thodg/libgit2/src/util/varint.c
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Hash : c3b7ace9
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Date : 2021-11-14T16:43:53
refactor: make util an object library Instead of simply including the utility files directly, make them a cmake object library for easy reusability between other projects within libgit2. Now the top-level `src` is responsible for platform selection, while the next-level `libgit2` and `util` configurations are responsible for identifying what objects they include.
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src/util/varint.c
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/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #include "varint.h" uintmax_t git_decode_varint(const unsigned char *bufp, size_t *varint_len) { const unsigned char *buf = bufp; unsigned char c = *buf++; uintmax_t val = c & 127; while (c & 128) { val += 1; if (!val || MSB(val, 7)) { /* This is not a valid varint_len, so it signals the error */ *varint_len = 0; return 0; /* overflow */ } c = *buf++; val = (val << 7) + (c & 127); } *varint_len = buf - bufp; return val; } int git_encode_varint(unsigned char *buf, size_t bufsize, uintmax_t value) { unsigned char varint[16]; unsigned pos = sizeof(varint) - 1; varint[pos] = value & 127; while (value >>= 7) varint[--pos] = 128 | (--value & 127); if (buf) { if (bufsize < (sizeof(varint) - pos)) return -1; memcpy(buf, varint + pos, sizeof(varint) - pos); } return sizeof(varint) - pos; }