Switch to a shared tbdiff library and make this an autotools project.

This commit converts tbdiff to being an autotools-based project. This
means that we now support the usual

  autoreconf -i && ./configure && make && make install

process, plus we provide 'make check' for the tbdiff test suite.

The tbdiff library is now build as a shared library and is also
installed into the system for others to use. The library is
libtool-versioned and ships a pkg-config file (tbdiff-1.pc).

The headers were adjusted so that only tbdiff/tbdiff.h may be included
directly; all others are considered internal. The tbdiff-create and
tbdiff-deploy tools were changed to include this header file.

The tbdiff library is still GPL, not LGPL. We might want to change this
in the future.

Thanks to switching to autotools we now have a way to make releases by
means of 'make dist' and 'make distcheck'. Unfortunately, the latter
currently fails, probably due to something being missing in
tbdiff/Makefile.am.

1 files changed, 265 insertions, 0 deletions

diff --git a/tbdiff/tbdiff-stat.c b/tbdiff/tbdiff-stat.c
new file mode 100644
index 0000000..fd8964e
--- /dev/null
+++ b/tbdiff/tbdiff-stat.c
@@ -0,0 +1,265 @@
+/*
+ *    Copyright (C) 2011-2012 Codethink Ltd.
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License Version 2 as
+ *    published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License along
+ *    with this program; if not, write to the Free Software Foundation, Inc.,
+ *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <tbdiff/tbdiff-stat.h>
+
+static tbd_stat_t*
+tbd_stat_from_path(const char *name,
+                   const char *path)
+{
+	struct stat info;
+
+	if(lstat(path, &info) != 0)
+		return NULL;
+
+	size_t nlen = strlen(name);
+	tbd_stat_t *ret = (tbd_stat_t*)malloc(sizeof(tbd_stat_t) + (nlen + 1));
+	if(ret == NULL)
+		return NULL;
+
+	ret->parent = NULL;
+	ret->size = 0;
+	ret->name   = (char*)((uintptr_t)ret + sizeof(tbd_stat_t));
+	memcpy(ret->name, name, (nlen + 1));	
+
+	if(S_ISREG(info.st_mode)) {
+		ret->type = TBD_STAT_TYPE_FILE;
+		ret->size = info.st_size;
+	} else if(S_ISDIR(info.st_mode)) {
+		ret->type = TBD_STAT_TYPE_DIR;
+		DIR *dp = opendir(path);
+
+		if(dp == NULL) {
+			free(ret);
+			return NULL;
+		}
+		
+		/* FIXME: Remove the need for directory size? */
+		struct dirent *ds;
+		for(ds = readdir(dp); ds != NULL; ds = readdir(dp)) {
+			if((strcmp(ds->d_name, ".") == 0)
+			    || (strcmp(ds->d_name, "..") == 0))
+				continue;
+
+			ret->size++;
+		}
+		closedir(dp);
+	} else if(S_ISLNK(info.st_mode))
+		ret->type = TBD_STAT_TYPE_SYMLINK;
+	else if(S_ISCHR(info.st_mode))
+		ret->type = TBD_STAT_TYPE_CHRDEV;
+	else if(S_ISBLK(info.st_mode))
+		ret->type = TBD_STAT_TYPE_BLKDEV;
+	else if(S_ISFIFO(info.st_mode))
+		ret->type = TBD_STAT_TYPE_FIFO;
+	else if(S_ISSOCK(info.st_mode))
+		ret->type = TBD_STAT_TYPE_SOCKET;
+	else {
+		free(ret);
+		return NULL;
+	}
+
+	ret->rdev  = (uint32_t)info.st_rdev;
+	ret->uid   = (uid_t)info.st_uid;
+	ret->gid   = (gid_t)info.st_gid;
+	ret->mode  = (mode_t)info.st_mode;
+	ret->mtime = (time_t)info.st_mtime;
+	return ret;
+}
+
+tbd_stat_t*
+tbd_stat(const char *path)
+{
+	tbd_stat_t *ret = tbd_stat_from_path(path, path);
+	return ret;
+}
+
+void
+tbd_stat_free(tbd_stat_t *file)
+{
+	free(file);
+}
+
+void
+tbd_stat_print(tbd_stat_t *file)
+{
+	(void)file;
+}
+
+tbd_stat_t*
+tbd_stat_entry(tbd_stat_t *file, uint32_t entry)
+{
+	if((file == NULL)
+	    || (file->type != TBD_STAT_TYPE_DIR)
+	    || (entry >= file->size))
+		return NULL;
+
+	char *path = tbd_stat_path(file);
+	DIR *dp = opendir(path);
+	free (path);
+
+	if(dp == NULL)
+		return NULL;
+
+	uintptr_t i;
+	struct dirent *ds;
+	for(i = 0; i <= entry; i++) {
+		ds = readdir(dp);
+		if(ds == NULL) {
+			closedir(dp);
+			return NULL;
+		}
+
+		if((strcmp(ds->d_name, ".") == 0) ||
+		    (strcmp(ds->d_name, "..") == 0))
+			i--;
+	}
+	char *name = strndup(ds->d_name, ds->d_reclen-offsetof(struct dirent, d_name));
+	closedir (dp);
+
+	char *spath = tbd_stat_subpath(file, name);
+	if(spath == NULL)
+		return NULL;
+
+	tbd_stat_t *ret = tbd_stat_from_path(name, (const char*)spath);
+
+	free(name);
+	free(spath);
+
+	if (ret == NULL)
+		return NULL;
+
+	ret->parent = file;
+	return ret;
+}
+
+tbd_stat_t*
+tbd_stat_entry_find(tbd_stat_t *file,
+                    const char *name)
+{
+	if((file == NULL)
+	    || (file->type != TBD_STAT_TYPE_DIR))
+		return NULL;
+
+	char *path = tbd_stat_path (file);
+	DIR *dp = opendir(path);
+	free (path);
+
+	if(dp == NULL)
+		return NULL;
+
+	struct dirent *ds;
+	for(ds = readdir(dp); ds != NULL; ds = readdir(dp)) {
+		if(strcmp(ds->d_name, name) == 0) {
+			char *spath = tbd_stat_subpath(file, ds->d_name);
+
+			if(spath == NULL) {
+				closedir (dp);
+				return NULL;
+			}
+
+			tbd_stat_t *ret = tbd_stat_from_path(ds->d_name, (const char*)spath);
+			free(spath);
+			ret->parent = file;
+
+			closedir (dp);
+			return ret;
+		}
+	}
+
+	closedir (dp);
+	return NULL;
+}
+
+char*
+tbd_stat_subpath(tbd_stat_t *file,
+                 const char  *entry)
+{
+	if(file == NULL)
+		return NULL;
+
+	size_t elen = ((entry == NULL) ? 0 : (strlen(entry) + 1));
+	size_t plen;
+
+	tbd_stat_t *root;
+	for(root = file, plen = 0;
+	    root != NULL;
+	    plen += (strlen(root->name) + 1), root = (tbd_stat_t*)root->parent);
+
+	plen += elen;
+
+	char *path = (char*)malloc(plen);
+	if(path == NULL)
+		return NULL;
+	char *ptr = &path[plen];
+
+	if(entry != NULL) {
+		ptr = (char*)((uintptr_t)ptr - elen);
+		memcpy(ptr, entry, elen);
+	}
+
+	for(root = file; root != NULL; root = (tbd_stat_t*)root->parent) {
+		size_t rlen = strlen(root->name) + 1;
+		ptr = (char*)((uintptr_t)ptr - rlen);
+		memcpy(ptr, root->name, rlen);
+		if((file != root) || (entry != NULL))
+			ptr[rlen - 1] = '/';
+	}
+
+	return path;
+}
+
+char*
+tbd_stat_path(tbd_stat_t *file)
+{
+	return tbd_stat_subpath(file, NULL);
+}
+
+int
+tbd_stat_open(tbd_stat_t *file, int flags)
+{
+	char *path = tbd_stat_path(file);
+	if(path == NULL)
+		return -1;
+	int fd = open(path, flags);
+	free(path);
+	return fd;
+}
+
+FILE*
+tbd_stat_fopen(tbd_stat_t *file,
+               const char  *mode)
+{
+	char *path = tbd_stat_path(file);
+	if(path == NULL)
+		return NULL;
+	FILE *fp = fopen(path, mode);
+	free(path);
+	return fp;
+}