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, 166 insertions, 0 deletions

diff --git a/tbdiff/tbdiff-io.c b/tbdiff/tbdiff-io.c
new file mode 100644
index 0000000..698273b
--- /dev/null
+++ b/tbdiff/tbdiff-io.c
@@ -0,0 +1,166 @@
+/*
+ *    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 <endian.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <tbdiff/tbdiff-stat.h>
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+//inverts the indices of an array of bytes.
+static void byteswap (char* value, int size) {
+    char tmp;
+    int i;
+    for (i = 0; i < size/2; i++) {
+        tmp = value[i];
+        value[i] = value[size-i-1];
+        value[size-i-1] = tmp;
+    }   
+}
+#endif
+
+size_t tbd_write_uint16_t (uint16_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_uint32_t (uint32_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_uint64_t (uint64_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_time_t (time_t value, FILE* stream) {
+    uint64_t realv = value;
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&realv, sizeof(realv));
+#endif
+    return fwrite(&realv, sizeof(realv), 1, stream);
+}
+
+size_t tbd_write_mode_t (mode_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_uid_t (uid_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_gid_t (gid_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_write_size_t (size_t value, FILE* stream) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&value, sizeof(value));
+#endif
+    return fwrite(&value, sizeof(value), 1, stream);
+}
+
+size_t tbd_read_uint16_t (uint16_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+}
+
+size_t tbd_read_uint32_t (uint32_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+}
+
+size_t tbd_read_uint64_t (uint64_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+}
+
+size_t tbd_read_time_t (time_t *value, FILE* stream) {
+    assert(value != NULL);
+    uint64_t realv;
+    size_t rval = fread(&realv, sizeof(realv), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)&realv, sizeof(realv));        
+#endif
+    *value = realv;
+    return rval;
+    }
+
+size_t tbd_read_mode_t (mode_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+    }
+
+size_t tbd_read_uid_t (uid_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+    }
+
+size_t tbd_read_gid_t (gid_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+    }
+
+size_t tbd_read_size_t (size_t *value, FILE* stream) {
+    assert(value != NULL);
+    size_t rval = fread(value, sizeof(*value), 1, stream);
+#if __BYTE_ORDER == __BIG_ENDIAN
+        byteswap((char*)value, sizeof(*value));
+#endif
+    return rval;
+    }