o add my bsnes branch

tools/bsnes/reader/gzreader.cpp

@@ -0,0 +1,85 @@
+#ifdef READER_CPP
+
+#include "gzreader.hpp"
+
+unsigned GZReader::size() {
+  return filesize;
+}
+
+//This function will allocate memory even if open() fails.
+//This is needed so that when SRAM files do not exist, the
+//memory for the SRAM data will be allocated still.
+//The memory is flushed to 0x00 when no file is opened.
+uint8_t* GZReader::read(unsigned length) {
+  uint8_t *data = 0;
+
+  if(length == 0) {
+    //read the entire file into RAM
+    data = new(zeromemory) uint8_t[filesize];
+    if(gp) gzread(gp, data, filesize);
+  } else if(length > filesize) {
+    //read the entire file into RAM, pad the rest with 0x00s
+    data = new(zeromemory) uint8_t[length];
+    if(gp) gzread(gp, data, filesize);
+  } else { //filesize >= length
+    //read only what was requested
+    data = new(zeromemory) uint8_t[length];
+    if(gp) gzread(gp, data, length);
+  }
+
+  return data;
+}
+
+bool GZReader::ready() {
+  return (gp != 0);
+}
+
+GZReader::GZReader(const char *fn) : gp(0) {
+  #if !defined(_WIN32)
+  fp = fopen(fn, "rb");
+  #else
+  fp = _wfopen(utf16_t(fn), L"rb");
+  #endif
+  if(!fp) return;
+
+  fseek(fp, 0, SEEK_END);
+  filesize = ftell(fp);
+
+  if(filesize < 4) {
+    //too small to be a valid GZ archive
+    fclose(fp);
+    fp = 0;
+    return;
+  }
+
+  fseek(fp, -4, SEEK_END);
+  unsigned gzsize;
+  gzsize  = fgetc(fp);
+  gzsize |= fgetc(fp) << 8;
+  gzsize |= fgetc(fp) << 16;
+  gzsize |= fgetc(fp) << 24;
+  fseek(fp, 0, SEEK_SET);
+
+  //zlib does not support UTF-8 filenames on Windows,
+  //thus _wfopen() wrapper above + fileno() wrapper here.
+  gp = gzdopen(fileno(fp), "rb");
+  if(!gp) return;
+
+  if(gzdirect(gp) == false) filesize = gzsize;
+
+  if(filesize == 0) {
+    //archive is empty
+    gzclose(gp);
+    gp = 0;
+    return;
+  }
+}
+
+GZReader::~GZReader() {
+  if(gp) {
+    gzclose(gp);
+    gp = 0;
+  }
+}
+
+#endif //ifdef READER_CPP