embedded in the process). But how can I tell KOReader to USE that value? Let's say I have it stored it a custom field in calibre named as "#k_pages"

And is it possible to apply the logical pages in other places? I have noticed the "Book Information" panel now doesn't use that value. "Alternative status bar" doesn't use it either.

I think it should be possible to fill in the reference pages in bulk with Calibre. And then KOReader should use them.

I can fill the reference pages in bulk and download the books via opsd (I think the metadata is embedded in the process). But how can I tell KOReader to USE that value? Let's say I have it stored it a custom field in calibre named as "#k_pages"

It doesn't work like that, but it's possible to pass reference pages from Calibrea to KOReader: koreader/koreader#13869. Note that there was a bug in Calibre recently breaking this.

And is it possible to apply the logical pages in other places? I have noticed the "Book Information" panel now doesn't use that value. "Alternative status bar" doesn't use it either.

This is up to the devs. Reading stats also don't support it: koreader/koreader#13345

Maybe I'll take a look some day but it's not a priority for me.

This gist will be superseded by koreader/koreader#14405.