<?php
/**
 * Copyright (c) 2021, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 *
 * Note: this class is from libavifinfo - https://aomedia.googlesource.com/libavifinfo/+/refs/heads/main/avifinfo.php at f509487.
 * It is used as a fallback to parse AVIF files when the server doesn't support AVIF,
 * primarily to identify the width and height of the image.
 *
 * Note PHP 8.2 added native support for AVIF, so this class can be removed when WordPress requires PHP 8.2.
 */

namespace Avifinfo;

const FOUND     = 0; // Input correctly parsed and information retrieved.
const NOT_FOUND = 1; // Input correctly parsed but information is missing or elsewhere.
const TRUNCATED = 2; // Input correctly parsed until missing bytes to continue.
const ABORTED   = 3; // Input correctly parsed until stopped to avoid timeout or crash.
const INVALID   = 4; // Input incorrectly parsed.

const MAX_SIZE      = 4294967295; // Unlikely to be insufficient to parse AVIF headers.
const MAX_NUM_BOXES = 4096;       // Be reasonable. Avoid timeouts and out-of-memory.
const MAX_VALUE     = 255;
const MAX_TILES     = 16;
const MAX_PROPS     = 32;
const MAX_FEATURES  = 8;
const UNDEFINED     = 0;          // Value was not yet parsed.

/**
 * Reads an unsigned integer with most significant bits first.
 *
 * @param binary string $input     Must be at least $num_bytes-long.
 * @param int           $num_bytes Number of parsed bytes.
 * @return int                     Value.
 */
function read_big_endian( $input, $num_bytes ) {
  if ( $num_bytes == 1 ) {
    return unpack( 'C', $input ) [1];
  } else if ( $num_bytes == 2 ) {
    return unpack( 'n', $input ) [1];
  } else if ( $num_bytes == 3 ) {
    $bytes = unpack( 'C3', $input );
    return ( $bytes[1] << 16 ) | ( $bytes[2] << 8 ) | $bytes[3];
  } else { // $num_bytes is 4
    // This might fail to read unsigned values >= 2^31 on 32-bit systems.
    // See https://www.php.net/manual/en/function.unpack.php#106041
    return unpack( 'N', $input ) [1];
  }
}

/**
 * Reads bytes and advances the stream position by the same count.
 *
 * @param stream               $handle    Bytes will be read from this resource.
 * @param int                  $num_bytes Number of bytes read. Must be greater than 0.
 * @return binary string|false            The raw bytes or false on failure.
 */
function read( $handle, $num_bytes ) {
  $data = fread( $handle, $num_bytes );
  return ( $data !== false && strlen( $data ) >= $num_bytes ) ? $data : false;
}

/**
 * Advances the stream position by the given offset.
 *
 * @param stream $handle    Bytes will be skipped from this resource.
 * @param int    $num_bytes Number of skipped bytes. Can be 0.
 * @return bool             True on success or false on failure.
 */
// Skips 'num_bytes' from the 'stream'. 'num_bytes' can be zero.
function skip( $handle, $num_bytes ) {
  return ( fseek( $handle, $num_bytes, SEEK_CUR ) == 0 );
}

//------------------------------------------------------------------------------
// Features are parsed into temporary property associations.

class Tile { // Tile item id <-> parent item id associations.
  public $tile_item_id;
  public $parent_item_id;
}

class Prop { // Property index <-> item id associations.
  public $property_index;
  public $item_id;
}

class Dim_Prop { // Property <-> features associations.
  public $property_index;
  public $width;
  public $height;
}

class Chan_Prop { // Property <-> features associations.
  public $property_index;
  public $bit_depth;
  public $num_channels;
}

class Features {
  public $has_primary_item = false; // True if "pitm" was parsed.
  public $has_alpha = false; // True if an alpha "auxC" was parsed.
  public $primary_item_id;
  public $primary_item_features = array( // Deduced from the data below.
    'width'        => UNDEFINED, // In number of pixels.
    'height'       => UNDEFINED, // Ignores mirror and rotation.
    'bit_depth'    => UNDEFINED, // Likely 8, 10 or 12 bits per channel per pixel.
    'num_channels' => UNDEFINED  // Likely 1, 2, 3 or 4 channels:
                                          //   (1 monochrome or 3 colors) + (0 or 1 alpha)
  );

  public $tiles = array(); // Tile[]
  public $props = array(); // Prop[]
  public $dim_props = array(); // Dim_Prop[]
  public $chan_props = array(); // Chan_Prop[]

  /**
   * Binds the width, height, bit depth and number of channels from stored internal features.
   *
   * @param int     $target_item_id Id of the item whose features will be bound.
   * @param int     $tile_depth     Maximum recursion to search within tile-parent relations.
   * @return Status                 FOUND on success or NOT_FOUND on failure.
   */
  private function get_item_features( $target_item_id, $tile_depth ) {
    foreach ( $this->props as $prop ) {
      if ( $prop->item_id != $target_item_id ) {
        continue;
      }

      // Retrieve the width and height of the primary item if not already done.
      if ( $target_item_id == $this->primary_item_id &&
           ( $this->primary_item_features['width'] == UNDEFINED ||
             $this->primary_item_features['height'] == UNDEFINED ) ) {
        foreach ( $this->dim_props as $dim_prop ) {
          if ( $dim_prop->property_index != $prop->property_index ) {
            continue;
          }
          $this->primary_item_features['width']  = $dim_prop->width;
          $this->primary_item_features['height'] = $dim_prop->height;
          if ( $this->primary_item_features['bit_depth'] != UNDEFINED &&
               $this->primary_item_features['num_channels'] != UNDEFINED ) {
            return FOUND;
          }
          break;
        }
      }
      // Retrieve the bit depth and number of channels of the target item if not
      // already done.
      if ( $this->primary_item_features['bit_depth'] == UNDEFINED ||
           $this->primary_item_features['num_channels'] == UNDEFINED ) {
        foreach ( $this->chan_props as $chan_prop ) {
          if ( $chan_prop->property_index != $prop->property_index ) {
            continue;
          }
          $this->primary_item_features['bit_depth']    = $chan_prop->bit_depth;
          $this->primary_item_features['num_channels'] = $chan_prop->num_channels;
          if ( $this->primary_item_features['width'] != UNDEFINED &&
              $this->primary_item_features['height'] != UNDEFINED ) {
            return FOUND;
          }
          break;
        }
      }
    }

    // Check for the bit_depth and num_channels in a tile if not yet found.
    if ( $tile_depth < 3 ) {
      foreach ( $this->tiles as $tile ) {
        if ( $tile->parent_item_id != $target_item_id ) {
          continue;
        }
        $status = $this->get_item_features( $tile->tile_item_id, $tile_depth + 1 );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      }
    }
    return NOT_FOUND;
  }

  /**
   * Finds the width, height, bit depth and number of channels of the primary item.
   *
   * @return Status FOUND on success or NOT_FOUND on failure.
   */
  public function get_primary_item_features() {
    // Nothing to do without the primary item ID.
    if ( !$this->has_primary_item ) {
      return NOT_FOUND;
    }
    // Early exit.
    if ( empty( $this->dim_props ) || empty( $this->chan_props ) ) {
      return NOT_FOUND;
    }
    $status = $this->get_item_features( $this->primary_item_id, /*tile_depth=*/ 0 );
    if ( $status != FOUND ) {
      return $status;
    }

    // "auxC" is parsed before the "ipma" properties so it is known now, if any.
    if ( $this->has_alpha ) {
      ++$this->primary_item_features['num_channels'];
    }
    return FOUND;
  }
}

//------------------------------------------------------------------------------

class Box {
  public $size; // In bytes.
  public $type; // Four characters.
  public $version; // 0 or actual version if this is a full box.
  public $flags; // 0 or actual value if this is a full box.
  public $content_size; // 'size' minus the header size.

  /**
   * Reads the box header.
   *
   * @param stream  $handle              The resource the header will be parsed from.
   * @param int     $num_parsed_boxes    The total number of parsed boxes. Prevents timeouts.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  public function parse( $handle, &$num_parsed_boxes, $num_remaining_bytes = MAX_SIZE ) {
    // See ISO/IEC 14496-12:2012(E) 4.2
    $header_size = 8; // box 32b size + 32b type (at least)
    if ( $header_size > $num_remaining_bytes ) {
      return INVALID;
    }
    if ( !( $data = read( $handle, 8 ) ) ) {
      return TRUNCATED;
    }
    $this->size = read_big_endian( $data, 4 );
    $this->type = substr( $data, 4, 4 );
    // 'box->size==1' means 64-bit size should be read after the box type.
    // 'box->size==0' means this box extends to all remaining bytes.
    if ( $this->size == 1 ) {
      $header_size += 8;
      if ( $header_size > $num_remaining_bytes ) {
        return INVALID;
      }
      if ( !( $data = read( $handle, 8 ) ) ) {
        return TRUNCATED;
      }
      // Stop the parsing if any box has a size greater than 4GB.
      if ( read_big_endian( $data, 4 ) != 0 ) {
        return ABORTED;
      }
      // Read the 32 least-significant bits.
      $this->size = read_big_endian( substr( $data, 4, 4 ), 4 );
    } else if ( $this->size == 0 ) {
      $this->size = $num_remaining_bytes;
    }
    if ( $this->size < $header_size ) {
      return INVALID;
    }
    if ( $this->size > $num_remaining_bytes ) {
      return INVALID;
    }

    $has_fullbox_header = $this->type == 'meta' || $this->type == 'pitm' ||
                          $this->type == 'ipma' || $this->type == 'ispe' ||
                          $this->type == 'pixi' || $this->type == 'iref' ||
                          $this->type == 'auxC';
    if ( $has_fullbox_header ) {
      $header_size += 4;
    }
    if ( $this->size < $header_size ) {
      return INVALID;
    }
    $this->content_size = $this->size - $header_size;
    // Avoid timeouts. The maximum number of parsed boxes is arbitrary.
    ++$num_parsed_boxes;
    if ( $num_parsed_boxes >= MAX_NUM_BOXES ) {
      return ABORTED;
    }

    $this->version = 0;
    $this->flags   = 0;
    if ( $has_fullbox_header ) {
      if ( !( $data = read( $handle, 4 ) ) ) {
        return TRUNCATED;
      }
      $this->version = read_big_endian( $data, 1 );
      $this->flags   = read_big_endian( substr( $data, 1, 3 ), 3 );
      // See AV1 Image File Format (AVIF) 8.1
      // at https://aomediacodec.github.io/av1-avif/#avif-boxes (available when
      // https://github.com/AOMediaCodec/av1-avif/pull/170 is merged).
      $is_parsable = ( $this->type == 'meta' && $this->version <= 0 ) ||
                     ( $this->type == 'pitm' && $this->version <= 1 ) ||
                     ( $this->type == 'ipma' && $this->version <= 1 ) ||
                     ( $this->type == 'ispe' && $this->version <= 0 ) ||
                     ( $this->type == 'pixi' && $this->version <= 0 ) ||
                     ( $this->type == 'iref' && $this->version <= 1 ) ||
                     ( $this->type == 'auxC' && $this->version <= 0 );
      // Instead of considering this file as invalid, skip unparsable boxes.
      if ( !$is_parsable ) {
        $this->type = 'unknownversion';
      }
    }
    // print_r( $this ); // Uncomment to print all boxes.
    return FOUND;
  }
}

//------------------------------------------------------------------------------

class Parser {
  private $handle; // Input stream.
  private $num_parsed_boxes = 0;
  private $data_was_skipped = false;
  public $features;

  function __construct( $handle ) {
    $this->handle   = $handle;
    $this->features = new Features();
  }

  /**
   * Parses an "ipco" box.
   *
   * "ispe" is used for width and height, "pixi" and "av1C" are used for bit depth
   * and number of channels, and "auxC" is used for alpha.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_ipco( $num_remaining_bytes ) {
    $box_index = 1; // 1-based index. Used for iterating over properties.
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'ispe' ) {
        // See ISO/IEC 23008-12:2017(E) 6.5.3.2
        if ( $box->content_size < 8 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 8 ) ) ) {
          return TRUNCATED;
        }
        $width  = read_big_endian( substr( $data, 0, 4 ), 4 );
        $height = read_big_endian( substr( $data, 4, 4 ), 4 );
        if ( $width == 0 || $height == 0 ) {
          return INVALID;
        }
        if ( count( $this->features->dim_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE ) {
          $dim_prop_count = count( $this->features->dim_props );
          $this->features->dim_props[$dim_prop_count]                 = new Dim_Prop();
          $this->features->dim_props[$dim_prop_count]->property_index = $box_index;
          $this->features->dim_props[$dim_prop_count]->width          = $width;
          $this->features->dim_props[$dim_prop_count]->height         = $height;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - 8 ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'pixi' ) {
        // See ISO/IEC 23008-12:2017(E) 6.5.6.2
        if ( $box->content_size < 1 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 1 ) ) ) {
          return TRUNCATED;
        }
        $num_channels = read_big_endian( $data, 1 );
        if ( $num_channels < 1 ) {
          return INVALID;
        }
        if ( $box->content_size < 1 + $num_channels ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 1 ) ) ) {
          return TRUNCATED;
        }
        $bit_depth = read_big_endian( $data, 1 );
        if ( $bit_depth < 1 ) {
          return INVALID;
        }
        for ( $i = 1; $i < $num_channels; ++$i ) {
          if ( !( $data = read( $this->handle, 1 ) ) ) {
            return TRUNCATED;
          }
          // Bit depth should be the same for all channels.
          if ( read_big_endian( $data, 1 ) != $bit_depth ) {
            return INVALID;
          }
          if ( $i > 32 ) {
            return ABORTED; // Be reasonable.
          }
        }
        if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE && $bit_depth <= MAX_VALUE &&
             $num_channels <= MAX_VALUE ) {
          $chan_prop_count = count( $this->features->chan_props );
          $this->features->chan_props[$chan_prop_count]                 = new Chan_Prop();
          $this->features->chan_props[$chan_prop_count]->property_index = $box_index;
          $this->features->chan_props[$chan_prop_count]->bit_depth      = $bit_depth;
          $this->features->chan_props[$chan_prop_count]->num_channels   = $num_channels;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - ( 1 + $num_channels ) ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'av1C' ) {
        // See AV1 Codec ISO Media File Format Binding 2.3.1
        // at https://aomediacodec.github.io/av1-isobmff/#av1c
        // Only parse the necessary third byte. Assume that the others are valid.
        if ( $box->content_size < 3 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 3 ) ) ) {
          return TRUNCATED;
        }
        $byte          = read_big_endian( substr( $data, 2, 1 ), 1 );
        $high_bitdepth = ( $byte & 0x40 ) != 0;
        $twelve_bit    = ( $byte & 0x20 ) != 0;
        $monochrome    = ( $byte & 0x10 ) != 0;
        if ( $twelve_bit && !$high_bitdepth ) {
            return INVALID;
        }
        if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE ) {
          $chan_prop_count = count( $this->features->chan_props );
          $this->features->chan_props[$chan_prop_count]                 = new Chan_Prop();
          $this->features->chan_props[$chan_prop_count]->property_index = $box_index;
          $this->features->chan_props[$chan_prop_count]->bit_depth      =
              $high_bitdepth ? $twelve_bit ? 12 : 10 : 8;
          $this->features->chan_props[$chan_prop_count]->num_channels   = $monochrome ? 1 : 3;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - 3 ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'auxC' ) {
        // See AV1 Image File Format (AVIF) 4
        // at https://aomediacodec.github.io/av1-avif/#auxiliary-images
        $kAlphaStr       = "urn:mpeg:mpegB:cicp:systems:auxiliary:alpha\0";
        $kAlphaStrLength = 44; // Includes terminating character.
        if ( $box->content_size >= $kAlphaStrLength ) {
          if ( !( $data = read( $this->handle, $kAlphaStrLength ) ) ) {
            return TRUNCATED;
          }
          if ( substr( $data, 0, $kAlphaStrLength ) == $kAlphaStr ) {
            // Note: It is unlikely but it is possible that this alpha plane does
            //       not belong to the primary item or a tile. Ignore this issue.
            $this->features->has_alpha = true;
          }
          if ( !skip( $this->handle, $box->content_size - $kAlphaStrLength ) ) {
            return TRUNCATED;
          }
        } else {
          if ( !skip( $this->handle, $box->content_size ) ) {
            return TRUNCATED;
          }
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      ++$box_index;
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses an "iprp" box.
   *
   * The "ipco" box contain the properties which are linked to items by the "ipma" box.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_iprp( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'ipco' ) {
        $status = $this->parse_ipco( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else if ( $box->type == 'ipma' ) {
        // See ISO/IEC 23008-12:2017(E) 9.3.2
        $num_read_bytes = 4;
        if ( $box->content_size < $num_read_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {
          return TRUNCATED;
        }
        $entry_count        = read_big_endian( $data, 4 );
        $id_num_bytes       = ( $box->version < 1 ) ? 2 : 4;
        $index_num_bytes    = ( $box->flags & 1 ) ? 2 : 1;
        $essential_bit_mask = ( $box->flags & 1 ) ? 0x8000 : 0x80;

        for ( $entry = 0; $entry < $entry_count; ++$entry ) {
          if ( $entry >= MAX_PROPS ||
               count( $this->features->props ) >= MAX_PROPS ) {
            $this->data_was_skipped = true;
            break;
          }
          $num_read_bytes += $id_num_bytes + 1;
          if ( $box->content_size < $num_read_bytes ) {
            return INVALID;
          }
          if ( !( $data = read( $this->handle, $id_num_bytes + 1 ) ) ) {
            return TRUNCATED;
          }
          $item_id           = read_big_endian(
              substr( $data, 0, $id_num_bytes ), $id_num_bytes );
          $association_count = read_big_endian(
              substr( $data, $id_num_bytes, 1 ), 1 );

          for ( $property = 0; $property < $association_count; ++$property ) {
            if ( $property >= MAX_PROPS ||
                 count( $this->features->props ) >= MAX_PROPS ) {
              $this->data_was_skipped = true;
              break;
            }
            $num_read_bytes += $index_num_bytes;
            if ( $box->content_size < $num_read_bytes ) {
              return INVALID;
            }
            if ( !( $data = read( $this->handle, $index_num_bytes ) ) ) {
              return TRUNCATED;
            }
            $value          = read_big_endian( $data, $index_num_bytes );
            // $essential = ($value & $essential_bit_mask);  // Unused.
            $property_index = ( $value & ~$essential_bit_mask );
            if ( $property_index <= MAX_VALUE && $item_id <= MAX_VALUE ) {
              $prop_count = count( $this->features->props );
              $this->features->props[$prop_count]                 = new Prop();
              $this->features->props[$prop_count]->property_index = $property_index;
              $this->features->props[$prop_count]->item_id        = $item_id;
            } else {
              $this->data_was_skipped = true;
            }
          }
          if ( $property < $association_count ) {
            break; // Do not read garbage.
          }
        }

        // If all features are available now, do not look further.
        $status = $this->features->get_primary_item_features();
        if ( $status != NOT_FOUND ) {
          return $status;
        }

        // Mostly if 'data_was_skipped'.
        if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {
          return TRUNCATED;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses an "iref" box.
   *
   * The "dimg" boxes contain links between tiles and their parent items, which
   * can be used to infer bit depth and number of channels for the primary item
   * when the latter does not have these properties.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_iref( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'dimg' ) {
        // See ISO/IEC 14496-12:2015(E) 8.11.12.2
        $num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;
        $num_read_bytes   = $num_bytes_per_id + 2;
        if ( $box->content_size < $num_read_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {
          return TRUNCATED;
        }
        $from_item_id    = read_big_endian( $data, $num_bytes_per_id );
        $reference_count = read_big_endian( substr( $data, $num_bytes_per_id, 2 ), 2 );

        for ( $i = 0; $i < $reference_count; ++$i ) {
          if ( $i >= MAX_TILES ) {
            $this->data_was_skipped = true;
            break;
          }
          $num_read_bytes += $num_bytes_per_id;
          if ( $box->content_size < $num_read_bytes ) {
            return INVALID;
          }
          if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {
            return TRUNCATED;
          }
          $to_item_id = read_big_endian( $data, $num_bytes_per_id );
          $tile_count = count( $this->features->tiles );
          if ( $from_item_id <= MAX_VALUE && $to_item_id <= MAX_VALUE &&
               $tile_count < MAX_TILES ) {
            $this->features->tiles[$tile_count]                 = new Tile();
            $this->features->tiles[$tile_count]->tile_item_id   = $to_item_id;
            $this->features->tiles[$tile_count]->parent_item_id = $from_item_id;
          } else {
            $this->data_was_skipped = true;
          }
        }

        // If all features are available now, do not look further.
        $status = $this->features->get_primary_item_features();
        if ( $status != NOT_FOUND ) {
          return $status;
        }

        // Mostly if 'data_was_skipped'.
        if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {
          return TRUNCATED;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses a "meta" box.
   *
   * It looks for the primary item ID in the "pitm" box and recurses into other boxes
   * to find its features.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_meta( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'pitm' ) {
        // See ISO/IEC 14496-12:2015(E) 8.11.4.2
        $num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;
        if ( $num_bytes_per_id > $num_remaining_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {
          return TRUNCATED;
        }
        $primary_item_id = read_big_endian( $data, $num_bytes_per_id );
        if ( $primary_item_id > MAX_VALUE ) {
          return ABORTED;
        }
        $this->features->has_primary_item = true;
        $this->features->primary_item_id  = $primary_item_id;
        if ( !skip( $this->handle, $box->content_size - $num_bytes_per_id ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'iprp' ) {
        $status = $this->parse_iprp( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else if ( $box->type == 'iref' ) {
        $status = $this->parse_iref( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes != 0 );
    // According to ISO/IEC 14496-12:2012(E) 8.11.1.1 there is at most one "meta".
    return INVALID;
  }

  /**
   * Parses a file stream.
   *
   * The file type is checked through the "ftyp" box.
   *
   * @return bool True if the input stream is an AVIF bitstream or false.
   */
  public function parse_ftyp() {
    $box    = new Box();
    $status = $box->parse( $this->handle, $this->num_parsed_boxes );
    if ( $status != FOUND ) {
      return false;
    }

    if ( $box->type != 'ftyp' ) {
      return false;
    }
    // Iterate over brands. See ISO/IEC 14496-12:2012(E) 4.3.1
    if ( $box->content_size < 8 ) {
      return false;
    }
    for ( $i = 0; $i + 4 <= $box->content_size; $i += 4 ) {
      if ( !( $data = read( $this->handle, 4 ) ) ) {
        return false;
      }
      if ( $i == 4 ) {
        continue; // Skip minor_version.
      }
      if ( substr( $data, 0, 4 ) == 'avif' || substr( $data, 0, 4 ) == 'avis' ) {
        return skip( $this->handle, $box->content_size - ( $i + 4 ) );
      }
      if ( $i > 32 * 4 ) {
        return false; // Be reasonable.
      }

    }
    return false; // No AVIF brand no good.
  }

  /**
   * Parses a file stream.
   *
   * Features are extracted from the "meta" box.
   *
   * @return bool True if the main features of the primary item were parsed or false.
   */
  public function parse_file() {
    $box = new Box();
    while ( $box->parse( $this->handle, $this->num_parsed_boxes ) == FOUND ) {
      if ( $box->type === 'meta' ) {
        if ( $this->parse_meta( $box->content_size ) != FOUND ) {
          return false;
        }
        return true;
      }
      if ( !skip( $this->handle, $box->content_size ) ) {
        return false;
      }
    }
    return false; // No "meta" no good.
  }
}

Affy Pharma Pvt Ltd

Pharmaceutical, Nutra, Cosmetics Manufacturer in India

GENERIC MARKETING

AISLING Pharma

SYREGO

POWDER FOR ORAL SUSPENSION
30ML (HDPE BOTTLE)

Composition

Cefpodoxime 50mg/5ml <

Indications & Uses

UTIs, LRTs

SYREGO – CV

POWDER FOR ORAL SUSPENSION
30ML (GLASS BOTTLE)

Composition

Cefpodoxime 50mg + Potassium Clavulanate 31.25mg/ 5ml

Indications & Uses

Upper & lower respiratory infections, Uncomplicated skin infections, Urinary Tract Infections

AISIMOX – CLAV

POWDER FOR ORAL SUSPENSION
30ML (GLASS +HDPE BOTTLE)

Composition

Amoxycillin 200mg + Potassium clavulanate 28.50 mg/ 5ml

Indications & Uses

Community Acquired Pneumonia, Acute Exacerbations of Chronic Bronchitis, Upper Respiratory Tract Infections, Urinary Tract Infections

CEFTAR – CV

POWDER FOR ORAL SUSPENSION
30ML (GLASS BOTTLE)

Composition

Cefixime 50mg + Potassium clavulanate 31.25mg/5ml

Indications & Uses

Urinary Tract Inefctions, AECB, Otitis Media, Typhoid/p>

CEFTAR

POWDER FOR ORAL SUSPENSION
30ML (HDPE BOTTLE)

Composition

Cefixime 50mg/5ml

Indications & Uses

Urinary Tract Inefctions, Gastroenteritis

FADRO

ORAL SUSPENSION
15 ml

Composition

Azithromycin 200mg/5ml

Indications & Uses

Community Acquired Pneumonia, Acute Exacerbations of Chronic Bronchitis,

DOFLAM – DS

ORAL SUSPENSION
60 ml

Composition

Paracetamol 250mg/5ml

Indications & Uses

Fever, Pain

ACE – M

ORAL SUSPENSION
60 ml

Composition

Paracetamol 125mg + Mefenamic Acid 50mg/5ml

Indications & Uses

Pain, Fever

FLORIN – 50

ORAL SUSPENSION
30 ml

Composition

Ofloxacin 50mg/5ml

Indications & Uses

Acute exacerbations of chronic bronchitis, community acquired Pneumonia, soft skin and skin structure infections

ACE – CET – P

SYRUP
60 ml

Composition

Paracetamol 125mg + PPH 5mg + Cetirizine HCI 2mg/5ml

Indications & Uses

Fever, common cold & Flu

KWOSNIL – DSR

CAPSULES ( HARD GELATIN)
10X10 (Alu-Alu)

Composition

Pantoprazole 40mg (EC) + Domperidone 30mg (SR)

Indications & Uses

GERD, Dyspepsia, Acid Peptic Disorders, Gastritis

TAPEN-DSR

CAPSULES ( HARD GELATIN)
11X10 (Alu-Alu)

Composition

Rabeprazole 20mg (EC) + Domperidone SR

Indications & Uses

GERD, Dyspepsia, Acid Peptic Disorders, Gastritis

KWOSNIL – DSR

CAPSULES ( HARD GELATIN)
10X10 (Alu-Alu)

Composition

Pantoprazole 40mg (EC) + Domperidone 30mg (SR)

Indications & Uses

GERD, Dyspepsia, Acid Peptic Disorders, Gastritis

ZAPRA – DSR

CAPSULES ( HARD GELATIN)
11X10 (Alu-Alu)

Composition

Rabeprazole 20mg (EC) + Domperidone SR

Indications & Uses

GERD, Dyspepsia, Acid Peptic Disorders, Gastritis

KWOSNIL – 40

INJECTION
40ml

Composition

Pantoprazole Sodium 40mg + NaCL

Indications & Uses

Acid-peptic disorders in hospitalized patients, Zollinger – Ellison Syndrome, Treatment of GERD Associated with Erasive Esophagitis, GL Bleed

NATIC

SUSPENSION
170ml

Composition

Activated Dimethicone 25mg + Magnesium Hydroxide 200mg+ Aluminium Hydroxide Gel 200mg/10ml

Indications & Uses

Heartburn, Acid Indigestion

AISZYME

SYRUP
200ml

Composition

Alpha Amylase (1:2000) 50mg, Pepsin(1:3000) 10mg/5ml

Indications & Uses

Dyspepsia, Flatulence, Anorexia, Pancreatic Insufficiency

BONFOL – Z

CAPSULES (HARD GELATIN)
10X3X10

Composition

Vitamin C 75mg + Vitamin B12 5mcg + Carbonyl Iron 100mg + Folic Acid 1.5mg + Zinc Sulphate 61.8mg

Indications & Uses

Hyphocromic Anemia in Pregnancy, Chronic and / or Acute Blood Loss, Post-gynaesurgery, Iron Deficiency Anemia

AID-D3 60K

CAPSULES (SOFT GELATIN)
10X1X4

Composition

Cholecalciferol 60000 UI

Indications & Uses

Osteoporosis, Osteoarthritis, Musculoskeletal Pain, Type- 2 Diabetes, Menstrual Irregularities, Pre-eclampsia, IUGR

ROBOTONE

ORAL SUSPENSION
200 ml

Composition

Calcium Carbonate 625mg, Vitamin D3 125 IU/5ml

Indications & Uses

Osteomalacia, Osteoporosis, Fractures, Premenstrual Syndrome

HAEMLING

SYRUP (IRON TONIC)
300 ml

Composition

Iron (III) Hydroxide Polymaltose 50mg, Folic Acid 0.5mg/15ml

Indications & Uses

Pregnancy and lactation, Iron Deficiency Anaemia, Anaemia due to Excessive Haemorrhage, Anaemia Associated with Infections and Malignant Disease

CIUM

CAPSULES (SOFT GELATIN)
5X2X15

Composition

Calcitriol 0.25mcg + Calcium Carbonate 500mg + Zinc Sulphate 7.5mg

Indications & Uses

Osteoporosis, Hypoparathyroidism, Pregnancy & Lactation, Premenstrual Syndrome

MEF – DSPAS

TABLETS
20X10

Composition

Mefenamic Acid 250mg + Dicyclomine HCI 10mg

Indications & Uses

Dysmenorrhea, Irritable Bowel Syndrome, Colic and Bladder Spasm, Abdominal Pain

NAS – 2

TABLETS (BLISTERS)
20X10

Composition

Nimeulide 100mg + Paracetamo; 325mg

Indications & Uses

Minor Pain of Arthiritis, Muscular Aches, Backache, Toothache, Headache, Pre-menstrual and Menstrual Cramps

NAC – P

TABLETS
20X10

Composition

Aceclofenac 100mg + Paracetamol 325mg

Indications & Uses

Arthritis Pain, Soft Tissue Trauma Including Sprains, Musculoskeletal Pain, Pain Following Dental Extraction

TP – FORTE

TABLETS (BLISTERS)
20X10

Composition

Tramadol 37.5mg +Paracetamol 325mg

Indications & Uses

Chronic Back Pain, Osteoarthritis, Postoperative Pain

SYREGO

POWDER FOR ORAL SUSPENSION
30ML (HDPE BOTTLE)

Composition

Cefpodoxime 50mg/5ml <

Indications & Uses

UTIs, LRTs

SWIFT – HEEL

CREAM
20g

Composition

Urea 10% +Lactic Acid 10% + Propylene Glycol 10% + Liquid Paraffin 10%

Indications & Uses

Foot Cracks, Keratolytic

OTIZOB

OINTMENT
15g

Composition

Clotrimazole 1% w/w + Beclomethasone Dipropionate 0.025% w/w + Neomycin 0.5% w/w

Indications & Uses

Eczema, Psoriasis, Corticosteroid Responsive Dermatoses

DANDNIL

LOTION
100 ml

Composition

Ketoconazole 2% w/v

Indications & Uses

Pityriasis, Dandruff

DANDNIL – Z

LOTION
100 ml

Composition

Ketoconazole Shampoo 2% w/v + ZPTO 1% w/v

Indications & Uses

Pityriasis, Dandruff

DANDNIL

SOAP
75g

Composition

Ketoconazole 1% w/w

Indications & Uses

Tinea Versicolor, Prophylaxis of Pityriasis Versicolor

FLUVERA – 200

TABLETS
20X1X1

Composition

Fluconazole 200mg

Indications & Uses

Vaginal Candidiasis, Brochopulmonary Infections, Candiduria, Tinea Pedis, Corposis, Cruris, Versicolor

MAGMA -VIT

SYRUP
200ml

Composition

L-Iysine HCI 25mg + Vitamin B1 2.5mg + Vitamin B2 2.5mg + Vitamin B6 0.75mg + D-panthenol 3mg +Niacinamide 25mg + Mecobalamin 2mcg/10ml

Indications & Uses

Sub-optimal Growth, Poor Weight Gain, Malnutrition, Prolonged Illness

LYCOVERVE GOLD

SYRUP
225ml

Composition

Each 10ml Contains: Lycopene 6% 1000mcg + Vitamin A Palmitate 2500 IU + Vitamin E 10 IU + Ascorbic Acid 50mg + Selenium (as Sodium Selenate) 35mcg + Zinc (As Zinc Gluconate) 3mg + Manganese (as Manganese Gluconate) 2mg + Iodine ( As Potassium Iodine) 100mcg + Copper (As Copper Sulphate0 500mcg + Thiamine HCI 2mg + Riboflavine 3mg + Pyridoxine HCI 1.5mg

Indications & Uses

Tiredness, Stress, Feeling of Weakness, Vitality Deficiency

CAROVI

CAPSULES (SOFT GELATIN)
10X1X10

Composition

Antioxidant, Multivitamin & Multiminerals

Indications & Uses

Tiredness, Stress, Feeling of Weakness, Vitality Deficiency

WEETE

CAPSULES (SOFT GELATIN)
10X1X10

Composition

Vitamin E (Natural) 400 IU + Wheat Germ Oil 100mg + Omega 3 Fatty Acids 30mg

Indications & Uses

Ulcerative colitis, Metabolic Syndrome, Rheumatoid Arthritis, Type-2 Diabetes, Cardiovascular Diseases

CAROVI-4G

CAPSULES (SOFT GELATIN)
10X1X10

Composition

Omega 3 Fatty Acid + Ginseng Extract + Ginkgo Bilaba Extract + Grape Seed Extract + Ginseng Extract + Multimineral + Multivitamin + Antioxidants + Trace Elements

Indications & Uses

Tiredness, Stress, Feeling of Weakness, Vitality Deficiency

CAROVI G

CAPSULES (SOFT GELATIN)
10X1X10

Composition

Ginseng + Multivitamin + Multimineral

Indications & Uses

Tiredness, Stress, Feeling of Weakness, Vitality Deficiency

LYCOVERVE PLUS

CAPSULES (SOFT GELATIN)
10X1X10

Composition

Each SG Contains Lycopene 6% 2000 IU + Vitamin A 2500 IU + Vitamin E Acetate 10 IU + Vitamin C 50 mg + Zinc sulphate Monohydrate 27.45mg + Selenium Dioxide 70mcg

Indications & Uses

Idiopathic Male Infertility, Pre-eclampsia, Prostate Cancer, Cardiovascular Diseases, Diabetes Mellitus

CEFTAR-200 LB

TABLETS (Alu-Alu)
20X10

Composition

Cefixime 200mg + Lactic Acid Bacilus 2.5 billion spores

Indications & Uses

Otitis Media, Pharyngitis & Tonsillitis, Uncomplicated Urinary Tract Infections, Acute Exacerbations of Chronic Bronchitis, Enteric Fever

CEFTAR-CV-325

TABLETS (Alu-Alu)
10X1X6

Composition

Cefixime 200mg + Potassium Clavulanate 125mg

Indications & Uses

Respiratory Tract Infections, Urinary Tract Infections, Skin & Skin Structure Infections

AISIMOX – CLAV 625

TABLETS (Alu-Alu)
10X1X7

Composition

Amoxycillin 500mg + Potassium Clavulanate 125mg

Indications & Uses

Respiratory Tract Infections, Community Acquired Pneumonia, Gynaecological Infections, Acute Exacerbations of Chronic Bronchitis, Skin and Soft Tissue Infections

ROFLOX – O

TABLETS (Blister)
20X10

Composition

Ofloxacin 200mg + Ornidazole 500mg

Indications & Uses

Surgical ions, Diarrheas of Mixed Etiology, Gynaecological Infections, Orofacial and Dental Infections

NTILEVO

TABLETS
10X10

Composition

Levofloxacin 500mg

Indications & Uses

Acute Bacterial Sinusitis, Acute Bacterial Exacerbations of Chronic Bronchitis, Skin & Skin Structure Infections, Chronic Bacterial Prostatitis, Urinary Tract Infections

ROFLOX – O

TABLETS (Alu-Alu)
20X10

Composition

Ofloxacin 200mg

Indications & Uses

Community Acquired Pneumonia, Multiple Drug Resistant-TB, Typhoid

CEFTAR – O

TABLETS (Alu-Alu)
10X1X10

Composition

Cefixime 200mg + Ofloxacin 200mg

Indications & Uses

RTIs, Otitis Media, Sinustis, UTIs, Typhoid

AISIMOX – CLAV – 1.2

INJECTIONS
1.2g

Composition

Amoxycillin 1000mg + Potassium Clavulanate 200mg + WFI

Indications & Uses

Community Acquired Pneumonia, Gynaecological Infections, Upper Respiratory Tract Infections, Skin and Soft Tissue Infections, Urinary Tract Infections, Acute Exacerbations of Chronic Bronchitis

XC – SB 1.5

INJECTIONS
1.5g

Composition

Ceftriaxone 1000mg + Sulbactam 500mg + WFI

Indications & Uses

Gynaecological Infections, Lower Respiratory Tract Infections, Intra-abdominal Infections with Aerobic Organisms, Surgical Prophylaxis

FOPER-SB 1.5

INJECTIONS
1.5gm

Composition

Cefaperazone 1000mg + Sulbactam 500mg +WFI

Indications & Uses

Peritonitis, Bacterial Simusitis, Cholecystitis, Meningitis

M-HAWK

INJECTIONS
1gm

Composition

Meropenem 1gm + WFI

Indications & Uses

Complicated Intra-abdominal Infection (cIAI), Complicated Skin & Skin Structure Infections (cSSSI), Bacterial Meningitis, Noscocomial Pneumonia

PTZ-4.5

INJECTIONS
4.5gm

Composition

Piperacillin 4000mg + Tazobactam 500mg + WFI

Indications & Uses

Intra-abdominal Infections, Complicated Urinary Tract Infections, Febrile Neutropenia, Lower Respiratory Tract Infections

OXIME-200

TABLETS (Alu-Alu)
10X1X6

Composition

Cefpodoxime Proxetil 200mg

Indications & Uses

Pharyngitis, CAP, Tonsilitis

KHAASHNIL

SYRUP
100ml

Composition

Ambroxol HCI 15mg + Guaiphensin 50mg + Terbutaline Sulphate 1.5mg + Mentholated Base/5ml

Indications & Uses

Bronchitis, Productive Cough, Emphysema, Bronchial Asthma

KHAASHNIL – BR

SYRUP
100ml

Composition

Terbutaline Sulphate 2.5mg + Bromhexine HCI 8mg + Guaiphenesin 100mg + Methalated Base/5ml

Indications & Uses

Acute Cough, Abnormal Mucus Secretion, Productive Cough

ENYPHIL

SYRUP
100ml

Composition

Dextromethorphan Hydrobromide 10mg + Phenylpherine 5 mg + Cetrizine 5mg + Mentholated Base/5ml

Indications & Uses

Commom Cold and Flu, Nasal Congestion, Sore Throat

LEVKAST

TABLETS (Alu-Alu)
20X10

Composition

Levocetirizine 5mg + Montelukast 10mg

Indications & Uses

Allergic Rhinitis, Nasal Congestion, Asthma

AISLET

TABLETS (Alu-Alu)
20X10

Composition

Levocetirizine 5mg

Indications & Uses

Chronic Idiopathic Urticaria (CIU), Seasonal Allergic Rhinitis (SAR), Perennial Allergic Rhinitis (PAR)

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