view mercurial/mpatch.h @ 51284:58d39c7865e5

usage: configure uncompressed chunk cache through resource configuration

Let's use this new concept for what it is meant for.

This provides a sizable speed up for reading multiple revision for some complexe
repositories.


### data-env-vars.name            = pypy-2018-08-01-zstd-sparse-revlog
  # benchmark.name                = hg.perf.read-revisions
  # benchmark.variants.order      = reverse
memory-medium: 1.892400
memory-high:   1.722934   (-8.61%)
  # benchmark.variants.order      = default
memory-medium: 1.751542
memory-high:   1.589340   (-9.49%)

#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