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+/*
+ * TIFF Common Routines
+ * Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * TIFF Common Routines
+ * @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
+ */
+
+#ifndef AVCODEC_TIFF_COMMON_H
+#define AVCODEC_TIFF_COMMON_H
+
+#include "avcodec.h"
+#include "tiff.h"
+#include "bytestream.h"
+#include "libavutil/bprint.h"
+
+/** data type identifiers for TIFF tags */
+enum TiffTypes {
+ TIFF_BYTE = 1,
+ TIFF_STRING,
+ TIFF_SHORT,
+ TIFF_LONG,
+ TIFF_RATIONAL,
+ TIFF_SBYTE,
+ TIFF_UNDEFINED,
+ TIFF_SSHORT,
+ TIFF_SLONG,
+ TIFF_SRATIONAL,
+ TIFF_FLOAT,
+ TIFF_DOUBLE,
+ TIFF_IFD
+};
+
+/** sizes of various TIFF field types (string size = 100)*/
+static const uint8_t type_sizes[14] = {
+ 0, 1, 100, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 4
+};
+
+static const uint16_t ifd_tags[] = {
+ 0x8769, // EXIF IFD
+ 0x8825, // GPS IFD
+ 0xA005 // Interoperability IFD
+};
+
+
+/** Returns a value > 0 if the tag is a known IFD-tag.
+ * The return value is the array index + 1 within ifd_tags[].
+ */
+int ff_tis_ifd(unsigned tag);
+
+/** Reads a short from the bytestream using given endianness. */
+unsigned ff_tget_short(GetByteContext *gb, int le);
+
+/** Reads a long from the bytestream using given endianness. */
+unsigned ff_tget_long(GetByteContext *gb, int le);
+
+/** Reads a double from the bytestream using given endianness. */
+double ff_tget_double(GetByteContext *gb, int le);
+
+/** Reads a byte from the bytestream using given endianness. */
+unsigned ff_tget(GetByteContext *gb, int type, int le);
+
+/** Returns an allocated string containing count
+ * rational values using the given separator.
+ */
+char *ff_trationals2str(int *rp, int count, const char *sep);
+
+/** Returns an allocated string containing count
+ * long values using the given separator.
+ */
+char *ff_tlongs2str(int32_t *lp, int count, const char *sep);
+
+/** Returns an allocated string containing count
+ * double values using the given separator.
+ */
+char *ff_tdoubles2str(double *dp, int count, const char *sep);
+
+/** Returns an allocated string containing count
+ * short values using the given separator.
+ */
+char *ff_tshorts2str(int16_t *sp, int count, const char *sep);
+
+/** Adds count rationals converted to a string
+ * into the metadata dictionary.
+ */
+int ff_tadd_rational_metadata(int count, const char *name, const char *sep,
+ GetByteContext *gb, int le, AVDictionary **metadata);
+
+/** Adds count longs converted to a string
+ * into the metadata dictionary.
+ */
+int ff_tadd_long_metadata(int count, const char *name, const char *sep,
+ GetByteContext *gb, int le, AVDictionary **metadata);
+
+/** Adds count doubles converted to a string
+ * into the metadata dictionary.
+ */
+int ff_tadd_doubles_metadata(int count, const char *name, const char *sep,
+ GetByteContext *gb, int le, AVDictionary **metadata);
+
+/** Adds count shorts converted to a string
+ * into the metadata dictionary.
+ */
+int ff_tadd_shorts_metadata(int count, const char *name, const char *sep,
+ GetByteContext *gb, int le, int is_signed, AVDictionary **metadata);
+
+/** Adds count bytes converted to a string
+ * into the metadata dictionary.
+ */
+int ff_tadd_bytes_metadata(int count, const char *name, const char *sep,
+ GetByteContext *gb, int le, int is_signed, AVDictionary **metadata);
+
+/** Adds a string of count characters
+ * into the metadata dictionary.
+ */
+int ff_tadd_string_metadata(int count, const char *name,
+ GetByteContext *gb, int le, AVDictionary **metadata);
+
+/** Decodes a TIFF header from the input bytestream
+ * and sets the endianness in *le and the offset to
+ * the first IFD in *ifd_offset accordingly.
+ */
+int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset);
+
+/** Reads the first 3 fields of a TIFF tag, which are
+ * the tag id, the tag type and the count of values for that tag.
+ * Afterwards the bytestream is located at the first value to read and
+ * *next holds the bytestream offset of the following tag.
+ */
+int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type,
+ unsigned *count, int *next);
+
+#endif /* AVCODEC_TIFF_COMMON_H */