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#include "nsid3v2/nsid3v2.h"
#include "nsid3v2/header.h"
#include "nsid3v2/tag.h"
#include "nsid3v2/frame_utils.h"
#include "nu/AutoWide.h"
#include <strsafe.h>
struct ParsedComments
{
const char *language;
uint8_t description_encoding; // 0 - iso-8859-1, 1 - UTF16LE, 2 - UTF16BE, 3 - UTF8
union
{
const char *as8;
const wchar_t *as16;
} description_data;
size_t description_cch;
uint8_t value_encoding; // 0 - iso-8859-1, 1 - UTF16LE, 2 - UTF16BE, 3 - UTF8
union
{
const char *as8;
const wchar_t *as16;
} value_data;
size_t value_cch;
};
static int ParseComments(const void *data, size_t data_len, ParsedComments &parsed)
{
int ret;
if (data_len < 5)
return NErr_Error;
const uint8_t *data8 = (const uint8_t *)data;
switch(data8[0])
{
case 0: // ISO-8859-1
parsed.description_encoding = 0;
parsed.language = (const char *)&data8[1];
parsed.value_encoding = 0;
parsed.description_data.as8 = (const char *)&data8[4];
data_len-=4;
ret = ParseDescription(parsed.description_data.as8, data_len, parsed.description_cch);
if (ret != NErr_Success)
return ret;
parsed.value_data.as8 = parsed.description_data.as8 + 2 + parsed.description_cch;
parsed.value_cch = data_len;
return NErr_Success;
case 1: // UTF-16
parsed.language = (const char *)&data8[1];
parsed.description_encoding=1;
parsed.description_data.as16 = (const wchar_t *)&data8[4];
data_len-=4;
ret = ParseDescription(parsed.description_data.as16, data_len, parsed.description_cch, parsed.description_encoding);
if (ret != NErr_Success)
return ret;
parsed.value_data.as16 = parsed.description_data.as16 + 2 + parsed.description_cch;
parsed.value_cch = data_len/2;
if (parsed.value_cch && parsed.value_data.as16[0] == 0xFFFE)
{
parsed.value_encoding=2;
parsed.value_data.as16++;
parsed.value_cch--;
}
else if (parsed.value_cch && parsed.value_data.as16[0] == 0xFEFF)
{
parsed.value_encoding=1;
parsed.value_data.as16++;
parsed.value_cch--;
}
else
{
parsed.value_encoding=1;
}
return NErr_Success;
case 2: // UTF-16 BE
parsed.language = (const char *)&data8[1];
parsed.description_encoding=2;
parsed.description_data.as16 = (const wchar_t *)&data8[4];
data_len-=3;
ret = ParseDescription(parsed.description_data.as16, data_len, parsed.description_cch, parsed.description_encoding);
if (ret != NErr_Success)
return ret;
parsed.value_data.as16 = parsed.description_data.as16 + 2 + parsed.description_cch;
parsed.value_cch = data_len/2;
parsed.value_encoding=2;
return NErr_Success;
case 3: // UTF-8
parsed.description_encoding = 3;
parsed.language = (const char *)&data8[1];
parsed.value_encoding = 3;
parsed.description_data.as8 = (const char *)&data8[4];
data_len-=4;
ret = ParseDescription(parsed.description_data.as8, data_len, parsed.description_cch);
if (ret != NErr_Success)
return ret;
// check for UTF-8 BOM
if (parsed.description_cch >= 3 && parsed.description_data.as8[0] == 0xEF && parsed.description_data.as8[1] == 0xBB && parsed.description_data.as8[2] == 0xBF)
{
parsed.description_data.as8+=3;
parsed.description_cch-=3;
}
if (!data_len)
return NErr_Error;
parsed.value_data.as8 = parsed.description_data.as8 + 2 + parsed.description_cch;
parsed.value_cch = data_len;
// check for UTF-8 BOM
if (parsed.value_cch >= 3 && parsed.value_data.as8[0] == 0xEF && parsed.value_data.as8[1] == 0xBB && parsed.value_data.as8[2] == 0xBF)
{
parsed.value_data.as8+=3;
parsed.value_cch-=3;
}
return NErr_Success;
}
return NErr_NotImplemented;
}
int NSID3v2_Tag_Comments_GetUTF16(const nsid3v2_tag_t t, const wchar_t *description, wchar_t *buf, size_t buf_cch, int text_flags)
{
const ID3v2::Tag *tag = (const ID3v2::Tag *)t;
const ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_COMMENTS);
while (frame)
{
const void *data;
size_t data_len;
ParsedComments parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseComments(data, data_len, parsed) == NErr_Success)
{
// see if our description matches
switch(parsed.description_encoding)
{
case 0: // ISO-8859-1
{
UINT codepage = (text_flags & NSID3V2_TEXT_SYSTEM)?28591:CP_ACP;
if (CompareStringW(MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT), NORM_IGNORECASE, AutoWide(parsed.description_data.as8, codepage), -1, description, -1) != CSTR_EQUAL)
goto next_frame;
}
break;
case 1:
if (CompareStringW(MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT), NORM_IGNORECASE, parsed.description_data.as16, -1, description, -1) != CSTR_EQUAL)
goto next_frame;
break;
case 2:
// TODO!
goto next_frame;
break;
case 3:
if (CompareStringW(MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT), NORM_IGNORECASE, AutoWide(parsed.description_data.as8, CP_UTF8), -1, description, -1) != CSTR_EQUAL)
goto next_frame;
break;
}
switch(parsed.value_encoding)
{
case 0: // ISO-8859-1
{
UINT codepage = (text_flags & NSID3V2_TEXT_SYSTEM)?28591:CP_ACP;
int utf16_len = MultiByteToWideChar(codepage, 0, parsed.value_data.as8, parsed.value_cch, 0, 0);
if (utf16_len)
{
utf16_len = MultiByteToWideChar(codepage, 0, parsed.value_data.as8, parsed.value_cch, buf, utf16_len-1);
buf[utf16_len]=0;
}
else
{
buf[0]=0;
}
}
return NErr_Success;
case 1: // UTF-16
StringCchCopyNW(buf, buf_cch, parsed.value_data.as16, parsed.value_cch);
return NErr_Success;
case 2: // UTF-16BE
{
size_t toCopy = buf_cch-1;
if (parsed.value_cch < toCopy)
toCopy = parsed.value_cch;
for (size_t i=0;i<toCopy;i++)
{
buf[i] = ((parsed.value_data.as16[i] >> 8) & 0xFF) | (((parsed.value_data.as16[i]) & 0xFF) << 8);
}
buf[toCopy]=0;
}
return NErr_Success;
case 3: // UTF-8
{
int utf16_len = MultiByteToWideChar(CP_UTF8, 0, parsed.value_data.as8, parsed.value_cch, 0, 0);
if (utf16_len)
{
utf16_len = MultiByteToWideChar(CP_UTF8, 0, parsed.value_data.as8, parsed.value_cch, buf, utf16_len-1);
buf[utf16_len]=0;
}
else
{
buf[0]=0;
}
}
return NErr_Success;
}
next_frame:
frame = tag->FindNextFrame(frame);
}
}
return NErr_Error;
}
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