fb2 to html5 loose images after conversion #5847
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Have you tried with |
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No, I didn't know about that parameter. With even Is there any way to convert and put base64 into For part I have some example from other languageThis is python language and it determine a lot types of media, however if you remove and leave only to, probably, Built-in libraries from code example: def get_image_metadata(file_path: str):
size = os.path.getsize(file_path)
with open(file_path, "rb") as input:
width, height = -1, -1
data = input.read(32)
if (size >= 10) and data[:6] in (b"GIF87a", b"GIF89a"):
# GIF
type, format = "img", GIF
w, h = struct.unpack("<HH", data[6:10])
width, height = int(w), int(h)
elif ((size >= 24) and data.startswith(b"\211PNG\r\n\032\n") and (data[12:16] == b"IHDR")):
# PNG
type, format = "img", PNG
w, h = struct.unpack(">LL", data[16:24])
width, height = int(w), int(h)
elif (size >= 16) and data.startswith(b"\211PNG\r\n\032\n"):
# older PNG
type, format = "img", PNG
w, h = struct.unpack(">LL", data[8:16])
width, height = int(w), int(h)
elif (size >= 2) and data.startswith(b"\377\330"):
# JPEG
type, format = "img", JPEG
input.seek(0)
input.read(2)
b = input.read(1)
try:
while (b and ord(b) != 0xDA):
while (ord(b) != 0xFF):
b = input.read(1)
while (ord(b) == 0xFF):
b = input.read(1)
if (ord(b) >= 0xC0 and ord(b) <= 0xC3):
input.read(3)
h, w = struct.unpack(">HH", input.read(4))
break
else:
input.read(int(struct.unpack(">H", input.read(2))[0]) - 2)
b = input.read(1)
width, height = int(w), int(h)
except struct.error as e:
return None # UnknownImageFormat("StructError" + msg)
except ValueError as e:
return None # UnknownImageFormat("ValueError" + msg)
except Exception as e:
return None # UnknownImageFormat(e.__class__.__name__)
elif (size >= 26) and data.startswith(b"BM"):
# BMP
type, format = "img", BMP
headersize = struct.unpack("<I", data[14:18])[0]
if headersize == 12:
w, h = struct.unpack("<HH", data[18:22])
width, height = int(w), int(h)
elif headersize >= 40:
w, h = struct.unpack("<ii", data[18:26])
width, height = int(w), abs(int(h)) # as h is negative when stored upside down
else:
return None # UnknownImageFormat("Unkown DIB header size:" + str(headersize))
elif (size >= 8) and data[:4] in (b"II\052\000", b"MM\000\052"):
# Standard TIFF, big- or little-endian
# BigTIFF and other different but TIFF-like formats are not
# supported currently
type, format = "img", TIFF
byteOrder = data[:2]
boChar = ">" if byteOrder == "MM" else "<"
# maps TIFF type id to size (in bytes)
# and python format char for struct
tiffTypes = {
1: (1, boChar + "B"), # BYTE
2: (1, boChar + "c"), # ASCII
3: (2, boChar + "H"), # SHORT
4: (4, boChar + "L"), # LONG
5: (8, boChar + "LL"), # RATIONAL
6: (1, boChar + "b"), # SBYTE
7: (1, boChar + "c"), # UNDEFINED
8: (2, boChar + "h"), # SSHORT
9: (4, boChar + "l"), # SLONG
10: (8, boChar + "ll"), # SRATIONAL
11: (4, boChar + "f"), # FLOAT
12: (8, boChar + "d") # DOUBLE
}
ifdOffset = struct.unpack(boChar + "L", data[4:8])[0]
try:
countSize = 2
input.seek(ifdOffset)
ec = input.read(countSize)
ifdEntryCount = struct.unpack(boChar + "H", ec)[0]
# 2 bytes: TagId + 2 bytes: type + 4 bytes: count of values + 4
# bytes: value offset
ifdEntrySize = 12
for i in range(ifdEntryCount):
entryOffset = ifdOffset + countSize + i * ifdEntrySize
input.seek(entryOffset)
tag = input.read(2)
tag = struct.unpack(boChar + "H", tag)[0]
if (tag == 256 or tag == 257):
# if type indicates that value fits into 4 bytes, value
# offset is not an offset but value itself
type = input.read(2)
type = struct.unpack(boChar + "H", type)[0]
if type not in tiffTypes:
return None # UnknownImageFormat("Unkown TIFF field type:" + str(type))
typeSize, typeChar = tiffTypes[type][0:2]
input.seek(entryOffset + 8)
value = input.read(typeSize)
value = int(struct.unpack(typeChar, value)[0])
if tag == 256:
width = value
else:
height = value
if width > -1 and height > -1:
break
except Exception as e:
return None
elif size >= 0 and data[4:8] == b"ftyp" and data[8:12] in [b"isom", b"mp42", b"mp41", b"qt "]:
# MP4
type, format = "video", MP4
elif size >= 0 and data[24:32] == b"matroska":
# MKV
type, format = "video", MKV
elif size >= 0 and data[26:30] == b"webm":
# WEBM
type, format = "video", WEBM
elif size >= 0 and data[0:4] == b"RIFF" and data[8:12] == b"WEBP":
# WEBP https://developers.google.com/speed/webp/docs/riff_container
type, format = "img", WEBP
# static
if data[12:16] == b"VP8X":
width = int.from_bytes(data[24:27], byteorder="little") + 1
height = int.from_bytes(data[27:30], byteorder="little") + 1
elif data[12:16] == b"ANMF":
width = int.from_bytes(data[18:21], byteorder="little") + 1
height = int.from_bytes(data[21:24], byteorder="little") + 1
else:
return None
elif size >= 2: #correct that
# see http://en.wikipedia.org/wiki/ICO_(file_format)
type, format = "img", ICO
input.seek(0)
reserved = input.read(2)
if 0 != struct.unpack("<H", reserved)[0]:
return None
format = input.read(2)
if 1 != struct.unpack("<H", format)[0]:
return None
num = input.read(2)
num = struct.unpack("<H", num)[0]
if num > 1:
import warnings
warnings.warn("ICO File contains more than one image")
# http://msdn.microsoft.com/en-us/library/ms997538.aspx
w, h = input.read(1), input.read(1)
width, height = ord(w), ord(h)
else:
return None
return {"path": file_path, "type": type, "format": format, "file_size": size, "width": width, "height": height} |
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Also, this option can be useful, to built-in images into the result: |
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pandoc 2.7.3
Compiled with pandoc-types 1.17.5.4, texmath 0.11.2.2, skylighting 0.8.1
I have fb2 with images, however I need to create html5 file to be able to read it later, but the problem, what image data are lost after conversion.
Code example:
between binary tags there a lot of data, image itself, and there several images used there.
Tags are converted into this:
But image info are not copied.
What you can do here is paste base64 images straight into src tag, example 1x1px transparent png:
The text was updated successfully, but these errors were encountered: