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// The authors have released ID3Lib as Public Domain (PD) and claim no copyright,
// patent or other intellectual property protection in this work. This means that
// it may be modified, redistributed and used in commercial and non-commercial
// software and hardware without restrictions. ID3Lib is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
//
// The ID3Lib authors encourage improvements and optimisations to be sent to the
// ID3Lib coordinator, currently Dirk Mahoney (dirk@id3.org). Approved
// submissions may be altered, and will be included and released under these terms.
//
// Mon Nov 23 18:34:01 1998
// improved/optimized/whatever 10/30/00 JF
#include <string.h>
#include "id3_tag.h"
ID3_Frame::ID3_Frame(ID3_FrameID id)
{
luint lwordsForFields = 0;
version = ID3_TAGVERSION;
revision = ID3_TAGREVISION;
numFields = 0;
fields = NULL;
groupingID[0] = 0;
encryptionID[0] = 0;
compression = false;
lwordsForFields = (((luint) ID3FN_LASTFIELDID) - 1) / (sizeof (luint) * 8);
if ((((luint) ID3FN_LASTFIELDID) - 1) % (sizeof (luint) * 8) != 0)
lwordsForFields++;
if (fieldBits = (bitset)calloc(lwordsForFields, sizeof(*fieldBits)))
{
for (luint i = 0; i < lwordsForFields; i++)
fieldBits[i] = 0;
}
else
ID3_THROW (ID3E_NoMemory);
SetID (id);
}
ID3_Frame::~ID3_Frame (void)
{
Clear();
if (fieldBits)
free(fieldBits);
}
void ID3_Frame::Clear (void)
{
if (numFields && fields)
{
for (luint i = 0; i < numFields; i++)
delete fields[i];
free(fields);
fields = NULL;
numFields = 0;
hasChanged = true;
}
return ;
}
void ID3_Frame::SetID (ID3_FrameID id)
{
ID3_FrameDef *info;
Clear();
if (id != ID3FID_NOFRAME)
{
if (info = ID3_FindFrameDef (id))
{
frameID = id;
numFields = 0;
while (info->fieldDefs[numFields].id != ID3FN_NOFIELD)
numFields++;
if ((fields = (ID3_Field **)calloc(numFields, sizeof(ID3_Field*))) == NULL)
ID3_THROW (ID3E_NoMemory);
else
{
for (luint i = 0; i < numFields; i++)
{
if ((fields[i] = new ID3_Field) == NULL)
ID3_THROW (ID3E_NoMemory);
else
{
fields[i]->name = info->fieldDefs[i].id;
fields[i]->type = info->fieldDefs[i].type;
fields[i]->fixedLength = info->fieldDefs[i].fixedLength;
fields[i]->ioVersion = info->fieldDefs[i].version;
fields[i]->ioRevision = info->fieldDefs[i].revision;
fields[i]->control = info->fieldDefs[i].control;
fields[i]->flags = info->fieldDefs[i].flags;
// tell the frame that this field is present
BS_SET (fieldBits, fields[i]->name);
}
}
hasChanged = true;
}
}
else
ID3_THROW (ID3E_InvalidFrameID);
}
return ;
}
ID3_FrameID ID3_Frame::GetID (void)
{
return frameID;
}
void ID3_Frame::SetVersion (uchar ver, uchar rev)
{
if (version != ver || revision != rev)
hasChanged = true;
version = ver;
revision = rev;
return ;
}
lsint ID3_Frame::FindField (ID3_FieldID fieldName)
{
if (BS_ISSET (fieldBits, fieldName))
{
lsint num = 0;
while (num < (lsint) numFields)
{
if (fields[num]->name == fieldName) return num;
num++;
}
return -1;
}
return 0;
}
ID3_Field& ID3_Frame::Field (ID3_FieldID fieldName)
{
luint fieldNum = FindField (fieldName);
if (fieldNum == -1)
ID3_THROW (ID3E_FieldNotFound);
return *fields[fieldNum];
}
void ID3_Frame::UpdateFieldDeps (void)
{
for (luint i = 0; i < numFields; i++)
{
if (fields[i]->flags & ID3FF_ADJUSTEDBY)
{
switch (fields[i]->type)
{
case ID3FTY_BITFIELD:
{
//luint value = 0;
// now find the field on which this
// field is dependent and get a copy
// of the value of that field.
// then adjust the fixedLength of this
// field to that value / 8.
}
break;
}
}
}
return ;
}
void ID3_Frame::UpdateStringTypes(void)
{
for (luint i = 0; i < numFields; i++)
{
if (fields[i]->flags & ID3FF_ADJUSTENC)
{
ID3_TextEnc enc;
ID3_FieldType newType;
enc = (ID3_TextEnc) Field(ID3FN_TEXTENC).Get();
switch (enc)
{
case ID3TE_ASCII:
newType = ID3FTY_ASCIISTRING;
break;
case ID3TE_UNICODE:
newType = ID3FTY_UNICODESTRING;
break;
case ID3TE_UTF8:
newType = ID3FTY_UTF8STRING;
break;
default:
newType = ID3FTY_ASCIISTRING;
break;
}
fields[i]->type = newType;
}
}
}
luint ID3_Frame::Size(void)
{
luint bytesUsed = 0;
ID3_FrameHeader header;
header.SetVersion (version, revision);
bytesUsed = header.Size();
if (strlen (encryptionID))
bytesUsed++;
if (strlen (groupingID))
bytesUsed++;
// this call is to tell the string fields
// what they should be rendered/parsed as
// (ASCII or Unicode)
UpdateStringTypes();
for (luint i = 0; i < numFields; i++)
{
fields[i]->SetVersion (version, revision);
bytesUsed += fields[i]->BinSize();
}
return bytesUsed;
}
bool ID3_Frame::HasChanged (void)
{
if (hasChanged) return hasChanged;
for (luint i = 0; i < numFields; i++)
{
bool changed = fields[i]->HasChanged();
if (changed) return changed;
}
return 0;
}
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