From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 4 Aug 2023 02:14:45 +0000 (-0400)
Subject: example.c: switch back to the stream-based file API.
X-Git-Tag: 0.0.1~48
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=6b08d4c36787505216607ecee1ad433ff72816b6;p=libsvgtiny-pixbuf.git

example.c: switch back to the stream-based file API.

GdkPixbuf's module->load function takes a FILE* and not a path (or
descriptor), so let's go back to that.
---

diff --git a/example.c b/example.c
index 3dab2ba..bc09e4c 100644
--- a/example.c
+++ b/example.c
@@ -1,8 +1,5 @@
-#include <fcntl.h> /* open */
-#include <stdio.h> /* printf, fprintf */
+#include <stdio.h> /* fopen, fprintf, fread, printf */
 #include <stdlib.h> /* malloc */
-#include <sys/stat.h> /* fstat */
-#include <unistd.h> /* read */
 
 #include <cairo.h>
 #include <gdk/gdk.h>
@@ -73,35 +70,25 @@ void render_path(cairo_t *cr, struct svgtiny_shape *path) {
 /*
  * @brief Parse an SVG file into a diagram_t structure.
  *
- * @param path
- *   The path to the SVG file.
+ * @param fp
+ *   A pointer to an open file stream.
  *
  * @return If successful, a pointer to a @c diagram_t structure is
  *   returned; if not, @c NULL is returned. You are expected to @c
  *   svgtiny_free the result if it is valid.
  */
-diagram_t* svgtiny_diagram_from_path(char* path, int width, int height) {
+diagram_t* svgtiny_diagram_from_file(FILE* fp, int width, int height) {
   diagram_t *diagram;
 
-  int fd;
   size_t bytecount;
   char *buffer;
   size_t bytesread;
-  struct stat sb;
   svgtiny_code code;
 
-  /* load file into memory buffer */
-  fd = open(path, O_RDONLY);
-  if (fd == -1) {
-    perror(path);
-    return NULL;
-  }
-
-  if (fstat(fd, &sb)) {
-    perror(path);
-    return NULL;
-  }
-  bytecount = sb.st_size;
+  /* Find the size of the file stream */
+  fseek(fp, 0L, SEEK_END);
+  bytecount = ftell(fp);
+  rewind(fp);
 
   buffer = malloc(bytecount);
   if (!buffer) {
@@ -109,22 +96,21 @@ diagram_t* svgtiny_diagram_from_path(char* path, int width, int height) {
     return NULL;
   }
 
-  bytesread = read(fd, buffer, bytecount);
+  bytesread = fread(buffer, 1, bytecount, fp);
   if (bytesread != bytecount) {
-    perror(path);
-    return NULL;
+    fprintf(stderr, "Read only %zd of %zd bytes from stream\n",
+	    bytesread,
+	    bytecount);
   }
-  close(fd);
-
+  fclose(fp);
 
-  /* create svgtiny object */
   diagram = svgtiny_create();
   if (!diagram) {
     fprintf(stderr, "svgtiny_create() failed\n");
     return NULL;
   }
 
-  code = svgtiny_parse(diagram, buffer, bytecount, path, width, height);
+  code = svgtiny_parse(diagram, buffer, bytecount, "", width, height);
   free(buffer);
 
   if (code != svgtiny_OK) {
@@ -247,6 +233,7 @@ int main(int argc, char** argv) {
   char* svgpath;
   char* pngpath;
   int pngwidth = 1024, pngheight = 1024;
+  FILE* fp;
 
   diagram_t* diagram;
   cairo_t *cr = 0;
@@ -263,7 +250,13 @@ int main(int argc, char** argv) {
   svgpath = argv[1];
   pngpath = argv[2];
 
-  diagram = svgtiny_diagram_from_path(svgpath, pngwidth, pngheight);
+  fp = fopen(svgpath, "rb");
+  if (!fp) {
+    perror(svgpath);
+    return 1;
+  }
+
+  diagram = svgtiny_diagram_from_file(fp, pngwidth, pngheight);
   if (!diagram) {
     return 1;
   }