初步完成png图片识别
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d1e0061c14
commit
6ebd0c35ef
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import binascii
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import json
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import os
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import random
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import re
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import sys
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import time
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from PIL import Image
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class PNG:
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def __init__(self):
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pass
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# 检测文件格式，返回百分比
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@staticmethod
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def test(data: bytearray):
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return 100
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# 获取图片信息
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@staticmethod
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def get_info(data: bytearray):
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text = b'tEXt'
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index = data.find(text)
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if index > 32:
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length = int.from_bytes(data[index-4: index], byteorder='big')
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chunk_data = data[index+4: index+4+length]
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print('[*] 图像信息：')
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print(bytes(chunk_data).split(b'\x00'))
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info = chunk_data
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return info
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def check_tail(data: bytearray):
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changed = False
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tail = None
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iend = b'\x49\x45\x4E\x44\xAE\x42\x60\x82'
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length = len(data)
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index = data.find(iend)
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if index == -1:
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index = data.find(iend[0:4])
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if index != -1:
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index = index + 4
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else:
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index = index + 8
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if index == -1:
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print('[x] 缺少png文件格式结束标识符IEND')
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elif index < 32:
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print('[x] 缺少png文件格式结束标识符IEND位置貌似不太对')
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else:
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tail = data[index:]
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if len(tail) > 0:
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changed = True
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print('[x] 检测到文件尾部有垃圾数据，已尝试修复')
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return changed, data, tail
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# 修复文件头
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@staticmethod
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def repair_sig(data: bytearray):
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changed = False
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head = None
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print('[*] 检测文件头')
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sig = b'\x89\x50\x4E\x47\x0D\x0A\x1A\x0A'
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index = data.find(sig)
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if index > 0:
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print('[x] 检测到文件头前有垃圾数据，已尝试修复')
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head = bytes(data[:index])
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data = data[index:]
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changed = True
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elif data[0:8] != sig:
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print('[x] 检测到文件头异常，已尝试修复')
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data[0:8] = sig
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changed = True
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return changed, data, head
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# 修复尺寸
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@staticmethod
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def repair_size(data: bytearray):
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changed = False
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print('[*] 检测文件尺寸')
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chunk_begin = 8
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data_begin = chunk_begin + 8
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width_begin = data_begin
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height_begin = data_begin + 4
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length = int.from_bytes(data[chunk_begin:chunk_begin+4], byteorder='big')
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ctype = data[chunk_begin+4: chunk_begin+8] # 应该为 b'\x49\x48\x44\x52'，即 b'IHDR'
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chunk_data = data[data_begin: data_begin+length]
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width = int.from_bytes(chunk_data[0:4], byteorder='big')
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height = int.from_bytes(chunk_data[4:8], byteorder='big')
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crc = int.from_bytes(data[data_begin+length:data_begin+length+4], byteorder='big')
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if PNG.test_ihdr_chunk(ctype + chunk_data, crc):
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print(' - 图片尺寸设置正确')
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else:
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b = False
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if not b:
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print('[x] 尝试修复图片宽度...')
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chunk = ctype + chunk_data
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for i in range(1, 2048):
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chunk[4:8] = i.to_bytes(4, byteorder='big')
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if PNG.test_ihdr_chunk(bytes(chunk), crc):
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width = i
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print(f'[*] 图片宽度修复成功，宽度值为{i}')
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data[width_begin: width_begin+4] = width.to_bytes(4, byteorder='big')
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changed = True
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b = True
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break
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if not b:
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print('[x] 尝试修复图片高度...')
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chunk = ctype + chunk_data
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for i in range(1, 2048):
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chunk[8:12] = i.to_bytes(4, byteorder='big')
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if PNG.test_ihdr_chunk(chunk, crc):
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height = i
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print(f'[*] 图片高度修复成功，宽度值为{i}')
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data[height_begin: height_begin+4] = width.to_bytes(4, byteorder='big')
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changed = True
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b = True
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break
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if not b:
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temp = input(f'当前宽度值为{width}，高度值为{height}，是否尝试将高度值设置为更高？可输入高度值或直接回车：')
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if temp.isdigit():
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height = int(temp)
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data[height_begin: height_begin+4] = height.to_bytes(4, byteorder='big')
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print(f'[*] 已将图片高度设置为{height}')
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changed = True
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return changed, data, width, height
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@staticmethod
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def test_ihdr_chunk(chunk_data, crc):
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crc32 = binascii.crc32(chunk_data) & 0xffffffff
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return crc32 == crc
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class JPG:
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def __init__(self):
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pass
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# 检测文件格式，返回百分比
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@staticmethod
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def test(data: bytearray):
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return 100
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# 获取图片信息
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@staticmethod
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def get_info(data: bytearray):
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info = {}
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return info
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def check_tail(data: bytearray):
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changed = False
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tail = None
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return changed, data, tail
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# 修复文件头
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@staticmethod
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def repair_sig(data: bytearray):
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changed = False
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head = None
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print('[*] 检测文件头')
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sig = b'\x89\x50\x4E\x47\x0D\x0A\x1A\x0A'
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index = data.find(sig)
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if index != -1:
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print('[x] 检测到文件头前有垃圾数据，已尝试修复')
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head = data[:index]
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data = data[index:]
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changed = True
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elif data[0:8] != sig:
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print('[x] 检测到文件头异常，已尝试修复')
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data[0:8] = sig
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changed = True
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return changed, data, head
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# 修复尺寸
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@staticmethod
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def repair_size(data: bytearray):
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changed = False
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print('[*] 检测文件尺寸')
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chunk_begin = 8
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width_begin = chunk_begin + 8
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height_begin = chunk_begin + 12
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length = int.from_bytes(data[chunk_begin:chunk_begin+4], byteorder='big')
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chunk_data = data[chunk_begin+4: chunk_begin+4+length]
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ctype = chunk_data[0:4] # 应该为 b'\x49\x48\x44\x52'，即 b'IHDR'
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width = int.from_bytes(chunk_data[4:8], byteorder='big')
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height = int.from_bytes(chunk_data[8:12], byteorder='big')
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crc = chunk_data[-4:]
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if JPG.test_ihdr_chunk(chunk_data[:-4], crc):
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print(' - 图片尺寸设置正确')
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else:
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if width == 0:
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print('[x] 检测到图片宽度设置异常，尝试修复...')
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for i in range(1, 2048):
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chunk_data[4:8] = i.to_bytes(4, byteorder='big')
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if JPG.test_ihdr_chunk(chunk_data[:-4], crc):
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width = i
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print(f'[*] 图片宽度修复成功，宽度值为{i}')
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data[width_begin: width_begin+4] = width.to_bytes(4, byteorder='big')
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changed = True
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break
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if width == 0:
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print('[x] 图片宽度修复失败')
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temp = input(f'当前宽度值为{width}，高度值为{height}，是否尝试将高度值设置为更高？可输入高度值或直接回车：')
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if temp.isdigit():
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height = int(temp)
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data[height_begin: height_begin+4] = height.to_bytes(4, byteorder='big')
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print(f'[*] 已将图片高度设置为{height}')
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changed = True
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return changed, data
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@staticmethod
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def test_ihdr_chunk(chunk_data, crc):
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crc32 = binascii.crc32(chunk_data) & 0xffffffff
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return crc32 == crc
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class GIF:
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def __init__(self):
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pass
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# 检测文件格式，返回百分比
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@staticmethod
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def test(data: bytearray):
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return 100
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# 获取图片信息
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@staticmethod
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def get_info(data: bytearray):
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info = {}
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return info
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def check_tail(data: bytearray):
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changed = False
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tail = None
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return changed, data, tail
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# 修复文件头
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@staticmethod
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def repair_sig(data: bytearray):
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changed = False
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head = None
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print('[*] 检测文件头')
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sig = b'\x89\x50\x4E\x47\x0D\x0A\x1A\x0A'
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index = data.find(sig)
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if index != -1:
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print('[x] 检测到文件头前有垃圾数据，已尝试修复')
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head = data[:index]
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data = data[index:]
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changed = True
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elif data[0:8] != sig:
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print('[x] 检测到文件头异常，已尝试修复')
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data[0:8] = sig
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changed = True
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return changed, data, head
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# 修复尺寸
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@staticmethod
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def repair_size(data: bytearray):
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changed = False
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print('[*] 检测文件尺寸')
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chunk_begin = 8
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width_begin = chunk_begin + 8
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height_begin = chunk_begin + 12
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length = int.from_bytes(data[chunk_begin:chunk_begin+4], byteorder='big')
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chunk_data = data[chunk_begin+4: chunk_begin+4+length]
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ctype = chunk_data[0:4] # 应该为 b'\x49\x48\x44\x52'，即 b'IHDR'
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width = int.from_bytes(chunk_data[4:8], byteorder='big')
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height = int.from_bytes(chunk_data[8:12], byteorder='big')
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crc = chunk_data[-4:]
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if GIF.test_ihdr_chunk(chunk_data[:-4], crc):
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print(' - 图片尺寸设置正确')
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else:
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if width == 0:
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print('[x] 检测到图片宽度设置异常，尝试修复...')
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for i in range(1, 2048):
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chunk_data[4:8] = i.to_bytes(4, byteorder='big')
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if GIF.test_ihdr_chunk(chunk_data[:-4], crc):
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width = i
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print(f'[*] 图片宽度修复成功，宽度值为{i}')
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data[width_begin: width_begin+4] = width.to_bytes(4, byteorder='big')
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changed = True
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break
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if width == 0:
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print('[x] 图片宽度修复失败')
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temp = input(f'当前宽度值为{width}，高度值为{height}，是否尝试将高度值设置为更高？可输入高度值或直接回车：')
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if temp.isdigit():
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height = int(temp)
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data[height_begin: height_begin+4] = height.to_bytes(4, byteorder='big')
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print(f'[*] 已将图片高度设置为{height}')
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changed = True
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return changed, data
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@staticmethod
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def test_ihdr_chunk(chunk_data, crc):
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crc32 = binascii.crc32(chunk_data) & 0xffffffff
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return crc32 == crc
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def check_image_type(filename: str, data: bytearray):
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file_type1 = None
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if re.match('.*\.png$', filename.lower()):
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file_type1 = 'png'
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elif re.match('.*\.jpg$', filename.lower()):
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file_type1 = 'jpg'
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elif re.match('.*\.gif$', filename.lower()):
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file_type1 = 'gif'
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file_type2 = None
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weight = 0
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weight2 = PNG.test(data)
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if weight2 > weight:
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file_type2 = 'png'
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weight = weight2
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weight2 = JPG.test(data)
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if weight2 > weight:
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file_type2 = 'jpg'
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weight = weight2
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weight2 = GIF.test(data)
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if weight2 > weight:
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file_type2 = 'gif'
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weight = weight2
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if file_type1 != None:
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if file_type1 == file_type2:
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print(f'看起来文件格式是{file_type1}')
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else:
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print(f'文件名中格式是{file_type1}，但是解析文件头格式发现{weight}%是{file_type2}')
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else:
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if file_type2 != None:
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file_type1 = file_type2
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print(f'检测文件头认为文件格式{weight}%是{file_type2}')
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else:
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print('未检测到任何图片格式特征，该文件可能不是图片文件')
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index = input('要指定文件格式吗？或者直接回车。(1、png 2、jpg 3、gif)：')
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if index.isdigit():
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index = int(index)
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if index == 1:
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file_type1 = 'png'
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elif index == 2:
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file_type1 = 'jpg'
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elif index == 3:
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file_type1 = 'gif'
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return file_type1
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# 总函数
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def main(filename: str):
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# 读取图片数据
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data = None
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with open(filename, 'rb') as f:
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data = bytearray(f.read())
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# 确定文件格式
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file_type = check_image_type(filename, data)
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model = None
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if file_type == 'png':
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model = PNG
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elif file_type == 'jpg':
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model = JPG
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elif file_type == 'gif':
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model = GIF
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# 检测并修复
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changed = False
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if model != None:
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info = model.get_info(data)
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# print(json.dumps(info))
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changed1, data, tail = model.check_tail(data)
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changed2, data, head = model.repair_sig(data)
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changed3, data, width, height = model.repair_size(data)
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changed = changed1 or changed2 or changed3
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else:
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print('[*] 未进行任何处理')
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if changed:
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# 创建结果目录
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basename = os.path.basename(filename)
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dirname = filename.replace('.', '_') + str(int(time.time()))
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dirpath = os.path.join(os.path.dirname(os.path.abspath(filename)), dirname)
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os.mkdir(dirpath)
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# 保存解析结果
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imagepath = os.path.join(dirpath, basename)
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f = open(imagepath, 'wb')
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f.write(data)
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f.close()
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if changed1 and tail:
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f = open(os.path.join(dirpath, 'tail'), 'wb')
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f.write(tail)
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f.close()
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if changed2 and head:
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f = open(os.path.join(dirpath, 'head'), 'wb')
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f.write(head)
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f.close()
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print(f'[*] 分析结果已保存到 {dirpath}')
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# 尝试打开图片看一看
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try:
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im = Image.open(imagepath)
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im.show()
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except Exception as e:
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print('[x] 尝试打开图片失败，失败原因：' + str(e))
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else:
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print('[*] 未进行任何处理')
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print('[*] 分析完成！')
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# 开始执行
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filename = sys.argv[1]
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# filename = 'G:\\1.png'
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main(filename)
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