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/* poppler-cached-file-loader.h: glib interface to poppler
*
* Copyright (C) 2012 Carlos Garcia Campos <carlosgc@gnome.org>
* Copyright (C) 2022 Albert Astals Cid <aacid@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "poppler-cached-file-loader.h"
PopplerCachedFileLoader::PopplerCachedFileLoader(GInputStream *inputStreamA, GCancellable *cancellableA, goffset lengthA)
{
inputStream = (GInputStream *)g_object_ref(inputStreamA);
cancellable = cancellableA ? (GCancellable *)g_object_ref(cancellableA) : nullptr;
length = lengthA;
cachedFile = nullptr;
}
PopplerCachedFileLoader::~PopplerCachedFileLoader()
{
g_object_unref(inputStream);
if (cancellable) {
g_object_unref(cancellable);
}
}
size_t PopplerCachedFileLoader::init(CachedFile *cachedFileA)
{
size_t size;
gssize bytesRead;
char buf[CachedFileChunkSize];
cachedFile = cachedFileA;
if (length != (goffset)-1) {
return length;
}
if (G_IS_FILE_INPUT_STREAM(inputStream)) {
GFileInfo *info;
info = g_file_input_stream_query_info(G_FILE_INPUT_STREAM(inputStream), G_FILE_ATTRIBUTE_STANDARD_SIZE, cancellable, nullptr);
if (!info) {
error(errInternal, -1, "Failed to get size.");
return (size_t)-1;
}
length = g_file_info_get_size(info);
g_object_unref(info);
return length;
}
// Unknown stream length, read the whole stream and return the size.
CachedFileWriter writer = CachedFileWriter(cachedFile, nullptr);
size = 0;
do {
bytesRead = g_input_stream_read(inputStream, buf, CachedFileChunkSize, cancellable, nullptr);
if (bytesRead == -1) {
break;
}
writer.write(buf, bytesRead);
size += bytesRead;
} while (bytesRead > 0);
return size;
}
int PopplerCachedFileLoader::load(const std::vector<ByteRange> &ranges, CachedFileWriter *writer)
{
char buf[CachedFileChunkSize];
gssize bytesRead;
size_t rangeBytesRead, bytesToRead;
if (length == (goffset)-1) {
return 0;
}
for (const ByteRange &range : ranges) {
bytesToRead = MIN(CachedFileChunkSize, range.length);
rangeBytesRead = 0;
g_seekable_seek(G_SEEKABLE(inputStream), range.offset, G_SEEK_SET, cancellable, nullptr);
do {
bytesRead = g_input_stream_read(inputStream, buf, bytesToRead, cancellable, nullptr);
if (bytesRead == -1) {
return -1;
}
writer->write(buf, bytesRead);
rangeBytesRead += bytesRead;
bytesToRead = range.length - rangeBytesRead;
} while (bytesRead > 0 && bytesToRead > 0);
}
return 0;
}
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