From 0763626b1d5a396a8d78985c9a445763686f92f8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <mail@daniel-baumann.ch>
Date: Sat, 7 Nov 2015 12:45:50 +0100
Subject: Merging upstream version 1.16~pre2.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
---
 repair.cc | 88 ++++++++++++++++++++++++++++++++-------------------------------
 1 file changed, 45 insertions(+), 43 deletions(-)

(limited to 'repair.cc')

diff --git a/repair.cc b/repair.cc
index 92a417f..0048bcf 100644
--- a/repair.cc
+++ b/repair.cc
@@ -20,6 +20,7 @@
 #include <cerrno>
 #include <climits>
 #include <cstdio>
+#include <cstdlib>
 #include <cstring>
 #include <string>
 #include <vector>
@@ -29,15 +30,7 @@
 
 #include "lzip.h"
 #include "file_index.h"
-
-
-int seek_read( const int fd, uint8_t * const buf, const int size,
-               const long long pos )
-  {
-  if( lseek( fd, pos, SEEK_SET ) == pos )
-    return readblock( fd, buf, size );
-  return 0;
-  }
+#include "mtester.h"
 
 
 int seek_write( const int fd, const uint8_t * const buf, const int size,
@@ -63,7 +56,7 @@ int repair_file( const std::string & input_filename,
     { pp( file_index.error().c_str() ); return file_index.retval(); }
 
   int outfd = -1;
-  for( int i = 0; i < file_index.members(); ++i )
+  for( long i = 0; i < file_index.members(); ++i )
     {
     const long long mpos = file_index.mblock( i ).pos();
     const long long msize = file_index.mblock( i ).size();
@@ -76,50 +69,59 @@ int repair_file( const std::string & input_filename,
       { show_error( "Can't repair error in input file." );
         cleanup_and_fail( output_filename, outfd, 2 ); }
 
-    if( outfd < 0 )			// first damaged member found
+    if( verbosity >= 1 )		// damaged member found
       {
-      if( !safe_seek( infd, 0 ) ) return 1;
-      outfd = open_outstream_rw( output_filename, force );
-      if( outfd < 0 ) { close( infd ); return 1; }
-      if( !copy_file( infd, outfd ) )		// copy whole file
-        cleanup_and_fail( output_filename, outfd, 1 );
-      }
-
-    if( verbosity >= 1 )
-      {
-      std::printf( "Repairing member %d\n", i + 1 );
+      std::printf( "Repairing member %ld  (failure pos = %llu)\n",
+                   i + 1, mpos + failure_pos );
       std::fflush( stdout );
       }
-    const long long min_pos =
-      std::max( (long long)File_header::size, failure_pos - 1000 );
+    uint8_t * const mbuffer = read_member( infd, mpos, msize );
+    if( !mbuffer )
+      cleanup_and_fail( output_filename, outfd, 1 );
+    long pos = failure_pos;
     bool done = false;
-    for( long long pos = failure_pos; pos >= min_pos && !done ; --pos )
+    while( pos >= File_header::size && pos > failure_pos - 20000 && !done )
       {
-      if( verbosity >= 1 )
-        {
-        std::printf( "Trying position %llu \r", mpos + pos );
-        std::fflush( stdout );
-        }
-      uint8_t byte;
-      if( seek_read( outfd, &byte, 1, mpos + pos ) != 1 )
-        { show_error( "Error reading output file", errno );
-          cleanup_and_fail( output_filename, outfd, 1 ); }
-      for( int i = 0; i < 256; ++i )
+      const long min_pos = std::max( (long)File_header::size, pos - 1000 );
+      const LZ_mtester * master = prepare_master( mbuffer, msize, min_pos - 16 );
+      if( !master )
+        cleanup_and_fail( output_filename, outfd, 1 );
+      for( ; pos >= min_pos && !done ; --pos )
         {
-        ++byte;
-        if( seek_write( outfd, &byte, 1, mpos + pos ) != 1 ||
-            lseek( outfd, mpos, SEEK_SET ) < 0 )
-          { show_error( "Error writing output file", errno );
-            cleanup_and_fail( output_filename, outfd, 1 ); }
-        if( i == 255 ) break;
-        if( try_decompress_member( outfd, msize ) )
-          { done = true; break; }
+        if( verbosity >= 1 )
+          {
+          std::printf( "Trying position %llu \r", mpos + pos );
+          std::fflush( stdout );
+          }
+        for( int j = 0; j < 256; ++j )
+          {
+          ++mbuffer[pos];
+          if( j == 255 ) break;
+          if( test_member_rest( *master ) )
+            {
+            done = true;
+            if( outfd < 0 )		// first damaged member repaired
+              {
+              if( !safe_seek( infd, 0 ) ) return 1;
+              outfd = open_outstream_rw( output_filename, force );
+              if( outfd < 0 ) { close( infd ); return 1; }
+              if( !copy_file( infd, outfd ) )		// copy whole file
+                cleanup_and_fail( output_filename, outfd, 1 );
+              }
+            if( seek_write( outfd, mbuffer + pos, 1, mpos + pos ) != 1 )
+              { show_error( "Error writing output file", errno );
+                cleanup_and_fail( output_filename, outfd, 1 ); }
+            break;
+            }
+          }
         }
+      delete master;
       }
+    delete[] mbuffer;
     if( verbosity >= 1 ) std::printf( "\n" );
     if( !done )
       {
-      show_error( "Error is larger than 1 byte. Can't repair input file." );
+      show_error( "Can't repair input file. Error is probably larger than 1 byte." );
       cleanup_and_fail( output_filename, outfd, 2 );
       }
     }
-- 
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