Cleanup, make pnmtopng.c compile with libpng 1.4 beta, split out pngx.c

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@968 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 29 insertions, 0 deletions

diff --git a/converter/other/pngx.h b/converter/other/pngx.h
new file mode 100644
index 00000000..81487ca1
--- /dev/null
+++ b/converter/other/pngx.h
@@ -0,0 +1,29 @@
+#ifndef PNGX_H_INCLUDED
+#define PNGX_H_INCLUDED
+
+/* pngx is designed to be an extension of the PNG library to make using
+   the PNG library easier and cleaner.
+*/
+
+struct pngx {
+    png_structp png_ptr;
+    png_infop info_ptr;
+};
+
+typedef enum {PNGX_READ, PNGX_WRITE} pngx_rw;
+
+
+void
+pngx_create(struct pngx ** const pngxPP,
+            pngx_rw        const rw,
+            jmp_buf *      const jmpbufP);
+
+void
+pngx_destroy(struct pngx * const pngxP);
+
+
+bool
+pngx_chunkIsPresent(struct pngx * const pngxP,
+                    uint32_t      const chunkType);
+
+#endif