mercurial/mpatch.h

packaging: add `HG_DOCKER_OWN_USER` to `dockerdeb` like exists in `dockerrpm`

I was getting build failures when it was trying to write to the working
directory on CentOS 7 without this.  It is basically the same as was added to
the RPM builder in 4c0d4bbdc395.

For some reason, this doesn't work with Xenial, and the only solution I found
was to invoke it with UID 1000 on the host side.  It doesn't EOL until April
2024, but it also has python 3.5.2, so this build complication is the least of
the problems with supporting it after py2 is dropped.

Differential Revision: https://phab.mercurial-scm.org/D9394

#ifndef _HG_MPATCH_H_
#define _HG_MPATCH_H_

#define MPATCH_ERR_NO_MEM -3
#define MPATCH_ERR_CANNOT_BE_DECODED -2
#define MPATCH_ERR_INVALID_PATCH -1

struct mpatch_frag {
	int start, end, len;
	const char *data;
};

struct mpatch_flist {
	struct mpatch_frag *base, *head, *tail;
};

int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);
void mpatch_lfree(struct mpatch_flist *a);
int mpatch_apply(char *buf, const char *orig, ssize_t len,
                 struct mpatch_flist *l);
struct mpatch_flist *
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),
            ssize_t start, ssize_t end);

#endif