93 lines
2.0 KiB
Python
93 lines
2.0 KiB
Python
#
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#
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#
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from libs.jpg_bin import JpgBin
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class JpgBinWrite:
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#
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def __init__(self, jpg_in, jpg_out):
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self.fhr = jpg_in
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self.fhw = jpg_out
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#
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# input is the Crypto Sig class
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#
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def writeJpgPicSealPub(self, crypto_sig, fp):
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self.__writeJpgHeader()
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self.__writeJpgPicSeal(crypto_sig, crypto_sig.getPubKeyDER())
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self.__writeJpgImg(fp)
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#
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# input is the Crypto Sig class
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#
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def writeJpgPicSealPvt(self, crypto_sig, fp):
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self.__writeJpgHeader()
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self.__writeJpgPicSeal(crypto_sig, crypto_sig.getPvtKeyDER())
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self.__writeJpgImg(fp)
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#
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def __writeJpgPicSeal(self, crypto_sig, keyder):
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# must include 2 bytes of length too
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size = 2
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size += len(crypto_sig.hash_data)
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size += len(keyder)
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# write app marker
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self.fhw.write(JpgBin.app15_marker)
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# write picseal marker
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self.fhw.write(JpgBin.picseal_marker)
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# write the size of picseal record
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self.fhw.write(size.to_bytes(2, byteorder='big'))
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# write hash of image
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self.fhw.write(crypto_sig.hash_data)
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# write the public key
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self.fhw.write(keyder)
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#
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def __writeJpgImg(self, fp):
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self.__writeJpgMetadata(fp.markers_meta)
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self.__writeJpgImgData(fp.markers_img)
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self.__writeJpgFooter()
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self.fhw.flush()
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self.fhw.close()
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#
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# array of the marker information
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#
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def __writeJpgMetadata(self, markers):
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for marker in markers:
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self.fhr.seek(marker.fpos)
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data = self.fhr.read(marker.len)
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self.fhw.write(data)
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self.fhw.flush()
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#
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# array of the marker information
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#
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def __writeJpgImgData(self, markers):
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for marker in markers:
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# most of the image data is sequential
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cpos = self.fhr.tell()
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if (marker.fpos != cpos):
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self.fhr.seek(marker.fpos)
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data = self.fhr.read(marker.len)
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self.fhw.write(data)
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self.fhw.flush()
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#
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def __writeJpgHeader(self):
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self.fhw.write(bytes(JpgBin.soi_marker))
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#
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def __writeJpgFooter(self):
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self.fhw.write(bytes(JpgBin.eof_marker))
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