99 lines
2.5 KiB
Python
99 lines
2.5 KiB
Python
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"""
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pdf2image custom buffer parsers
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"""
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from io import BytesIO
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from typing import List
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from PIL import Image
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def parse_buffer_to_ppm(data: bytes) -> List[Image.Image]:
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"""Parse PPM file bytes to Pillow Image
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:param data: pdftoppm/pdftocairo output bytes
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:type data: bytes
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:return: List of PPM images parsed from the output
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:rtype: List[Image.Image]
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"""
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images = []
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index = 0
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while index < len(data):
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code, size, rgb = tuple(data[index : index + 40].split(b"\n")[0:3])
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size_x, size_y = tuple(size.split(b" "))
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file_size = len(code) + len(size) + len(rgb) + 3 + int(size_x) * int(size_y) * 3
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images.append(Image.open(BytesIO(data[index : index + file_size])))
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index += file_size
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return images
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def parse_buffer_to_pgm(data: bytes) -> List[Image.Image]:
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"""Parse PGM file bytes to Pillow Image
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:param data: pdftoppm/pdftocairo output bytes
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:type data: bytes
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:return: List of PGM images parsed from the output
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:rtype: List[Image.Image]
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"""
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images = []
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index = 0
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while index < len(data):
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code, size, maxval = tuple(data[index : index + 40].split(b"\n")[0:3])
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size_x, size_y = tuple(size.split(b" "))
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file_size = len(code) + len(size) + len(maxval) + 3 + int(size_x) * int(size_y)
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images.append(Image.open(BytesIO(data[index : index + file_size])))
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index += file_size
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return images
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def parse_buffer_to_jpeg(data: bytes) -> List[Image.Image]:
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"""Parse JPEG file bytes to Pillow Image
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:param data: pdftoppm/pdftocairo output bytes
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:type data: bytes
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:return: List of JPEG images parsed from the output
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:rtype: List[Image.Image]
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"""
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return [
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Image.open(BytesIO(image_data + b"\xff\xd9"))
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for image_data in data.split(b"\xff\xd9")[
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:-1
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] # Last element is obviously empty
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]
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def parse_buffer_to_png(data: bytes) -> List[Image.Image]:
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"""Parse PNG file bytes to Pillow Image
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:param data: pdftoppm/pdftocairo output bytes
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:type data: bytes
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:return: List of PNG images parsed from the output
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:rtype: List[Image.Image]
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"""
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images = []
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c1 = 0
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c2 = 0
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data_len = len(data)
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while c1 < data_len:
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# IEND can appear in a PNG without being the actual end
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if data[c2 : c2 + 4] == b"IEND" and (
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c2 + 8 == data_len or data[c2 + 9 : c2 + 12] == b"PNG"
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):
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images.append(Image.open(BytesIO(data[c1 : c2 + 8])))
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c1 = c2 + 8
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c2 = c1
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c2 += 1
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return images
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