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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.

*/

#include "git2/common.h"

#include "git2/object.h"

#include "git2/repository.h"

#include "common.h"

#include "blob.h"

#include "filter.h"

const void *git_blob_rawcontent(const git_blob *blob)

{

assert(blob);

return blob->odb_object->raw.data;

}

git_off_t git_blob_rawsize(const git_blob *blob)

{

assert(blob);

return (git_off_t)blob->odb_object->raw.len;

}

int git_blob__getbuf(git_buf *buffer, git_blob *blob)

{

return git_buf_set(

buffer, blob->odb_object->raw.data, blob->odb_object->raw.len);

}

void git_blob__free(git_blob *blob)

{

git_odb_object_free(blob->odb_object);

git__free(blob);

}

int git_blob__parse(git_blob *blob, git_odb_object *odb_obj)

{

assert(blob);

git_cached_obj_incref((git_cached_obj *)odb_obj);

blob->odb_object = odb_obj;

return 0;

}

int git_blob_create_frombuffer(git_oid *oid, git_repository *repo, const void *buffer, size_t len)

{

int error;

git_odb *odb;

git_odb_stream *stream;

if ((error = git_repository_odb__weakptr(&odb, repo)) < 0 ||

(error = git_odb_open_wstream(&stream, odb, len, GIT_OBJ_BLOB)) < 0)

return error;

if ((error = stream->write(stream, buffer, len)) == 0)

error = stream->finalize_write(oid, stream);

stream->free(stream);

return error;

}

static int write_file_stream(

git_oid *oid, git_odb *odb, const char *path, git_off_t file_size)

{

int fd, error;

char buffer[4096];

git_odb_stream *stream = NULL;

ssize_t read_len = -1, written = 0;

if ((error = git_odb_open_wstream(

&stream, odb, (size_t)file_size, GIT_OBJ_BLOB)) < 0)

return error;

if ((fd = git_futils_open_ro(path)) < 0) {

stream->free(stream);

return -1;

}

while (!error && (read_len = p_read(fd, buffer, sizeof(buffer))) > 0) {

error = stream->write(stream, buffer, read_len);

written += read_len;

}

p_close(fd);

if (written != file_size || read_len < 0) {

giterr_set(GITERR_OS, "Failed to read file into stream");

error = -1;

}

if (!error)

error = stream->finalize_write(oid, stream);

stream->free(stream);

return error;

}

static int write_file_filtered(

git_oid *oid,

git_odb *odb,

const char *full_path,

git_vector *filters)

{

int error;

git_buf source = GIT_BUF_INIT;

git_buf dest = GIT_BUF_INIT;

if ((error = git_futils_readbuffer(&source, full_path)) < 0)

return error;

error = git_filters_apply(&dest, &source, filters);

/* Free the source as soon as possible. This can be big in memory,

* and we don't want to ODB write to choke */

git_buf_free(&source);

/* Write the file to disk if it was properly filtered */

if (!error)

error = git_odb_write(oid, odb, dest.ptr, dest.size, GIT_OBJ_BLOB);

git_buf_free(&dest);

return error;

}

static int write_symlink(

git_oid *oid, git_odb *odb, const char *path, size_t link_size)

{

char *link_data;

ssize_t read_len;

int error;

link_data = git__malloc(link_size);

GITERR_CHECK_ALLOC(link_data);

read_len = p_readlink(path, link_data, link_size);

if (read_len != (ssize_t)link_size) {

giterr_set(GITERR_OS, "Failed to create blob. Can't read symlink '%s'", path);

git__free(link_data);

return -1;

}

error = git_odb_write(oid, odb, (void *)link_data, link_size, GIT_OBJ_BLOB);

git__free(link_data);

return error;

}

static int blob_create_internal(git_oid *oid, git_repository *repo, const char *content_path, const char *hint_path, bool try_load_filters)

{

int error;

struct stat st;

git_odb *odb = NULL;

git_off_t size;

assert(hint_path || !try_load_filters);

if ((error = git_path_lstat(content_path, &st)) < 0 || (error = git_repository_odb__weakptr(&odb, repo)) < 0)

return error;

size = st.st_size;

if (S_ISLNK(st.st_mode)) {

error = write_symlink(oid, odb, content_path, (size_t)size);

} else {

git_vector write_filters = GIT_VECTOR_INIT;

int filter_count = 0;

if (try_load_filters) {

/* Load the filters for writing this file to the ODB */

filter_count = git_filters_load(

&write_filters, repo, hint_path, GIT_FILTER_TO_ODB);

}

if (filter_count < 0) {

/* Negative value means there was a critical error */

error = filter_count;

} else if (filter_count == 0) {

/* No filters need to be applied to the document: we can stream

* directly from disk */

error = write_file_stream(oid, odb, content_path, size);

} else {

/* We need to apply one or more filters */

error = write_file_filtered(oid, odb, content_path, &write_filters);

}

git_filters_free(&write_filters);

/*

* TODO: eventually support streaming filtered files, for files

* which are bigger than a given threshold. This is not a priority

* because applying a filter in streaming mode changes the final

* size of the blob, and without knowing its final size, the blob

* cannot be written in stream mode to the ODB.

*

* The plan is to do streaming writes to a tempfile on disk and then

* opening streaming that file to the ODB, using

* `write_file_stream`.

*

* CAREFULLY DESIGNED APIS YO

*/

}

return error;

}

int git_blob_create_fromworkdir(git_oid *oid, git_repository *repo, const char *path)

{

git_buf full_path = GIT_BUF_INIT;

const char *workdir;

int error;

if ((error = git_repository__ensure_not_bare(repo, "create blob from file")) < 0)

return error;

workdir = git_repository_workdir(repo);

if (git_buf_joinpath(&full_path, workdir, path) < 0) {

git_buf_free(&full_path);

return -1;

}

error = blob_create_internal(oid, repo, git_buf_cstr(&full_path), git_buf_cstr(&full_path), true);

git_buf_free(&full_path);

return error;

}

int git_blob_create_fromdisk(git_oid *oid, git_repository *repo, const char *path)

{

int error;

git_buf full_path = GIT_BUF_INIT;

if ((error = git_path_prettify(&full_path, path, NULL)) < 0) {

git_buf_free(&full_path);

return error;

}

error = blob_create_internal(oid, repo, git_buf_cstr(&full_path), git_buf_cstr(&full_path), true);

git_buf_free(&full_path);

return error;

}

#define BUFFER_SIZE 4096

int git_blob_create_fromchunks(

git_oid *oid,

git_repository *repo,

const char *hintpath,

int (*source_cb)(char *content, size_t max_length, void *payload),

void *payload)

{

int error = -1, read_bytes;

char *content = NULL;

git_filebuf file = GIT_FILEBUF_INIT;

git_buf path = GIT_BUF_INIT;

if (git_buf_join_n(

&path, '/', 3,

git_repository_path(repo),

GIT_OBJECTS_DIR,

"streamed") < 0)

goto cleanup;

content = git__malloc(BUFFER_SIZE);

GITERR_CHECK_ALLOC(content);

if (git_filebuf_open(&file, git_buf_cstr(&path), GIT_FILEBUF_TEMPORARY) < 0)

goto cleanup;

while (1) {

read_bytes = source_cb(content, BUFFER_SIZE, payload);

assert(read_bytes <= BUFFER_SIZE);

if (read_bytes <= 0)

break;

if (git_filebuf_write(&file, content, read_bytes) < 0)

goto cleanup;

}

if (read_bytes < 0)

goto cleanup;

if (git_filebuf_flush(&file) < 0)

goto cleanup;

error = blob_create_internal(oid, repo, file.path_lock, hintpath, hintpath != NULL);

cleanup:

git_buf_free(&path);

git_filebuf_cleanup(&file);

git__free(content);

return error;

}

int git_blob_is_binary(git_blob *blob)

{

git_buf content;

assert(blob);

content.ptr = blob->odb_object->raw.data;

content.size = min(blob->odb_object->raw.len, 4000);

return git_buf_text_is_binary(&content);

}