239 lines
8.7 KiB
Python
239 lines
8.7 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
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from __future__ import unicode_literals, division, absolute_import, print_function
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from .compatibility_utils import unicode_str
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from .unipath import pathof
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import os
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import imghdr
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import struct
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# note: struct pack, unpack, unpack_from all require bytestring format
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# data all the way up to at least python 2.7.5, python 3 okay with bytestring
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USE_SVG_WRAPPER = True
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""" Set to True to use svg wrapper for default. """
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FORCE_DEFAULT_TITLE = False
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""" Set to True to force to use the default title. """
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COVER_PAGE_FINENAME = 'cover_page.xhtml'
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""" The name for the cover page. """
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DEFAULT_TITLE = 'Cover'
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""" The default title for the cover page. """
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MAX_WIDTH = 4096
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""" The max width for the svg cover page. """
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MAX_HEIGHT = 4096
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""" The max height for the svg cover page. """
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def get_image_type(imgname, imgdata=None):
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imgtype = unicode_str(imghdr.what(pathof(imgname), imgdata))
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# imghdr only checks for JFIF or Exif JPEG files. Apparently, there are some
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# with only the magic JPEG bytes out there...
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# ImageMagick handles those, so, do it too.
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if imgtype is None:
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if imgdata is None:
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with open(pathof(imgname), 'rb') as f:
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imgdata = f.read()
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if imgdata[0:2] == b'\xFF\xD8':
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# Get last non-null bytes
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last = len(imgdata)
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while (imgdata[last-1:last] == b'\x00'):
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last-=1
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# Be extra safe, check the trailing bytes, too.
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if imgdata[last-2:last] == b'\xFF\xD9':
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imgtype = "jpeg"
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return imgtype
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def get_image_size(imgname, imgdata=None):
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'''Determine the image type of imgname (or imgdata) and return its size.
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Originally,
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Determine the image type of fhandle and return its size.
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from draco'''
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if imgdata is None:
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fhandle = open(pathof(imgname), 'rb')
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head = fhandle.read(24)
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else:
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head = imgdata[0:24]
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if len(head) != 24:
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return
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imgtype = get_image_type(imgname, imgdata)
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if imgtype == 'png':
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check = struct.unpack(b'>i', head[4:8])[0]
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if check != 0x0d0a1a0a:
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return
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width, height = struct.unpack(b'>ii', head[16:24])
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elif imgtype == 'gif':
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width, height = struct.unpack(b'<HH', head[6:10])
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elif imgtype == 'jpeg' and imgdata is None:
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try:
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fhandle.seek(0) # Read 0xff next
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size = 2
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ftype = 0
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while not 0xc0 <= ftype <= 0xcf:
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fhandle.seek(size, 1)
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byte = fhandle.read(1)
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while ord(byte) == 0xff:
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byte = fhandle.read(1)
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ftype = ord(byte)
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size = struct.unpack(b'>H', fhandle.read(2))[0] - 2
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# We are at a SOFn block
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fhandle.seek(1, 1) # Skip `precision' byte.
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height, width = struct.unpack(b'>HH', fhandle.read(4))
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except Exception: # IGNORE:W0703
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return
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elif imgtype == 'jpeg' and imgdata is not None:
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try:
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pos = 0
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size = 2
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ftype = 0
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while not 0xc0 <= ftype <= 0xcf:
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pos += size
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byte = imgdata[pos:pos+1]
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pos += 1
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while ord(byte) == 0xff:
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byte = imgdata[pos:pos+1]
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pos += 1
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ftype = ord(byte)
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size = struct.unpack(b'>H', imgdata[pos:pos+2])[0] - 2
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pos += 2
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# We are at a SOFn block
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pos += 1 # Skip `precision' byte.
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height, width = struct.unpack(b'>HH', imgdata[pos:pos+4])
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pos += 4
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except Exception: # IGNORE:W0703
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return
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else:
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return
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return width, height
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# XXX experimental
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class CoverProcessor(object):
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"""Create a cover page.
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"""
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def __init__(self, files, metadata, rscnames, imgname=None, imgdata=None):
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self.files = files
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self.metadata = metadata
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self.rscnames = rscnames
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self.cover_page = COVER_PAGE_FINENAME
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self.use_svg = USE_SVG_WRAPPER # Use svg wrapper.
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self.lang = metadata.get('Language', ['en'])[0]
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# This should ensure that if the methods to find the cover image's
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# dimensions should fail for any reason, the SVG routine will not be used.
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[self.width, self.height] = (-1,-1)
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if FORCE_DEFAULT_TITLE:
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self.title = DEFAULT_TITLE
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else:
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self.title = metadata.get('Title', [DEFAULT_TITLE])[0]
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self.cover_image = None
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if imgname is not None:
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self.cover_image = imgname
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elif 'CoverOffset' in metadata:
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imageNumber = int(metadata['CoverOffset'][0])
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cover_image = self.rscnames[imageNumber]
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if cover_image is not None:
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self.cover_image = cover_image
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else:
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print('Warning: Cannot identify the cover image.')
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if self.use_svg:
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try:
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if imgdata is None:
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fname = os.path.join(files.imgdir, self.cover_image)
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[self.width, self.height] = get_image_size(fname)
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else:
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[self.width, self.height] = get_image_size(None, imgdata)
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except:
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self.use_svg = False
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width = self.width
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height = self.height
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if width < 0 or height < 0 or width > MAX_WIDTH or height > MAX_HEIGHT:
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self.use_svg = False
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return
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def getImageName(self):
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return self.cover_image
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def getXHTMLName(self):
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return self.cover_page
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def buildXHTML(self):
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print('Building a cover page.')
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files = self.files
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cover_image = self.cover_image
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title = self.title
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lang = self.lang
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image_dir = os.path.normpath(os.path.relpath(files.k8images, files.k8text))
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image_path = os.path.join(image_dir, cover_image).replace('\\', '/')
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if not self.use_svg:
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data = ''
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data += '<?xml version="1.0" encoding="utf-8"?><!DOCTYPE html>'
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data += '<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"'
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data += ' xml:lang="{:s}">\n'.format(lang)
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data += '<head>\n<title>{:s}</title>\n'.format(title)
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data += '<style type="text/css">\n'
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data += 'body {\n margin: 0;\n padding: 0;\n text-align: center;\n}\n'
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data += 'div {\n height: 100%;\n width: 100%;\n text-align: center;\n page-break-inside: avoid;\n}\n'
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data += 'img {\n display: inline-block;\n height: 100%;\n margin: 0 auto;\n}\n'
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data += '</style>\n</head>\n'
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data += '<body><div>\n'
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data += ' <img src="{:s}" alt=""/>\n'.format(image_path)
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data += '</div></body>\n</html>'
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else:
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width = self.width
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height = self.height
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viewBox = "0 0 {0:d} {1:d}".format(width, height)
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data = ''
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data += '<?xml version="1.0" encoding="utf-8"?><!DOCTYPE html>'
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data += '<html xmlns="http://www.w3.org/1999/xhtml"'
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data += ' xml:lang="{:s}">\n'.format(lang)
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data += '<head>\n <title>{:s}</title>\n'.format(title)
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data += '<style type="text/css">\n'
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data += 'svg {padding: 0pt; margin:0pt}\n'
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data += 'body { text-align: center; padding:0pt; margin: 0pt; }\n'
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data += '</style>\n</head>\n'
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data += '<body>\n <div>\n'
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data += ' <svg xmlns="http://www.w3.org/2000/svg" height="100%" preserveAspectRatio="xMidYMid meet"'
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data += ' version="1.1" viewBox="{0:s}" width="100%" xmlns:xlink="http://www.w3.org/1999/xlink">\n'.format(viewBox)
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data += ' <image height="{0}" width="{1}" xlink:href="{2}"/>\n'.format(height, width, image_path)
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data += ' </svg>\n'
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data += ' </div>\n</body>\n</html>'
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return data
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def writeXHTML(self):
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files = self.files
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cover_page = self.cover_page
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data = self.buildXHTML()
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outfile = os.path.join(files.k8text, cover_page)
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if os.path.exists(pathof(outfile)):
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print('Warning: {:s} already exists.'.format(cover_page))
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os.remove(pathof(outfile))
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with open(pathof(outfile), 'wb') as f:
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f.write(data.encode('utf-8'))
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return
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def guide_toxml(self):
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files = self.files
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text_dir = os.path.relpath(files.k8text, files.k8oebps)
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data = '<reference type="cover" title="Cover" href="{:s}/{:s}" />\n'.format(
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text_dir, self.cover_page)
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return data
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