sha1_file: introduce a constant for max header length
There were several instances of 32 sprinkled throughout this file, all of which were used for allocating a buffer to store the header of an object. Introduce a constant, MAX_HEADER_LEN, for this purpose. Note that this constant is slightly larger than required; the longest possible header is 28 (7 for "commit", 1 for a space, 20 for a 63-bit length in decimal, and 1 for the NUL). However, the overallocation should not cause any problems, so leave it as it is. Signed-off-by: Nbrian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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