Add game info class and structure

Makefile

@@ -1,4 +1,5 @@
-OBJS=menu.oo main.oo utils.oo gui.oo dialogue_box.oo menu_messages.oo timer.oo
+OBJS=menu.oo main.oo utils.oo gui.oo dialogue_box.oo menu_messages.oo \
+	timer.oo game_info.oo
 
 all: menu
 
@@ -7,10 +8,12 @@ all: menu
 
 menu.oo: menu.cpp menu.hh utils.hh font.hh Makefile
 
-gui.oo: Makefile gui.cpp gui.hh font.hh menu.hh sdl_ttf_font.hh \
+gui.oo: gui.cpp gui.hh Makefile font.hh menu.hh sdl_ttf_font.hh \
 	dialogue_box.hh help_box.hh main_menu.cpp disc_menu.cpp \
 	file_browser.hh timer.hh
 
+game_info.oo: game_info.hh game_info.cpp
+
 utils.oo: utils.cpp utils.hh Makefile
 
 timer.oo: timer.cpp timer.hh utils.hh Makefile

game_info.cpp

@@ -0,0 +1,98 @@
+#include <arpa/inet.h>
+#include <SDL.h>
+#include <SDL_image.h>
+
+#include "game_info.hh"
+#include "utils.hh"
+
+GameInfo::GameInfo()
+{
+	this->name = NULL;
+	this->author = NULL;
+	this->screenshot = NULL;
+}
+
+GameInfo::~GameInfo()
+{
+	this->resetDefaults();
+}
+
+void GameInfo::resetDefaults()
+{
+	free(this->name);
+	free(this->author);
+	SDL_FreeSurface(this->screenshot);
+
+	this->name = NULL;
+	this->author = NULL;
+	this->screenshot = NULL;
+}
+
+struct game_info *GameInfo::dump(size_t *out_sz)
+{
+	size_t total_sz = sizeof(struct game_info);
+	size_t png_sz;
+	struct game_info *out;
+	void *png_data;
+
+	if (this->screenshot)
+		return NULL;
+
+	/* Convert surface to PNG */
+	png_data = sdl_surface_to_png(this->screenshot, &png_sz);
+	panic_if(!png_data, "Cannot create PNG from surface\n");
+
+	total_sz += strlen(this->author) + 1;
+	total_sz += strlen(this->name) + 1;
+
+	total_sz += png_sz;
+	/* 4-byte align */
+	total_sz += 4 - (total_sz & 3);
+
+	/* Allocate everything */
+	out = (struct game_info*)xmalloc(total_sz);
+	out->sz = total_sz;
+	out->dummy = 0;
+	out->author_off = 0; /* Starts AFTER the header */
+	out->name_off = out->author_off + strlen(this->author) + 1;
+	out->screenshot_off = out->name_off + strlen(this->name) + 1;
+
+	memcpy(out->data + out->author_off, this->author, strlen(this->author) + 1);
+	memcpy(out->data + out->name_off, this->name, strlen(this->name) + 1);
+	memcpy(out->data + out->screenshot_off, png_data, png_sz);
+
+	out->sz = htonl(out->sz);
+	out->author_off = htons(out->author_off);
+	out->name_off = htons(out->name_off);
+	out->screenshot_off = htons(out->screenshot_off);
+
+	return out;
+}
+
+void GameInfo::fromDump(struct game_info *gi, size_t sz)
+{
+	SDL_RWops *rw;
+
+	gi->sz = ntohl(gi->sz);
+	gi->author_off = ntohs(gi->author_off);
+	gi->name_off = ntohs(gi->name_off);
+	gi->screenshot_off = ntohs(gi->screenshot_off);
+
+	this->author = xstrdup((char*)gi->data + gi->author_off);
+	this->name = xstrdup((char*)gi->data + gi->name_off);
+
+	rw = SDL_RWFromMem(gi->data + gi->screenshot_off,
+			gi->sz - gi->screenshot_off);
+	if (!rw)
+		goto bail_out;
+
+	this->screenshot = IMG_Load_RW(rw, 0);
+	SDL_FreeRW(rw);
+	if (!this->screenshot)
+		goto bail_out;
+
+	return;
+
+bail_out:
+	this->resetDefaults();
+}

game_info.hh

@@ -0,0 +1,37 @@
+#ifndef __GAME_INFO_HH__
+#define __GAME_INFO_HH__
+
+#include <SDL.h>
+
+struct game_info
+{
+	uint32_t sz;
+	uint16_t author_off;
+	uint16_t name_off;
+	uint16_t screenshot_off; /* In PNG format */
+	uint16_t dummy;
+	uint8_t data[]; /* 4-byte aligned */
+};
+
+class GameInfo
+{
+public:
+	GameInfo();
+
+	~GameInfo();
+
+	void resetDefaults();
+
+	/** Returns an allocated dump structure */
+	struct game_info *dump(size_t *out_sz);
+
+	/** Fill in this game info object from a structure */
+	void fromDump(struct game_info *data, size_t sz);
+
+protected:
+	char *name;
+	char *author;
+	SDL_Surface *screenshot;
+};
+
+#endif /*__GAME_INFO_HH__ */