Testing PNG writing.

guacamole/proxy/Makefile

@@ -4,7 +4,7 @@
 all: guacd
 
 guacd: daemon.o proxy.o
-	$(CC) daemon.o proxy.o -o guacd 
+	$(CC) daemon.o proxy.o -l png -o guacd 
 
 proxy.o: proxy.c proxy.h
 	$(CC) -c -ansi -pedantic proxy.c

guacamole/proxy/proxy.c

@@ -1,11 +1,106 @@
 
 #include <stdio.h>
+#include <png.h>
 
 #include "proxy.h"
 
-void proxy(int client_fd) {
+struct guac_write_info {
+    int client_fd;
+};
 
-    write(client_fd, "name:hello;size:1024,768;error:Test finished.;", 46);
+void guac_write_png(png_structp png, png_bytep data, png_size_t length) {
+
+    int client_fd;
+
+    client_fd = ((struct guac_write_info*) png->io_ptr)->client_fd;
+
+    /* TODO: */
+    /* write_base64(client_fd, data, length); */
+
+}
+
+void guac_write_flush(png_structp png) {
+    printf("HERE!\n");
+}
+
+void proxy(int client_fd) {
+
+    struct guac_write_info write_info;
+
+    png_structp png;
+    png_infop png_info;
+    png_byte** png_rows;
+    png_byte* row;
+
+    int x, y;
+
+    /* Set up PNG writer */
+    png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if (!png) {
+        perror("Error initializing libpng write structure");
+        return;
+    }
+
+    png_info = png_create_info_struct(png);
+    if (!png_info) {
+        perror("Error initializing libpng info structure");
+        png_destroy_write_struct(&png, NULL);
+        return;
+    }
+
+    /* Set error handler */
+    if (setjmp(png_jmpbuf(png))) {
+        perror("Error setting handler");
+        png_destroy_write_struct(&png, &png_info);
+        return;
+    }
+
+    /* Set PNG IHDR */
+    png_set_IHDR(
+            png,
+            png_info,
+            100, /* width */
+            100, /* height */
+            8,
+            PNG_COLOR_TYPE_RGB,
+            PNG_INTERLACE_NONE,
+            PNG_COMPRESSION_TYPE_DEFAULT,
+            PNG_FILTER_TYPE_DEFAULT
+    );
+
+    /* Allocate rows for PNG */
+    png_rows = png_malloc(png, 100 /* height */ * sizeof(png_byte*));
+
+    write_info.client_fd = client_fd;
+    png_set_write_fn(png, &write_info, guac_write_png, guac_write_flush);
+
+    /*** CREATE AND WRITE IMAGE ***/
+
+    /* For now, generate test white image */
+    for (y=0; y<100 /* height */; y++) {
+
+        row = (png_byte*) png_malloc(png, sizeof(png_byte) * 3 * 100 /* width */);
+        png_rows[y] = row;
+
+        for (x=0; x<100 /* width */; x++) {
+            *row++ = 0xFF;
+            *row++ = 0xFF;
+            *row++ = 0xFF;
+        }
+    }
+
+
+    png_set_rows(png, png_info, png_rows);
+    png_write_png(png, png_info, PNG_TRANSFORM_IDENTITY, NULL);
+
+    write(client_fd, "name:hello;size:1024,768;error:Test finished.;", 46);
+
+    /* Free PNG data */
+    for (y = 0; y<100 /* height */; y++)
+        png_free(png, png_rows[y]);
+    png_free(png, png_rows);
+
+    png_destroy_write_struct(&png, &png_info);
 
 }