Changing AbstractString where relevant

Author: sambitdash

src/CosDoc.jl

@@ -37,7 +37,7 @@ mutable struct CosDocImpl <: CosDoc
   tmpfiles::Vector{AbstractString}
   isPDF::Bool
   hasNativeXRefStm::Bool
-  function CosDocImpl(fp::String)
+  function CosDocImpl(fp::AbstractString)
     io = util_open(fp,"r")
     sz = filesize(fp)
     ps = BufferedInputStream(io)
@@ -84,13 +84,13 @@ end
 
 """
 ```
-    cosDocOpen(filepath::String) -> CosDoc
+    cosDocOpen(filepath::AbstractString) -> CosDoc
 ```
 Provides the access to the physical file and file structure of the PDF document. Returns a
 `CosDoc` which can be subsequently used for all query into the PDF files. Remember to
 release the document with `cosDocClose`, once the object is used.
 """
-function cosDocOpen(fp::String)
+function cosDocOpen(fp::AbstractString)
     doc = CosDocImpl(abspath(fp));
     ps = doc.ps
     h = read_header(ps)

src/CosObject.jl

@@ -128,7 +128,7 @@ Name objects are symbols used in PDF documents.
 """
 struct CosName <: CosObject
     val::Symbol
-    CosName(str::String)=new(Symbol("CosName_",str))
+    CosName(str::AbstractString) = new(Symbol("CosName_",str))
 end
 
 """

src/PDDocImpl.jl

@@ -4,7 +4,7 @@ mutable struct PDDocImpl <: PDDoc
     pages::CosObject
     structTreeRoot::CosObject
     isTagged::Symbol #Valid values :tagged, :none and :suspect
-    function PDDocImpl(fp::String)
+    function PDDocImpl(fp::AbstractString)
         cosDoc = cosDocOpen(fp)
         catalog = cosDocGetRoot(cosDoc)
         new(cosDoc,catalog,CosNull,CosNull,:none)