initial commit

took me a day to make the base...
...and ~12 hours to write a reader that reads 100% of all demo songs in
1.0

src/engine/safeReader.cpp

@@ -0,0 +1,143 @@
+#include "safeReader.h"
+#include "../ta-log.h"
+
+//#define READ_DEBUG
+
+bool SafeReader::seek(ssize_t where, int whence) {
+  switch (whence) {
+    case SEEK_SET:
+      if (where<0) return false;
+      if (where>(ssize_t)len) return false;
+      curSeek=where;
+      break;
+    case SEEK_CUR: {
+      ssize_t finalSeek=len+where;
+      if (finalSeek<0) return false;
+      if (finalSeek>(ssize_t)len) return false;
+      curSeek=finalSeek;
+      break;
+    }
+    case SEEK_END: {
+      ssize_t finalSeek=len-where;
+      if (finalSeek<0) return false;
+      if (finalSeek>(ssize_t)len) return false;
+      curSeek=finalSeek;
+      break;
+    }
+  }
+  return true;
+}
+
+size_t SafeReader::tell() {
+  return curSeek;
+}
+
+size_t SafeReader::size() {
+  return len;
+}
+
+int SafeReader::read(void* where, size_t count) {
+#ifdef READ_DEBUG
+  logD("SR: reading %d bytes at %x\n",count,curSeek);
+#endif
+  if (count==0) return 0;
+  if (curSeek+count>len) throw EndOfFileException(this,len);
+  memcpy(where,&buf[curSeek],count);
+  curSeek+=count;
+  return count;
+}
+
+char SafeReader::readC() {
+#ifdef READ_DEBUG
+  logD("SR: reading char %x:\n",curSeek);
+#endif
+  if (curSeek+1>len) throw EndOfFileException(this,len);
+#ifdef READ_DEBUG
+  logD("SR: %.2x\n",buf[curSeek]);
+#endif
+  return (signed char)buf[curSeek++];
+}
+
+short SafeReader::readS() {
+#ifdef READ_DEBUG
+  logD("SR: reading short %x:\n",curSeek);
+#endif
+  if (curSeek+2>len) throw EndOfFileException(this,len);
+  short ret=*(short*)(&buf[curSeek]);
+#ifdef READ_DEBUG
+  logD("SR: %.4x\n",ret);
+#endif
+  curSeek+=2;
+  return ret;
+}
+
+short SafeReader::readS_BE() {
+  if (curSeek+1>len) throw EndOfFileException(this,len);
+  short ret=*(short*)(&buf[curSeek]);
+  curSeek+=2;
+  return (ret>>8)|((ret&0xff)<<8);
+}
+
+int SafeReader::readI() {
+#ifdef READ_DEBUG
+  logD("SR: reading int %x:\n",curSeek);
+#endif
+  if (curSeek+4>len) throw EndOfFileException(this,len);
+  int ret=*(int*)(&buf[curSeek]);
+  curSeek+=4;
+#ifdef READ_DEBUG
+  logD("SR: %.8x\n",ret);
+#endif
+  return ret;
+}
+
+int SafeReader::readI_BE() {
+  if (curSeek+4>len) throw EndOfFileException(this,len);
+  int ret=*(int*)(&buf[curSeek]);
+  curSeek+=4;
+  return (ret>>24)|((ret&0xff0000)>>8)|((ret&0xff00)<<8)|((ret&0xff)<<24);
+}
+
+int64_t SafeReader::readL() {
+  if (curSeek+8>len) throw EndOfFileException(this,len);
+  int64_t ret=*(int64_t*)(&buf[curSeek]);
+  curSeek+=8;
+  return ret;
+}
+
+float SafeReader::readF() {
+  if (curSeek+4>len) throw EndOfFileException(this,len);
+  float ret=*(float*)(&buf[curSeek]);
+  curSeek+=4;
+  return ret;
+}
+
+double SafeReader::readD() {
+  if (curSeek+8>len) throw EndOfFileException(this,len);
+  double ret=*(double*)(&buf[curSeek]);
+  curSeek+=8;
+  return ret;
+}
+
+String SafeReader::readString(size_t stlen) {
+  String ret;
+#ifdef READ_DEBUG
+  logD("SR: reading string len %d at %x\n",stlen,curSeek);
+#endif
+  size_t curPos=0;
+  while (curPos<stlen) {
+    char c=readC();
+    if (c!=0) ret.push_back(c);
+    curPos++;
+  }
+  return ret;
+}
+
+String SafeReader::readString() {
+  String ret;
+  char c;
+  while ((c=readC())!=0) {
+    ret.push_back(c);
+  }
+  return ret;
+}