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deps/libgit2/README.md  view on Meta::CPAN

Node.js, or Ruby, then there is probably a
"[language binding](#language-bindings)" that you can use to take care
of the messy tasks of calling into native code.

But if you _do_ want to use libgit2 directly - because you're building
an application in C - then you may be able use an existing binary.
There are packages for the
[vcpkg](https://github.com/Microsoft/vcpkg) and
[conan](https://conan.io/center/libgit2)
package managers.  And libgit2 is available in 
[Homebrew](https://formulae.brew.sh/formula/libgit2) and most Linux
distributions.

However, these versions _may_ be outdated and we recommend using the
latest version if possible.  Thankfully libgit2 is not hard to compile.

Quick Start
===========

**Prerequisites** for building libgit2:

deps/libgit2/deps/zlib/adler32.c  view on Meta::CPAN

    z_off64_t len2;
{
    unsigned long sum1;
    unsigned long sum2;
    unsigned rem;

    /* for negative len, return invalid adler32 as a clue for debugging */
    if (len2 < 0)
        return 0xffffffffUL;

    /* the derivation of this formula is left as an exercise for the reader */
    MOD63(len2);                /* assumes len2 >= 0 */
    rem = (unsigned)len2;
    sum1 = adler1 & 0xffff;
    sum2 = rem * sum1;
    MOD(sum2);
    sum1 += (adler2 & 0xffff) + BASE - 1;
    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
    if (sum1 >= BASE) sum1 -= BASE;
    if (sum1 >= BASE) sum1 -= BASE;
    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);