Basic TTC (collection) support.HEADv0.0.7main

5 files changed, 141 insertions, 2 deletions

diff --git a/src/collection.cc b/src/collection.cc
new file mode 100644
index 0000000..1482b42
--- /dev/null
+++ b/src/collection.cc
@@ -0,0 +1,73 @@
+/*
+    Copyright (C) 2026 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libttf.
+
+    libttf is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libttf 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libttf.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "collection.h"
+#include "util.h"
+#include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
+#include <iostream>
+
+
+using namespace ttf;
+
+
+Collection::Collection(boost::filesystem::path const& ttf_file)
+{
+	boost::filesystem::ifstream str(ttf_file, std::ios::binary);
+	std::vector<uint8_t> data(boost::filesystem::file_size(ttf_file));
+	str.read(reinterpret_cast<char*>(data.data()), data.size());
+
+	Source source(data);
+	read_source(source);
+}
+
+
+Collection::Collection(uint8_t const* data, int size)
+{
+	Source source(data, size);
+	read_source(source);
+}
+
+
+void
+Collection::read_source(Source& source)
+{
+	auto const ttc_tag = source.get_uint32();
+	if (ttc_tag != 0x74746366) {
+		throw InvalidTTCTag(ttc_tag);
+	}
+
+	auto const major_version = source.get_uint16();
+	auto const minor_version = source.get_uint16();
+	auto const num_fonts = source.get_uint32();
+
+	if (num_fonts == 0) {
+		return;
+	}
+
+	uint32_t offset = source.get_uint32();
+	for (uint32_t i = 0; i < num_fonts; ++i) {
+		Source font_source(source, offset);
+		_fonts.push_back(Font(font_source));
+	}
+}
+
+
diff --git a/src/collection.h b/src/collection.h
new file mode 100644
index 0000000..5fdc551
--- /dev/null
+++ b/src/collection.h
@@ -0,0 +1,59 @@
+/*
+    Copyright (C) 2026 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libttf.
+
+    libttf is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libttf 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libttf.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#pragma once
+
+#include "font.h"
+#include <boost/filesystem.hpp>
+#include <fmt/format.h>
+
+class Source;
+
+
+namespace ttf {
+
+
+class InvalidTTCTag : public std::runtime_error
+{
+public:
+	InvalidTTCTag(uint32_t ttc_type) : std::runtime_error(fmt::format("Invalid TTC type 0x{0:x}", ttc_type)) {}
+};
+
+
+class Collection
+{
+public:
+	Collection(boost::filesystem::path const& ttc_file);
+	Collection(uint8_t const* data, int size);
+
+	std::vector<Font> fonts() const {
+		return _fonts;
+	}
+
+private:
+	void read_source(Source& source);
+
+	std::vector<Font> _fonts;
+};
+
+
+
+}
diff --git a/src/font.cc b/src/font.cc
index ac2c5a8..f3387a4 100644
--- a/src/font.cc
+++ b/src/font.cc
@@ -51,6 +51,12 @@ Font::Font(uint8_t const* data, int size)
 }
 
 
+Font::Font(Source& source)
+{
+	read_source(source);
+}
+
+
 void
 Font::read_source(Source& source)
 {
diff --git a/src/font.h b/src/font.h
index 99cb892..e9ce85d 100644
--- a/src/font.h
+++ b/src/font.h
@@ -46,6 +46,7 @@ public:
 	Font(boost::filesystem::path const& ttf_file);
 	/** Read and parse a TTF font from a block of memory */
 	Font(uint8_t const* data, int size);
+	Font(Source& source);
 
 	/** Write the font to a file */
 	void write(boost::filesystem::path const& ttf_file) const;
diff --git a/src/wscript b/src/wscript
index cc77f04..9c268c8 100644
--- a/src/wscript
+++ b/src/wscript
@@ -18,8 +18,8 @@
 #
 
 def build(bld):
-    sources = 'font.cc name_table.cc table.cc util.cc'
-    headers = 'font.h name_table.h table.h util.h'
+    sources = 'collection.cc font.cc name_table.cc table.cc util.cc'
+    headers = 'collection.h font.h name_table.h table.h util.h'
 
     if bld.env.STATIC:
         obj = bld(features='cxx cxxstlib')