ExecGPGV: Rework file removal on exit()

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

diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index 7fc8ab0e6bdab2f1e6dc860d3146e6038ee51b1b..0f4c15436a1bd6c82dfcb969bf3a8a9a0211a6eb 100644 (file)
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -27,6 +27,9 @@
 #include <string>
 #include <vector>
 #include <list>
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+#include <apt-pkg/string_view.h>
+#endif
 
 #ifndef APT_8_CLEANER_HEADERS
 #include <apt-pkg/fileutl.h>
@@ -34,7 +37,15 @@
 
 class FileFd;
 class pkgTagSectionPrivate;
+class pkgTagFilePrivate;
 
+/** \class pkgTagSection parses a single deb822 stanza and provides various Find methods
+ * to extract the included values. It can also be used to modify and write a
+ * valid deb822 stanza optionally (re)ordering the fields inside the stanza.
+ *
+ * Beware: This class does \b NOT support (#-)comments in in- or output!
+ * If the input contains comments they have to be stripped first like pkgTagFile
+ * does with SUPPORT_COMMENTS flag set. */
 class pkgTagSection
 {
    const char *Section;
@@ -50,19 +61,40 @@ class pkgTagSection
    inline bool operator ==(const pkgTagSection &rhs) {return Section == rhs.Section;};
    inline bool operator !=(const pkgTagSection &rhs) {return Section != rhs.Section;};
 
+#if !defined(APT_PKG_EXPOSE_STRING_VIEW) || defined(APT_COMPILING_TAGFILE_COMPAT_CC)
    bool Find(const char *Tag,const char *&Start, const char *&End) const;
    bool Find(const char *Tag,unsigned int &Pos) const;
-   std::string FindS(const char *Tag) const;
-   std::string FindRawS(const char *Tag) const;
    signed int FindI(const char *Tag,signed long Default = 0) const;
    bool FindB(const char *Tag, bool const &Default = false) const;
    unsigned long long FindULL(const char *Tag, unsigned long long const &Default = 0) const;
    bool FindFlag(const char * const Tag,uint8_t &Flags,
                 uint8_t const Flag) const;
-   bool static FindFlag(uint8_t &Flags, uint8_t const Flag,
-                               const char* const Start, const char* const Stop);
    bool FindFlag(const char *Tag,unsigned long &Flags,
                 unsigned long Flag) const;
+   bool Exists(const char* const Tag) const;
+#endif
+   // TODO: Remove internally
+   std::string FindS(const char *Tag) const;
+   std::string FindRawS(const char *Tag) const;
+
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+   APT_HIDDEN bool Find(APT::StringView Tag,const char *&Start, const char *&End) const;
+   APT_HIDDEN bool Find(APT::StringView Tag,unsigned int &Pos) const;
+   APT_HIDDEN APT::StringView Find(APT::StringView Tag) const;
+   APT_HIDDEN APT::StringView FindRaw(APT::StringView Tag) const;
+   APT_HIDDEN signed int FindI(APT::StringView Tag,signed long Default = 0) const;
+   APT_HIDDEN bool FindB(APT::StringView, bool Default = false) const;
+   APT_HIDDEN unsigned long long FindULL(APT::StringView Tag, unsigned long long const &Default = 0) const;
+
+   APT_HIDDEN bool FindFlag(APT::StringView Tag,uint8_t &Flags,
+                uint8_t const Flag) const;
+   APT_HIDDEN bool FindFlag(APT::StringView Tag,unsigned long &Flags,
+                unsigned long Flag) const;
+   APT_HIDDEN bool Exists(APT::StringView Tag) const;
+#endif
+
+   bool static FindFlag(uint8_t &Flags, uint8_t const Flag,
+                               const char* const Start, const char* const Stop);
    bool static FindFlag(unsigned long &Flags, unsigned long Flag,
                                const char* Start, const char* Stop);
 
@@ -94,7 +126,6 @@ class pkgTagSection
     * times, but only the last occurrence is available via Find methods.
     */
    unsigned int Count() const;
-   bool Exists(const char* const Tag) const;
 
    void Get(const char *&Start,const char *&Stop,unsigned int I) const;
 
@@ -132,14 +163,15 @@ class pkgTagSection
 };
 
 
-/* For user generated file the parser should be a bit more relaxed in exchange
-   for being a bit slower to allow comments and new lines all over the place */
-class pkgUserTagSection : public pkgTagSection
+class APT_DEPRECATED_MSG("Use pkgTagFile with the SUPPORT_COMMENTS flag instead") pkgUserTagSection : public pkgTagSection
 {
    virtual void TrimRecord(bool BeforeRecord, const char* &End) APT_OVERRIDE;
 };
 
-class pkgTagFilePrivate;
+/** \class pkgTagFile reads and prepares a deb822 formatted file for parsing
+ * via #pkgTagSection. The default mode tries to be as fast as possible and
+ * assumes perfectly valid (machine generated) files like Packages. Support
+ * for comments e.g. needs to be enabled explicitly. */
 class pkgTagFile
 {
    pkgTagFilePrivate * const d;
@@ -148,14 +180,22 @@ class pkgTagFile
    APT_HIDDEN bool Resize();
    APT_HIDDEN bool Resize(unsigned long long const newSize);
 
-   public:
+public:
 
    bool Step(pkgTagSection &Section);
    unsigned long Offset();
    bool Jump(pkgTagSection &Tag,unsigned long long Offset);
 
+   enum Flags
+   {
+      STRICT = 0,
+      SUPPORT_COMMENTS = 1 << 0,
+   };
+
+   void Init(FileFd * const F, pkgTagFile::Flags const Flags, unsigned long long Size = 32*1024);
    void Init(FileFd * const F,unsigned long long const Size = 32*1024);
 
+   pkgTagFile(FileFd * const F, pkgTagFile::Flags const Flags, unsigned long long Size = 32*1024);
    pkgTagFile(FileFd * const F,unsigned long long Size = 32*1024);
    virtual ~pkgTagFile();
 };
@@ -163,15 +203,14 @@ class pkgTagFile
 extern const char **TFRewritePackageOrder;
 extern const char **TFRewriteSourceOrder;
 
-// Use pkgTagSection::Tag and pkgTagSection::Write() instead
 APT_IGNORE_DEPRECATED_PUSH
-struct APT_DEPRECATED TFRewriteData
+struct APT_DEPRECATED_MSG("Use pkgTagSection::Tag and pkgTagSection::Write() instead") TFRewriteData
 {
    const char *Tag;
    const char *Rewrite;
    const char *NewTag;
 };
-APT_DEPRECATED bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
+APT_DEPRECATED_MSG("Use pkgTagSection::Tag and pkgTagSection::Write() instead") bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
               TFRewriteData *Rewrite);
 APT_IGNORE_DEPRECATED_POP