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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/pdfium/pdfium_permissions.h"
#include "base/notreached.h"
namespace chrome_pdf {
// static
PDFiumPermissions PDFiumPermissions::CreateForTesting(
int permissions_handler_revision,
unsigned long permission_bits) {
return PDFiumPermissions(permissions_handler_revision, permission_bits);
}
PDFiumPermissions::PDFiumPermissions(FPDF_DOCUMENT doc)
: permissions_handler_revision_(FPDF_GetSecurityHandlerRevision(doc)),
permission_bits_(FPDF_GetDocPermissions(doc)) {}
PDFiumPermissions::PDFiumPermissions(int permissions_handler_revision,
unsigned long permission_bits)
: permissions_handler_revision_(permissions_handler_revision),
permission_bits_(permission_bits) {}
bool PDFiumPermissions::HasPermission(
PDFEngine::DocumentPermission permission) const {
// PDF 1.7 spec, section 3.5.2 says: "If the revision number is 2 or greater,
// the operations to which user access can be controlled are as follows: ..."
//
// Thus for revision numbers less than 2, permissions are ignored and this
// always returns true.
if (permissions_handler_revision_ < 2)
return true;
if (permissions_handler_revision_ == 2) {
// Security handler revision 2 rules are simple.
switch (permission) {
case PDFEngine::PERMISSION_COPY:
case PDFEngine::PERMISSION_COPY_ACCESSIBLE:
// Check the same copy bit for all copying permissions.
return (permission_bits_ & kPDFPermissionCopyMask) != 0;
case PDFEngine::PERMISSION_PRINT_LOW_QUALITY:
case PDFEngine::PERMISSION_PRINT_HIGH_QUALITY:
// Check the same printing bit for all printing permissions.
return (permission_bits_ & kPDFPermissionPrintMask) != 0;
}
} else {
// Security handler revision 3+ have different rules for interpreting the
// bits in |permission_bits_|.
switch (permission) {
case PDFEngine::PERMISSION_COPY:
return (permission_bits_ & kPDFPermissionCopyMask) != 0;
case PDFEngine::PERMISSION_COPY_ACCESSIBLE:
return (permission_bits_ & kPDFPermissionCopyAccessibleMask) != 0;
case PDFEngine::PERMISSION_PRINT_LOW_QUALITY:
return (permission_bits_ & kPDFPermissionPrintMask) != 0;
case PDFEngine::PERMISSION_PRINT_HIGH_QUALITY:
return (permission_bits_ & kPDFPermissionPrintMask) != 0 &&
(permission_bits_ & kPDFPermissionPrintHighQualityMask) != 0;
}
}
NOTREACHED() << "Unknown permission " << permission;
return true;
}
} // namespace chrome_pdf
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