Support large files over 2GB on Windows (#1089)

Backport of 4dcf0b41c6
b01f45e141
https://github.com/taglib/taglib/pull/77

Tested with files larger than 2GB which have been created using

sox -n -r 44100 -C 320 large.mp3 synth 58916 sine 440 channels 2
sox -n -r 44100 -C 0 large.flac synth 25459 sine 440 channels 2
sox -n -r 44100 -C 10 large.ogg synth 229806 sine 440 channels 2
sox -n -r 44100 large.wav synth 6692 sine 440 channels 2
ffmpeg -f lavfi -i "sine=frequency=440:duration=244676" -y large.m4a

The only file which was readable with the tagreader example
before this commit was large.ogg. The problem is that long on
Windows is only 32-bit (also in LLP64 data model of 64-bit
compilation target) and all the file offsets using long are
too small for large files. Now long is replaced by offset_t
(defined to be long long on Windows and off_t on UNIX) for such
cases and some unsigned long are now size_t, which has the
correct size even on Windows.

taglib/mpc/mpcfile.cpp

@@ -61,13 +61,13 @@ public:
     delete properties;
   }
 
-  long APELocation;
+  offset_t APELocation;
   long APESize;
 
-  long ID3v1Location;
+  offset_t ID3v1Location;
 
   ID3v2::Header *ID3v2Header;
-  long ID3v2Location;
+  offset_t ID3v2Location;
   long ID3v2Size;
 
   TagUnion tag;
@@ -310,7 +310,7 @@ void MPC::File::read(bool readProperties)
 
   if(readProperties) {
 
-    long streamLength;
+    offset_t streamLength;
 
     if(d->APELocation >= 0)
       streamLength = d->APELocation;

taglib/mpc/mpcproperties.cpp

@@ -66,14 +66,14 @@ public:
 // public members
 ////////////////////////////////////////////////////////////////////////////////
 
-MPC::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) :
+MPC::Properties::Properties(const ByteVector &data, offset_t streamLength, ReadStyle style) :
   AudioProperties(style),
   d(new PropertiesPrivate())
 {
   readSV7(data, streamLength);
 }
 
-MPC::Properties::Properties(File *file, long streamLength, ReadStyle style) :
+MPC::Properties::Properties(File *file, offset_t streamLength, ReadStyle style) :
   AudioProperties(style),
   d(new PropertiesPrivate())
 {
@@ -203,7 +203,7 @@ namespace
   const unsigned short sftable [8] = { 44100, 48000, 37800, 32000, 0, 0, 0, 0 };
 }  // namespace
 
-void MPC::Properties::readSV8(File *file, long streamLength)
+void MPC::Properties::readSV8(File *file, offset_t streamLength)
 {
   bool readSH = false, readRG = false;
 
@@ -295,7 +295,7 @@ void MPC::Properties::readSV8(File *file, long streamLength)
   }
 }
 
-void MPC::Properties::readSV7(const ByteVector &data, long streamLength)
+void MPC::Properties::readSV7(const ByteVector &data, offset_t streamLength)
 {
   if(data.startsWith("MP+")) {
     if(data.size() < 4)

taglib/mpc/mpcproperties.h

@@ -26,6 +26,7 @@
 #ifndef TAGLIB_MPCPROPERTIES_H
 #define TAGLIB_MPCPROPERTIES_H
 
+#include "tbytevector.h"
 #include "taglib_export.h"
 #include "audioproperties.h"
 
@@ -53,13 +54,13 @@ namespace TagLib {
        *
        * This constructor is deprecated. It only works for MPC version up to 7.
        */
-      Properties(const ByteVector &data, long streamLength, ReadStyle style = Average);
+      Properties(const ByteVector &data, offset_t streamLength, ReadStyle style = Average);
 
       /*!
        * Create an instance of MPC::Properties with the data read directly
        * from a MPC::File.
        */
-      Properties(File *file, long streamLength, ReadStyle style = Average);
+      Properties(File *file, offset_t streamLength, ReadStyle style = Average);
 
       /*!
        * Destroys this MPC::Properties instance.
@@ -146,8 +147,8 @@ namespace TagLib {
       Properties(const Properties &);
       Properties &operator=(const Properties &);
 
-      void readSV7(const ByteVector &data, long streamLength);
-      void readSV8(File *file, long streamLength);
+      void readSV7(const ByteVector &data, offset_t streamLength);
+      void readSV8(File *file, offset_t streamLength);
 
       class PropertiesPrivate;
       PropertiesPrivate *d;