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Old 11-03-2012, 04:48 AM   #61
pdurrant
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Quote:
Originally Posted by jayz View Post
"not for books uploaded to KDP"
Why? Can you explain.
When you upload a book to KDP for Amazon to sell, they strip the file into parts anyway. The source never gets to customers.

It probably won't do any harm to upload a stripped book, but it won't do any good, either. Best to be cautious and send them the unaltered output from KindleGen if at all possible.

Last edited by pdurrant; 12-27-2012 at 04:58 PM. Reason: typo
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Old 11-03-2012, 05:54 PM   #62
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So would it be best if you had a situation like steppe?
Sideloading a very big image book?
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Old 11-03-2012, 06:04 PM   #63
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Quote:
Originally Posted by jayz View Post
So would it be best if you had a situation like steppe?
Sideloading a very big image book?
If it's for you own use, by all means strip the source. Steppe was uploading a very large book to Amazon's KDP service, it was above their maximum allowed upload file size before having the source stripped.
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Old 11-24-2012, 11:20 PM   #64
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I made a few modifications to get it to work with Python 3 - it still works in Python 2.7 (and likely 2.6 as well, but I haven't tested that).

Ran it through 2to3, which switched the print statements to a function by adding parentheses, and switched xrange to range. Then marked five strings ('NONE', 'EXTH', 'BOOKMOBI', 'SRCS', and '\0') with a "b" to mark them as byte strings rather than Unicode.
Attached Files
File Type: zip kindlestrip_py3_v135.zip (3.5 KB, 168 views)
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Old 11-25-2012, 06:33 AM   #65
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Certainly Python 3.x is the way to go eventually, but I'm not willing to switch yet, as the default Python installation on Mac OS X 10.6 is Python 2.5, which doesn't know about the b for byte strings.

But perhaps I should think about it a bit more. Thanks.
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Old 12-10-2012, 08:11 PM   #66
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I had some trouble with the latest Version of KindleStrip (from THIS post) under ActivePython v3.2.2.3 (Win64-x64).

Error Message on first try:
Code:
File "D:\Work\XAMPP\htdocs\test\kindlestrip_py3.py", line 224, in <module>
    data_file = file(infile, 'rb').read()
NameError: name 'file' is not defined
Error Message on second try after replacing all calls to file() with open():
Code:
Traceback (most recent call last):
  File "D:\Work\XAMPP\htdocs\test\kindlestrip_py3.py", line 228, in <module>
    print("Header Bytes: " + binascii.b2a_hex(strippedFile.getHeader()))
TypeError: Can't convert 'bytes' object to str implicitly
Bugfixed portion of Code:
Spoiler:

Code:
if __name__ == "__main__":
    sys.stdout=Unbuffered(sys.stdout)
    print(('KindleStrip v%(__version__)s. '
       'Written 2010-2012 by Paul Durrant and Kevin Hendricks.' % globals()))
    if len(sys.argv)<3 or len(sys.argv)>4:
        print("Strips the Sources record from Mobipocket ebooks")
        print("For ebooks generated using KindleGen 1.1 and later that add the source")
        print("Usage:")
        print("    %s <infile> <outfile> <strippeddatafile>" % sys.argv[0])
        print("<strippeddatafile> is optional.")
        sys.exit(1)
    else:
        infile = sys.argv[1]
        outfile = sys.argv[2]
        data_file = open(infile, 'rb').read()
        try:
            strippedFile = SectionStripper(data_file)
            open(outfile, 'wb').write(strippedFile.getResult())
            print("Header Bytes: %s" % binascii.b2a_hex(strippedFile.getHeader()))
            if len(sys.argv)==4:
                open(sys.argv[3], 'wb').write(strippedFile.getStrippedData())
        except StripException as e:
            print("Error: %s" % e)
            sys.exit(1)
    sys.exit(0)


For a project of mine i created this PHP port of KindleStrip:
Spoiler:

The Class Mobi:
Code:
<?php
# This PHP Class is a PHP port of KindleStrip from Paul Durrant.
# Please refer to <http://www.mobileread.com/forums/showthread.php?t=96903>
# for more information on the original Python version of KindleStrip.
#
# This script strips the penultimate record from a Mobipocket file.
# This is useful because the current KindleGen add a compressed copy
# of the source files used in this record, making the ebook produced
# about twice as big as it needs to be.
#
#
# This is free and unencumbered software released into the public domain.
# 
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
# 
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
# 
# For more information, please refer to <http://unlicense.org/>
#
# Written by Patrick Klös, 2012, pkloes@web.de, padde on mobileread.com
#
# Changelog
#  1.00 - Initial version


class Mobi {
    const MOBI_FORMAT_IDENTIFIER                = "BOOKMOBI";
    const MOBI_SRCS_RECORD_IDENTIFIER           = "SRCS";
    const MOBI_EXTH_RECORD_IDENTIFIER           = "EXTH";
    const MOBI_EXTH_RECORD_CHECKBIT             = 0x40;
    const MOBI_EXTH_BOUNDARY_SECTION_IDENTIFIER = 0x79;
    
    private $data = null;
    private $output = null;
    
    public function __construct($file = null) {
        if($file != null) {
            $this->load($file);
        }
    }
    
    public function load($file) {
        if(is_readable($file)) {
            $this->data = file_get_contents($file);
        }
        
        return $this->isValid();
    }
    
    public function isValid() {
        $valid = false;
        
        if($this->data != null) {
            $valid = ($this->unpack_from("a8", $this->data, 0x3C) == Mobi::MOBI_FORMAT_IDENTIFIER);
        }
        
        $this->data = ($valid) ? $this->data : null;
        
        return $valid;
    }
    
    public function getOriginalData() {
        if($this->data != null) {
            return $this->data;
        }
        
        return false;
    }
    
    public function getStrippedData() {
        if($this->output != null) {
            return $this->output;
        }
        
        return false;
    }
    
    public function stripSRCS() {
        $num_sections = $this->unpack_from("n", $this->data, 76);
        
        $offset0 = $this->unpack_from("N", $this->data, 78);
        $offset1 = $this->unpack_from("N", $this->data, 86);
        
        $mobiheader = substr($this->data, $offset0, $offset1 - $offset0);
        
        list($srcs_secnum, $srcs_cnt) = $this->unpack_from("N2", $mobiheader, 0xe0);

        if($srcs_secnum == 0xffffffff || $srcs_cnt == 0) {
            return $this->data;
        }

        $next = $srcs_secnum + $srcs_cnt;
        
        list($srcs_offset, $flgval) = $this->unpack_from("N2", $this->data, 78 + ($srcs_secnum * 8));
        list($next_offset, $flgval) = $this->unpack_from("N2", $this->data, 78 + ($next * 8));
        
        $srcs_length = $next_offset - $srcs_offset;

        if($this->unpack_from("a4", $this->data, $srcs_offset) != Mobi::MOBI_SRCS_RECORD_IDENTIFIER) {
            return $this->data;
        }

        $this->output  = substr($this->data, 0, 68) . pack("N", (($num_sections - $srcs_cnt) * 2 + 1));
        $this->output .= substr($this->data, 72, 4);
        $this->output .= pack("n", $num_sections - $srcs_cnt); 

        $delta = $srcs_cnt * -8;

        foreach(range(0, $srcs_secnum - 1) as $i) {
            list($offset, $flgval) = $this->unpack_from("N2", $this->data, ($i * 8) + 78);
            $offset += $delta;
        
            $this->output .= pack("N", $offset) . pack("N", $flgval);
        }

        $delta = $delta - $srcs_length;

        foreach(range($srcs_secnum + $srcs_cnt, $num_sections - 1) as $i) {
            list($offset, $flgval) = $this->unpack_from("N2", $this->data, ($i * 8) + 78);
            $offset += $delta;
            $flgval = ($i - $srcs_cnt) * 2;
            
            $this->output .= pack("N", $offset) . pack("N", $flgval);
        }
        
        list($first_offset, $flgval) = $this->unpack_from("N2", $this->output, 78);

        $this->output .= str_repeat("\0", $first_offset - strlen($this->output));
        $this->output .= substr($this->data, $offset0, $srcs_offset - $offset0);
        $this->output .= substr($this->data, $srcs_offset + $srcs_length);

        $num_section -= $srcs_cnt;

        list($offset0, $flgval0) = $this->unpack_from("N2", $this->output, 78);
        list($offset1, $flgval1) = $this->unpack_from("N2", $this->output, 86);

        $mobiheader = substr($this->output, $offset0, $offset1 - $offset0);
        $mobiheader = substr($mobiheader, 0, 0xe0) . pack("N", 0xffffffff) . pack("N", 0) . substr($mobiheader, 0xe8);
        $mobiheader = $this->fixExthRecord($srcs_secnum, $srcs_cnt, $mobiheader);

        $this->output = substr($this->output, 0, $offset0) . $mobiheader . substr($this->output, $offset1);

        return $this->output;
    }
    
    private function fixExthRecord($srcs_secnum, $srcs_cnt, $mobiheader) {
        $mobi_length = $this->unpack_from("N", $mobiheader, 0x14);
        $exth_flag   = $this->unpack_from("N", $mobiheader, 0x80);
        
        if($exth_flag & Mobi::MOBI_EXTH_RECORD_CHECKBIT) {
            $exth = substr($mobiheader, $mobi_length + 16);
        
            if(strlen($exth) >= 4 && substr($exth, 0, 4) == Mobi::MOBI_EXTH_RECORD_IDENTIFIER) {
                $nitems = $this->unpack_from("N", $exth, 8);
                $pos = 12;
            
                foreach(range(0, $nitems - 1) as $i) {
                    list($type, $size) = $this->unpack_from("N2", $exth, $pos);

                    if($type == Mobi::MOBI_EXTH_BOUNDARY_SECTION_IDENTIFIER) {
                        $boundaryptr = $this->unpack_from("N", substr($exth, $pos + 8, $pos + $size), 0);
                    
                        if($srcs_secnum <= $boundaryptr) {
                            $boundaryptr -= $srcs_cnt;
                            
                            $prefix = substr($mobiheader, 0, $mobi_length + $pos + 0x18);
                            $suffix = substr($mobiheader, $mobi_length + $pos + 0x1C);
                            $nval   = pack("N", $boundaryptr);
                            
                            $mobiheader = $prefix . $nval . $suffix;
                        }
                    }
                
                    $pos += $size;
                }
            }
        }

        return $mobiheader;
    }    
    
    private function unpack_from($format, $src, $offset) {
        $result = array_merge(unpack("@" . strval($offset) . "/" . $format, $src));
        
        foreach($result as $key => $val) {
            $result[$key] = ($val < 0 && is_int($val)) ? $val += 4294967296 : $val;
        }
        
        return (count($result) == 1) ? array_shift($result) : $result;
    }
}
?>
Sample usage:
Code:
<?php
require_once("Mobi.php");

$mobi = new Mobi("test.mobi");

file_put_contents("strip.mobi", $mobi->stripSRCS());
?>


### EDIT ###
I decided to switch to Java for my Project.. so here is a implementation in Java
Spoiler:

Code:
package de.pkloes.ComicConv.mobi.Exceptions;

public class InvalidMobiFileException extends Exception {
    public InvalidMobiFileException() {}

    public InvalidMobiFileException(String message) {
        super(message);
    }
}
Code:
package de.pkloes.ComicConv.mobi;

import de.pkloes.ComicConv.mobi.Exceptions.InvalidMobiFileException;

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class Tools {
    final private static long MOBI_FORMAT_IDENTIFIER = 0x424f4f4b4d4f4249L;
    final private static int MOBI_SRCS_RECORD_IDENTIFIER = 0x53524353;
    final private static int MOBI_EXTH_RECORD_IDENTIFIER = 0x45585448;
    final private static int MOBI_EXTH_BOUNDARY_SECTION_IDENTIFIER = 0x79;

    public static void stripSRCS(File mobi, File stripped) throws IOException, InvalidMobiFileException {
        FileChannel fich = null;
        FileChannel foch = null;

        try {
            FileInputStream fin = new FileInputStream(mobi);
            fich = fin.getChannel();
            RandomAccessFile fout = new RandomAccessFile(stripped, "rw");
            foch = fout.getChannel();
            fout.setLength(0);

            ByteBuffer bul = ByteBuffer.allocateDirect(8);
            ByteBuffer bui = ByteBuffer.allocateDirect(4);

            fich.read(bul, 0x3c);

            if((getUInt(bul, 0) << 32 | getUInt(bul, 4)) != MOBI_FORMAT_IDENTIFIER) {
                throw new InvalidMobiFileException("Unsupported Mobi Format");
            }

            bul.clear();
            fich.read(bul, 76);
            int record_count = bul.getChar(0);
            long header_offset = getUInt(bul, 2);
            bul.clear();

            ByteBuffer data = ByteBuffer.allocateDirect((int) (header_offset + 0xe8));
            fich.read(data, 0);

            long srcs_record_number = getUInt(data, (int) (header_offset + 0xe0));
            long srcs_record_count  = getUInt(data, (int)(header_offset + 0xe4));

            if(srcs_record_number == 0xffffffffL || srcs_record_count == 0) {
                foch.transferFrom(fich, 0, fich.size());
                return;
            }

            long strip_start_offset = getUInt(data, (int)((srcs_record_number * 8) + 78));
            long strip_end_offset = getUInt(data, (int)(((srcs_record_number + srcs_record_count) * 8) + 78));
            long strip_length = strip_end_offset - strip_start_offset;

            fich.read(bul, strip_start_offset);
            if(getUInt(bul, 0) != MOBI_SRCS_RECORD_IDENTIFIER) {
                throw new InvalidMobiFileException("Broken SRCS Record");
            }
            bul.clear();

            int new_record_count = (int)(record_count - srcs_record_count);

            fich.transferTo(0, ((new_record_count) * 8) + 78, foch);
            putUnsignedInt(bui, 0, ((new_record_count) * 2) + 1);
            foch.write(bui, 68);
            bui.rewind();
            bui.putChar(0, (char) new_record_count);
            foch.write(bui, 76);

            long delta = srcs_record_count * -8;

            for(int x = 0; x <= srcs_record_number; x++) {
                bul.clear();
                putUnsignedInt(bul, 0, getUInt(data, (x * 8) + 78) + delta);
                putUnsignedInt(bul, 4, getUInt(data, (x * 8) + 82));
                foch.write(bul, (x * 8) + 78);
            }

            delta = delta - strip_length;

            for(int x = (int) (srcs_record_number + srcs_record_count); x < record_count; x++) {
                bul.clear();
                putUnsignedInt(bul, 0, getUInt(data, (x * 8) + 78) + delta);
                putUnsignedInt(bul, 4, (x - srcs_record_count) * 2);
                foch.write(bul, ((x - srcs_record_count) * 8) + 78);
            }

            bui.clear();
            foch.read(bui, 78);

            long first_record_offset = getUInt(bui, 0);

            foch.write(ByteBuffer.allocateDirect((int)(first_record_offset - foch.size())));
            fich.transferTo(header_offset, strip_start_offset - header_offset, foch);
            fich.transferTo(strip_start_offset + strip_length, fich.size(), foch);

            bul.clear();
            putUnsignedInt(bul, 0, 0xffffffffL);
            putUnsignedInt(bul, 4, 0);
            foch.write(bul, first_record_offset + 0xe0);

            bui.clear();
            foch.read(bui, first_record_offset + 0x14);

            long mobi_header_length = getUInt(bui, 0);

            bui.clear();
            foch.read(bui, first_record_offset + 0x80);

            long exth_flag = getUInt(bui, 0);
            long exth_start_offset = first_record_offset + mobi_header_length + 16;

            if((exth_flag & 0x40) == 0x40) {
                bui.clear();
                foch.read(bui, exth_start_offset);

                if(getUInt(bui, 0) == MOBI_EXTH_RECORD_IDENTIFIER) {
                    bui.clear();
                    foch.read(bui, exth_start_offset + 8);

                    long item_count = getUInt(bui, 0);
                    int pos = 12;

                    for(int x = 0; x < item_count; x++) {
                        bul.clear();
                        foch.read(bul, exth_start_offset + pos);

                        long item_type = getUInt(bul, 0);
                        long item_size = getUInt(bul, 4);

                        if(item_type == MOBI_EXTH_BOUNDARY_SECTION_IDENTIFIER) {
                            bui.clear();
                            foch.read(bui, exth_start_offset + pos + 8);

                            long boundary_pointer = getUInt(bui, 0);

                            if(srcs_record_number <= boundary_pointer) {
                                bui.clear();
                                putUnsignedInt(bui, 0, boundary_pointer - srcs_record_count);
                                foch.write(bui, first_record_offset + mobi_header_length + pos + 0x18);
                            }
                        }

                        pos += item_size;
                    }
                }
            }
        }
        finally {
            if(fich != null) fich.close();
            if(foch != null) foch.close();
        }
    }

    private static void putUnsignedInt(ByteBuffer bb, int position, long value) {
        bb.putInt(position, (int) (value & 0xffffffffL));
    }

    private static long getUInt(ByteBuffer b, int idx) {
        return ((long) b.getInt(idx) & 0xffffffffL);
    }
}


Big to pdurrant (and contributors!) for KindleStrip

Last edited by Padde; 12-21-2012 at 12:52 AM.
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Old 12-10-2012, 10:08 PM   #67
pholy
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As pdurrent points out in the post above yours, KindleStrip uses Python 2.x still, so you will have to install an older version of ActivePython. You should be able to have both installed in separate directories. Python 3 is the way of the future, but it is significantly different from, and incompatible with, Python 2.x.
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Old 12-11-2012, 04:01 AM   #68
Padde
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Well my point was that it works with Python 3 after applying the changes in the "Bugfixed portion of Code" Spoiler
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Old 01-27-2013, 01:08 PM   #69
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Today i tried to make a mobi file with kindlegen but when i used your program, this error appeared
Code:
D:\Sync\kcc-master\kcc>python.exe kindlestrip.py D:\Sync\Tools\kcc-master\kcc\content.mobi D:\crossgame1.mobi
KindleStrip v1.35. Written 2010-2012 by Paul Durrant and Kevin Hendricks.
Found SRCS section number 1536, and count 2
   beginning at offset 111a4084 and ending at offset 10fb9863
Traceback (most recent call last):
  File "kindlestrip.py", line 235, in <module>
    main(sys.argv[1:])
  File "kindlestrip.py", line 214, in main
    strippedFile = SectionStripper(data_file)
  File "kindlestrip.py", line 197, in __init__
    self.data_file = self.data_file[0:offset0] + mobiheader + self.data_file[off
set1:]
MemoryError
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Old 01-27-2013, 04:33 PM   #70
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Location: Norfolk, England
Device: NOOK ST GlowLight
Quote:
Originally Posted by laudaisoi View Post
Today i tried to make a mobi file with kindlegen but when i used your program, this error appeared
Code:
D:\Sync\kcc-master\kcc>python.exe kindlestrip.py D:\Sync\Tools\kcc-master\kcc\content.mobi D:\crossgame1.mobi
KindleStrip v1.35. Written 2010-2012 by Paul Durrant and Kevin Hendricks.
Found SRCS section number 1536, and count 2
   beginning at offset 111a4084 and ending at offset 10fb9863
Traceback (most recent call last):
  File "kindlestrip.py", line 235, in <module>
    main(sys.argv[1:])
  File "kindlestrip.py", line 214, in main
    strippedFile = SectionStripper(data_file)
  File "kindlestrip.py", line 197, in __init__
    self.data_file = self.data_file[0:offset0] + mobiheader + self.data_file[off
set1:]
MemoryError
How big was the file, and how much memory does your computer have? The script wasn't written for memory efficiency, and it seems that it might have exceeded available memory on your machine.
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Old 01-31-2013, 03:12 AM   #71
laudaisoi
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Originally Posted by pdurrant View Post
How big was the file, and how much memory does your computer have? The script wasn't written for memory efficiency, and it seems that it might have exceeded available memory on your machine.
My mobi. file has a lot of images and lager than 500Mb. My computer run windows7 64bit with 4Gb RAM.
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Old 01-31-2013, 03:17 AM   #72
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Quote:
Originally Posted by laudaisoi View Post
My mobi. file has a lot of images and lager than 500Mb. My computer run windows7 64bit with 4Gb RAM.
500MB file? 4GB RAM? Then that's the problem. It would need to use memory more efficiently to cope with that kind of file with that amount of installed memory, and that might not be simple.
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Old 01-31-2013, 04:45 PM   #73
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I took my java version of Kindlestrip and take it for a spin.
It handled a 450mb ish comic that i had at my hands just fine
so i guess its worth a try. For convenience i build a executable JAR.

Usage:
Code:
java -jar KindleStripJava.jar input.mobi output.mobi
Attached Files
File Type: jar KindleStripJava.jar (7.6 KB, 246 views)

Last edited by Padde; 01-31-2013 at 04:53 PM. Reason: Added JAR Version with sources
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Old 02-23-2013, 12:23 AM   #74
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AN UPDATE: The output file of KindleStrip 1.35 works OK in the new version of Kindle Previewer: v2.8. This is true of .mobi files generated by KindleGen 1.2 and 2.8. Thank you, PDurrant and KevinH, for creating and maintaining this software.
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Old 03-22-2013, 02:23 PM   #75
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This will be especially useful now that the Personal Documents service preserves kf8 formatting. AFAICT, it does not strip the source before storing (file size is only modestly reduced), and there is a 50MB maximum file size enforced by Send to Kindle (and that limit is higher than can generally be sent as an email attachment). In some cases, it might be helpful to upload separate kf8 and mobi files to get under this minimum (mobi still required for iOS). Is there a way to do this?
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