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- import io
- import os
-
- from PIL import Image
-
-
- def fsize(file):
- if isinstance(file, io.BytesIO):
- return file.getbuffer().nbytes
- elif isinstance(file, str):
- return os.path.getsize(file)
- elif hasattr(file, "seek") and hasattr(file, "tell"):
- pos = file.tell()
- file.seek(0, os.SEEK_END)
- size = file.tell()
- file.seek(pos)
- return size
- else:
- raise TypeError("Unsupported type")
-
-
- def compress_imgfile(file, max_size):
- if fsize(file) <= max_size:
- return file
- file.seek(0)
- img = Image.open(file)
- rgb_image = img.convert("RGB")
- quality = 95
- while True:
- out_buf = io.BytesIO()
- rgb_image.save(out_buf, "JPEG", quality=quality)
- if fsize(out_buf) <= max_size:
- return out_buf
- quality -= 5
-
-
- def split_string_by_utf8_length(string, max_length, max_split=0):
- encoded = string.encode("utf-8")
- start, end = 0, 0
- result = []
- while end < len(encoded):
- if max_split > 0 and len(result) >= max_split:
- result.append(encoded[start:].decode("utf-8"))
- break
- end = min(start + max_length, len(encoded))
- # 如果当前字节不是 UTF-8 编码的开始字节，则向前查找直到找到开始字节为止
- while end < len(encoded) and (encoded[end] & 0b11000000) == 0b10000000:
- end -= 1
- result.append(encoded[start:end].decode("utf-8"))
- start = end
- return result
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