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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.
*/
#ifndef INCLUDE_reader_h__
#define INCLUDE_reader_h__
#include "common.h"
/* Returned when the workdir does not match the index */
#define GIT_READER_MISMATCH 1
typedef struct git_reader git_reader;
/*
* The `git_reader` structure is a generic interface for reading the
* contents of a file by its name, and implementations are provided
* for reading out of a tree, the index, and the working directory.
*
* Note that the reader implementation is meant to have a short
* lifecycle and does not increase the refcount of the object that
* it's reading. Callers should ensure that they do not use a
* reader after disposing the underlying object that it reads.
*/
struct git_reader {
int (*read)(git_buf *out, git_oid *out_oid, git_filemode_t *mode, git_reader *reader, const char *filename);
};
/**
* Create a `git_reader` that will allow random access to the given
* tree. Paths requested via `git_reader_read` will be rooted at this
* tree, callers are not expected to recurse through tree lookups. Thus,
* you can request to read `/src/foo.c` and the tree provided to this
* function will be searched to find another tree named `src`, which
* will then be opened to find `foo.c`.
*
* @param out The reader for the given tree
* @param tree The tree object to read
* @return 0 on success, or an error code < 0
*/
extern int git_reader_for_tree(
git_reader **out,
git_tree *tree);
/**
* Create a `git_reader` that will allow random access to the given
* index, or the repository's index.
*
* @param out The reader for the given index
* @param repo The repository containing the index
* @param index The index to read, or NULL to use the repository's index
* @return 0 on success, or an error code < 0
*/
extern int git_reader_for_index(
git_reader **out,
git_repository *repo,
git_index *index);
/**
* Create a `git_reader` that will allow random access to the given
* repository's working directory. Note that the contents are read
* in repository format, meaning any workdir -> odb filters are
* applied.
*
* If `validate_index` is set to true, reads of files will hash the
* on-disk contents and ensure that the resulting object ID matches
* the repository's index. This ensures that the working directory
* is unmodified from the index contents.
*
* @param out The reader for the given working directory
* @param repo The repository containing the working directory
* @param validate_index If true, the working directory contents will
* be compared to the index contents during read to ensure that
* the working directory is unmodified.
* @return 0 on success, or an error code < 0
*/
extern int git_reader_for_workdir(
git_reader **out,
git_repository *repo,
bool validate_index);
/**
* Read the given filename from the reader and populate the given buffer
* with the contents and the given oid with the object ID.
*
* @param out The buffer to populate with the file contents
* @param out_id The oid to populate with the object ID
* @param reader The reader to read
* @param filename The filename to read from the reader
*/
extern int git_reader_read(
git_buf *out,
git_oid *out_id,
git_filemode_t *out_filemode,
git_reader *reader,
const char *filename);
/**
* Free the given reader and any associated objects.
*
* @param reader The reader to free
*/
extern void git_reader_free(git_reader *reader);
#endif
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