ID3v1.cpp

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#include <dcl/Config.h>
 
#include <string.h>
 
#if __DCL_WINDOWS
#include <windows.h>
#endif
 
#include <dcl/String.h>
#include <dcl/Charset.h>
#include <dcl/File.h>
 
#include "ID3v1.h"
 
#define __TRACE_THIS    0
#if __TRACE_THIS
#define __DCL_TRACE1_N  __DCL_TRACE1
#define __DCL_TRACE2_N  __DCL_TRACE2
#define __DCL_TRACE3_N  __DCL_TRACE3
#else
#define __DCL_TRACE1_N(fmt, arg)
#define __DCL_TRACE2_N(fmt, arg1, arg2)
#define __DCL_TRACE3_N(fmt, arg1, arg2, arg3)
#endif
 
__DCL_BEGIN_NAMESPACE
 
#if __DCL_DEBUG
#undef __THIS_FILE__
static const char_t __THIS_FILE__[] = __T("media/ID3v1.cpp");
#endif
 
IMPLEMENT_CLASSINFO(ID3v1, Object)
 
ID3v1::ID3v1()
    : __version(0), __track(0), __genre(0)
{
}
 
struct __ID3v1
{
    char TAG[3];
    char Title[30];
    char Artist[30];
    char Album[30];
    char Year[4];
    char Comment[30];
    char Genre;
};
 
bool ID3v1::read(File& _file)
{
    __DCL_ASSERT(sizeof(__ID3v1) == 128);
    // 파일의 마지막 128 bytes를 읽는다.
    _file.seek(-128, File::END);
    char buf[128];
    size_t n = _file.read(&buf, sizeof(buf));
 
    __DCL_TRACE2_N(L"read [%zd] [%ls]\n", n,
        String::tryString(buf, 128).data());
 
    if (memcmp(buf, "TAG", 3) != 0) {
        return false;
    }
 
    return read(buf);
}
 
bool ID3v1::read(const char _data[128])
{
    __DCL_ASSERT(_data != NULL);
    __DCL_TRACE1_N(L"[%ls]\n", String::tryString(_data, 128).data());
    if (memcmp(_data, "TAG", 3) != 0) {
        return false;
    }
    __version = 1;
 
    __ID3v1& buf = *(__ID3v1*)_data;
    __TAG = AsciiDecoder::decode(buf.TAG, 3);
    __title = Latin1Decoder::decode(buf.Title, ByteString::length(buf.Title, sizeof(buf.Title)));
    __artist = Latin1Decoder::decode(buf.Artist, ByteString::length(buf.Artist, sizeof(buf.Artist)));
    __album = Latin1Decoder::decode(buf.Album, ByteString::length(buf.Album, sizeof(buf.Album)));
    __year = Latin1Decoder::decode(buf.Year, ByteString::length(buf.Year, sizeof(buf.Year)));
    __comment = Latin1Decoder::decode(buf.Comment, ByteString::length(buf.Comment, sizeof(buf.Comment)));
 
    if (__comment.length() <= 28) {
        __track = buf.Comment[29];
    }
    __genre = buf.Genre;
 
    __title = __title.trim();
    __artist = __artist.trim();
    __album = __album.trim();
    __year = __year.trim();
    __comment = __comment.trim();
 
    return true;
}
 
String ID3v1::toString() const
{
    return String::format(L""
        "%ls "
        "Title[%ls] Artist[%ls] Album[%ls] Year[%ls] Comment[%ls]"
        " Track[%d] Genre[%d]",
        __TAG.data(),
        __title.data(), __artist.data(), __album.data(), __year.data(), __comment.data(),
        __track, __genre);
}
 
__DCL_END_NAMESPACE