Create Custom Predefined CMaps Provider

Product Version	Product	Author
2021.1.118	RadPdfProcessing	Martin Velikov

Description

How to create a custom implementation of the PredefinedCMapsProviderBase in order to use a custom CMAP table.

Solution

This functionality could be achieved by creating a custom class inheriting the PredefinedCMapsProviderBase and passing it to PredefinedCMapsProvider property of the FixedExtensibilityManager class.

Creating a custom class inheriting PredefinedCMapsProviderBase

internal class CustomPredefinedCMapsProvider : PredefinedCMapsProviderBase 
{ 
    private readonly PredefinedCMapsProviderBase predefinedCMapsProvider; 
 
    public CustomPredefinedCMapsProvider(PredefinedCMapsProviderBase predefinedCMapsProvider) 
    { 
        this.predefinedCMapsProvider = predefinedCMapsProvider; 
    } 
 
    public override byte[] GetCidCMapData(string name) 
    { 
        if (name == "90ms-RKSJ-V") 
        { 
            return File.ReadAllBytes("90ms-RKSJ-V"); 
        } 
 
        return this.predefinedCMapsProvider.GetCidCMapData(name); 
    } 
 
    public override byte[] GetUnicodeCMapData(string name) 
    { 
        return this.predefinedCMapsProvider.GetUnicodeCMapData(name); 
    } 
} 

Set the custom PredefinedCMapsProvider the FixedExtensibilityManager.PredefinedCMapsProvider

FixedExtensibilityManager.PredefinedCMapsProvider = new CustomPredefinedCMapsProvider(new PredefinedCMapsProvider());