bug fixing on chunk edges, added optional debug

extract_images_tiff.php

@@ -32,9 +32,8 @@ Found problem - does not process files that start in one file and end in another
    define('MIN_JP_LEN',     0x500);               // skip from jpeg looking for end marker
    define('MAX_IMG_LEN',    0x1000000);           // maximal image size (16M) to look for the end marker
    define('REQUIRE_EXIF',   1);                   // JPEG/JP4 must have Exif (more filtering, less false positives)
-   //define('DEBUG_LEVEL',    3);                 // Generate debug output
+   define('DEBUG_LEVEL',    0); //3);                 // Generate debug output
    //define('DEBUG_OUT_FILES',DEBUG_LEVEL? 1 : 0 ); // 1 to add sequence number to result image names (make all unique)
-   define('DEBUG_LEVEL',    1);                   // Generate debug output
    define('DEBUG_OUT_FILES',DEBUG_LEVEL? 0 : 0 ); // 1 to add sequence number to result image names (make all unique)
    //disable the default time limit for php scripts.
 set_time_limit(0);
@@ -270,6 +269,9 @@ function split_file($path, $file, $destination, $add_to_chn = - 1, $next_file =
                 }
             }
             fseek($f, $markers[$i]);
+            if ((DEBUG_LEVEL >= 1)) {
+                printf("marker: %6d, position 0x%x\n",$i,$markers[$i]);
+            }
             $s = fread($f, $markers[$i + 1] - $markers[$i]);
             if ((DEBUG_LEVEL >= 2)) {
                 if (($i == (count($markers) - 2)) || ($i == 0)) {
@@ -313,6 +315,17 @@ function split_file($path, $file, $destination, $add_to_chn = - 1, $next_file =
                 }
                 
             } else if ($file_type == 1) { // Tiff
+            // read continuation if needed
+            //$s = fread($f, $markers[$i + 1] - $markers[$i]);
+                if ((strlen($s) < $markers[$i + 1] - $markers[$i]) && $next_path) {
+                    $f1 = fopen($next_path, "r");
+                    $s .= fread($f1, $markers[$i + 1] - $markers[$i] - strlen($s)); // beginning of the next file
+                    fclose($f1);
+                    if (DEBUG_LEVEL >= 0) {
+                        printf("Got continuation of the image from the next file %s\n", $next_path);
+                    }
+                }
+            
                 // file_put_contents($tmp_name,$s);
                 file_put_contents($tmp_name, substr($s, 0, MAX_HEAD_LEN)); // only save beginning of the file
                                                                            // printf ("header length = %d\n", strlen(substr($s, 0, MAX_HEAD_LEN)));
@@ -328,7 +341,7 @@ function split_file($path, $file, $destination, $add_to_chn = - 1, $next_file =
                 }
                 // rename($tmp_name, $dest_image); // "$path/$destination/$result_name");
                 file_put_contents($dest_image, substr($s, 0, $image_length));
-                if ((DEBUG_LEVEL >= 2)) {
+                if (DEBUG_LEVEL >= 2) {
                     if ($i == 0) {
                         file_put_contents($dest_image . ".test", substr($s, 0, $image_length));
                         printf("2.First image[%d] from img file - %s, length=0x%08x(%d), strlen(s)=%d (%d)\n", $i, $dest_image, $image_length, $image_length, strlen($s), strlen(substr($s, 0, $image_length)));