add a simple stack handling to be able to delay error handling

[apt.git] / apt-pkg / tagfile.cc

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 0ae6950f3e2dd350a89bbae1432e273f2b71f84b..96a681bec9f8ce9224192db4a50304b9492aa001 100644 (file)
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -81,7 +81,7 @@ bool pkgTagFile::Resize()
    End = Start + EndSize;
    return true;
 }
-
+                                                                       /*}}}*/
 // TagFile::Step - Advance to the next section                         /*{{{*/
 // ---------------------------------------------------------------------
 /* If the Section Scanner fails we refill the buffer and try again. 
@@ -193,17 +193,8 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
                                                                        /*}}}*/
 // TagSection::Scan - Scan for the end of the header information       /*{{{*/
 // ---------------------------------------------------------------------
-/* This looks for the first double new line in the data stream. It also
-   indexes the tags in the section. This very simple hash function for the
-   last 8 letters gives very good performance on the debian package files */
-inline static unsigned long AlphaHash(const char *Text, const char *End = 0)
-{
-   unsigned long Res = 0;
-   for (; Text != End && *Text != ':' && *Text != 0; Text++)
-      Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1);
-   return Res & 0xFF;
-}
-
+/* This looks for the first double new line in the data stream.
+   It also indexes the tags in the section. */
 bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
 {
    const char *End = Start + MaxLength;
@@ -212,10 +203,12 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
 
    if (Stop == 0)
       return false;
-   
+
    TagCount = 0;
    while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
    {
+       TrimRecord(true,End);
+
       // Start a new index and add it to the hash
       if (isspace(Stop[0]) == 0)
       {
@@ -227,14 +220,14 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
       
       if (Stop == 0)
         return false;
-      
+
       for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
 
       // Double newline marks the end of the record
       if (Stop+1 < End && Stop[1] == '\n')
       {
         Indexes[TagCount] = Stop - Section;
-        for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++);
+        TrimRecord(false,End);
         return true;
       }
       
@@ -244,6 +237,16 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
    return false;
 }
                                                                        /*}}}*/
+// TagSection::TrimRecord - Trim off any garbage before/after a record /*{{{*/
+// ---------------------------------------------------------------------
+/* There should be exactly 2 newline at the end of the record, no more. */
+void pkgTagSection::TrimRecord(bool BeforeRecord, const char*& End)
+{
+   if (BeforeRecord == true)
+      return;
+   for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++);
+}
+                                                                       /*}}}*/
 // TagSection::Trim - Trim off any trailing garbage                    /*{{{*/
 // ---------------------------------------------------------------------
 /* There should be exactly 1 newline at the end of the buffer, no more. */
@@ -362,6 +365,30 @@ signed int pkgTagSection::FindI(const char *Tag,signed long Default) const
    return Result;
 }
                                                                        /*}}}*/
+// TagSection::FindULL - Find an unsigned long long integer            /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long long pkgTagSection::FindULL(const char *Tag, unsigned long long const &Default) const
+{
+   const char *Start;
+   const char *Stop;
+   if (Find(Tag,Start,Stop) == false)
+      return Default;
+
+   // Copy it into a temp buffer so we can use strtoull
+   char S[100];
+   if ((unsigned)(Stop - Start) >= sizeof(S))
+      return Default;
+   strncpy(S,Start,Stop-Start);
+   S[Stop - Start] = 0;
+   
+   char *End;
+   unsigned long long Result = strtoull(S,&End,10);
+   if (S == End)
+      return Default;
+   return Result;
+}
+                                                                       /*}}}*/
 // TagSection::FindFlag - Locate a yes/no type flag                    /*{{{*/
 // ---------------------------------------------------------------------
 /* The bits marked in Flag are masked on/off in Flags */
@@ -390,7 +417,6 @@ bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
    return true;
 }
                                                                        /*}}}*/
-
 // TFRewrite - Rewrite a control record                                        /*{{{*/
 // ---------------------------------------------------------------------
 /* This writes the control record to stdout rewriting it as necessary. The