neotools: code fixup & vgz support

neotools/neoadpcmextract.h

@@ -1,12 +1,38 @@
-#ifndef __NEOADPCMEXTRACT_H__
-#define __NEOADPCMEXTRACT_H__
+#ifndef NEOADPCMEXTRACT_H
+#define NEOADPCMEXTRACT_H
 
 #include <stdio.h>
 #include <stdint.h>
+#include <stdbool.h>
+
+#if USE_ZLIB
+#include <zlib.h>
+typedef struct gzFile_s nfile;
+#  define nopen gzopen
+#  define nclose gzclose
+#  define nread gzfread
+#  define ngetc gzgetc
+#  define nseek gzseek
+#  define ntell gztell
+#  define neof gzeof
+static inline int nerror(gzFile file) { int err; gzerror(file, &err); return err; }
+#else
+typedef FILE nfile;
+#  define nopen fopen
+#  define nclose fclose
+#  define nread fread
+#  define ngetc fgetc
+#  define nseek fseek
+#  define ntell ftell
+#  define neof feof
+#  define nerror ferror
+#endif
 
 typedef struct { uint8_t* data; size_t size, reserved; } Buffer;
 
-int vgmReadSample(FILE* fin, Buffer* buf);
-int vgmScanSample(FILE* file);
+bool bufferResize(Buffer* buf, size_t size);
 
-#endif//__NEOADPCMEXTRACT_H__
+int vgmReadSample(nfile* restrict fin, Buffer* restrict buf);
+int vgmScanSample(nfile* file);
+
+#endif//NEOADPCMEXTRACT_H