file_info_const_impl.cpp

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#include "stdafx.h"

// presorted - do not change without a proper strcmp resort
static const char * const standard_fieldnames[] = {
    "ALBUM","ALBUM ARTIST","ARTIST","Album","Album Artist","Artist","COMMENT","Comment","DATE","DISCNUMBER","Date",
    "Discnumber","GENRE","Genre","TITLE","TOTALTRACKS","TRACKNUMBER","Title","TotalTracks","Totaltracks","TrackNumber",
    "Tracknumber","album","album artist","artist","comment","date","discnumber","genre","title","totaltracks","tracknumber",
};

// presorted - do not change without a proper strcmp resort
static const char * const standard_infonames[] = {
    "bitrate","bitspersample","channels","codec","codec_profile","encoding","samplerate","tagtype","tool",
};

static const char * optimize_fieldname(const char * p_string) {
    t_size index;
    if (!pfc::binarySearch<pfc::comparator_strcmp>::run(standard_fieldnames,0,PFC_TABSIZE(standard_fieldnames),p_string,index)) return NULL;
    return standard_fieldnames[index];
}

static const char * optimize_infoname(const char * p_string) {
    t_size index;
    if (!pfc::binarySearch<pfc::comparator_strcmp>::run(standard_infonames,0,PFC_TABSIZE(standard_infonames),p_string,index)) return NULL;
    return standard_infonames[index];
}

/*
order of things

  meta entries
  meta value map
  info entries 
  string buffer

*/

inline static char* stringbuffer_append(char * & buffer,const char * value)
{
    char * ret = buffer;
    while(*value) *(buffer++) = *(value++);
    *(buffer++) = 0;
    return ret;
}

#ifdef __file_info_const_impl_have_hintmap__

namespace {
    class sort_callback_hintmap_impl : public pfc::sort_callback
    {
    public:
        sort_callback_hintmap_impl(const file_info_const_impl::meta_entry * p_meta,file_info_const_impl::t_index * p_hintmap)
            : m_meta(p_meta), m_hintmap(p_hintmap)
        {
        }
        
        int compare(t_size p_index1, t_size p_index2) const
        {
//          profiler(sort_callback_hintmap_impl_compare);
            return pfc::stricmp_ascii(m_meta[m_hintmap[p_index1]].m_name,m_meta[m_hintmap[p_index2]].m_name);
        }
        
        void swap(t_size p_index1, t_size p_index2)
        {
            pfc::swap_t<file_info_const_impl::t_index>(m_hintmap[p_index1],m_hintmap[p_index2]);
        }
    private:
        const file_info_const_impl::meta_entry * m_meta;
        file_info_const_impl::t_index * m_hintmap;
    };

    class bsearch_callback_hintmap_impl// : public pfc::bsearch_callback
    {
    public:
        bsearch_callback_hintmap_impl(
            const file_info_const_impl::meta_entry * p_meta,
            const file_info_const_impl::t_index * p_hintmap,
            const char * p_name,
            t_size p_name_length)
            : m_meta(p_meta), m_hintmap(p_hintmap), m_name(p_name), m_name_length(p_name_length)
        {
        }

        inline int test(t_size p_index) const
        {
            return pfc::stricmp_ascii_ex(m_meta[m_hintmap[p_index]].m_name,~0,m_name,m_name_length);
        }

    private:
        const file_info_const_impl::meta_entry * m_meta;
        const file_info_const_impl::t_index * m_hintmap;
        const char * m_name;
        t_size m_name_length;
    };
}

#endif//__file_info_const_impl_have_hintmap__

void file_info_const_impl::copy(const file_info & p_source)
{
//  profiler(file_info_const_impl__copy);
    t_size meta_size = 0;
    t_size info_size = 0;
    t_size valuemap_size = 0;
    t_size stringbuffer_size = 0;
#ifdef __file_info_const_impl_have_hintmap__
    t_size hintmap_size = 0;
#endif

    const char * optbuf[64];
    size_t optwalk = 0;

    {
//      profiler(file_info_const_impl__copy__pass1);
        t_size index;
        m_meta_count = pfc::downcast_guarded<t_index>(p_source.meta_get_count());
        meta_size = m_meta_count * sizeof(meta_entry);
#ifdef __file_info_const_impl_have_hintmap__
        hintmap_size = (m_meta_count > hintmap_cutoff) ? m_meta_count * sizeof(t_index) : 0;
#endif//__file_info_const_impl_have_hintmap__
        for(index = 0; index < m_meta_count; index++ )
        {
            {
                const char * name = p_source.meta_enum_name(index);
                const char * opt = optimize_fieldname(name);
                if (optwalk < _countof(optbuf)) optbuf[optwalk++] = opt;
                if (opt == NULL) stringbuffer_size += strlen(name) + 1;
            }

            t_size val; const t_size val_max = p_source.meta_enum_value_count(index);
            
            if (val_max == 1)
            {
                stringbuffer_size += strlen(p_source.meta_enum_value(index,0)) + 1;
            }
            else
            {
                valuemap_size += val_max * sizeof(char*);

                for(val = 0; val < val_max; val++ )
                {
                    stringbuffer_size += strlen(p_source.meta_enum_value(index,val)) + 1;
                }
            }
        }

        m_info_count = pfc::downcast_guarded<t_index>(p_source.info_get_count());
        info_size = m_info_count * sizeof(info_entry);
        for(index = 0; index < m_info_count; index++ )
        {
            const char * name = p_source.info_enum_name(index);
            const char * opt = optimize_infoname(name);
            if (optwalk < _countof(optbuf)) optbuf[optwalk++] = opt;
            if (opt == NULL) stringbuffer_size += strlen(name) + 1;
            stringbuffer_size += strlen(p_source.info_enum_value(index)) + 1;
        }
    }


    {
//      profiler(file_info_const_impl__copy__alloc);
        m_buffer.set_size(
#ifdef __file_info_const_impl_have_hintmap__
            hintmap_size + 
#endif
            meta_size + info_size + valuemap_size + stringbuffer_size);
    }

    char * walk = m_buffer.get_ptr();

#ifdef __file_info_const_impl_have_hintmap__
    t_index* hintmap = (hintmap_size > 0) ? (t_index*) walk : NULL;
    walk += hintmap_size;
#endif
    meta_entry * meta = (meta_entry*) walk;
    walk += meta_size;
    char ** valuemap = (char**) walk;
    walk += valuemap_size;
    info_entry * info = (info_entry*) walk;
    walk += info_size;
    char * stringbuffer = walk;

    m_meta = meta;
    m_info = info;
#ifdef __file_info_const_impl_have_hintmap__
    m_hintmap = hintmap;
#endif

    optwalk = 0;
    {
//      profiler(file_info_const_impl__copy__pass2);
        t_size index;
        for( index = 0; index < m_meta_count; index ++ )
        {
            t_size val; const t_size val_max = p_source.meta_enum_value_count(index);

            {
                const char * name = p_source.meta_enum_name(index);
                const char * name_opt;

                if (optwalk < _countof(optbuf)) name_opt = optbuf[optwalk++];
                else name_opt = optimize_fieldname(name);

                if (name_opt == NULL)
                    meta[index].m_name = stringbuffer_append(stringbuffer, name );
                else
                    meta[index].m_name = name_opt;
            }
            
            meta[index].m_valuecount = val_max;

            if (val_max == 1)
            {
                meta[index].m_valuemap = reinterpret_cast<const char * const *>(stringbuffer_append(stringbuffer, p_source.meta_enum_value(index,0) ));
            }
            else
            {
                meta[index].m_valuemap = valuemap;
                for( val = 0; val < val_max ; val ++ )
                    *(valuemap ++ ) = stringbuffer_append(stringbuffer, p_source.meta_enum_value(index,val) );
            }
        }

        for( index = 0; index < m_info_count; index ++ )
        {
            const char * name = p_source.info_enum_name(index);
            const char * name_opt;

            if (optwalk < _countof(optbuf)) name_opt = optbuf[optwalk++];
            else name_opt = optimize_infoname(name);

            if (name_opt == NULL)
                info[index].m_name = stringbuffer_append(stringbuffer, name );
            else
                info[index].m_name = name_opt;
            info[index].m_value = stringbuffer_append(stringbuffer, p_source.info_enum_value(index) );
        }
    }

    m_length = p_source.get_length();
    m_replaygain = p_source.get_replaygain();
#ifdef __file_info_const_impl_have_hintmap__
    if (hintmap != NULL) {
//      profiler(file_info_const_impl__copy__hintmap);
        for(t_size n=0;n<m_meta_count;n++) hintmap[n]=n;
        pfc::sort(sort_callback_hintmap_impl(meta,hintmap),m_meta_count);
    }
#endif//__file_info_const_impl_have_hintmap__
}


void file_info_const_impl::reset()
{
    m_meta_count = m_info_count = 0; m_length = 0; m_replaygain.reset();
}

t_size file_info_const_impl::meta_find_ex(const char * p_name,t_size p_name_length) const
{
#ifdef __file_info_const_impl_have_hintmap__
    if (m_hintmap != NULL) {
        t_size result = ~0;
        if (!pfc::bsearch_inline_t(m_meta_count,bsearch_callback_hintmap_impl(m_meta,m_hintmap,p_name,p_name_length),result)) return ~0;
        else return m_hintmap[result];
    } else {
        return file_info::meta_find_ex(p_name,p_name_length);
    }
#else
    return file_info::meta_find_ex(p_name,p_name_length);
#endif
}


t_size  file_info_const_impl::meta_enum_value_count(t_size p_index) const
{
    return m_meta[p_index].m_valuecount;
}

const char* file_info_const_impl::meta_enum_value(t_size p_index,t_size p_value_number) const
{
    const meta_entry & entry = m_meta[p_index];
    if (entry.m_valuecount == 1)
        return reinterpret_cast<const char*>(entry.m_valuemap);
    else
        return entry.m_valuemap[p_value_number];
}