2023-09-11 17:49:30 -04:00
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import struct
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from enum import IntEnum
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class GGUFValueType(IntEnum):
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UINT8 = 0
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INT8 = 1
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UINT16 = 2
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INT16 = 3
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UINT32 = 4
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INT32 = 5
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FLOAT32 = 6
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BOOL = 7
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STRING = 8
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ARRAY = 9
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UINT64 = 10
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INT64 = 11
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FLOAT64 = 12
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_simple_value_packing = {
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GGUFValueType.UINT8: "<B",
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GGUFValueType.INT8: "<b",
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GGUFValueType.UINT16: "<H",
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GGUFValueType.INT16: "<h",
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GGUFValueType.UINT32: "<I",
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GGUFValueType.INT32: "<i",
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GGUFValueType.FLOAT32: "<f",
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GGUFValueType.UINT64: "<Q",
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GGUFValueType.INT64: "<q",
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GGUFValueType.FLOAT64: "<d",
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GGUFValueType.BOOL: "?",
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}
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value_type_info = {
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GGUFValueType.UINT8: 1,
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GGUFValueType.INT8: 1,
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GGUFValueType.UINT16: 2,
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GGUFValueType.INT16: 2,
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GGUFValueType.UINT32: 4,
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GGUFValueType.INT32: 4,
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GGUFValueType.FLOAT32: 4,
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GGUFValueType.UINT64: 8,
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GGUFValueType.INT64: 8,
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GGUFValueType.FLOAT64: 8,
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GGUFValueType.BOOL: 1,
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}
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def get_single(value_type, file):
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if value_type == GGUFValueType.STRING:
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value_length = struct.unpack("<Q", file.read(8))[0]
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2023-09-11 18:49:15 -04:00
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value = file.read(value_length)
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try:
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value = value.decode('utf-8')
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except:
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pass
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2023-09-11 17:49:30 -04:00
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else:
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type_str = _simple_value_packing.get(value_type)
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bytes_length = value_type_info.get(value_type)
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value = struct.unpack(type_str, file.read(bytes_length))[0]
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return value
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def load_metadata(fname):
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metadata = {}
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with open(fname, 'rb') as file:
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GGUF_MAGIC = struct.unpack("<I", file.read(4))[0]
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GGUF_VERSION = struct.unpack("<I", file.read(4))[0]
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ti_data_count = struct.unpack("<Q", file.read(8))[0]
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kv_data_count = struct.unpack("<Q", file.read(8))[0]
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2023-09-19 16:13:03 -04:00
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2023-09-19 16:13:13 -04:00
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if GGUF_VERSION == 1:
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2023-09-12 16:02:42 -04:00
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raise Exception('You are using an outdated GGUF, please download a new one.')
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2023-09-11 17:49:30 -04:00
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for i in range(kv_data_count):
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key_length = struct.unpack("<Q", file.read(8))[0]
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key = file.read(key_length)
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value_type = GGUFValueType(struct.unpack("<I", file.read(4))[0])
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if value_type == GGUFValueType.ARRAY:
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ltype = GGUFValueType(struct.unpack("<I", file.read(4))[0])
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length = struct.unpack("<Q", file.read(8))[0]
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for j in range(length):
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_ = get_single(ltype, file)
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else:
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value = get_single(value_type, file)
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metadata[key.decode()] = value
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return metadata
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