From 5c1f80ffb6bcd977439802b3fdd220d4572b2940 Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Sat, 20 Apr 2024 17:00:36 +0100
Subject: [PATCH] Move tiffread definitions to separate header files

---
 src/tiffread.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 src/tiffread.h

diff --git a/src/tiffread.h b/src/tiffread.h
new file mode 100644
index 0000000..11a23ba
--- /dev/null
+++ b/src/tiffread.h
@@ -0,0 +1,87 @@
+#ifndef TIFFREAD_H
+#define TIFFREAD_H
+
+#include "aliases.h"
+
+#define TAG_MAX_COUNT (UINT16_MAX * sizeof(const char *))
+// Technically, the type parameter is 2-bytes long, but there aren't so many
+// types specified in the spec, so UINT8_MAX should be sufficient
+#define TYPE_MAX_COUNT (UINT8_MAX * sizeof(const char *))
+
+// clang-format off
+enum {
+  TIFF_ORDER_LITTLE_ENDIAN = 0x4949,
+  TIFF_ORDER_BIG_ENDIAN    = 0x4d4d,
+};
+// clang-format on
+
+typedef struct hdr TiffHdr;
+struct hdr {
+  u16 order;
+  u16 magic;
+  u32 first_ifd_offset;
+};
+
+// clang-format off
+enum tiff_public_tags {
+  #include "tiff_public_tags.inc"
+};
+
+const char *tag_names[TAG_MAX_COUNT] = {
+  #define TIFF_TAG_LOOKUP
+  #include "tiff_public_tags.inc"
+  #undef TIFF_TAG_LOOKUP
+};
+
+enum tiff_field_types {
+  #include "tiff_field_types.inc"
+};
+
+const char *filed_type_names[TYPE_MAX_COUNT] = {
+  #define TIFF_TYPE_LOOKUP
+  #include "tiff_field_types.inc"
+  #undef TIFF_TYPE_LOOKUP
+};
+// clang-format on
+
+typedef struct field TiffField;
+struct field {
+  u16 tag;
+  u16 type;
+  u32 count;
+  u32 value_offset;
+};
+
+typedef struct IFD TiffIFD;
+struct IFD {
+  u16 count;
+  TiffField *fields;
+  u32 next_ifd;
+};
+
+// clang-format off
+enum tiff_compression {
+  TIFF_COMPRESSION_UNCOMPRESSED = 0x0001,
+  TIFF_COMPRESSION_CCITT_1D     = 0x0002,
+  TIFF_COMPRESSION_GROUP_3_FAX  = 0x0003,
+  TIFF_COMPRESSION_GROUP_4_FAX  = 0x0004,
+  TIFF_COMPRESSION_LZW          = 0x0005,
+  TIFF_COMPRESSION_JPEG         = 0x0006,
+  TIFF_COMPRESSION_PACK_BITS    = 0x8005,
+};
+// clang-format on
+
+// clang-format off
+enum tiff_photometric_interpretation {
+  TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO     = 0x0000,
+  TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO     = 0x0001,
+  TIFF_PHOTOMETRIC_INTERPRETATION_RGB               = 0x0002,
+  TIFF_PHOTOMETRIC_INTERPRETATION_RGB_PALETTE       = 0x0003,
+  TIFF_PHOTOMETRIC_INTERPRETATION_TRANSPARENCY_MASK = 0x0004,
+  TIFF_PHOTOMETRIC_INTERPRETATION_CMYK              = 0x0005,
+  TIFF_PHOTOMETRIC_INTERPRETATION_YCbCr             = 0x0006,
+  TIFF_PHOTOMETRIC_INTERPRETATION_CIELab            = 0x0008,
+};
+// clang-format on
+
+#endif // !TIFFREAD_H