// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: deblistparser.cc,v 1.2 1998/07/04 22:32:17 jgg Exp $
+// $Id: deblistparser.cc,v 1.29.2.5 2004/01/06 01:43:44 mdz Exp $
/* ######################################################################
Package Cache Generator - Generator for the cache structure.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
-#include <pkglib/deblistparser.h>
-#include <pkglib/error.h>
+#include <apt-pkg/deblistparser.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/crc-16.h>
+#include <apt-pkg/md5.h>
+
+#include <ctype.h>
+
#include <system.h>
/*}}}*/
+static debListParser::WordList PrioList[] = {{"important",pkgCache::State::Important},
+ {"required",pkgCache::State::Required},
+ {"standard",pkgCache::State::Standard},
+ {"optional",pkgCache::State::Optional},
+ {"extra",pkgCache::State::Extra},
+ {}};
+
// ListParser::debListParser - Constructor /*{{{*/
// ---------------------------------------------------------------------
/* */
-debListParser::debListParser(File &File) : Tags(File)
-{
-}
- /*}}}*/
-// ListParser::FindTag - Find the tag and return a string /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-string debListParser::FindTag(const char *Tag)
-{
- const char *Start;
- const char *Stop;
- if (Section.Find(Tag,Start,Stop) == false)
- return string();
- return string(Start,Stop - Start);
-}
- /*}}}*/
-// ListParser::FindTagI - Find the tag and return an int /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-signed long debListParser::FindTagI(const char *Tag,signed long Default)
+debListParser::debListParser(FileFd *File) : Tags(File)
{
- const char *Start;
- const char *Stop;
- if (Section.Find(Tag,Start,Stop) == false)
- return Default;
-
- // Copy it into a temp buffer so we can use strtol
- char S[300];
- if ((unsigned)(Stop - Start) >= sizeof(S))
- return Default;
- strncpy(S,Start,Stop-Start);
- S[Stop - Start] = 0;
-
- char *End;
- signed long Result = strtol(S,&End,10);
- if (S == End)
- return Default;
- return Result;
+ Arch = _config->Find("APT::architecture");
}
/*}}}*/
// ListParser::UniqFindTagWrite - Find the tag and write a unq string /*{{{*/
return WriteUniqString(Start,Stop - Start);
}
/*}}}*/
-// ListParser::HandleFlag - Sets a flag variable based on a tag /*{{{*/
-// ---------------------------------------------------------------------
-/* This checks the tag for true/false yes/no etc */
-bool debListParser::HandleFlag(const char *Tag,unsigned long &Flags,
- unsigned long Flag)
-{
- const char *Start;
- const char *Stop;
- if (Section.Find(Tag,Start,Stop) == false)
- return true;
-
- int Set = 2;
- if (strncasecmp(Start,"yes",Stop - Start) == 0)
- Set = 1;
- if (strncasecmp(Start,"true",Stop - Start) == 0)
- Set = 1;
- if (strncasecmp(Start,"no",Stop - Start) == 0)
- Set = 0;
- if (strncasecmp(Start,"false",Stop - Start) == 0)
- Set = 0;
- if (Set == 2)
- {
- _error->Warning("Unknown flag value");
- return true;
- }
-
- if (Set == 0)
- Flags &= ~Flag;
- if (Set == 1)
- Flags |= Flag;
- return true;
-}
- /*}}}*/
// ListParser::Package - Return the package name /*{{{*/
// ---------------------------------------------------------------------
/* This is to return the name of the package this section describes */
string debListParser::Package()
{
- string Result = FindTag("Package");
+ string Result = Section.FindS("Package");
if (Result.empty() == true)
- _error->Error("Encoutered a section with no Package: header");
+ _error->Error("Encountered a section with no Package: header");
return Result;
}
/*}}}*/
entry is assumed to only describe package properties */
string debListParser::Version()
{
- return FindTag("Version");
-}
- /*}}}*/
-// ListParser::NewPackage - Fill in the package structure /*{{{*/
-// ---------------------------------------------------------------------
-/* This is called when a new package structure is created. It must fill
- in the static package information. */
-bool debListParser::NewPackage(pkgCache::PkgIterator Pkg)
-{
- // Debian doesnt have anything, everything is condionally megered
- return true;
+ return Section.FindS("Version");
}
/*}}}*/
// ListParser::NewVersion - Fill in the version structure /*{{{*/
bool debListParser::NewVersion(pkgCache::VerIterator Ver)
{
// Parse the section
- if ((Ver->Section = UniqFindTagWrite("Section")) == 0)
- return _error->Warning("Missing Section tag");
+ Ver->Section = UniqFindTagWrite("Section");
+ Ver->Arch = UniqFindTagWrite("Architecture");
// Archive Size
- if ((Ver->Size = (unsigned)FindTagI("Size")) == 0)
- return _error->Error("Unparsable Size field");
+ Ver->Size = (unsigned)Section.FindI("Size");
// Unpacked Size (in K)
- if ((Ver->InstalledSize = (unsigned)FindTagI("Installed-Size")) == 0)
- return _error->Error("Unparsable Installed-Size field");
+ Ver->InstalledSize = (unsigned)Section.FindI("Installed-Size");
Ver->InstalledSize *= 1024;
// Priority
const char *Start;
const char *Stop;
if (Section.Find("Priority",Start,Stop) == true)
- {
- WordList PrioList[] = {{"important",pkgCache::Important},
- {"required",pkgCache::Required},
- {"standard",pkgCache::Standard},
- {"optional",pkgCache::Optional},
- {"extra",pkgCache::Extra}};
- if (GrabWord(string(Start,Stop-Start),PrioList,
- _count(PrioList),Ver->Priority) == false)
- return _error->Error("Malformed Priority line");
+ {
+ if (GrabWord(string(Start,Stop-Start),PrioList,Ver->Priority) == false)
+ Ver->Priority = pkgCache::State::Extra;
}
+
+ if (ParseDepends(Ver,"Depends",pkgCache::Dep::Depends) == false)
+ return false;
+ if (ParseDepends(Ver,"Pre-Depends",pkgCache::Dep::PreDepends) == false)
+ return false;
+ if (ParseDepends(Ver,"Suggests",pkgCache::Dep::Suggests) == false)
+ return false;
+ if (ParseDepends(Ver,"Recommends",pkgCache::Dep::Recommends) == false)
+ return false;
+ if (ParseDepends(Ver,"Conflicts",pkgCache::Dep::Conflicts) == false)
+ return false;
+ if (ParseDepends(Ver,"Replaces",pkgCache::Dep::Replaces) == false)
+ return false;
+
+ // Obsolete.
+ if (ParseDepends(Ver,"Optional",pkgCache::Dep::Suggests) == false)
+ return false;
+
+ if (ParseProvides(Ver) == false)
+ return false;
return true;
}
/*}}}*/
+// ListParser::Description - Return the description string /*{{{*/
+// ---------------------------------------------------------------------
+/* This is to return the string describing the package in debian
+ form. If this returns the blank string then the entry is assumed to
+ only describe package properties */
+string debListParser::Description()
+{
+ if (DescriptionLanguage().empty())
+ return Section.FindS("Description");
+ else
+ return Section.FindS(("Description-" + pkgIndexFile::LanguageCode()).c_str());
+}
+ /*}}}*/
+// ListParser::DescriptionLanguage - Return the description lang string /*{{{*/
+// ---------------------------------------------------------------------
+/* This is to return the string describing the language of
+ description. If this returns the blank string then the entry is
+ assumed to describe original description. */
+string debListParser::DescriptionLanguage()
+{
+ return Section.FindS("Description").empty() ? pkgIndexFile::LanguageCode() : "";
+}
+ /*}}}*/
+// ListParser::Description - Return the description_md5 MD5SumValue /*{{{*/
+// ---------------------------------------------------------------------
+/* This is to return the md5 string to allow the check if is the right
+ description. If thisreturns a blank string then calculate the md5
+ value. */
+MD5SumValue debListParser::Description_md5()
+{
+ string value = Section.FindS("Description-md5");
+
+ if (value.empty()) {
+ MD5Summation md5;
+ md5.Add((Description() + "\n").c_str());
+ return md5.Result();
+ } else
+ return MD5SumValue(value);
+}
+ /*}}}*/
// ListParser::UsePackage - Update a package structure /*{{{*/
// ---------------------------------------------------------------------
/* This is called to update the package with any new information
pkgCache::VerIterator Ver)
{
if (Pkg->Section == 0)
- if ((Pkg->Section = UniqFindTagWrite("Section")) == 0)
- return false;
- if (HandleFlag("Essential",Pkg->Flags,pkgCache::Essential) == false)
+ Pkg->Section = UniqFindTagWrite("Section");
+ if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
return false;
- if (HandleFlag("Immediate-Configure",Pkg->Flags,pkgCache::ImmediateConf) == false)
+ if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false)
return false;
+
+ if (strcmp(Pkg.Name(),"apt") == 0)
+ Pkg->Flags |= pkgCache::Flag::Important;
+
if (ParseStatus(Pkg,Ver) == false)
return false;
return true;
}
/*}}}*/
-// ListParser::ParseStatus - Parse the status feild /*{{{*/
+// ListParser::VersionHash - Compute a unique hash for this version /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned short debListParser::VersionHash()
+{
+ const char *Sections[] ={"Installed-Size",
+ "Depends",
+ "Pre-Depends",
+// "Suggests",
+// "Recommends",
+ "Conflicts",
+ "Replaces",0};
+ unsigned long Result = INIT_FCS;
+ char S[1024];
+ for (const char **I = Sections; *I != 0; I++)
+ {
+ const char *Start;
+ const char *End;
+ if (Section.Find(*I,Start,End) == false || End - Start >= (signed)sizeof(S))
+ continue;
+
+ /* Strip out any spaces from the text, this undoes dpkgs reformatting
+ of certain fields. dpkg also has the rather interesting notion of
+ reformatting depends operators < -> <= */
+ char *I = S;
+ for (; Start != End; Start++)
+ {
+ if (isspace(*Start) == 0)
+ *I++ = tolower(*Start);
+ if (*Start == '<' && Start[1] != '<' && Start[1] != '=')
+ *I++ = '=';
+ if (*Start == '>' && Start[1] != '>' && Start[1] != '=')
+ *I++ = '=';
+ }
+
+ Result = AddCRC16(Result,S,I - S);
+ }
+
+ return Result;
+}
+ /*}}}*/
+// ListParser::ParseStatus - Parse the status field /*{{{*/
// ---------------------------------------------------------------------
/* Status lines are of the form,
Status: want flag status
want = unknown, install, hold, deinstall, purge
flag = ok, reinstreq, hold, hold-reinstreq
- status = not-installed, unpacked, half-configured, uninstalled,
+ status = not-installed, unpacked, half-configured,
half-installed, config-files, post-inst-failed,
removal-failed, installed
return _error->Error("Malformed Status line");
// Process the want field
- WordList WantList[] = {{"unknown",pkgCache::Unknown},
- {"install",pkgCache::Install},
- {"hold",pkgCache::Hold},
- {"deinstall",pkgCache::DeInstall},
- {"purge",pkgCache::Purge}};
- if (GrabWord(string(Start,I-Start),WantList,
- _count(WantList),Pkg->SelectedState) == false)
+ WordList WantList[] = {{"unknown",pkgCache::State::Unknown},
+ {"install",pkgCache::State::Install},
+ {"hold",pkgCache::State::Hold},
+ {"deinstall",pkgCache::State::DeInstall},
+ {"purge",pkgCache::State::Purge},
+ {}};
+ if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false)
return _error->Error("Malformed 1st word in the Status line");
// Isloate the next word
return _error->Error("Malformed status line, no 2nd word");
// Process the flag field
- WordList FlagList[] = {{"ok",pkgCache::Ok},
- {"reinstreq",pkgCache::ReInstReq},
- {"hold",pkgCache::HoldInst},
- {"hold-reinstreq",pkgCache::HoldReInstReq}};
- if (GrabWord(string(Start,I-Start),FlagList,
- _count(FlagList),Pkg->InstState) == false)
+ WordList FlagList[] = {{"ok",pkgCache::State::Ok},
+ {"reinstreq",pkgCache::State::ReInstReq},
+ {"hold",pkgCache::State::HoldInst},
+ {"hold-reinstreq",pkgCache::State::HoldReInstReq},
+ {}};
+ if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false)
return _error->Error("Malformed 2nd word in the Status line");
// Isloate the last word
return _error->Error("Malformed Status line, no 3rd word");
// Process the flag field
- WordList StatusList[] = {{"not-installed",pkgCache::NotInstalled},
- {"unpacked",pkgCache::UnPacked},
- {"half-configured",pkgCache::HalfConfigured},
- {"installed",pkgCache::Installed},
- {"uninstalled",pkgCache::UnInstalled},
- {"half-installed",pkgCache::HalfInstalled},
- {"config-files",pkgCache::ConfigFiles},
- {"post-inst-failed",pkgCache::HalfConfigured},
- {"removal-failed",pkgCache::HalfInstalled}};
- if (GrabWord(string(Start,I-Start),StatusList,
- _count(StatusList),Pkg->CurrentState) == false)
+ WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled},
+ {"unpacked",pkgCache::State::UnPacked},
+ {"half-configured",pkgCache::State::HalfConfigured},
+ {"installed",pkgCache::State::Installed},
+ {"half-installed",pkgCache::State::HalfInstalled},
+ {"config-files",pkgCache::State::ConfigFiles},
+ {"post-inst-failed",pkgCache::State::HalfConfigured},
+ {"removal-failed",pkgCache::State::HalfInstalled},
+ {}};
+ if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false)
return _error->Error("Malformed 3rd word in the Status line");
/* A Status line marks the package as indicating the current
version as well. Only if it is actually installed.. Otherwise
the interesting dpkg handling of the status file creates bogus
entries. */
- if (!(Pkg->CurrentState == pkgCache::NotInstalled ||
- Pkg->CurrentState == pkgCache::ConfigFiles))
+ if (!(Pkg->CurrentState == pkgCache::State::NotInstalled ||
+ Pkg->CurrentState == pkgCache::State::ConfigFiles))
{
if (Ver.end() == true)
_error->Warning("Encountered status field in a non-version description");
Pkg->CurrentVer = Ver.Index();
}
+ return true;
+}
+
+const char *debListParser::ConvertRelation(const char *I,unsigned int &Op)
+{
+ // Determine the operator
+ switch (*I)
+ {
+ case '<':
+ I++;
+ if (*I == '=')
+ {
+ I++;
+ Op = pkgCache::Dep::LessEq;
+ break;
+ }
+
+ if (*I == '<')
+ {
+ I++;
+ Op = pkgCache::Dep::Less;
+ break;
+ }
+
+ // < is the same as <= and << is really Cs < for some reason
+ Op = pkgCache::Dep::LessEq;
+ break;
+
+ case '>':
+ I++;
+ if (*I == '=')
+ {
+ I++;
+ Op = pkgCache::Dep::GreaterEq;
+ break;
+ }
+
+ if (*I == '>')
+ {
+ I++;
+ Op = pkgCache::Dep::Greater;
+ break;
+ }
+
+ // > is the same as >= and >> is really Cs > for some reason
+ Op = pkgCache::Dep::GreaterEq;
+ break;
+
+ case '=':
+ Op = pkgCache::Dep::Equals;
+ I++;
+ break;
+
+ // HACK around bad package definitions
+ default:
+ Op = pkgCache::Dep::Equals;
+ break;
+ }
+ return I;
+}
+
+ /*}}}*/
+// ListParser::ParseDepends - Parse a dependency element /*{{{*/
+// ---------------------------------------------------------------------
+/* This parses the dependency elements out of a standard string in place,
+ bit by bit. */
+const char *debListParser::ParseDepends(const char *Start,const char *Stop,
+ string &Package,string &Ver,
+ unsigned int &Op, bool ParseArchFlags)
+{
+ // Strip off leading space
+ for (;Start != Stop && isspace(*Start) != 0; Start++);
+
+ // Parse off the package name
+ const char *I = Start;
+ for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
+ *I != ',' && *I != '|'; I++);
+
+ // Malformed, no '('
+ if (I != Stop && *I == ')')
+ return 0;
+
+ if (I == Start)
+ return 0;
+
+ // Stash the package name
+ Package.assign(Start,I - Start);
+
+ // Skip white space to the '('
+ for (;I != Stop && isspace(*I) != 0 ; I++);
+
+ // Parse a version
+ if (I != Stop && *I == '(')
+ {
+ // Skip the '('
+ for (I++; I != Stop && isspace(*I) != 0 ; I++);
+ if (I + 3 >= Stop)
+ return 0;
+ I = ConvertRelation(I,Op);
+
+ // Skip whitespace
+ for (;I != Stop && isspace(*I) != 0; I++);
+ Start = I;
+ for (;I != Stop && *I != ')'; I++);
+ if (I == Stop || Start == I)
+ return 0;
+
+ // Skip trailing whitespace
+ const char *End = I;
+ for (; End > Start && isspace(End[-1]); End--);
+
+ Ver = string(Start,End-Start);
+ I++;
+ }
+ else
+ {
+ Ver = string();
+ Op = pkgCache::Dep::NoOp;
+ }
+
+ // Skip whitespace
+ for (;I != Stop && isspace(*I) != 0; I++);
+
+ if (ParseArchFlags == true)
+ {
+ string arch = _config->Find("APT::Architecture");
+
+ // Parse an architecture
+ if (I != Stop && *I == '[')
+ {
+ // malformed
+ I++;
+ if (I == Stop)
+ return 0;
+
+ const char *End = I;
+ bool Found = false;
+ bool NegArch = false;
+ while (I != Stop)
+ {
+ // look for whitespace or ending ']'
+ while (End != Stop && !isspace(*End) && *End != ']')
+ End++;
+
+ if (End == Stop)
+ return 0;
+
+ if (*I == '!')
+ {
+ NegArch = true;
+ I++;
+ }
+
+ if (stringcmp(arch,I,End) == 0)
+ Found = true;
+
+ if (*End++ == ']') {
+ I = End;
+ break;
+ }
+
+ I = End;
+ for (;I != Stop && isspace(*I) != 0; I++);
+ }
+
+ if (NegArch)
+ Found = !Found;
+
+ if (Found == false)
+ Package = ""; /* not for this arch */
+ }
+
+ // Skip whitespace
+ for (;I != Stop && isspace(*I) != 0; I++);
+ }
+
+ if (I != Stop && *I == '|')
+ Op |= pkgCache::Dep::Or;
+
+ if (I == Stop || *I == ',' || *I == '|')
+ {
+ if (I != Stop)
+ for (I++; I != Stop && isspace(*I) != 0; I++);
+ return I;
+ }
+
+ return 0;
+}
+ /*}}}*/
+// ListParser::ParseDepends - Parse a dependency list /*{{{*/
+// ---------------------------------------------------------------------
+/* This is the higher level depends parser. It takes a tag and generates
+ a complete depends tree for the given version. */
+bool debListParser::ParseDepends(pkgCache::VerIterator Ver,
+ const char *Tag,unsigned int Type)
+{
+ const char *Start;
+ const char *Stop;
+ if (Section.Find(Tag,Start,Stop) == false)
+ return true;
+
+ string Package;
+ string Version;
+ unsigned int Op;
+
+ while (1)
+ {
+ Start = ParseDepends(Start,Stop,Package,Version,Op);
+ if (Start == 0)
+ return _error->Error("Problem parsing dependency %s",Tag);
+
+ if (NewDepends(Ver,Package,Version,Op,Type) == false)
+ return false;
+ if (Start == Stop)
+ break;
+ }
+ return true;
+}
+ /*}}}*/
+// ListParser::ParseProvides - Parse the provides list /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debListParser::ParseProvides(pkgCache::VerIterator Ver)
+{
+ const char *Start;
+ const char *Stop;
+ if (Section.Find("Provides",Start,Stop) == false)
+ return true;
+
+ string Package;
+ string Version;
+ unsigned int Op;
+
+ while (1)
+ {
+ Start = ParseDepends(Start,Stop,Package,Version,Op);
+ if (Start == 0)
+ return _error->Error("Problem parsing Provides line");
+ if (Op != pkgCache::Dep::NoOp)
+ return _error->Error("Malformed provides line");
+
+ if (NewProvides(Ver,Package,Version) == false)
+ return false;
+
+ if (Start == Stop)
+ break;
+ }
+
return true;
}
/*}}}*/
// ListParser::GrabWord - Matches a word and returns /*{{{*/
// ---------------------------------------------------------------------
/* Looks for a word in a list of words - for ParseStatus */
-bool debListParser::GrabWord(string Word,WordList *List,int Count,
- unsigned char &Out)
+bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out)
{
- for (int C = 0; C != Count; C++)
+ for (unsigned int C = 0; List[C].Str != 0; C++)
{
if (strcasecmp(Word.c_str(),List[C].Str) == 0)
{
/* This has to be carefull to only process the correct architecture */
bool debListParser::Step()
{
+ iOffset = Tags.Offset();
while (Tags.Step(Section) == true)
- {
- /* See if this is the correct Architecture, if it isnt then we
- drop the whole section */
+ {
+ /* See if this is the correct Architecture, if it isn't then we
+ drop the whole section. A missing arch tag only happens (in theory)
+ inside the Status file, so that is a positive return */
const char *Start;
const char *Stop;
if (Section.Find("Architecture",Start,Stop) == false)
return true;
-
- if (strncmp(Start,"i386",Stop - Start) == 0 &&
- strlen("i386") == (unsigned)(Stop - Start))
+
+ if (stringcmp(Arch,Start,Stop) == 0)
return true;
- if (strncmp(Start,"all",Stop - Start) == 0 &&
- 3 == (unsigned)(Stop - Start))
+ if (stringcmp(Start,Stop,"all") == 0)
return true;
+
+ iOffset = Tags.Offset();
}
return false;
}
/*}}}*/
+// ListParser::LoadReleaseInfo - Load the release information /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator FileI,
+ FileFd &File)
+{
+ pkgTagFile Tags(&File, File.Size() + 256); // XXX
+ pkgTagSection Section;
+ if (Tags.Step(Section) == false)
+ return false;
+
+ const char *Start;
+ const char *Stop;
+ if (Section.Find("Suite",Start,Stop) == true)
+ FileI->Archive = WriteUniqString(Start,Stop - Start);
+ if (Section.Find("Component",Start,Stop) == true)
+ FileI->Component = WriteUniqString(Start,Stop - Start);
+ if (Section.Find("Version",Start,Stop) == true)
+ FileI->Version = WriteUniqString(Start,Stop - Start);
+ if (Section.Find("Origin",Start,Stop) == true)
+ FileI->Origin = WriteUniqString(Start,Stop - Start);
+ if (Section.Find("Label",Start,Stop) == true)
+ FileI->Label = WriteUniqString(Start,Stop - Start);
+ if (Section.Find("Architecture",Start,Stop) == true)
+ FileI->Architecture = WriteUniqString(Start,Stop - Start);
+
+ if (Section.FindFlag("NotAutomatic",FileI->Flags,
+ pkgCache::Flag::NotAutomatic) == false)
+ _error->Warning("Bad NotAutomatic flag");
+
+ return !_error->PendingError();
+}
+ /*}}}*/
+// ListParser::GetPrio - Convert the priority from a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned char debListParser::GetPrio(string Str)
+{
+ unsigned char Out;
+ if (GrabWord(Str,PrioList,Out) == false)
+ Out = pkgCache::State::Extra;
+
+ return Out;
+}
+ /*}}}*/
HCoop / ntk / apt.git / blobdiff