Add support for model files

Model files are zip archives with a "model.toml" file at the root describing
the model and all its textures.

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required( VERSION 3.0 )
 project( Facecam2D VERSION 0.1.0 )
+find_package( libzip REQUIRED )
 find_package( OpenCV REQUIRED )
 message (STATUS "Found OpenCV at: " ${OpenCV_INCLUDE_DIRS} )
 find_package( OpenGL REQUIRED )
@@ -38,5 +39,8 @@ add_executable( fc2d
 	src/cv.cpp
 	src/paths.cpp
 	src/args.cpp
+	src/model.cpp
+	src/toml.c
+	src/tomlcpp.cpp
 )
-target_link_libraries( fc2d ${OpenCV_LIBS} ${OPENGL_LIBRARIES} FreeGLUT::freeglut GLEW::glew )
+target_link_libraries( fc2d ${OpenCV_LIBS} ${OPENGL_LIBRARIES} FreeGLUT::freeglut GLEW::glew zip )

src/cv.cpp

@@ -6,6 +6,8 @@
 #include <graphics.hpp>
 #include <paths.hpp>
 #include <args.hpp>
+#include <cv.hpp>
+#include <modelpart.hpp>
 
 cv::Ptr<cv::face::Facemark> facemark;
 cv::CascadeClassifier haarFaceDetector;
@@ -101,30 +103,29 @@ void cvFrame() {
 
 		//send control information to graphics
 		float faceSize = landmarks[biggestFace][14].x - landmarks[biggestFace][2].x;
-		updateModel(
-			//head position
-			glm::vec2(
+
+		struct FaceData faceData;
+		faceData.positions[BIND_NULL] = glm::vec2(0.0f, 0.0f);
+		faceData.positions[BIND_HEAD] = glm::vec2(
 			(landmarks[biggestFace][2].x + landmarks[biggestFace][14].x) / 2
 				* 2 / (float)frame.cols - 1,
 			(landmarks[biggestFace][2].y + landmarks[biggestFace][14].y) / 2
 				* 2 / (float)frame.rows - 1
-			),
-
-			//face position
-			glm::vec2(
+			);
+		faceData.positions[BIND_FACE] = glm::vec2(
 			landmarks[biggestFace][30].x * 2 / (float)frame.cols - 1,
 			landmarks[biggestFace][30].y * 2 / (float)frame.rows - 1
-			),
+			);
+		faceData.triggers[TRIGGER_NULL] = false;
+		faceData.triggers[TRIGGER_MOUTH_OPEN] = 
+		(landmarks[biggestFace][66].y - landmarks[biggestFace][62].y) / faceSize > 0.04f;
 
-			//rotation
-			atanf((float)(landmarks[biggestFace][14].y - landmarks[biggestFace][2].y) /
-				(float)(landmarks[biggestFace][2].x - landmarks[biggestFace][14].x)),
+		faceData.headRotation = atanf(
+			(float)(landmarks[biggestFace][14].y - landmarks[biggestFace][2].y) /
+			(float)(landmarks[biggestFace][2].x - landmarks[biggestFace][14].x));
+		faceData.scale = faceSize * 6 / (float)frame.cols;
 
-			//scale
-			faceSize * 6 / (float)frame.cols,
-
-			//mouth open/closed state
-			(landmarks[biggestFace][66].y - landmarks[biggestFace][62].y) / faceSize > 0.04f);
+		updateModel(faceData);
 	}
 }
 

src/cv.hpp

@@ -1,6 +1,17 @@
 #ifndef CV_HPP
 #define CV_HPP
 
+#include <map>
+#include <glm/vec2.hpp>
+
+struct FaceData {
+	std::map<int, glm::vec2> positions;
+	std::map<int, bool> triggers;
+
+	float headRotation;
+	float scale;
+};
+
 void initCV();
 
 void cvFrame();

src/graphics.cpp

@@ -12,21 +12,21 @@
 
 #include <graphics.hpp>
 #include <modelpart.hpp>
+#include <model.hpp>
 #include <paths.hpp>
 #include <config.hpp>
+#include <cv.hpp>
 
 GLuint shader;	//standard shader program used for all elements
 GLuint transUniform;	//location of the "transMatrix" transformation matrix uniform in the shader
 
 //parts of the model (see modelpart.hpp)
-ModelPart parts[3];
+Model* model;
 
 void display () {
 	glClear(GL_COLOR_BUFFER_BIT);
 
-	for (int i = 0; i < sizeof(parts)/sizeof(ModelPart); i++) {
-		parts[i].bindAndDraw();
-	}
+	model->draw();
 
 	glutSwapBuffers();
 }
@@ -82,10 +82,7 @@ void initGraphics () {
 
 	initShader();
 
-	parts[0] = ModelPart(resolvePath("models/test/head-base.png").c_str(), transUniform);
-	parts[1] = ModelPart(resolvePath("models/test/face-eyes.png").c_str(), transUniform);
-	parts[2] = ModelPart(resolvePath("models/test/face-mouth-closed.png").c_str(), transUniform);
-	parts[2].addTexture(resolvePath("models/test/face-mouth-open.png").c_str(), 1);
+	model = new Model(resolvePath("models/test.fma").c_str());
 
 	//enable blending for alpha textures
 	glEnable(GL_BLEND);
@@ -100,12 +97,12 @@ void initGraphics () {
 	std::cout << "graphics init complete" << std::endl;
 }
 
-void initTexture (GLuint* texNum, const char* path) {
+void initTexture (GLuint* texNum, unsigned char* buffer, size_t bufferLength) {
 	glGenTextures(1, texNum);
 	glBindTexture(GL_TEXTURE_2D, *texNum);
 
 	int x, y, channels;
-	GLubyte* pixels = stbi_load(path, &x, &y, &channels, 4);
+	GLubyte* pixels = stbi_load_from_memory(buffer, bufferLength, &x, &y, &channels, 4);
 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
@@ -175,11 +172,8 @@ void printShaderCompileLog(GLuint shader) {
 	std::cout << logBuffer << std::endl;
 }
 
-void initModel () {
-
-}
-
-void updateModel(glm::vec2 headPos, glm::vec2 facePos, float rotation, float scale, bool mouthOpen) {
+void updateModel(struct FaceData faceData) {
+	/*
 	//calculate transforms
 	parts[0].setTransform(headPos, rotation, scale);
 	parts[1].setTransform(facePos, rotation, scale);
@@ -187,6 +181,8 @@ void updateModel(glm::vec2 headPos, glm::vec2 facePos, float rotation, float sca
 
 	//set mouth texture to open or closed
 	parts[2].selectTexture(mouthOpen ? 1 : 0);
+	*/
+	model->updateTransforms(faceData);
 
 	//tell FreeGLUT to schedule a screen update
 	glutPostRedisplay();

src/graphics.hpp

@@ -9,18 +9,22 @@
 
 #include <glm/vec2.hpp>
 
+#include <cv.hpp>
+
+extern GLuint transUniform;
+
 void initGraphics ();
 
 void graphicsFrame ();
 
 void initBuffers (GLuint* vaoNum);
 
-void initTexture (GLuint* texNum, const char* path);
+void initTexture (GLuint* texNum, unsigned char* buffer, size_t bufferLength);
 
 void initShader();
 
 void printShaderCompileLog(GLuint shader);
 
-void updateModel(glm::vec2 headPos, glm::vec2 facePos, float rotation, float scale, bool mouthOpen);
+void updateModel(struct FaceData faceData);
 
 #endif

src/main.cpp

@@ -3,6 +3,7 @@
 #include <paths.hpp>
 #include <args.hpp>
 #include <config.hpp>
+#include <model.hpp>
 
 #include <iostream>
 #include <cstring>
@@ -17,8 +18,11 @@ int main (int argc, char** argv) {
 	std::cout << "Default asset prefix: " << prefixDefault << std::endl;
 
 	initGraphics();
+
+	//Model model(resolvePath("models/test.fma").c_str());
 	initCV();
 
+
 	while (true) {
 		cvFrame();
 

src/model.cpp

@@ -0,0 +1,113 @@
+#include <iostream>
+#include <vector>
+#include <zip.h>
+#include <tomlcpp.hpp> //dynamically link tomlcpp if it becomes common in repositories
+#include <model.hpp>
+
+#define BUFFER_SIZE_MODEL_DESC	8192		// 8 KiB
+#define BUFFER_SIZE_TEXTURE	16777220	// 16 MiB
+
+void textureFromArchive(zip_t* archive, const char* path, ModelPart* part, size_t slot, std::string triggerName) {
+	zip_file_t* textureFile = zip_fopen(archive, path, 0);
+	if (textureFile != NULL) {
+		unsigned char* textureBuffer = new unsigned char[BUFFER_SIZE_TEXTURE];
+		size_t textureLength = zip_fread(textureFile, textureBuffer, BUFFER_SIZE_TEXTURE-1);
+
+		part->addTexture(textureBuffer, textureLength, slot, triggerName);
+
+		delete [] textureBuffer;
+	} else {
+		std::cerr << path << " does not exist in archive!" << std::endl;
+	}
+}
+	
+
+Model::Model(const char* path) {
+	int zipError;
+	zip_t* archive = zip_open(path, ZIP_RDONLY, &zipError);
+
+	if (!archive) {
+		std::cerr << "Model file " << path << " does not exist!" << std::endl;
+		return;
+	}
+
+	// get model description file (model.toml)
+	zip_file_t* modelDescFile = zip_fopen(archive, "model.toml", 0);
+	char modelDescBuffer[BUFFER_SIZE_MODEL_DESC];
+	size_t descLength = zip_fread(modelDescFile, modelDescBuffer, BUFFER_SIZE_MODEL_DESC-1);
+	modelDescBuffer[descLength] = 0;	//null-terminate
+
+	// parse model.toml
+	auto modelDesc = toml::parse(std::string(modelDescBuffer));
+	if (!modelDesc.table) {
+		std::cerr << "cannot parse model.toml! " << std::endl << modelDesc.errmsg << std::endl;
+	}
+
+	auto partsDescArray = modelDesc.table->getArray("part");
+
+	auto partsVec = *partsDescArray->getTableVector();
+
+	for (int i = 0; i < partsVec.size(); i++) {
+		ModelPart newPart;
+
+		// position
+		auto bindResult = partsVec[i].getString("bind");
+		if (!bindResult.first) {
+			std::cerr << "Part " << i << " does not define a bind!" << std::endl;
+		} else {
+			newPart.setBind(bindResult.second);
+		}
+
+		auto parentResult = partsVec[i].getString("follow");
+		auto factorResult = partsVec[i].getDouble("factor");
+
+		if (parentResult.first) {
+			newPart.setFollowTarget(parentResult.second);
+
+			if (factorResult.first) {
+				newPart.setFollowFactor((float)factorResult.second);
+			} else {
+				newPart.setFollowFactor(1.0f);
+			}
+		}
+
+		// texture
+		auto textureSingle = partsVec[i].getString("texture");
+
+		if (textureSingle.first) {
+			// only a single texture was defined
+			textureFromArchive(archive, textureSingle.second.c_str(), &newPart, 0, "null");
+		} else {
+			auto textureArray = partsVec[i].getArray("textures");
+			auto textureVec = *textureArray->getTableVector().get();
+
+			if (textureVec.size() < 1) {
+				std::cerr << "Part " << i << " does not define any textures!" << std::endl;
+			} else {
+				// a list of textures with triggers were defined
+				for (int j = 0; j < textureVec.size(); j++) {
+					auto fileResult = textureVec[j].getString("file");
+					auto triggerResult = textureVec[j].getString("trigger");
+
+					if (fileResult.first) {
+						std::string trigger = triggerResult.first ? triggerResult.second : "null";
+						textureFromArchive(archive, fileResult.second.c_str(), &newPart, j, trigger);
+					}
+				}
+			}
+		}
+			parts.push_back(newPart);
+	}
+}
+
+void Model::draw() {
+	for (size_t i = 0; i < parts.size(); i++) {
+		parts[i].bindAndDraw();
+	}
+}
+
+void Model::updateTransforms(struct FaceData faceData) {
+	for (size_t i = 0; i < parts.size(); i++) {
+		parts[i].processFaceData(faceData);
+	}
+}

src/model.hpp

@@ -0,0 +1,19 @@
+#ifndef MODEL_HPP
+#define MODEL_HPP
+
+#include <vector>
+#include <modelpart.hpp>
+#include <cv.hpp>
+
+class Model {
+	std::vector<ModelPart> parts;
+
+	public:
+		Model(const char* path);
+
+		void draw();
+
+		void updateTransforms(struct FaceData faceData);
+};
+
+#endif

src/modelpart.cpp

@@ -1,5 +1,4 @@
 #include <GL/glew.h>
-
 #include <glm/mat4x4.hpp>
 #include <glm/gtc/type_ptr.hpp>
 
@@ -8,36 +7,72 @@
 
 #include <iostream>
 
-ModelPart::ModelPart() {
-}
+std::map<std::string, int> bindStringToNum {
+	{"null", BIND_NULL},
+	{"head", BIND_HEAD},
+	{"face", BIND_FACE},
+};
 
-ModelPart::ModelPart(const char* texPath, GLuint transUniformNum) {
+std::map<std::string, bool> triggerStringToNum {
+	{"null", TRIGGER_NULL},
+	{"mouth-open", TRIGGER_MOUTH_OPEN},
+};
+
+ModelPart::ModelPart() {
 	//create vbo, ebo, vao
 	initBuffers(&vao);
-	//create texture
-	initTexture(&tex[0], texPath);
-
-	transUniform = transUniformNum;
 
 	empty = false;
 }
 
 void ModelPart::bindAndDraw() {
-	if (empty) { return; }
 	glBindVertexArray(vao);
 	glBindTexture(GL_TEXTURE_2D, tex[texSelection]);
 	glUniformMatrix4fv(transUniform, 1, GL_FALSE, glm::value_ptr(transMatrix));
 	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 }
 
+void ModelPart::setBind(std::string bindName) {
+	bind = bindStringToNum[bindName];
+}
+
+void ModelPart::setFollowTarget(std::string followTarget) {
+	follow = bindStringToNum[followTarget];
+}
+
+void ModelPart::setFollowFactor(float followFactor) {
+	factor = followFactor;
+}
+
 void ModelPart::setTransform(glm::vec2 position, float rotation, float scale) {
 	transMatrix = glm::translate(glm::mat4(1.0f), glm::vec3(position.x, -position.y, 0.0f));
 	transMatrix = glm::rotate(transMatrix, rotation, glm::vec3(0.0f, 0.0f, 1.0f));
 	transMatrix = glm::scale(transMatrix, glm::vec3(scale, scale, scale));
 }
 
-void ModelPart::addTexture(const char* texPath, size_t slot) {
-	initTexture(&tex[slot], texPath);
+void ModelPart::processFaceData(struct FaceData faceData) {
+	// calculate position
+	glm::vec2 bindPosition = faceData.positions[bind];
+	glm::vec2 followPosition = faceData.positions[follow];
+	glm::vec2 followDirection = followPosition - bindPosition;
+	glm::vec2 newPosition = bindPosition + (followDirection * factor);
+
+	setTransform(newPosition, faceData.headRotation, faceData.scale);
+
+	// change textures
+	selectTexture(0);	// if none are triggered, use the first one
+	for (size_t i = 0; i < texCount; i++) {
+		if (faceData.triggers[texTriggers[i]]) {
+			selectTexture(i);
+			break;	// if several textures are triggered, the first one defined in model.toml will get priority
+		}
+	}
+}
+
+void ModelPart::addTexture(unsigned char* texBuffer, size_t texLength, size_t slot, std::string triggerName) {
+	initTexture(&tex[slot], texBuffer, texLength);
+	texTriggers[slot] = triggerStringToNum[triggerName];
+	texCount++;
 }
 
 void ModelPart::selectTexture(size_t slot) {

src/modelpart.hpp

@@ -1,29 +1,49 @@
 #ifndef MODELPART_HPP
 #define MODELPART_HPP
 
+#include <string>
+
 #include <glm/ext/matrix_transform.hpp>
+#include <graphics.hpp>
+#include <cv.hpp>
+
+#define BIND_NULL 0x00
+#define BIND_HEAD 0x01
+#define BIND_FACE 0x02
+
+#define TRIGGER_NULL		0x00
+#define TRIGGER_MOUTH_OPEN	0x01
 
 class ModelPart {
-	GLuint vao, transUniform;
+	GLuint vao;
 
 	GLuint tex[16];	//support 16 textures to switch between
+	int texTriggers[16];
 	size_t texSelection = 0;
+	size_t texCount = 0;
 
 	glm::mat4 transMatrix = glm::mat4(1.0f);
 
+	int bind = BIND_NULL;
+	int follow = BIND_NULL;
+	float factor = 0.0f;	//default factor of 0 so part will not follow a null by default
+
 	bool empty = true;
 	
 	public:
 		ModelPart();
 
-		ModelPart(const char* texPath, GLuint transUniformNum);
-
 		void bindAndDraw();
 
+		void setBind(std::string bindString);
+		void setFollowTarget(std::string followString);
+		void setFollowFactor(float followFactor);
+
 		void setTransform(glm::vec2 position, float rotation, float scale);
 
-		void addTexture(const char* texPath, size_t slot);
+		void processFaceData(struct FaceData faceData);
 
+		void addTexture(unsigned char* texBuffer, size_t texLength, size_t slot, std::string triggerName);
 		void selectTexture(size_t slot);
 };
 

src/toml.h

@@ -0,0 +1,175 @@
+/*
+  MIT License
+  
+  Copyright (c) 2017 - 2019 CK Tan
+  https://github.com/cktan/tomlc99
+  
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+  
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+  
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+#ifndef TOML_H
+#define TOML_H
+
+
+#include <stdio.h>
+#include <stdint.h>
+
+
+#ifdef __cplusplus
+#define TOML_EXTERN extern "C"
+#else
+#define TOML_EXTERN extern
+#endif
+
+typedef struct toml_timestamp_t toml_timestamp_t;
+typedef struct toml_table_t toml_table_t;
+typedef struct toml_array_t toml_array_t;
+typedef struct toml_datum_t toml_datum_t;
+
+/* Parse a file. Return a table on success, or 0 otherwise. 
+ * Caller must toml_free(the-return-value) after use.
+ */
+TOML_EXTERN toml_table_t* toml_parse_file(FILE* fp, 
+										  char* errbuf,
+										  int errbufsz);
+
+/* Parse a string containing the full config. 
+ * Return a table on success, or 0 otherwise.
+ * Caller must toml_free(the-return-value) after use.
+ */
+TOML_EXTERN toml_table_t* toml_parse(char* conf, /* NUL terminated, please. */
+									 char* errbuf,
+									 int errbufsz);
+
+/* Free the table returned by toml_parse() or toml_parse_file(). Once 
+ * this function is called, any handles accessed through this tab 
+ * directly or indirectly are no longer valid.
+ */
+TOML_EXTERN void toml_free(toml_table_t* tab);
+
+
+/* Timestamp types. The year, month, day, hour, minute, second, z 
+ * fields may be NULL if they are not relevant. e.g. In a DATE
+ * type, the hour, minute, second and z fields will be NULLs.
+ */
+struct toml_timestamp_t {
+	struct { /* internal. do not use. */
+		int year, month, day;
+		int hour, minute, second, millisec;
+		char z[10];
+	} __buffer;
+	int *year, *month, *day;
+	int *hour, *minute, *second, *millisec;
+	char* z;
+};
+
+
+/*-----------------------------------------------------------------
+ *  Enhanced access methods 
+ */
+struct toml_datum_t {
+	int ok;
+	union {
+		toml_timestamp_t* ts; /* ts must be freed after use */
+		char*   s; /* string value. s must be freed after use */
+		int     b; /* bool value */
+		int64_t i; /* int value */
+		double  d; /* double value */
+	} u;
+};
+
+/* on arrays: */
+/* ... retrieve size of array. */
+TOML_EXTERN int toml_array_nelem(const toml_array_t* arr);
+/* ... retrieve values using index. */
+TOML_EXTERN toml_datum_t toml_string_at(const toml_array_t* arr, int idx);
+TOML_EXTERN toml_datum_t toml_bool_at(const toml_array_t* arr, int idx);
+TOML_EXTERN toml_datum_t toml_int_at(const toml_array_t* arr, int idx);
+TOML_EXTERN toml_datum_t toml_double_at(const toml_array_t* arr, int idx);
+TOML_EXTERN toml_datum_t toml_timestamp_at(const toml_array_t* arr, int idx);
+/* ... retrieve array or table using index. */
+TOML_EXTERN toml_array_t* toml_array_at(const toml_array_t* arr, int idx);
+TOML_EXTERN toml_table_t* toml_table_at(const toml_array_t* arr, int idx);
+
+/* on tables: */
+/* ... retrieve the key in table at keyidx. Return 0 if out of range. */
+TOML_EXTERN const char* toml_key_in(const toml_table_t* tab, int keyidx);
+/* ... retrieve values using key. */
+TOML_EXTERN toml_datum_t toml_string_in(const toml_table_t* arr, const char* key);
+TOML_EXTERN toml_datum_t toml_bool_in(const toml_table_t* arr, const char* key);
+TOML_EXTERN toml_datum_t toml_int_in(const toml_table_t* arr, const char* key);
+TOML_EXTERN toml_datum_t toml_double_in(const toml_table_t* arr, const char* key);
+TOML_EXTERN toml_datum_t toml_timestamp_in(const toml_table_t* arr, const char* key);
+/* .. retrieve array or table using key. */
+TOML_EXTERN toml_array_t* toml_array_in(const toml_table_t* tab,
+										const char* key);
+TOML_EXTERN toml_table_t* toml_table_in(const toml_table_t* tab,
+										const char* key);
+
+/*-----------------------------------------------------------------
+ * lesser used 
+ */
+/* Return the array kind: 't'able, 'a'rray, 'v'alue */
+TOML_EXTERN char toml_array_kind(const toml_array_t* arr);
+
+/* For array kind 'v'alue, return the type of values 
+   i:int, d:double, b:bool, s:string, t:time, D:date, T:timestamp
+   0 if unknown
+*/
+TOML_EXTERN char toml_array_type(const toml_array_t* arr);
+
+/* Return the key of an array */
+TOML_EXTERN const char* toml_array_key(const toml_array_t* arr);
+
+/* Return the number of key-values in a table */
+TOML_EXTERN int toml_table_nkval(const toml_table_t* tab);
+
+/* Return the number of arrays in a table */
+TOML_EXTERN int toml_table_narr(const toml_table_t* tab);
+
+/* Return the number of sub-tables in a table */
+TOML_EXTERN int toml_table_ntab(const toml_table_t* tab);
+
+/* Return the key of a table*/
+TOML_EXTERN const char* toml_table_key(const toml_table_t* tab);
+
+/*--------------------------------------------------------------
+ * misc 
+ */
+TOML_EXTERN int toml_utf8_to_ucs(const char* orig, int len, int64_t* ret);
+TOML_EXTERN int toml_ucs_to_utf8(int64_t code, char buf[6]);
+TOML_EXTERN void toml_set_memutil(void* (*xxmalloc)(size_t),
+								  void	(*xxfree)(void*));
+
+
+/*--------------------------------------------------------------
+ *  deprecated 
+ */
+/* A raw value, must be processed by toml_rto* before using. */
+typedef const char* toml_raw_t;
+TOML_EXTERN toml_raw_t toml_raw_in(const toml_table_t* tab, const char* key);
+TOML_EXTERN toml_raw_t toml_raw_at(const toml_array_t* arr, int idx);
+TOML_EXTERN int toml_rtos(toml_raw_t s, char** ret);
+TOML_EXTERN int toml_rtob(toml_raw_t s, int* ret);
+TOML_EXTERN int toml_rtoi(toml_raw_t s, int64_t* ret);
+TOML_EXTERN int toml_rtod(toml_raw_t s, double* ret);
+TOML_EXTERN int toml_rtod_ex(toml_raw_t s, double* ret, char* buf, int buflen);
+TOML_EXTERN int toml_rtots(toml_raw_t s, toml_timestamp_t* ret);
+
+
+#endif /* TOML_H */

src/tomlcpp.cpp

@@ -0,0 +1,334 @@
+/*
+
+  MIT License
+
+  Copyright (c) 2020 CK Tan
+  https://github.com/cktan/tomlcpp
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+
+*/
+#include <memory>
+#include <vector>
+#include <string.h>
+#include <fstream>
+#include "tomlcpp.hpp"
+#include "toml.h"
+
+using namespace toml;
+using std::string;
+using std::vector;
+using std::pair;
+
+
+static void* toml_mymalloc(size_t sz)
+{
+	return new char[sz];
+}
+
+static void toml_myfree(void* p)
+{
+	if (p) {
+		char* pp = (char*) p;
+		delete[] pp;
+	}
+}
+
+
+
+/**
+ *  Keep track of memory to be freed when all references
+ *  to the tree returned by toml::parse is no longer reachable.
+ */
+struct toml::Backing {
+	char* ptr = 0;
+	toml_table_t* root = 0;
+	Backing(const string& conf) {
+		ptr = new char[conf.length() + 1];
+		strcpy(ptr, conf.c_str());
+	}
+	~Backing() {
+		if (ptr) delete[] ptr;
+		if (root) toml_free(root);
+	}
+};
+
+
+pair<bool, string> Table::getString(const string& key) const
+{
+	string str;
+	toml_datum_t p = toml_string_in(m_table, key.c_str());
+	if (p.ok) {
+		str = p.u.s;
+		toml_myfree(p.u.s);
+	}
+	return {p.ok, str};
+}
+
+pair<bool, bool> Table::getBool(const string& key) const
+{
+	toml_datum_t p = toml_bool_in(m_table, key.c_str());
+	return {p.ok, !!p.u.b};
+
+}
+
+pair<bool, int64_t> Table::getInt(const string& key) const
+{
+	toml_datum_t p = toml_int_in(m_table, key.c_str());
+	return {p.ok, p.u.i};
+}
+
+pair<bool, double> Table::getDouble(const string& key) const
+{
+	toml_datum_t p = toml_double_in(m_table, key.c_str());
+	return {p.ok, p.u.d};
+}
+
+pair<bool, Timestamp> Table::getTimestamp(const string& key) const
+{
+	Timestamp ret;
+	toml_datum_t p = toml_timestamp_in(m_table, key.c_str());
+	if (p.ok) {
+		toml_timestamp_t& ts = *p.u.ts;
+		ret.year = (ts.year ? *ts.year : -1);
+		ret.month = (ts.month ? *ts.month : -1);
+		ret.day = (ts.day ? *ts.day : -1);
+		ret.hour = (ts.hour ? *ts.hour : -1);
+		ret.second = (ts.second ? *ts.second : -1);
+		ret.millisec = (ts.millisec ? *ts.millisec : -1);
+		ret.z = ts.z ? string(ts.z) : "";
+		toml_myfree(p.u.ts);
+	}
+	return {p.ok, ret};
+}
+
+
+
+std::unique_ptr<Array> Table::getArray(const string& key) const
+{
+	toml_array_t* a = toml_array_in(m_table, key.c_str());
+	if (!a)
+		return 0;
+
+	auto ret = std::make_unique<Array>(a, m_backing);
+	return ret;
+}
+
+std::unique_ptr<Table> Table::getTable(const string& key) const
+{
+	toml_table_t* t = toml_table_in(m_table, key.c_str());
+	if (!t)
+		return 0;
+
+	auto ret = std::make_unique<Table>(t, m_backing);
+	return ret;
+}
+
+vector<string> Table::keys() const
+{
+	vector<string> vec;
+	for (int i = 0; ; i++) {
+		const char* k = toml_key_in(m_table, i);
+		if (!k) break;
+		vec.push_back(k);
+	}
+	return vec;
+}
+
+
+char Array::kind() const
+{
+	return toml_array_kind(m_array);
+}
+
+char Array::type() const
+{
+	return toml_array_type(m_array);
+}
+
+
+std::unique_ptr< vector<Array>> Array::getArrayVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<Array>>();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_array_t* a = toml_array_at(m_array, i);
+		if (!a)
+			return 0;
+
+		ret->push_back(Array(a, m_backing));
+	}
+
+	return ret;
+}
+
+std::unique_ptr< vector<Table>> Array::getTableVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<Table>>();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_table_t* t = toml_table_at(m_array, i);
+		if (!t)
+			return 0;
+
+		ret->push_back(Table(t, m_backing));
+	}
+
+	return ret;
+}
+
+std::unique_ptr< vector<string> > Array::getStringVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<string> >();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_datum_t p = toml_string_at(m_array, i);
+		if (!p.ok) return 0;
+		ret->push_back(p.u.s);
+		toml_myfree(p.u.s);
+	}
+
+	return ret;
+}
+
+
+std::unique_ptr< vector<bool> > Array::getBoolVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<bool> >();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_datum_t p = toml_bool_at(m_array, i);
+		if (!p.ok) return 0;
+		ret->push_back(!!p.u.b);
+	}
+
+	return ret;
+}
+
+
+std::unique_ptr< vector<int64_t> > Array::getIntVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<int64_t> >();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_datum_t p = toml_int_at(m_array, i);
+		if (!p.ok) return 0;
+		ret->push_back(p.u.i);
+	}
+
+	return ret;
+}
+
+
+std::unique_ptr< vector<Timestamp> > Array::getTimestampVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<Timestamp> >();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_datum_t p = toml_timestamp_at(m_array, i);
+		if (!p.ok) return 0;
+
+		toml_timestamp_t& ts = *p.u.ts;
+		Timestamp v;
+		v.year = (ts.year ? *ts.year : -1);
+		v.month = (ts.month ? *ts.month : -1);
+		v.day = (ts.day ? *ts.day : -1);
+		v.hour = (ts.hour ? *ts.hour : -1);
+		v.second = (ts.second ? *ts.second : -1);
+		v.millisec = (ts.millisec ? *ts.millisec : -1);
+		v.z = ts.z ? string(ts.z) : "";
+		toml_myfree(p.u.ts);
+
+		ret->push_back(v);
+	}
+
+	return ret;
+}
+
+
+std::unique_ptr< vector<double> > Array::getDoubleVector() const
+{
+	int top = toml_array_nelem(m_array);
+	if (top < 0) return 0;
+
+	auto ret = std::make_unique< vector<double> >();
+	ret->reserve(top);
+	for (int i = 0; i < top; i++) {
+		toml_datum_t p = toml_double_at(m_array, i);
+		if (!p.ok) return 0;
+		ret->push_back(p.u.d);
+	}
+
+	return ret;
+}
+
+
+int toml::Array::size() const
+{
+	return toml_array_nelem(m_array);
+}
+
+
+toml::Result toml::parse(const string& conf)
+{
+	toml::Result ret;
+	char errbuf[200];
+	auto backing = std::make_shared<Backing>(conf);
+
+	toml_set_memutil(toml_mymalloc, toml_myfree);
+	toml_table_t* t = toml_parse(backing->ptr, errbuf, sizeof(errbuf));
+	if (t) {
+		ret.table = std::make_shared<Table>(t, backing);
+		backing->root = t;
+	} else {
+		ret.errmsg = (*errbuf) ? string(errbuf) : "unknown error";
+	}
+	return ret;
+}
+
+
+toml::Result toml::parseFile(const string& path)
+{
+	toml::Result ret;
+	std::ifstream stream(path);
+	if (!stream) {
+		ret.errmsg = strerror(errno);
+		return ret;
+	}
+	string conf(std::istreambuf_iterator<char>{stream}, {});
+	return toml::parse(conf);
+}

src/tomlcpp.hpp

@@ -0,0 +1,128 @@
+/*
+  MIT License
+  
+  Copyright (c) 2020 CK Tan
+  https://github.com/cktan/tomlcpp
+  
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+  
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+  
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+#ifndef TOML_HPP
+#define TOML_HPP
+
+#include <memory>
+
+struct toml_table_t;
+struct toml_array_t;
+
+namespace toml {
+
+	struct Backing;
+	class Array;
+	class Table;
+	using std::pair;
+	using std::string;
+	using std::vector;
+
+	/* A Timestamp value */
+	struct Timestamp {
+		// -1 means it is not valid
+		int year = -1;
+		int month = -1;
+		int day = -1;
+		int hour = -1;
+		int minute = -1;
+		int second = -1;
+		int millisec = -1;
+		string z;			// "" if no timezone
+	};
+
+	/* A table in toml. You can extract value/table/array using a key. */
+	class Table {
+		public:
+		vector<string> keys() const;
+
+		// get content
+		pair<bool, string>     getString(const string& key) const;
+		pair<bool, bool>       getBool(const string& key) const;
+		pair<bool, int64_t>    getInt(const string& key) const;
+		pair<bool, double>     getDouble(const string& key) const;
+		pair<bool, Timestamp>  getTimestamp(const string& key) const;
+		std::unique_ptr<Table> getTable(const string& key) const;
+		std::unique_ptr<Array> getArray(const string& key) const;
+
+		// internal
+		Table(toml_table_t* t, std::shared_ptr<Backing> backing) : m_table(t), m_backing(backing) {}
+		
+		private:
+		toml_table_t* const m_table = 0;
+		std::shared_ptr<Backing> m_backing;
+		
+		Table() = delete;
+	};
+
+
+	/* An array in toml. You can extract value/table/array using an index. */
+	class Array {
+		public:
+
+		// Content kind
+		// t:table, a:array, v:value
+		char kind() const;
+
+		// For Value kind only, check the type of the value
+		// i:int, d:double, b:bool, s:string, t:time, D: date, T:timestamp, 0:unknown
+		char type() const;
+
+		// Return the #elements in the array
+		int size() const;
+
+		// For values, some conveniet methods to obtain vector of values
+		std::unique_ptr< vector<string> >     getStringVector() const;
+		std::unique_ptr< vector<bool> >       getBoolVector() const;
+		std::unique_ptr< vector<int64_t> >    getIntVector() const;
+		std::unique_ptr< vector<double> >     getDoubleVector() const;
+		std::unique_ptr< vector<Timestamp> >  getTimestampVector() const;
+
+		// Obtain vectors of table or array
+		std::unique_ptr< vector<Table>> getTableVector() const;
+		std::unique_ptr< vector<Array>> getArrayVector() const;
+
+		// internal
+		Array(toml_array_t* a, std::shared_ptr<Backing> backing) : m_array(a), m_backing(backing) {}
+		
+		private:
+		toml_array_t* const m_array = 0;
+		std::shared_ptr<Backing> m_backing;
+		
+		Array() = delete;
+	};
+
+
+	/* The main function: Parse */
+	struct Result {
+		std::shared_ptr<Table> table;
+		string errmsg;
+	};
+
+	Result parse(const string& conf);
+	Result parseFile(const string& path);
+};
+
+
+#endif /* TOML_HPP */