From 84b6292c33d71b5739828d08aa8101d1954577f2 Mon Sep 17 00:00:00 2001
From: Mike Lockwood <lockwood@google.com>
Date: Thu, 3 Oct 2013 10:30:18 -0700
Subject: move libandroidfw to frameworks/native

Change-Id: Ic5b8a2742c7141156ab0f00ca29097bfe92bce60
---
 libs/androidfw/BackupHelpers.cpp | 1591 --------------------------------------
 1 file changed, 1591 deletions(-)
 delete mode 100644 libs/androidfw/BackupHelpers.cpp

(limited to 'libs/androidfw/BackupHelpers.cpp')

diff --git a/libs/androidfw/BackupHelpers.cpp b/libs/androidfw/BackupHelpers.cpp
deleted file mode 100644
index b8d3f48e3347..000000000000
--- a/libs/androidfw/BackupHelpers.cpp
+++ /dev/null
@@ -1,1591 +0,0 @@
-/*
- * Copyright (C) 2009 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define LOG_TAG "file_backup_helper"
-
-#include <androidfw/BackupHelpers.h>
-
-#include <utils/KeyedVector.h>
-#include <utils/ByteOrder.h>
-#include <utils/String8.h>
-
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/uio.h>
-#include <sys/stat.h>
-#include <sys/time.h>  // for utimes
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <utime.h>
-#include <fcntl.h>
-#include <zlib.h>
-
-#include <cutils/log.h>
-
-namespace android {
-
-#define MAGIC0 0x70616e53 // Snap
-#define MAGIC1 0x656c6946 // File
-
-/*
- * File entity data format (v1):
- *
- *   - 4-byte version number of the metadata, little endian (0x00000001 for v1)
- *   - 12 bytes of metadata
- *   - the file data itself
- *
- * i.e. a 16-byte metadata header followed by the raw file data.  If the
- * restore code does not recognize the metadata version, it can still
- * interpret the file data itself correctly.
- *
- * file_metadata_v1:
- *
- *   - 4 byte version number === 0x00000001 (little endian)
- *   - 4-byte access mode (little-endian)
- *   - undefined (8 bytes)
- */
-
-struct file_metadata_v1 {
-    int version;
-    int mode;
-    int undefined_1;
-    int undefined_2;
-};
-
-const static int CURRENT_METADATA_VERSION = 1;
-
-#if 1
-#define LOGP(f, x...)
-#else
-#if TEST_BACKUP_HELPERS
-#define LOGP(f, x...) printf(f "\n", x)
-#else
-#define LOGP(x...) ALOGD(x)
-#endif
-#endif
-
-const static int ROUND_UP[4] = { 0, 3, 2, 1 };
-
-static inline int
-round_up(int n)
-{
-    return n + ROUND_UP[n % 4];
-}
-
-static int
-read_snapshot_file(int fd, KeyedVector<String8,FileState>* snapshot)
-{
-    int bytesRead = 0;
-    int amt;
-    SnapshotHeader header;
-
-    amt = read(fd, &header, sizeof(header));
-    if (amt != sizeof(header)) {
-        return errno;
-    }
-    bytesRead += amt;
-
-    if (header.magic0 != MAGIC0 || header.magic1 != MAGIC1) {
-        ALOGW("read_snapshot_file header.magic0=0x%08x magic1=0x%08x", header.magic0, header.magic1);
-        return 1;
-    }
-
-    for (int i=0; i<header.fileCount; i++) {
-        FileState file;
-        char filenameBuf[128];
-
-        amt = read(fd, &file, sizeof(FileState));
-        if (amt != sizeof(FileState)) {
-            ALOGW("read_snapshot_file FileState truncated/error with read at %d bytes\n", bytesRead);
-            return 1;
-        }
-        bytesRead += amt;
-
-        // filename is not NULL terminated, but it is padded
-        int nameBufSize = round_up(file.nameLen);
-        char* filename = nameBufSize <= (int)sizeof(filenameBuf)
-                ? filenameBuf
-                : (char*)malloc(nameBufSize);
-        amt = read(fd, filename, nameBufSize);
-        if (amt == nameBufSize) {
-            snapshot->add(String8(filename, file.nameLen), file);
-        }
-        bytesRead += amt;
-        if (filename != filenameBuf) {
-            free(filename);
-        }
-        if (amt != nameBufSize) {
-            ALOGW("read_snapshot_file filename truncated/error with read at %d bytes\n", bytesRead);
-            return 1;
-        }
-    }
-
-    if (header.totalSize != bytesRead) {
-        ALOGW("read_snapshot_file length mismatch: header.totalSize=%d bytesRead=%d\n",
-                header.totalSize, bytesRead);
-        return 1;
-    }
-
-    return 0;
-}
-
-static int
-write_snapshot_file(int fd, const KeyedVector<String8,FileRec>& snapshot)
-{
-    int fileCount = 0;
-    int bytesWritten = sizeof(SnapshotHeader);
-    // preflight size
-    const int N = snapshot.size();
-    for (int i=0; i<N; i++) {
-        const FileRec& g = snapshot.valueAt(i);
-        if (!g.deleted) {
-            const String8& name = snapshot.keyAt(i);
-            bytesWritten += sizeof(FileState) + round_up(name.length());
-            fileCount++;
-        }
-    }
-
-    LOGP("write_snapshot_file fd=%d\n", fd);
-
-    int amt;
-    SnapshotHeader header = { MAGIC0, fileCount, MAGIC1, bytesWritten };
-
-    amt = write(fd, &header, sizeof(header));
-    if (amt != sizeof(header)) {
-        ALOGW("write_snapshot_file error writing header %s", strerror(errno));
-        return errno;
-    }
-
-    for (int i=0; i<N; i++) {
-        FileRec r = snapshot.valueAt(i);
-        if (!r.deleted) {
-            const String8& name = snapshot.keyAt(i);
-            int nameLen = r.s.nameLen = name.length();
-
-            amt = write(fd, &r.s, sizeof(FileState));
-            if (amt != sizeof(FileState)) {
-                ALOGW("write_snapshot_file error writing header %s", strerror(errno));
-                return 1;
-            }
-
-            // filename is not NULL terminated, but it is padded
-            amt = write(fd, name.string(), nameLen);
-            if (amt != nameLen) {
-                ALOGW("write_snapshot_file error writing filename %s", strerror(errno));
-                return 1;
-            }
-            int paddingLen = ROUND_UP[nameLen % 4];
-            if (paddingLen != 0) {
-                int padding = 0xabababab;
-                amt = write(fd, &padding, paddingLen);
-                if (amt != paddingLen) {
-                    ALOGW("write_snapshot_file error writing %d bytes of filename padding %s",
-                            paddingLen, strerror(errno));
-                    return 1;
-                }
-            }
-        }
-    }
-
-    return 0;
-}
-
-static int
-write_delete_file(BackupDataWriter* dataStream, const String8& key)
-{
-    LOGP("write_delete_file %s\n", key.string());
-    return dataStream->WriteEntityHeader(key, -1);
-}
-
-static int
-write_update_file(BackupDataWriter* dataStream, int fd, int mode, const String8& key,
-        char const* realFilename)
-{
-    LOGP("write_update_file %s (%s) : mode 0%o\n", realFilename, key.string(), mode);
-
-    const int bufsize = 4*1024;
-    int err;
-    int amt;
-    int fileSize;
-    int bytesLeft;
-    file_metadata_v1 metadata;
-
-    char* buf = (char*)malloc(bufsize);
-    int crc = crc32(0L, Z_NULL, 0);
-
-
-    fileSize = lseek(fd, 0, SEEK_END);
-    lseek(fd, 0, SEEK_SET);
-
-    if (sizeof(metadata) != 16) {
-        ALOGE("ERROR: metadata block is the wrong size!");
-    }
-
-    bytesLeft = fileSize + sizeof(metadata);
-    err = dataStream->WriteEntityHeader(key, bytesLeft);
-    if (err != 0) {
-        free(buf);
-        return err;
-    }
-
-    // store the file metadata first
-    metadata.version = tolel(CURRENT_METADATA_VERSION);
-    metadata.mode = tolel(mode);
-    metadata.undefined_1 = metadata.undefined_2 = 0;
-    err = dataStream->WriteEntityData(&metadata, sizeof(metadata));
-    if (err != 0) {
-        free(buf);
-        return err;
-    }
-    bytesLeft -= sizeof(metadata); // bytesLeft should == fileSize now
-
-    // now store the file content
-    while ((amt = read(fd, buf, bufsize)) != 0 && bytesLeft > 0) {
-        bytesLeft -= amt;
-        if (bytesLeft < 0) {
-            amt += bytesLeft; // Plus a negative is minus.  Don't write more than we promised.
-        }
-        err = dataStream->WriteEntityData(buf, amt);
-        if (err != 0) {
-            free(buf);
-            return err;
-        }
-    }
-    if (bytesLeft != 0) {
-        if (bytesLeft > 0) {
-            // Pad out the space we promised in the buffer.  We can't corrupt the buffer,
-            // even though the data we're sending is probably bad.
-            memset(buf, 0, bufsize);
-            while (bytesLeft > 0) {
-                amt = bytesLeft < bufsize ? bytesLeft : bufsize;
-                bytesLeft -= amt;
-                err = dataStream->WriteEntityData(buf, amt);
-                if (err != 0) {
-                    free(buf);
-                    return err;
-                }
-            }
-        }
-        ALOGE("write_update_file size mismatch for %s. expected=%d actual=%d."
-                " You aren't doing proper locking!", realFilename, fileSize, fileSize-bytesLeft);
-    }
-
-    free(buf);
-    return NO_ERROR;
-}
-
-static int
-write_update_file(BackupDataWriter* dataStream, const String8& key, char const* realFilename)
-{
-    int err;
-    struct stat st;
-
-    err = stat(realFilename, &st);
-    if (err < 0) {
-        return errno;
-    }
-
-    int fd = open(realFilename, O_RDONLY);
-    if (fd == -1) {
-        return errno;
-    }
-
-    err = write_update_file(dataStream, fd, st.st_mode, key, realFilename);
-    close(fd);
-    return err;
-}
-
-static int
-compute_crc32(int fd)
-{
-    const int bufsize = 4*1024;
-    int amt;
-
-    char* buf = (char*)malloc(bufsize);
-    int crc = crc32(0L, Z_NULL, 0);
-
-    lseek(fd, 0, SEEK_SET);
-
-    while ((amt = read(fd, buf, bufsize)) != 0) {
-        crc = crc32(crc, (Bytef*)buf, amt);
-    }
-
-    free(buf);
-    return crc;
-}
-
-int
-back_up_files(int oldSnapshotFD, BackupDataWriter* dataStream, int newSnapshotFD,
-        char const* const* files, char const* const* keys, int fileCount)
-{
-    int err;
-    KeyedVector<String8,FileState> oldSnapshot;
-    KeyedVector<String8,FileRec> newSnapshot;
-
-    if (oldSnapshotFD != -1) {
-        err = read_snapshot_file(oldSnapshotFD, &oldSnapshot);
-        if (err != 0) {
-            // On an error, treat this as a full backup.
-            oldSnapshot.clear();
-        }
-    }
-
-    for (int i=0; i<fileCount; i++) {
-        String8 key(keys[i]);
-        FileRec r;
-        char const* file = files[i];
-        r.file = file;
-        struct stat st;
-
-        err = stat(file, &st);
-        if (err != 0) {
-            r.deleted = true;
-        } else {
-            r.deleted = false;
-            r.s.modTime_sec = st.st_mtime;
-            r.s.modTime_nsec = 0; // workaround sim breakage
-            //r.s.modTime_nsec = st.st_mtime_nsec;
-            r.s.mode = st.st_mode;
-            r.s.size = st.st_size;
-            // we compute the crc32 later down below, when we already have the file open.
-
-            if (newSnapshot.indexOfKey(key) >= 0) {
-                LOGP("back_up_files key already in use '%s'", key.string());
-                return -1;
-            }
-        }
-        newSnapshot.add(key, r);
-    }
-
-    int n = 0;
-    int N = oldSnapshot.size();
-    int m = 0;
-
-    while (n<N && m<fileCount) {
-        const String8& p = oldSnapshot.keyAt(n);
-        const String8& q = newSnapshot.keyAt(m);
-        FileRec& g = newSnapshot.editValueAt(m);
-        int cmp = p.compare(q);
-        if (g.deleted || cmp < 0) {
-            // file removed
-            LOGP("file removed: %s", p.string());
-            g.deleted = true; // They didn't mention the file, but we noticed that it's gone.
-            dataStream->WriteEntityHeader(p, -1);
-            n++;
-        }
-        else if (cmp > 0) {
-            // file added
-            LOGP("file added: %s", g.file.string());
-            write_update_file(dataStream, q, g.file.string());
-            m++;
-        }
-        else {
-            // both files exist, check them
-            const FileState& f = oldSnapshot.valueAt(n);
-
-            int fd = open(g.file.string(), O_RDONLY);
-            if (fd < 0) {
-                // We can't open the file.  Don't report it as a delete either.  Let the
-                // server keep the old version.  Maybe they'll be able to deal with it
-                // on restore.
-                LOGP("Unable to open file %s - skipping", g.file.string());
-            } else {
-                g.s.crc32 = compute_crc32(fd);
-
-                LOGP("%s", q.string());
-                LOGP("  new: modTime=%d,%d mode=%04o size=%-3d crc32=0x%08x",
-                        f.modTime_sec, f.modTime_nsec, f.mode, f.size, f.crc32);
-                LOGP("  old: modTime=%d,%d mode=%04o size=%-3d crc32=0x%08x",
-                        g.s.modTime_sec, g.s.modTime_nsec, g.s.mode, g.s.size, g.s.crc32);
-                if (f.modTime_sec != g.s.modTime_sec || f.modTime_nsec != g.s.modTime_nsec
-                        || f.mode != g.s.mode || f.size != g.s.size || f.crc32 != g.s.crc32) {
-                    write_update_file(dataStream, fd, g.s.mode, p, g.file.string());
-                }
-
-                close(fd);
-            }
-            n++;
-            m++;
-        }
-    }
-
-    // these were deleted
-    while (n<N) {
-        dataStream->WriteEntityHeader(oldSnapshot.keyAt(n), -1);
-        n++;
-    }
-
-    // these were added
-    while (m<fileCount) {
-        const String8& q = newSnapshot.keyAt(m);
-        FileRec& g = newSnapshot.editValueAt(m);
-        write_update_file(dataStream, q, g.file.string());
-        m++;
-    }
-
-    err = write_snapshot_file(newSnapshotFD, newSnapshot);
-
-    return 0;
-}
-
-// Utility function, equivalent to stpcpy(): perform a strcpy, but instead of
-// returning the initial dest, return a pointer to the trailing NUL.
-static char* strcpy_ptr(char* dest, const char* str) {
-    if (dest && str) {
-        while ((*dest = *str) != 0) {
-            dest++;
-            str++;
-        }
-    }
-    return dest;
-}
-
-static void calc_tar_checksum(char* buf) {
-    // [ 148 :   8 ] checksum -- to be calculated with this field as space chars
-    memset(buf + 148, ' ', 8);
-
-    uint16_t sum = 0;
-    for (uint8_t* p = (uint8_t*) buf; p < ((uint8_t*)buf) + 512; p++) {
-        sum += *p;
-    }
-
-    // Now write the real checksum value:
-    // [ 148 :   8 ]  checksum: 6 octal digits [leading zeroes], NUL, SPC
-    sprintf(buf + 148, "%06o", sum); // the trailing space is already in place
-}
-
-// Returns number of bytes written
-static int write_pax_header_entry(char* buf, const char* key, const char* value) {
-    // start with the size of "1 key=value\n"
-    int len = strlen(key) + strlen(value) + 4;
-    if (len > 9) len++;
-    if (len > 99) len++;
-    if (len > 999) len++;
-    // since PATH_MAX is 4096 we don't expect to have to generate any single
-    // header entry longer than 9999 characters
-
-    return sprintf(buf, "%d %s=%s\n", len, key, value);
-}
-
-// Wire format to the backup manager service is chunked:  each chunk is prefixed by
-// a 4-byte count of its size.  A chunk size of zero (four zero bytes) indicates EOD.
-void send_tarfile_chunk(BackupDataWriter* writer, const char* buffer, size_t size) {
-    uint32_t chunk_size_no = htonl(size);
-    writer->WriteEntityData(&chunk_size_no, 4);
-    if (size != 0) writer->WriteEntityData(buffer, size);
-}
-
-int write_tarfile(const String8& packageName, const String8& domain,
-        const String8& rootpath, const String8& filepath, BackupDataWriter* writer)
-{
-    // In the output stream everything is stored relative to the root
-    const char* relstart = filepath.string() + rootpath.length();
-    if (*relstart == '/') relstart++;     // won't be true when path == rootpath
-    String8 relpath(relstart);
-
-    // If relpath is empty, it means this is the top of one of the standard named
-    // domain directories, so we should just skip it
-    if (relpath.length() == 0) {
-        return 0;
-    }
-
-    // Too long a name for the ustar format?
-    //    "apps/" + packagename + '/' + domainpath < 155 chars
-    //    relpath < 100 chars
-    bool needExtended = false;
-    if ((5 + packageName.length() + 1 + domain.length() >= 155) || (relpath.length() >= 100)) {
-        needExtended = true;
-    }
-
-    // Non-7bit-clean path also means needing pax extended format
-    if (!needExtended) {
-        for (size_t i = 0; i < filepath.length(); i++) {
-            if ((filepath[i] & 0x80) != 0) {
-                needExtended = true;
-                break;
-            }
-        }
-    }
-
-    int err = 0;
-    struct stat64 s;
-    if (lstat64(filepath.string(), &s) != 0) {
-        err = errno;
-        ALOGE("Error %d (%s) from lstat64(%s)", err, strerror(err), filepath.string());
-        return err;
-    }
-
-    String8 fullname;   // for pax later on
-    String8 prefix;
-
-    const int isdir = S_ISDIR(s.st_mode);
-    if (isdir) s.st_size = 0;   // directories get no actual data in the tar stream
-
-    // !!! TODO: use mmap when possible to avoid churning the buffer cache
-    // !!! TODO: this will break with symlinks; need to use readlink(2)
-    int fd = open(filepath.string(), O_RDONLY);
-    if (fd < 0) {
-        err = errno;
-        ALOGE("Error %d (%s) from open(%s)", err, strerror(err), filepath.string());
-        return err;
-    }
-
-    // read/write up to this much at a time.
-    const size_t BUFSIZE = 32 * 1024;
-    char* buf = (char *)calloc(1,BUFSIZE);
-    char* paxHeader = buf + 512;    // use a different chunk of it as separate scratch
-    char* paxData = buf + 1024;
-
-    if (buf == NULL) {
-        ALOGE("Out of mem allocating transfer buffer");
-        err = ENOMEM;
-        goto done;
-    }
-
-    // Magic fields for the ustar file format
-    strcat(buf + 257, "ustar");
-    strcat(buf + 263, "00");
-
-    // [ 265 : 32 ] user name, ignored on restore
-    // [ 297 : 32 ] group name, ignored on restore
-
-    // [ 100 :   8 ] file mode
-    snprintf(buf + 100, 8, "%06o ", s.st_mode & ~S_IFMT);
-
-    // [ 108 :   8 ] uid -- ignored in Android format; uids are remapped at restore time
-    // [ 116 :   8 ] gid -- ignored in Android format
-    snprintf(buf + 108, 8, "0%lo", s.st_uid);
-    snprintf(buf + 116, 8, "0%lo", s.st_gid);
-
-    // [ 124 :  12 ] file size in bytes
-    if (s.st_size > 077777777777LL) {
-        // very large files need a pax extended size header
-        needExtended = true;
-    }
-    snprintf(buf + 124, 12, "%011llo", (isdir) ? 0LL : s.st_size);
-
-    // [ 136 :  12 ] last mod time as a UTC time_t
-    snprintf(buf + 136, 12, "%0lo", s.st_mtime);
-
-    // [ 156 :   1 ] link/file type
-    uint8_t type;
-    if (isdir) {
-        type = '5';     // tar magic: '5' == directory
-    } else if (S_ISREG(s.st_mode)) {
-        type = '0';     // tar magic: '0' == normal file
-    } else {
-        ALOGW("Error: unknown file mode 0%o [%s]", s.st_mode, filepath.string());
-        goto cleanup;
-    }
-    buf[156] = type;
-
-    // [ 157 : 100 ] name of linked file [not implemented]
-
-    {
-        // Prefix and main relative path.  Path lengths have been preflighted.
-        if (packageName.length() > 0) {
-            prefix = "apps/";
-            prefix += packageName;
-        }
-        if (domain.length() > 0) {
-            prefix.appendPath(domain);
-        }
-
-        // pax extended means we don't put in a prefix field, and put a different
-        // string in the basic name field.  We can also construct the full path name
-        // out of the substrings we've now built.
-        fullname = prefix;
-        fullname.appendPath(relpath);
-
-        // ustar:
-        //    [   0 : 100 ]; file name/path
-        //    [ 345 : 155 ] filename path prefix
-        // We only use the prefix area if fullname won't fit in the path
-        if (fullname.length() > 100) {
-            strncpy(buf, relpath.string(), 100);
-            strncpy(buf + 345, prefix.string(), 155);
-        } else {
-            strncpy(buf, fullname.string(), 100);
-        }
-    }
-
-    // [ 329 : 8 ] and [ 337 : 8 ] devmajor/devminor, not used
-
-    ALOGI("   Name: %s", fullname.string());
-
-    // If we're using a pax extended header, build & write that here; lengths are
-    // already preflighted
-    if (needExtended) {
-        char sizeStr[32];   // big enough for a 64-bit unsigned value in decimal
-        char* p = paxData;
-
-        // construct the pax extended header data block
-        memset(paxData, 0, BUFSIZE - (paxData - buf));
-        int len;
-
-        // size header -- calc len in digits by actually rendering the number
-        // to a string - brute force but simple
-        snprintf(sizeStr, sizeof(sizeStr), "%lld", s.st_size);
-        p += write_pax_header_entry(p, "size", sizeStr);
-
-        // fullname was generated above with the ustar paths
-        p += write_pax_header_entry(p, "path", fullname.string());
-
-        // Now we know how big the pax data is
-        int paxLen = p - paxData;
-
-        // Now build the pax *header* templated on the ustar header
-        memcpy(paxHeader, buf, 512);
-
-        String8 leaf = fullname.getPathLeaf();
-        memset(paxHeader, 0, 100);                  // rewrite the name area
-        snprintf(paxHeader, 100, "PaxHeader/%s", leaf.string());
-        memset(paxHeader + 345, 0, 155);            // rewrite the prefix area
-        strncpy(paxHeader + 345, prefix.string(), 155);
-
-        paxHeader[156] = 'x';                       // mark it as a pax extended header
-
-        // [ 124 :  12 ] size of pax extended header data
-        memset(paxHeader + 124, 0, 12);
-        snprintf(paxHeader + 124, 12, "%011o", p - paxData);
-
-        // Checksum and write the pax block header
-        calc_tar_checksum(paxHeader);
-        send_tarfile_chunk(writer, paxHeader, 512);
-
-        // Now write the pax data itself
-        int paxblocks = (paxLen + 511) / 512;
-        send_tarfile_chunk(writer, paxData, 512 * paxblocks);
-    }
-
-    // Checksum and write the 512-byte ustar file header block to the output
-    calc_tar_checksum(buf);
-    send_tarfile_chunk(writer, buf, 512);
-
-    // Now write the file data itself, for real files.  We honor tar's convention that
-    // only full 512-byte blocks are sent to write().
-    if (!isdir) {
-        off64_t toWrite = s.st_size;
-        while (toWrite > 0) {
-            size_t toRead = (toWrite < BUFSIZE) ? toWrite : BUFSIZE;
-            ssize_t nRead = read(fd, buf, toRead);
-            if (nRead < 0) {
-                err = errno;
-                ALOGE("Unable to read file [%s], err=%d (%s)", filepath.string(),
-                        err, strerror(err));
-                break;
-            } else if (nRead == 0) {
-                ALOGE("EOF but expect %lld more bytes in [%s]", (long long) toWrite,
-                        filepath.string());
-                err = EIO;
-                break;
-            }
-
-            // At EOF we might have a short block; NUL-pad that to a 512-byte multiple.  This
-            // depends on the OS guarantee that for ordinary files, read() will never return
-            // less than the number of bytes requested.
-            ssize_t partial = (nRead+512) % 512;
-            if (partial > 0) {
-                ssize_t remainder = 512 - partial;
-                memset(buf + nRead, 0, remainder);
-                nRead += remainder;
-            }
-            send_tarfile_chunk(writer, buf, nRead);
-            toWrite -= nRead;
-        }
-    }
-
-cleanup:
-    free(buf);
-done:
-    close(fd);
-    return err;
-}
-// end tarfile
-
-
-
-#define RESTORE_BUF_SIZE (8*1024)
-
-RestoreHelperBase::RestoreHelperBase()
-{
-    m_buf = malloc(RESTORE_BUF_SIZE);
-    m_loggedUnknownMetadata = false;
-}
-
-RestoreHelperBase::~RestoreHelperBase()
-{
-    free(m_buf);
-}
-
-status_t
-RestoreHelperBase::WriteFile(const String8& filename, BackupDataReader* in)
-{
-    ssize_t err;
-    size_t dataSize;
-    String8 key;
-    int fd;
-    void* buf = m_buf;
-    ssize_t amt;
-    int mode;
-    int crc;
-    struct stat st;
-    FileRec r;
-
-    err = in->ReadEntityHeader(&key, &dataSize);
-    if (err != NO_ERROR) {
-        return err;
-    }
-
-    // Get the metadata block off the head of the file entity and use that to
-    // set up the output file
-    file_metadata_v1 metadata;
-    amt = in->ReadEntityData(&metadata, sizeof(metadata));
-    if (amt != sizeof(metadata)) {
-        ALOGW("Could not read metadata for %s -- %ld / %s", filename.string(),
-                (long)amt, strerror(errno));
-        return EIO;
-    }
-    metadata.version = fromlel(metadata.version);
-    metadata.mode = fromlel(metadata.mode);
-    if (metadata.version > CURRENT_METADATA_VERSION) {
-        if (!m_loggedUnknownMetadata) {
-            m_loggedUnknownMetadata = true;
-            ALOGW("Restoring file with unsupported metadata version %d (currently %d)",
-                    metadata.version, CURRENT_METADATA_VERSION);
-        }
-    }
-    mode = metadata.mode;
-
-    // Write the file and compute the crc
-    crc = crc32(0L, Z_NULL, 0);
-    fd = open(filename.string(), O_CREAT|O_RDWR|O_TRUNC, mode);
-    if (fd == -1) {
-        ALOGW("Could not open file %s -- %s", filename.string(), strerror(errno));
-        return errno;
-    }
-    
-    while ((amt = in->ReadEntityData(buf, RESTORE_BUF_SIZE)) > 0) {
-        err = write(fd, buf, amt);
-        if (err != amt) {
-            close(fd);
-            ALOGW("Error '%s' writing '%s'", strerror(errno), filename.string());
-            return errno;
-        }
-        crc = crc32(crc, (Bytef*)buf, amt);
-    }
-
-    close(fd);
-
-    // Record for the snapshot
-    err = stat(filename.string(), &st);
-    if (err != 0) {
-        ALOGW("Error stating file that we just created %s", filename.string());
-        return errno;
-    }
-
-    r.file = filename;
-    r.deleted = false;
-    r.s.modTime_sec = st.st_mtime;
-    r.s.modTime_nsec = 0; // workaround sim breakage
-    //r.s.modTime_nsec = st.st_mtime_nsec;
-    r.s.mode = st.st_mode;
-    r.s.size = st.st_size;
-    r.s.crc32 = crc;
-
-    m_files.add(key, r);
-
-    return NO_ERROR;
-}
-
-status_t
-RestoreHelperBase::WriteSnapshot(int fd)
-{
-    return write_snapshot_file(fd, m_files);;
-}
-
-#if TEST_BACKUP_HELPERS
-
-#define SCRATCH_DIR "/data/backup_helper_test/"
-
-static int
-write_text_file(const char* path, const char* data)
-{
-    int amt;
-    int fd;
-    int len;
-
-    fd = creat(path, 0666);
-    if (fd == -1) {
-        fprintf(stderr, "creat %s failed\n", path);
-        return errno;
-    }
-
-    len = strlen(data);
-    amt = write(fd, data, len);
-    if (amt != len) {
-        fprintf(stderr, "error (%s) writing to file %s\n", strerror(errno), path);
-        return errno;
-    }
-
-    close(fd);
-
-    return 0;
-}
-
-static int
-compare_file(const char* path, const unsigned char* data, int len)
-{
-    int fd;
-    int amt;
-
-    fd = open(path, O_RDONLY);
-    if (fd == -1) {
-        fprintf(stderr, "compare_file error (%s) opening %s\n", strerror(errno), path);
-        return errno;
-    }
-
-    unsigned char* contents = (unsigned char*)malloc(len);
-    if (contents == NULL) {
-        fprintf(stderr, "malloc(%d) failed\n", len);
-        return ENOMEM;
-    }
-
-    bool sizesMatch = true;
-    amt = lseek(fd, 0, SEEK_END);
-    if (amt != len) {
-        fprintf(stderr, "compare_file file length should be %d, was %d\n", len, amt);
-        sizesMatch = false;
-    }
-    lseek(fd, 0, SEEK_SET);
-
-    int readLen = amt < len ? amt : len;
-    amt = read(fd, contents, readLen);
-    if (amt != readLen) {
-        fprintf(stderr, "compare_file read expected %d bytes but got %d\n", len, amt);
-    }
-
-    bool contentsMatch = true;
-    for (int i=0; i<readLen; i++) {
-        if (data[i] != contents[i]) {
-            if (contentsMatch) {
-                fprintf(stderr, "compare_file contents are different: (index, expected, actual)\n");
-                contentsMatch = false;
-            }
-            fprintf(stderr, "  [%-2d] %02x %02x\n", i, data[i], contents[i]);
-        }
-    }
-
-    free(contents);
-    return contentsMatch && sizesMatch ? 0 : 1;
-}
-
-int
-backup_helper_test_empty()
-{
-    int err;
-    int fd;
-    KeyedVector<String8,FileRec> snapshot;
-    const char* filename = SCRATCH_DIR "backup_helper_test_empty.snap";
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-
-    // write
-    fd = creat(filename, 0666);
-    if (fd == -1) {
-        fprintf(stderr, "error creating %s\n", filename);
-        return 1;
-    }
-
-    err = write_snapshot_file(fd, snapshot);
-
-    close(fd);
-
-    if (err != 0) {
-        fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
-        return err;
-    }
-
-    static const unsigned char correct_data[] = {
-        0x53, 0x6e, 0x61, 0x70,  0x00, 0x00, 0x00, 0x00,
-        0x46, 0x69, 0x6c, 0x65,  0x10, 0x00, 0x00, 0x00
-    };
-
-    err = compare_file(filename, correct_data, sizeof(correct_data));
-    if (err != 0) {
-        return err;
-    }
-
-    // read
-    fd = open(filename, O_RDONLY);
-    if (fd == -1) {
-        fprintf(stderr, "error opening for read %s\n", filename);
-        return 1;
-    }
-
-    KeyedVector<String8,FileState> readSnapshot;
-    err = read_snapshot_file(fd, &readSnapshot);
-    if (err != 0) {
-        fprintf(stderr, "read_snapshot_file failed %d\n", err);
-        return err;
-    }
-
-    if (readSnapshot.size() != 0) {
-        fprintf(stderr, "readSnapshot should be length 0\n");
-        return 1;
-    }
-
-    return 0;
-}
-
-int
-backup_helper_test_four()
-{
-    int err;
-    int fd;
-    KeyedVector<String8,FileRec> snapshot;
-    const char* filename = SCRATCH_DIR "backup_helper_test_four.snap";
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-
-    // write
-    fd = creat(filename, 0666);
-    if (fd == -1) {
-        fprintf(stderr, "error opening %s\n", filename);
-        return 1;
-    }
-
-    String8 filenames[4];
-    FileState states[4];
-    FileRec r;
-    r.deleted = false;
-
-    states[0].modTime_sec = 0xfedcba98;
-    states[0].modTime_nsec = 0xdeadbeef;
-    states[0].mode = 0777; // decimal 511, hex 0x000001ff
-    states[0].size = 0xababbcbc;
-    states[0].crc32 = 0x12345678;
-    states[0].nameLen = -12;
-    r.s = states[0];
-    filenames[0] = String8("bytes_of_padding");
-    snapshot.add(filenames[0], r);
-
-    states[1].modTime_sec = 0x93400031;
-    states[1].modTime_nsec = 0xdeadbeef;
-    states[1].mode = 0666; // decimal 438, hex 0x000001b6
-    states[1].size = 0x88557766;
-    states[1].crc32 = 0x22334422;
-    states[1].nameLen = -1;
-    r.s = states[1];
-    filenames[1] = String8("bytes_of_padding3");
-    snapshot.add(filenames[1], r);
-
-    states[2].modTime_sec = 0x33221144;
-    states[2].modTime_nsec = 0xdeadbeef;
-    states[2].mode = 0744; // decimal 484, hex 0x000001e4
-    states[2].size = 0x11223344;
-    states[2].crc32 = 0x01122334;
-    states[2].nameLen = 0;
-    r.s = states[2];
-    filenames[2] = String8("bytes_of_padding_2");
-    snapshot.add(filenames[2], r);
-
-    states[3].modTime_sec = 0x33221144;
-    states[3].modTime_nsec = 0xdeadbeef;
-    states[3].mode = 0755; // decimal 493, hex 0x000001ed
-    states[3].size = 0x11223344;
-    states[3].crc32 = 0x01122334;
-    states[3].nameLen = 0;
-    r.s = states[3];
-    filenames[3] = String8("bytes_of_padding__1");
-    snapshot.add(filenames[3], r);
-
-    err = write_snapshot_file(fd, snapshot);
-
-    close(fd);
-
-    if (err != 0) {
-        fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
-        return err;
-    }
-
-    static const unsigned char correct_data[] = {
-        // header
-        0x53, 0x6e, 0x61, 0x70,  0x04, 0x00, 0x00, 0x00,
-        0x46, 0x69, 0x6c, 0x65,  0xbc, 0x00, 0x00, 0x00,
-
-        // bytes_of_padding
-        0x98, 0xba, 0xdc, 0xfe,  0xef, 0xbe, 0xad, 0xde,
-        0xff, 0x01, 0x00, 0x00,  0xbc, 0xbc, 0xab, 0xab,
-        0x78, 0x56, 0x34, 0x12,  0x10, 0x00, 0x00, 0x00,
-        0x62, 0x79, 0x74, 0x65,  0x73, 0x5f, 0x6f, 0x66,
-        0x5f, 0x70, 0x61, 0x64,  0x64, 0x69, 0x6e, 0x67,
-
-        // bytes_of_padding3
-        0x31, 0x00, 0x40, 0x93,  0xef, 0xbe, 0xad, 0xde,
-        0xb6, 0x01, 0x00, 0x00,  0x66, 0x77, 0x55, 0x88,
-        0x22, 0x44, 0x33, 0x22,  0x11, 0x00, 0x00, 0x00,
-        0x62, 0x79, 0x74, 0x65,  0x73, 0x5f, 0x6f, 0x66,
-        0x5f, 0x70, 0x61, 0x64,  0x64, 0x69, 0x6e, 0x67,
-        0x33, 0xab, 0xab, 0xab,
-
-        // bytes of padding2
-        0x44, 0x11, 0x22, 0x33,  0xef, 0xbe, 0xad, 0xde,
-        0xe4, 0x01, 0x00, 0x00,  0x44, 0x33, 0x22, 0x11,
-        0x34, 0x23, 0x12, 0x01,  0x12, 0x00, 0x00, 0x00,
-        0x62, 0x79, 0x74, 0x65,  0x73, 0x5f, 0x6f, 0x66,
-        0x5f, 0x70, 0x61, 0x64,  0x64, 0x69, 0x6e, 0x67,
-        0x5f, 0x32, 0xab, 0xab,
-
-        // bytes of padding3
-        0x44, 0x11, 0x22, 0x33,  0xef, 0xbe, 0xad, 0xde,
-        0xed, 0x01, 0x00, 0x00,  0x44, 0x33, 0x22, 0x11,
-        0x34, 0x23, 0x12, 0x01,  0x13, 0x00, 0x00, 0x00,
-        0x62, 0x79, 0x74, 0x65,  0x73, 0x5f, 0x6f, 0x66,
-        0x5f, 0x70, 0x61, 0x64,  0x64, 0x69, 0x6e, 0x67,
-        0x5f, 0x5f, 0x31, 0xab
-    };
-
-    err = compare_file(filename, correct_data, sizeof(correct_data));
-    if (err != 0) {
-        return err;
-    }
-
-    // read
-    fd = open(filename, O_RDONLY);
-    if (fd == -1) {
-        fprintf(stderr, "error opening for read %s\n", filename);
-        return 1;
-    }
-
-
-    KeyedVector<String8,FileState> readSnapshot;
-    err = read_snapshot_file(fd, &readSnapshot);
-    if (err != 0) {
-        fprintf(stderr, "read_snapshot_file failed %d\n", err);
-        return err;
-    }
-
-    if (readSnapshot.size() != 4) {
-        fprintf(stderr, "readSnapshot should be length 4 is %d\n", readSnapshot.size());
-        return 1;
-    }
-
-    bool matched = true;
-    for (size_t i=0; i<readSnapshot.size(); i++) {
-        const String8& name = readSnapshot.keyAt(i);
-        const FileState state = readSnapshot.valueAt(i);
-
-        if (name != filenames[i] || states[i].modTime_sec != state.modTime_sec
-                || states[i].modTime_nsec != state.modTime_nsec || states[i].mode != state.mode
-                || states[i].size != state.size || states[i].crc32 != states[i].crc32) {
-            fprintf(stderr, "state %d expected={%d/%d, 0x%08x, %04o, 0x%08x, %3d} '%s'\n"
-                            "          actual={%d/%d, 0x%08x, %04o, 0x%08x, %3d} '%s'\n", i,
-                    states[i].modTime_sec, states[i].modTime_nsec, states[i].mode, states[i].size,
-                    states[i].crc32, name.length(), filenames[i].string(),
-                    state.modTime_sec, state.modTime_nsec, state.mode, state.size, state.crc32,
-                    state.nameLen, name.string());
-            matched = false;
-        }
-    }
-
-    return matched ? 0 : 1;
-}
-
-// hexdump -v -e '"    " 8/1 " 0x%02x," "\n"' data_writer.data
-const unsigned char DATA_GOLDEN_FILE[] = {
-     0x44, 0x61, 0x74, 0x61, 0x0b, 0x00, 0x00, 0x00,
-     0x0c, 0x00, 0x00, 0x00, 0x6e, 0x6f, 0x5f, 0x70,
-     0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x5f, 0x00,
-     0x6e, 0x6f, 0x5f, 0x70, 0x61, 0x64, 0x64, 0x69,
-     0x6e, 0x67, 0x5f, 0x00, 0x44, 0x61, 0x74, 0x61,
-     0x0c, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x00, 0x00,
-     0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
-     0x6f, 0x5f, 0x5f, 0x33, 0x00, 0xbc, 0xbc, 0xbc,
-     0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
-     0x6f, 0x5f, 0x5f, 0x33, 0x00, 0xbc, 0xbc, 0xbc,
-     0x44, 0x61, 0x74, 0x61, 0x0d, 0x00, 0x00, 0x00,
-     0x0e, 0x00, 0x00, 0x00, 0x70, 0x61, 0x64, 0x64,
-     0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x32, 0x5f,
-     0x5f, 0x00, 0xbc, 0xbc, 0x70, 0x61, 0x64, 0x64,
-     0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x32, 0x5f,
-     0x5f, 0x00, 0xbc, 0xbc, 0x44, 0x61, 0x74, 0x61,
-     0x0a, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00,
-     0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
-     0x6f, 0x31, 0x00, 0xbc, 0x70, 0x61, 0x64, 0x64,
-     0x65, 0x64, 0x5f, 0x74, 0x6f, 0x31, 0x00
-
-};
-const int DATA_GOLDEN_FILE_SIZE = sizeof(DATA_GOLDEN_FILE);
-
-static int
-test_write_header_and_entity(BackupDataWriter& writer, const char* str)
-{
-    int err;
-    String8 text(str);
-
-    err = writer.WriteEntityHeader(text, text.length()+1);
-    if (err != 0) {
-        fprintf(stderr, "WriteEntityHeader failed with %s\n", strerror(err));
-        return err;
-    }
-
-    err = writer.WriteEntityData(text.string(), text.length()+1);
-    if (err != 0) {
-        fprintf(stderr, "write failed for data '%s'\n", text.string());
-        return errno;
-    }
-
-    return err;
-}
-
-int
-backup_helper_test_data_writer()
-{
-    int err;
-    int fd;
-    const char* filename = SCRATCH_DIR "data_writer.data";
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-    mkdir(SCRATCH_DIR "data", 0777);
-
-    fd = creat(filename, 0666);
-    if (fd == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    BackupDataWriter writer(fd);
-
-    err = 0;
-    err |= test_write_header_and_entity(writer, "no_padding_");
-    err |= test_write_header_and_entity(writer, "padded_to__3");
-    err |= test_write_header_and_entity(writer, "padded_to_2__");
-    err |= test_write_header_and_entity(writer, "padded_to1");
-
-    close(fd);
-
-    err = compare_file(filename, DATA_GOLDEN_FILE, DATA_GOLDEN_FILE_SIZE);
-    if (err != 0) {
-        return err;
-    }
-
-    return err;
-}
-
-int
-test_read_header_and_entity(BackupDataReader& reader, const char* str)
-{
-    int err;
-    int bufSize = strlen(str)+1;
-    char* buf = (char*)malloc(bufSize);
-    String8 string;
-    int cookie = 0x11111111;
-    size_t actualSize;
-    bool done;
-    int type;
-    ssize_t nRead;
-
-    // printf("\n\n---------- test_read_header_and_entity -- %s\n\n", str);
-
-    err = reader.ReadNextHeader(&done, &type);
-    if (done) {
-        fprintf(stderr, "should not be done yet\n");
-        goto finished;
-    }
-    if (err != 0) {
-        fprintf(stderr, "ReadNextHeader (for app header) failed with %s\n", strerror(err));
-        goto finished;
-    }
-    if (type != BACKUP_HEADER_ENTITY_V1) {
-        err = EINVAL;
-        fprintf(stderr, "type=0x%08x expected 0x%08x\n", type, BACKUP_HEADER_ENTITY_V1);
-    }
-
-    err = reader.ReadEntityHeader(&string, &actualSize);
-    if (err != 0) {
-        fprintf(stderr, "ReadEntityHeader failed with %s\n", strerror(err));
-        goto finished;
-    }
-    if (string != str) {
-        fprintf(stderr, "ReadEntityHeader expected key '%s' got '%s'\n", str, string.string());
-        err = EINVAL;
-        goto finished;
-    }
-    if ((int)actualSize != bufSize) {
-        fprintf(stderr, "ReadEntityHeader expected dataSize 0x%08x got 0x%08x\n", bufSize,
-                actualSize);
-        err = EINVAL;
-        goto finished;
-    }
-
-    nRead = reader.ReadEntityData(buf, bufSize);
-    if (nRead < 0) {
-        err = reader.Status();
-        fprintf(stderr, "ReadEntityData failed with %s\n", strerror(err));
-        goto finished;
-    }
-
-    if (0 != memcmp(buf, str, bufSize)) {
-        fprintf(stderr, "ReadEntityData expected '%s' but got something starting with "
-                "%02x %02x %02x %02x  '%c%c%c%c'\n", str, buf[0], buf[1], buf[2], buf[3],
-                buf[0], buf[1], buf[2], buf[3]);
-        err = EINVAL;
-        goto finished;
-    }
-
-    // The next read will confirm whether it got the right amount of data.
-
-finished:
-    if (err != NO_ERROR) {
-        fprintf(stderr, "test_read_header_and_entity failed with %s\n", strerror(err));
-    }
-    free(buf);
-    return err;
-}
-
-int
-backup_helper_test_data_reader()
-{
-    int err;
-    int fd;
-    const char* filename = SCRATCH_DIR "data_reader.data";
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-    mkdir(SCRATCH_DIR "data", 0777);
-
-    fd = creat(filename, 0666);
-    if (fd == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    err = write(fd, DATA_GOLDEN_FILE, DATA_GOLDEN_FILE_SIZE);
-    if (err != DATA_GOLDEN_FILE_SIZE) {
-        fprintf(stderr, "Error \"%s\" writing golden file %s\n", strerror(errno), filename);
-        return errno;
-    }
-
-    close(fd);
-
-    fd = open(filename, O_RDONLY);
-    if (fd == -1) {
-        fprintf(stderr, "Error \"%s\" opening golden file %s for read\n", strerror(errno),
-                filename);
-        return errno;
-    }
-
-    {
-        BackupDataReader reader(fd);
-
-        err = 0;
-
-        if (err == NO_ERROR) {
-            err = test_read_header_and_entity(reader, "no_padding_");
-        }
-
-        if (err == NO_ERROR) {
-            err = test_read_header_and_entity(reader, "padded_to__3");
-        }
-
-        if (err == NO_ERROR) {
-            err = test_read_header_and_entity(reader, "padded_to_2__");
-        }
-
-        if (err == NO_ERROR) {
-            err = test_read_header_and_entity(reader, "padded_to1");
-        }
-    }
-
-    close(fd);
-
-    return err;
-}
-
-static int
-get_mod_time(const char* filename, struct timeval times[2])
-{
-    int err;
-    struct stat64 st;
-    err = stat64(filename, &st);
-    if (err != 0) {
-        fprintf(stderr, "stat '%s' failed: %s\n", filename, strerror(errno));
-        return errno;
-    }
-    times[0].tv_sec = st.st_atime;
-    times[1].tv_sec = st.st_mtime;
-
-    // If st_atime is a macro then struct stat64 uses struct timespec
-    // to store the access and modif time values and typically
-    // st_*time_nsec is not defined. In glibc, this is controlled by
-    // __USE_MISC.
-#ifdef __USE_MISC
-#if !defined(st_atime) || defined(st_atime_nsec)
-#error "Check if this __USE_MISC conditional is still needed."
-#endif
-    times[0].tv_usec = st.st_atim.tv_nsec / 1000;
-    times[1].tv_usec = st.st_mtim.tv_nsec / 1000;
-#else
-    times[0].tv_usec = st.st_atime_nsec / 1000;
-    times[1].tv_usec = st.st_mtime_nsec / 1000;
-#endif
-
-    return 0;
-}
-
-int
-backup_helper_test_files()
-{
-    int err;
-    int oldSnapshotFD;
-    int dataStreamFD;
-    int newSnapshotFD;
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-    mkdir(SCRATCH_DIR "data", 0777);
-
-    write_text_file(SCRATCH_DIR "data/b", "b\nbb\n");
-    write_text_file(SCRATCH_DIR "data/c", "c\ncc\n");
-    write_text_file(SCRATCH_DIR "data/d", "d\ndd\n");
-    write_text_file(SCRATCH_DIR "data/e", "e\nee\n");
-    write_text_file(SCRATCH_DIR "data/f", "f\nff\n");
-    write_text_file(SCRATCH_DIR "data/h", "h\nhh\n");
-
-    char const* files_before[] = {
-        SCRATCH_DIR "data/b",
-        SCRATCH_DIR "data/c",
-        SCRATCH_DIR "data/d",
-        SCRATCH_DIR "data/e",
-        SCRATCH_DIR "data/f"
-    };
-
-    char const* keys_before[] = {
-        "data/b",
-        "data/c",
-        "data/d",
-        "data/e",
-        "data/f"
-    };
-
-    dataStreamFD = creat(SCRATCH_DIR "1.data", 0666);
-    if (dataStreamFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    newSnapshotFD = creat(SCRATCH_DIR "before.snap", 0666);
-    if (newSnapshotFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    {
-        BackupDataWriter dataStream(dataStreamFD);
-
-        err = back_up_files(-1, &dataStream, newSnapshotFD, files_before, keys_before, 5);
-        if (err != 0) {
-            return err;
-        }
-    }
-
-    close(dataStreamFD);
-    close(newSnapshotFD);
-
-    sleep(3);
-
-    struct timeval d_times[2];
-    struct timeval e_times[2];
-
-    err = get_mod_time(SCRATCH_DIR "data/d", d_times);
-    err |= get_mod_time(SCRATCH_DIR "data/e", e_times);
-    if (err != 0) {
-        return err;
-    }
-
-    write_text_file(SCRATCH_DIR "data/a", "a\naa\n");
-    unlink(SCRATCH_DIR "data/c");
-    write_text_file(SCRATCH_DIR "data/c", "c\ncc\n");
-    write_text_file(SCRATCH_DIR "data/d", "dd\ndd\n");
-    utimes(SCRATCH_DIR "data/d", d_times);
-    write_text_file(SCRATCH_DIR "data/e", "z\nzz\n");
-    utimes(SCRATCH_DIR "data/e", e_times);
-    write_text_file(SCRATCH_DIR "data/g", "g\ngg\n");
-    unlink(SCRATCH_DIR "data/f");
-
-    char const* files_after[] = {
-        SCRATCH_DIR "data/a", // added
-        SCRATCH_DIR "data/b", // same
-        SCRATCH_DIR "data/c", // different mod time
-        SCRATCH_DIR "data/d", // different size (same mod time)
-        SCRATCH_DIR "data/e", // different contents (same mod time, same size)
-        SCRATCH_DIR "data/g"  // added
-    };
-
-    char const* keys_after[] = {
-        "data/a", // added
-        "data/b", // same
-        "data/c", // different mod time
-        "data/d", // different size (same mod time)
-        "data/e", // different contents (same mod time, same size)
-        "data/g"  // added
-    };
-
-    oldSnapshotFD = open(SCRATCH_DIR "before.snap", O_RDONLY);
-    if (oldSnapshotFD == -1) {
-        fprintf(stderr, "error opening: %s\n", strerror(errno));
-        return errno;
-    }
-
-    dataStreamFD = creat(SCRATCH_DIR "2.data", 0666);
-    if (dataStreamFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    newSnapshotFD = creat(SCRATCH_DIR "after.snap", 0666);
-    if (newSnapshotFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    {
-        BackupDataWriter dataStream(dataStreamFD);
-
-        err = back_up_files(oldSnapshotFD, &dataStream, newSnapshotFD, files_after, keys_after, 6);
-        if (err != 0) {
-            return err;
-        }
-}
-
-    close(oldSnapshotFD);
-    close(dataStreamFD);
-    close(newSnapshotFD);
-
-    return 0;
-}
-
-int
-backup_helper_test_null_base()
-{
-    int err;
-    int oldSnapshotFD;
-    int dataStreamFD;
-    int newSnapshotFD;
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-    mkdir(SCRATCH_DIR "data", 0777);
-
-    write_text_file(SCRATCH_DIR "data/a", "a\naa\n");
-
-    char const* files[] = {
-        SCRATCH_DIR "data/a",
-    };
-
-    char const* keys[] = {
-        "a",
-    };
-
-    dataStreamFD = creat(SCRATCH_DIR "null_base.data", 0666);
-    if (dataStreamFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    newSnapshotFD = creat(SCRATCH_DIR "null_base.snap", 0666);
-    if (newSnapshotFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    {
-        BackupDataWriter dataStream(dataStreamFD);
-
-        err = back_up_files(-1, &dataStream, newSnapshotFD, files, keys, 1);
-        if (err != 0) {
-            return err;
-        }
-    }
-
-    close(dataStreamFD);
-    close(newSnapshotFD);
-
-    return 0;
-}
-
-int
-backup_helper_test_missing_file()
-{
-    int err;
-    int oldSnapshotFD;
-    int dataStreamFD;
-    int newSnapshotFD;
-
-    system("rm -r " SCRATCH_DIR);
-    mkdir(SCRATCH_DIR, 0777);
-    mkdir(SCRATCH_DIR "data", 0777);
-
-    write_text_file(SCRATCH_DIR "data/b", "b\nbb\n");
-
-    char const* files[] = {
-        SCRATCH_DIR "data/a",
-        SCRATCH_DIR "data/b",
-        SCRATCH_DIR "data/c",
-    };
-
-    char const* keys[] = {
-        "a",
-        "b",
-        "c",
-    };
-
-    dataStreamFD = creat(SCRATCH_DIR "null_base.data", 0666);
-    if (dataStreamFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    newSnapshotFD = creat(SCRATCH_DIR "null_base.snap", 0666);
-    if (newSnapshotFD == -1) {
-        fprintf(stderr, "error creating: %s\n", strerror(errno));
-        return errno;
-    }
-
-    {
-        BackupDataWriter dataStream(dataStreamFD);
-
-        err = back_up_files(-1, &dataStream, newSnapshotFD, files, keys, 1);
-        if (err != 0) {
-            return err;
-        }
-    }
-
-    close(dataStreamFD);
-    close(newSnapshotFD);
-
-    return 0;
-}
-
-
-#endif // TEST_BACKUP_HELPERS
-
-}
-- 
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