void DjVuSource::ReadAnnotations(GP<ByteStream> pInclStream,
set<GUTF8String>& processed, GP<ByteStream> pAnnoStream)
{
// Look for shared annotations
GUTF8String strInclude;
char buf[1024];
int nLength;
while ((nLength = pInclStream->read(buf, 1024)))
strInclude += GUTF8String(buf, nLength);
// Eat '\n' in the beginning and at the end
while (strInclude.length() > 0 && strInclude[0] == '\n')
strInclude = strInclude.substr(1, static_cast<unsigned int>(-1));
while (strInclude.length() > 0 && strInclude[static_cast<int>(strInclude.length()) - 1] == '\n')
strInclude.setat(strInclude.length() - 1, 0);
if (strInclude.length() > 0 && processed.find(strInclude) == processed.end())
{
processed.insert(strInclude);
GURL urlInclude = m_pDjVuDoc->id_to_url(strInclude);
GP<DataPool> pool = m_pDjVuDoc->request_data(NULL, urlInclude);
GP<ByteStream> stream = pool->get_stream();
GP<IFFByteStream> iff(IFFByteStream::create(stream));
// Check file format
GUTF8String chkid;
if (!iff->get_chunk(chkid) ||
(chkid != "FORM:DJVI" && chkid != "FORM:DJVU" &&
chkid != "FORM:PM44" && chkid != "FORM:BM44"))
{
return;
}
// Find chunk with page info
while (iff->get_chunk(chkid) != 0)
{
GP<ByteStream> chunk_stream = iff->get_bytestream();
if (chkid == "INCL")
{
ReadAnnotations(pInclStream, processed, pAnnoStream);
}
else if (chkid == "FORM:ANNO")
{
pAnnoStream->copy(*chunk_stream);
}
else if (chkid == "ANTa" || chkid == "ANTz")
{
const GP<IFFByteStream> iffout = IFFByteStream::create(pAnnoStream);
iffout->put_chunk(chkid);
iffout->copy(*chunk_stream);
iffout->close_chunk();
}
iff->seek_close_chunk();
}
}
}
void
create_bg44_chunk(IFFByteStream &iff, const char *ckid, GUTF8String filespec)
{
static GP<IFFByteStream> bg44iff;
if (! bg44iff)
{
if (flag_contains_bg)
DjVuPrintErrorUTF8("%s","djvumake: Duplicate BGxx chunk\n");
int i=filespec.rsearch(':');
for (int j=i+1; i>0 && j<(int)filespec.length(); j++)
if (filespec[j] < '0' || filespec[j] > '9')
i = -1;
if (!i)
G_THROW("djvumake: no filename specified in first BG44 specification");
GUTF8String filename=(i<0)?filespec:GUTF8String(filespec, i);
const GURL::Filename::UTF8 url(filename);
const GP<ByteStream> gbs(ByteStream::create(url,"rb"));
if(!gbs)
{
G_THROW("djvumake: no such file as"+filename);
}
bg44iff = IFFByteStream::create(gbs);
GUTF8String chkid;
bg44iff->get_chunk(chkid);
if (chkid != "FORM:PM44" && chkid != "FORM:BM44")
G_THROW("djvumake: BG44 file has incorrect format (wrong IFF header)");
if (i>=0)
filespec = i+1+(const char *)filespec;
else
filespec = "99";
}
else
{
if (filespec.length() && filespec[0]!=':')
G_THROW("djvumake: filename specified in BG44 refinement");
filespec = 1+(const char *)filespec;
}
const char *s=filespec;
int nchunks = strtol((char *)s, (char **)&s, 10);
if (nchunks<1 || nchunks>99)
G_THROW("djvumake: invalid number of chunks in BG44 specification");
if (*s)
G_THROW("djvumake: invalid BG44 specification (syntax error)");
int flag = (nchunks>=99);
GUTF8String chkid;
while (nchunks-->0 && bg44iff->get_chunk(chkid))
{
if (chkid!="PM44" && chkid!="BM44")
{
DjVuPrintErrorUTF8("%s","djvumake: BG44 file contains unrecognized chunks (fixed)\n");
nchunks += 1;
bg44iff->close_chunk();
continue;
}
GP<ByteStream> gmbs=ByteStream::create();
ByteStream &mbs=*gmbs;
mbs.copy(*(bg44iff->get_bytestream()));
bg44iff->close_chunk();
mbs.seek(0);
if (mbs.readall((void*)&primary, sizeof(primary)) != sizeof(primary))
G_THROW("djvumake: BG44 file is corrupted (cannot read primary header)\n");
if (primary.serial == 0)
{
if (mbs.readall((void*)&secondary, sizeof(secondary)) != sizeof(secondary))
G_THROW("djvumake: BG44 file is corrupted (cannot read secondary header)\n");
int iw = (secondary.xhi<<8) + secondary.xlo;
int ih = (secondary.yhi<<8) + secondary.ylo;
int red;
for (red=1; red<=12; red++)
if (iw==(w+red-1)/red && ih==(h+red-1)/red)
break;
flag_contains_bg = red;
if (red>12)
DjVuPrintErrorUTF8("%s","djvumake: BG44 subsampling is not in [1..12] range\n");
}
mbs.seek(0);
iff.put_chunk(ckid);
iff.copy(mbs);
iff.close_chunk();
flag = 1;
}
if (!flag)
DjVuPrintErrorUTF8("%s","djvumake: no more chunks in BG44 file\n");
}
PageInfo DjVuSource::ReadPageInfo(int nPage, bool bNeedText, bool bNeedAnno)
{
ASSERT(nPage >= 0 && nPage < m_nPageCount);
PageInfo pageInfo;
pageInfo.szPage.cx = 100;
pageInfo.szPage.cy = 100;
pageInfo.nDPI = 100;
pageInfo.bDecoded = true;
GP<ByteStream> pAnnoStream;
if (bNeedAnno)
pAnnoStream = ByteStream::create();
GP<ByteStream> pTextStream;
if (bNeedText)
pTextStream = ByteStream::create();
try
{
// Get raw data from the document and decode only requested chunks
// DjVuFile is not used to ensure that we do not wait for a lock
// to be released and thus do not block the UI thread
GURL url = m_pDjVuDoc->page_to_url(nPage);
GP<DataPool> pool = m_pDjVuDoc->request_data(NULL, url);
GP<ByteStream> stream = pool->get_stream();
GP<IFFByteStream> iff(IFFByteStream::create(stream));
// Check file format
GUTF8String chkid;
if (!iff->get_chunk(chkid) ||
(chkid != "FORM:DJVI" && chkid != "FORM:DJVU" &&
chkid != "FORM:PM44" && chkid != "FORM:BM44"))
{
return pageInfo;
}
bool bHasIW44 = false;
// Find chunk with page info
while (iff->get_chunk(chkid) != 0)
{
GP<ByteStream> chunk_stream = iff->get_bytestream();
if (chkid == "INFO")
{
// Get page dimensions and resolution from info chunk
GP<DjVuInfo> pInfo = DjVuInfo::create();
pInfo->decode(*chunk_stream);
// Check data for consistency
pageInfo.szPage.cx = max(pInfo->width, 0);
pageInfo.szPage.cy = max(pInfo->height, 0);
pageInfo.nInitialRotate = pInfo->orientation;
pageInfo.nDPI = max(pInfo->dpi, 0);
if ((pInfo->orientation & 1) != 0)
swap(pageInfo.szPage.cx, pageInfo.szPage.cy);
}
else if (!bHasIW44 && (chkid == "PM44" || chkid == "BM44"))
{
bHasIW44 = true;
// Get image dimensions and resolution from bitmap chunk
UINT serial = chunk_stream->read8();
UINT slices = chunk_stream->read8();
UINT major = chunk_stream->read8();
UINT minor = chunk_stream->read8();
UINT xhi = chunk_stream->read8();
UINT xlo = chunk_stream->read8();
UINT yhi = chunk_stream->read8();
UINT ylo = chunk_stream->read8();
pageInfo.szPage.cx = (xhi << 8) | xlo;
pageInfo.szPage.cy = (yhi << 8) | ylo;
pageInfo.nDPI = 100;
}
else if (chkid == "TXTa" || chkid == "TXTz")
{
pageInfo.bHasText = true;
if (bNeedText)
{
const GP<IFFByteStream> iffout = IFFByteStream::create(pTextStream);
iffout->put_chunk(chkid);
iffout->copy(*chunk_stream);
iffout->close_chunk();
}
}
else if (bNeedAnno && chkid == "FORM:ANNO")
{
pAnnoStream->copy(*chunk_stream);
}
else if (bNeedAnno && (chkid == "ANTa" || chkid == "ANTz"))
{
const GP<IFFByteStream> iffout = IFFByteStream::create(pAnnoStream);
iffout->put_chunk(chkid);
iffout->copy(*chunk_stream);
iffout->close_chunk();
}
else if (bNeedAnno && chkid == "INCL")
{
set<GUTF8String> processed;
ReadAnnotations(chunk_stream, processed, pAnnoStream);
}
iff->seek_close_chunk();
}
if (bNeedText && pTextStream->tell())
pageInfo.DecodeText(pTextStream);
if (bNeedAnno && pAnnoStream->tell())
pageInfo.DecodeAnno(pAnnoStream);
}
catch (GException&)
{
}
catch (...)
{
if (pApplication != NULL)
pApplication->ReportFatalError();
}
return pageInfo;
}
