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73 lines
2.3 KiB
Diff
73 lines
2.3 KiB
Diff
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commit 970fb11a296b5bbdc5e8425851253d2c5913c45e
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Author: Leon Bottou <leon@bottou.org>
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Date: Tue Mar 26 20:36:31 2019 -0400
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Fix bug#296
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diff --git a/libdjvu/DjVmDir.cpp b/libdjvu/DjVmDir.cpp
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index a6a39e0..0a0fac6 100644
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--- a/libdjvu/DjVmDir.cpp
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+++ b/libdjvu/DjVmDir.cpp
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@@ -299,42 +299,44 @@ DjVmDir::decode(const GP<ByteStream> &gstr)
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memcpy((char*) strings+strings_size, buffer, length);
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}
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DEBUG_MSG("size of decompressed names block=" << strings.size() << "\n");
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- if (strings[strings.size()-1] != 0)
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- {
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- int strings_size=strings.size();
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- strings.resize(strings_size+1);
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- strings[strings_size] = 0;
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- }
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+ int strings_size=strings.size();
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+ strings.resize(strings_size+3);
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+ memset((char*) strings+strings_size, 0, 4);
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- // Copy names into the files
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+ // Copy names into the files
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const char * ptr=strings;
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for(pos=files_list;pos;++pos)
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{
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GP<File> file=files_list[pos];
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-
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+ if (ptr >= (const char*)strings + strings_size)
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+ G_THROW( "DjVu document is corrupted (DjVmDir)" );
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file->id=ptr;
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ptr+=file->id.length()+1;
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if (file->flags & File::HAS_NAME)
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{
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- file->name=ptr;
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- ptr+=file->name.length()+1;
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- } else
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+ file->name=ptr;
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+ ptr+=file->name.length()+1;
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+ }
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+ else
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{
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file->name=file->id;
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}
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if (file->flags & File::HAS_TITLE)
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{
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- file->title=ptr;
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- ptr+=file->title.length()+1;
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- } else
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- file->title=file->id;
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- /* msr debug: multipage file, file->title is null.
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+ file->title=ptr;
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+ ptr+=file->title.length()+1;
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+ }
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+ else
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+ {
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+ file->title=file->id;
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+ }
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+ /* msr debug: multipage file, file->title is null.
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DEBUG_MSG(file->name << ", " << file->id << ", " << file->title << ", " <<
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file->offset << ", " << file->size << ", " <<
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file->is_page() << "\n"); */
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}
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- // Check that there is only one file with SHARED_ANNO flag on
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+ // Check that there is only one file with SHARED_ANNO flag on
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int shared_anno_cnt=0;
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for(pos=files_list;pos;++pos)
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{
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