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filter.c

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/*

* Copyright (C) 2009-2012 the libgit2 contributors

*

* 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 "common.h"

#include "fileops.h"

#include "hash.h"

#include "filter.h"

#include "repository.h"

#include "git2/config.h"

#include "blob.h"

int git_filters_load(git_vector *filters, git_repository *repo, const char *path, int mode)

{

int error;

if (mode == GIT_FILTER_TO_ODB) {

/* Load the CRLF cleanup filter when writing to the ODB */

error = git_filter_add__crlf_to_odb(filters, repo, path);

if (error < 0)

return error;

} else {

error = git_filter_add__crlf_to_workdir(filters, repo, path);

if (error < 0)

return error;

}

return (int)filters->length;

}

void git_filters_free(git_vector *filters)

{

size_t i;

git_filter *filter;

git_vector_foreach(filters, i, filter) {

if (filter->do_free != NULL)

filter->do_free(filter);

else

git__free(filter);

}

git_vector_free(filters);

}

int git_filters_apply(git_buf *dest, git_buf *source, git_vector *filters)

{

unsigned int i, src;

git_buf *dbuffer[2];

dbuffer[0] = source;

dbuffer[1] = dest;

src = 0;

if (git_buf_len(source) == 0) {

git_buf_clear(dest);

return 0;

}

/* Pre-grow the destination buffer to more or less the size

* we expect it to have */

if (git_buf_grow(dest, git_buf_len(source)) < 0)

return -1;

for (i = 0; i < filters->length; ++i) {

git_filter *filter = git_vector_get(filters, i);

unsigned int dst = 1 - src;

git_buf_clear(dbuffer[dst]);

/* Apply the filter from dbuffer[src] to the other buffer;

* if the filtering is canceled by the user mid-filter,

* we skip to the next filter without changing the source

* of the double buffering (so that the text goes through

* cleanly).

*/

if (filter->apply(filter, dbuffer[dst], dbuffer[src]) == 0)

src = dst;

if (git_buf_oom(dbuffer[dst]))

return -1;

}

/* Ensure that the output ends up in dbuffer[1] (i.e. the dest) */

if (src != 1)

git_buf_swap(dest, source);

return 0;

}