128 KiB DSC files ought to be enough for everyone

Your mileage may vary, but don't worry: There is more than one way to
do it, but our one size fits all is not a bigger hammer, but an entire
roundhouse kick! So brace yourself for the tl;dr: The limit is gone.*

Beware: This fixes also the problem that a double newline is
unconditionally added 'later' which is an overcommitment in case
the dsc filesize is limit-2 <= x <= limit.

* limited to numbers fitting into an unsigned long long.

Closes: 774893

1 files changed, 27 insertions, 14 deletions

diff --git a/ftparchive/sources.cc b/ftparchive/sources.cc
index d0878a70a..ab976b490 100644
--- a/ftparchive/sources.cc
+++ b/ftparchive/sources.cc
@@ -1,5 +1,5 @@
 #include <string>
-#include <iostream>
+#include <sstream>
 
 // for memcpy
 #include <cstring>
@@ -9,17 +9,19 @@
 
 #include "sources.h"
 
-bool DscExtract::TakeDsc(const void *newData, unsigned long newSize)
+bool DscExtract::TakeDsc(const void *newData, unsigned long long newSize)
 {
-   if(newSize > maxSize)
-     return _error->Error("DSC data is too large %lu!", newSize);
-
    if (newSize == 0)
    {
+      // adding two newlines 'off record' for pkgTagSection.Scan() calls
+      Data = "\n\n";
       Length = 0;
       return true;
    }
-   memcpy(Data, newData, newSize);
+
+   Data = std::string((const char*)newData, newSize);
+   // adding two newlines 'off record' for pkgTagSection.Scan() calls
+   Data.append("\n\n");
    Length = newSize;
 
    return true;
@@ -27,20 +29,31 @@ bool DscExtract::TakeDsc(const void *newData, unsigned long newSize)
 
 bool DscExtract::Read(std::string FileName)
 {
+   Data.clear();
+   Length = 0;
+
    FileFd F;
    if (OpenMaybeClearSignedFile(FileName, F) == false)
       return false;
-   
-   unsigned long long const FSize = F.FileSize();
-   if(FSize > maxSize)
-     return _error->Error("DSC file '%s' is too large!",FileName.c_str());
-
-   if (F.Read(Data, FSize) == false)
-      return false;
-   Length = FSize;
 
    IsClearSigned = (FileName != F.Name());
 
+   std::ostringstream data;
+   char buffer[1024];
+   do {
+      unsigned long long actual = 0;
+      if (F.Read(buffer, sizeof(buffer)-1, &actual) == false)
+	 return _error->Errno("read", "Failed to read dsc file %s", FileName.c_str());
+      if (actual == 0)
+	 break;
+      Length += actual;
+      buffer[actual] = '\0';
+      data << buffer;
+   } while(true);
+
+   // adding two newlines 'off record' for pkgTagSection.Scan() calls
+   data << "\n\n";
+   Data = data.str();
    return true;
 }