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import numpy as np
ASDF_MAGIC = b"#ASDF"
BLOCK_MAGIC = b"\xd3BLK"
FITS_MAGIC = b"SIMPLE"
BLOCK_HEADER_BOILERPLATE_SIZE = 6
ASDF_STANDARD_COMMENT = b"ASDF_STANDARD"
INDEX_HEADER = b"#ASDF BLOCK INDEX"
# The maximum number of blocks supported
MAX_BLOCKS = 2**16
MAX_BLOCKS_DIGITS = int(np.ceil(np.log10(MAX_BLOCKS) + 1))
YAML_TAG_PREFIX = "tag:yaml.org,2002:"
YAML_END_MARKER_REGEX = rb"\r?\n\.\.\.((\r?\n)|$)"
STSCI_SCHEMA_URI_BASE = "http://stsci.edu/schemas/"
STSCI_SCHEMA_TAG_BASE = "tag:stsci.edu:asdf"
BLOCK_FLAG_STREAMED = 0x1
# ASDF max number size
MAX_BITS = 63
MAX_NUMBER = (1 << MAX_BITS) - 1
MIN_NUMBER = -((1 << MAX_BITS) - 2)
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