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diff --git a/pdf/pdf_array.h b/pdf/pdf_array.h
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+++ b/pdf/pdf_array.h
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+/* Copyright (C) 2018-2021 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* array handling for the PDF interpreter */
+
+#ifndef PDF_ARRAY_FUNCTIONS
+#define PDF_ARRAY_FUNCTIONS
+
+static inline uint64_t pdfi_array_size(pdf_array *a) { return a->size; }
+
+void pdfi_free_array(pdf_obj *o);
+int pdfi_array_alloc(pdf_context *ctx, uint64_t size, pdf_array **a);
+int pdfi_array_from_stack(pdf_context *ctx, uint32_t indirect_num, uint32_t indirect_gen);
+int pdfi_array_get_no_deref(pdf_context *ctx, pdf_array *a, uint64_t index, pdf_obj **o);
+int pdfi_array_get_no_store_R(pdf_context *ctx, pdf_array *a, uint64_t index, pdf_obj **o);
+int pdfi_array_get(pdf_context *ctx, pdf_array *a, uint64_t index, pdf_obj **o);
+int pdfi_array_get_type(pdf_context *ctx, pdf_array *a, uint64_t index, pdf_obj_type t, pdf_obj **o);
+int pdfi_array_get_int(pdf_context *ctx, pdf_array *a, uint64_t index, int64_t *i);
+int pdfi_array_get_number(pdf_context *ctx, pdf_array *a, uint64_t index, double *f);
+int pdfi_array_put(pdf_context *ctx, pdf_array *a, uint64_t index, pdf_obj *o);
+int pdfi_array_put_int(pdf_context *ctx, pdf_array *a, uint64_t index, int64_t val);
+int pdfi_array_put_real(pdf_context *ctx, pdf_array *a, uint64_t index, double val);
+
+bool pdfi_array_known(pdf_context *ctx, pdf_array *a, pdf_obj *, int *index);
+
+void pdfi_normalize_rect(pdf_context *ctx, gs_rect *rect);
+int pdfi_array_to_gs_rect(pdf_context *ctx, pdf_array *array, gs_rect *rect);
+int pdfi_gs_rect_to_array(pdf_context *ctx, gs_rect *rect, pdf_array **new_array);
+int pdfi_array_to_gs_matrix(pdf_context *ctx, pdf_array *array, gs_matrix *matrix);
+int pdfi_array_to_num_array(pdf_context *ctx, pdf_array *array, double *out, int start, int size);
+void pdfi_bbox_transform(pdf_context *ctx, gs_rect *bbox, gs_matrix *matrix);
+
+#endif