-CXXFLAGS=-O -Wall -D_FILE_OFFSET_BITS=64
+CXXFLAGS=-O -Wall -D_FILE_OFFSET_BITS=64 -g
+LDFLAGS=-g
-OBJS=scandir.o
+OBJS=scandir.o store.o
scandir : $(OBJS)
$(CXX) $(LDFLAGS) -o $@ $^
#include <string>
#include <vector>
+#include "store.h"
+
using std::string;
using std::vector;
+static OutputStream *info_dump = NULL;
+
void scandir(const string& path);
+/* Converts time to microseconds since the epoch. */
+int64_t encode_time(time_t time)
+{
+ return (int64_t)time * 1000000;
+}
+
void dumpfile(int fd)
{
struct stat stat_buf;
char *buf;
ssize_t len;
+ dictionary file_info;
+
lstat(path.c_str(), &stat_buf);
printf("%s:\n", path.c_str());
stat_buf.st_uid, stat_buf.st_gid, stat_buf.st_nlink,
(int)stat_buf.st_blksize, (int64_t)stat_buf.st_size);
+ file_info["mode"] = encode_u16(stat_buf.st_mode & 07777);
+ file_info["atime"] = encode_u64(encode_time(stat_buf.st_atime));
+ file_info["ctime"] = encode_u64(encode_time(stat_buf.st_ctime));
+ file_info["mtime"] = encode_u64(encode_time(stat_buf.st_mtime));
+ file_info["user"] = encode_u32(stat_buf.st_uid);
+ file_info["group"] = encode_u32(stat_buf.st_gid);
+
+ char inode_type;
+
switch (stat_buf.st_mode & S_IFMT) {
case S_IFIFO:
+ printf(" FIFO\n");
+ inode_type = 'p';
+ break;
case S_IFSOCK:
+ printf(" socket\n");
+ inode_type = 's';
+ break;
case S_IFCHR:
+ printf(" character device\n");
+ inode_type = 'c';
+ break;
case S_IFBLK:
- printf(" special file\n");
+ printf(" block device\n");
+ inode_type = 'b';
break;
case S_IFLNK:
printf(" symlink\n");
+ inode_type = 'l';
/* Use the reported file size to allocate a buffer large enough to read
* the symlink. Allocate slightly more space, so that we ask for more
} else if (len > stat_buf.st_size) {
printf("error reading symlink: name truncated\n");
}
+
+ file_info["contents"] = buf;
+
delete[] buf;
break;
case S_IFREG:
printf(" regular file\n");
+ inode_type = '-';
+
/* Be paranoid when opening the file. We have no guarantee that the
* file was not replaced between the stat() call above and the open()
* call below, so we might not even be opening a regular file. That
flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
- dumpfile(fd);
+ //dumpfile(fd);
+ file_info["size"] = encode_u64(stat_buf.st_size);
close(fd);
break;
case S_IFDIR:
printf(" directory\n");
+ inode_type = 'd';
scandir(path);
break;
+
+ default:
+ fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode);
+ return;
}
+
+ file_info["type"] = string(1, inode_type);
+
+ info_dump->write_string(path);
+ info_dump->write_dictionary(file_info);
}
void scandir(const string& path)
int main(int argc, char *argv[])
{
- scandir(".");
+ FILE *dump = fopen("fileinfo", "w");
+ if (dump == NULL) {
+ fprintf(stderr, "Cannot open fileinfo: %m\n");
+ return 1;
+ }
+
+ FileOutputStream os(dump);
+ info_dump = &os;
+
+ try {
+ scandir(".");
+ } catch (IOException e) {
+ fprintf(stderr, "IOException: %s\n", e.getError().c_str());
+ }
return 0;
}
--- /dev/null
+/* LBS: An LFS-inspired filesystem backup system
+ * Copyright (C) 2006 Michael Vrable
+ *
+ * Backup data is stored in a collection of objects, which are grouped together
+ * into segments for storage purposes. This file provides interfaces for
+ * reading and writing objects and segments. */
+
+#include <assert.h>
+
+#include "store.h"
+
+using std::string;
+
+void OutputStream::write_u8(uint8_t val)
+{
+ write(&val, 1);
+}
+
+void OutputStream::write_u16(uint16_t val)
+{
+ unsigned char buf[2];
+
+ buf[0] = val & 0xff;
+ buf[1] = (val >> 8) & 0xff;
+ write(buf, 2);
+}
+
+void OutputStream::write_u32(uint32_t val)
+{
+ unsigned char buf[4];
+
+ buf[0] = val & 0xff;
+ buf[1] = (val >> 8) & 0xff;
+ buf[2] = (val >> 16) & 0xff;
+ buf[3] = (val >> 24) & 0xff;
+ write(buf, 4);
+}
+
+void OutputStream::write_u64(uint64_t val)
+{
+ unsigned char buf[8];
+
+ buf[0] = val & 0xff;
+ buf[1] = (val >> 8) & 0xff;
+ buf[2] = (val >> 16) & 0xff;
+ buf[3] = (val >> 24) & 0xff;
+ buf[4] = (val >> 32) & 0xff;
+ buf[5] = (val >> 40) & 0xff;
+ buf[6] = (val >> 48) & 0xff;
+ buf[7] = (val >> 56) & 0xff;
+ write(buf, 8);
+}
+
+/* Writes an integer to an output stream using a variable-sized representation:
+ * seven bits are written at a time (little-endian), and the eigth bit of each
+ * byte is set if more data follows. */
+void OutputStream::write_varint(uint64_t val)
+{
+ do {
+ uint8_t remainder = (val & 0x7f);
+ val >>= 7;
+ if (val)
+ remainder |= 0x80;
+ write_u8(remainder);
+ } while (val);
+}
+
+/* Write an arbitrary string by first writing out the length, followed by the
+ * data itself. */
+void OutputStream::write_string(const string &s)
+{
+ size_t len = s.length();
+ write_varint(len);
+ write(s.data(), len);
+}
+
+void OutputStream::write_dictionary(const dictionary &d)
+{
+ size_t size = d.size();
+ size_t written = 0;
+
+ write_varint(size);
+
+ for (dictionary::const_iterator i = d.begin(); i != d.end(); ++i) {
+ write_string(i->first);
+ write_string(i->second);
+ written++;
+ }
+
+ assert(written == size);
+}
+
+StringOutputStream::StringOutputStream()
+ : buf(std::ios_base::out)
+{
+}
+
+void StringOutputStream::write(const void *data, size_t len)
+{
+ buf.write((const char *)data, len);
+ if (!buf.good())
+ throw IOException("error writing to StringOutputStream");
+}
+
+FileOutputStream::FileOutputStream(FILE *file)
+{
+ f = file;
+}
+
+FileOutputStream::~FileOutputStream()
+{
+ fclose(f);
+}
+
+void FileOutputStream::write(const void *data, size_t len)
+{
+ size_t res;
+
+ res = fwrite(data, 1, len, f);
+ if (res != len) {
+ throw IOException("write error");
+ }
+}
+
+/* Utility functions, for encoding data types to strings. */
+string encode_u16(uint16_t val)
+{
+ StringOutputStream s;
+ s.write_u16(val);
+ return s.contents();
+}
+
+string encode_u32(uint32_t val)
+{
+ StringOutputStream s;
+ s.write_u32(val);
+ return s.contents();
+}
+
+string encode_u64(uint64_t val)
+{
+ StringOutputStream s;
+ s.write_u64(val);
+ return s.contents();
+}
--- /dev/null
+/* LBS: An LFS-inspired filesystem backup system
+ * Copyright (C) 2006 Michael Vrable
+ *
+ * Backup data is stored in a collection of objects, which are grouped together
+ * into segments for storage purposes. This file provides interfaces for
+ * reading and writing objects and segments. */
+
+#include <stdint.h>
+
+#include <exception>
+#include <map>
+#include <string>
+#include <sstream>
+
+typedef std::map<std::string, std::string> dictionary;
+
+class IOException : public std::exception {
+private:
+ std::string error;
+public:
+ explicit IOException(const std::string &err) { error = err; }
+ virtual ~IOException() throw () { }
+ std::string getError() const { return error; }
+};
+
+class OutputStream {
+public:
+ virtual ~OutputStream() { }
+ virtual void write(const void *data, size_t len) = 0;
+
+ /* Convenience functions for writing other data types. Values are always
+ * written out in little-endian order. */
+ void write_u8(uint8_t val);
+ void write_u16(uint16_t val);
+ void write_u32(uint32_t val);
+ void write_u64(uint64_t val);
+
+ void write_s32(int32_t val) { write_u32((uint32_t)val); }
+ void write_s64(int64_t val) { write_u64((uint64_t)val); }
+
+ void write_varint(uint64_t val);
+
+ void write_string(const std::string &s);
+ void write_dictionary(const dictionary &d);
+};
+
+class StringOutputStream : public OutputStream {
+private:
+ std::stringstream buf;
+public:
+ StringOutputStream();
+
+ virtual void write(const void *data, size_t len);
+ std::string contents() const { return buf.str(); }
+};
+
+class FileOutputStream : public OutputStream {
+private:
+ FILE *f;
+public:
+ explicit FileOutputStream(FILE *file);
+ virtual ~FileOutputStream();
+
+ virtual void write(const void *data, size_t len);
+};
+
+std::string encode_u16(uint16_t val);
+std::string encode_u32(uint32_t val);
+std::string encode_u64(uint64_t val);
projects / cumulus.git / commitdiff