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-rw-r--r--apt-pkg/tagfile.cc249
-rw-r--r--apt-pkg/tagfile.h23
-rw-r--r--test/libapt/tagfile_test.cc61
3 files changed, 290 insertions, 43 deletions
diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index d5e61baf4..7a263c2b7 100644
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -18,6 +18,8 @@
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
+#include <list>
+
#include <string>
#include <stdio.h>
#include <ctype.h>
@@ -29,33 +31,45 @@
using std::string;
-class pkgTagFilePrivate
+class APT_HIDDEN pkgTagFilePrivate /*{{{*/
{
public:
- void Reset(FileFd * const pFd, unsigned long long const pSize)
+ void Reset(FileFd * const pFd, unsigned long long const pSize, pkgTagFile::Flags const pFlags)
{
if (Buffer != NULL)
free(Buffer);
Buffer = NULL;
Fd = pFd;
+ Flags = pFlags;
Start = NULL;
End = NULL;
Done = false;
iOffset = 0;
Size = pSize;
+ isCommentedLine = false;
+ chunks.clear();
}
- pkgTagFilePrivate(FileFd * const pFd, unsigned long long const Size) : Buffer(NULL)
+ pkgTagFilePrivate(FileFd * const pFd, unsigned long long const Size, pkgTagFile::Flags const pFlags) : Buffer(NULL)
{
- Reset(pFd, Size);
+ Reset(pFd, Size, pFlags);
}
FileFd * Fd;
+ pkgTagFile::Flags Flags;
char *Buffer;
char *Start;
char *End;
bool Done;
unsigned long long iOffset;
unsigned long long Size;
+ bool isCommentedLine;
+ struct FileChunk
+ {
+ bool const good;
+ size_t length;
+ FileChunk(bool const pgood, size_t const plength) : good(pgood), length(plength) {}
+ };
+ std::list<FileChunk> chunks;
~pkgTagFilePrivate()
{
@@ -63,8 +77,8 @@ public:
free(Buffer);
}
};
-
-class pkgTagSectionPrivate
+ /*}}}*/
+class APT_HIDDEN pkgTagSectionPrivate /*{{{*/
{
public:
pkgTagSectionPrivate()
@@ -80,6 +94,7 @@ public:
};
std::vector<TagData> Tags;
};
+ /*}}}*/
static unsigned long AlphaHash(const char *Text, size_t Length) /*{{{*/
{
@@ -98,21 +113,23 @@ static unsigned long AlphaHash(const char *Text, size_t Length) /*{{{*/
/*}}}*/
// TagFile::pkgTagFile - Constructor /*{{{*/
-// ---------------------------------------------------------------------
-/* */
+pkgTagFile::pkgTagFile(FileFd * const pFd,pkgTagFile::Flags const pFlags, unsigned long long const Size)
+ : d(new pkgTagFilePrivate(pFd, Size + 4, pFlags))
+{
+ Init(pFd, pFlags, Size);
+}
pkgTagFile::pkgTagFile(FileFd * const pFd,unsigned long long const Size)
- : d(new pkgTagFilePrivate(pFd, Size + 4))
+ : pkgTagFile(pFd, pkgTagFile::STRICT, Size)
{
- Init(pFd, Size);
}
-void pkgTagFile::Init(FileFd * const pFd,unsigned long long Size)
+void pkgTagFile::Init(FileFd * const pFd, pkgTagFile::Flags const pFlags, unsigned long long Size)
{
/* The size is increased by 4 because if we start with the Size of the
filename we need to try to read 1 char more to see an EOF faster, 1
char the end-pointer can be on and maybe 2 newlines need to be added
to the end of the file -> 4 extra chars */
Size += 4;
- d->Reset(pFd, Size);
+ d->Reset(pFd, Size, pFlags);
if (d->Fd->IsOpen() == false)
d->Start = d->End = d->Buffer = 0;
@@ -129,10 +146,12 @@ void pkgTagFile::Init(FileFd * const pFd,unsigned long long Size)
if (d->Done == false)
Fill();
}
+void pkgTagFile::Init(FileFd * const pFd,unsigned long long Size)
+{
+ Init(pFd, pkgTagFile::STRICT, Size);
+}
/*}}}*/
// TagFile::~pkgTagFile - Destructor /*{{{*/
-// ---------------------------------------------------------------------
-/* */
pkgTagFile::~pkgTagFile()
{
delete d;
@@ -162,7 +181,7 @@ bool pkgTagFile::Resize(unsigned long long const newSize)
unsigned long long const EndSize = d->End - d->Start;
// get new buffer and use it
- char* newBuffer = (char*)realloc(d->Buffer, sizeof(char) * newSize);
+ char* const newBuffer = static_cast<char*>(realloc(d->Buffer, sizeof(char) * newSize));
if (newBuffer == NULL)
return false;
d->Buffer = newBuffer;
@@ -199,8 +218,35 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
} while (Tag.Scan(d->Start,d->End - d->Start, false) == false);
}
- d->Start += Tag.size();
- d->iOffset += Tag.size();
+ size_t tagSize = Tag.size();
+ d->Start += tagSize;
+
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) == 0)
+ d->iOffset += tagSize;
+ else
+ {
+ auto first = d->chunks.begin();
+ for (; first != d->chunks.end(); ++first)
+ {
+ if (first->good == false)
+ d->iOffset += first->length;
+ else
+ {
+ if (tagSize < first->length)
+ {
+ first->length -= tagSize;
+ d->iOffset += tagSize;
+ break;
+ }
+ else
+ {
+ tagSize -= first->length;
+ d->iOffset += first->length;
+ }
+ }
+ }
+ d->chunks.erase(d->chunks.begin(), first);
+ }
Tag.Trim();
return true;
@@ -210,49 +256,166 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
// ---------------------------------------------------------------------
/* This takes the bit at the end of the buffer and puts it at the start
then fills the rest from the file */
+static bool FillBuffer(pkgTagFilePrivate * const d)
+{
+ unsigned long long Actual = 0;
+ // See if only a bit of the file is left
+ unsigned long long const dataSize = d->Size - ((d->End - d->Buffer) + 1);
+ if (d->Fd->Read(d->End, dataSize, &Actual) == false)
+ return false;
+ if (Actual != dataSize)
+ d->Done = true;
+ d->End += Actual;
+ return true;
+}
+static void RemoveCommentsFromBuffer(pkgTagFilePrivate * const d)
+{
+ // look for valid comments in the buffer
+ char * good_start = nullptr, * bad_start = nullptr;
+ char * current = d->Start;
+ if (d->isCommentedLine == false)
+ {
+ if (d->Start == d->Buffer)
+ {
+ // the start of the buffer is a newline as a record can't start
+ // in the middle of a line by definition.
+ if (*d->Start == '#')
+ {
+ d->isCommentedLine = true;
+ ++current;
+ if (current > d->End)
+ d->chunks.emplace_back(false, 1);
+ }
+ }
+ if (d->isCommentedLine == false)
+ good_start = d->Start;
+ else
+ bad_start = d->Start;
+ }
+ else
+ bad_start = d->Start;
+
+ std::vector<std::pair<char*, size_t>> good_parts;
+ while (current <= d->End)
+ {
+ size_t const restLength = (d->End - current) + 1;
+ if (d->isCommentedLine == false)
+ {
+ current = static_cast<char*>(memchr(current, '#', restLength));
+ if (current == nullptr)
+ {
+ size_t const goodLength = d->End - good_start;
+ d->chunks.emplace_back(true, goodLength);
+ if (good_start != d->Start)
+ good_parts.push_back(std::make_pair(good_start, goodLength));
+ break;
+ }
+ bad_start = current;
+ --current;
+ // ensure that this is really a comment and not a '#' in the middle of a line
+ if (*current == '\n')
+ {
+ size_t const goodLength = (current - good_start) + 1;
+ d->chunks.emplace_back(true, goodLength);
+ good_parts.push_back(std::make_pair(good_start, goodLength));
+ good_start = nullptr;
+ d->isCommentedLine = true;
+ }
+ current += 2;
+ }
+ else // the current line is a comment
+ {
+ current = static_cast<char*>(memchr(current, '\n', restLength));
+ if (current == nullptr)
+ {
+ d->chunks.emplace_back(false, (d->End - bad_start));
+ break;
+ }
+ ++current;
+ // is the next line a comment, too?
+ if (current > d->End || *current != '#')
+ {
+ d->chunks.emplace_back(false, (current - bad_start));
+ good_start = current;
+ bad_start = nullptr;
+ d->isCommentedLine = false;
+ }
+ ++current;
+ }
+ }
+
+ if (good_parts.empty() == false)
+ {
+ // we found comments, so move later parts over them
+ current = d->Start;
+ for (auto const &good: good_parts)
+ {
+ memmove(current, good.first, good.second);
+ current += good.second;
+ }
+ d->End = current;
+ }
+
+ if (d->isCommentedLine == true)
+ {
+ // deal with a buffer containing only comments
+ // or an (unfinished) comment at the end
+ if (good_parts.empty() == true)
+ d->End = d->Start;
+ else
+ d->Start = d->End;
+ }
+ else
+ {
+ // the buffer was all comment, but ended with the buffer
+ if (good_parts.empty() == true && good_start >= d->End)
+ d->End = d->Start;
+ else
+ d->Start = d->End;
+ }
+}
bool pkgTagFile::Fill()
{
- unsigned long long EndSize = d->End - d->Start;
+ unsigned long long const EndSize = d->End - d->Start;
+ if (EndSize != 0)
+ {
+ memmove(d->Buffer,d->Start,EndSize);
+ d->Start = d->End = d->Buffer + EndSize;
+ }
+ else
+ d->Start = d->End = d->Buffer;
+
unsigned long long Actual = 0;
-
- memmove(d->Buffer,d->Start,EndSize);
- d->Start = d->Buffer;
- d->End = d->Buffer + EndSize;
-
- if (d->Done == false)
+ while (d->Done == false && d->Size > (Actual + 1))
{
- // See if only a bit of the file is left
- unsigned long long const dataSize = d->Size - ((d->End - d->Buffer) + 1);
- if (d->Fd->Read(d->End, dataSize, &Actual) == false)
+ if (FillBuffer(d) == false)
return false;
- if (Actual != dataSize)
- d->Done = true;
- d->End += Actual;
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) != 0)
+ RemoveCommentsFromBuffer(d);
+ Actual = d->End - d->Buffer;
}
-
+ d->Start = d->Buffer;
+
if (d->Done == true)
{
if (EndSize <= 3 && Actual == 0)
return false;
if (d->Size - (d->End - d->Buffer) < 4)
return true;
-
+
// Append a double new line if one does not exist
unsigned int LineCount = 0;
for (const char *E = d->End - 1; E - d->End < 6 && (*E == '\n' || *E == '\r'); E--)
if (*E == '\n')
- LineCount++;
+ ++LineCount;
if (LineCount < 2)
{
- if ((unsigned)(d->End - d->Buffer) >= d->Size)
+ if (static_cast<unsigned long long>(d->End - d->Buffer) >= d->Size)
Resize(d->Size + 3);
- for (; LineCount < 2; LineCount++)
+ for (; LineCount < 2; ++LineCount)
*d->End++ = '\n';
}
-
- return true;
}
-
return true;
}
/*}}}*/
@@ -262,8 +425,9 @@ bool pkgTagFile::Fill()
that is there */
bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
{
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) == 0 &&
// We are within a buffer space of the next hit..
- if (Offset >= d->iOffset && d->iOffset + (d->End - d->Start) > Offset)
+ Offset >= d->iOffset && d->iOffset + (d->End - d->Start) > Offset)
{
unsigned long long Dist = Offset - d->iOffset;
d->Start += Dist;
@@ -281,7 +445,9 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
if (d->Fd->Seek(Offset) == false)
return false;
d->End = d->Start = d->Buffer;
-
+ d->isCommentedLine = false;
+ d->chunks.clear();
+
if (Fill() == false)
return false;
@@ -644,11 +810,12 @@ bool pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag,
return true;
}
/*}}}*/
-void pkgTagSection::Get(const char *&Start,const char *&Stop,unsigned int I) const
+void pkgTagSection::Get(const char *&Start,const char *&Stop,unsigned int I) const/*{{{*/
{
Start = Section + d->Tags[I].StartTag;
Stop = Section + d->Tags[I+1].StartTag;
}
+ /*}}}*/
APT_PURE unsigned int pkgTagSection::Count() const { /*{{{*/
if (d->Tags.empty() == true)
return 0;
diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index 922b56f8e..2f26846ef 100644
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -34,7 +34,15 @@
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;
@@ -139,7 +147,10 @@ class 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 +159,22 @@ 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();
};
diff --git a/test/libapt/tagfile_test.cc b/test/libapt/tagfile_test.cc
index 064e91b79..24fbd389e 100644
--- a/test/libapt/tagfile_test.cc
+++ b/test/libapt/tagfile_test.cc
@@ -40,6 +40,10 @@ TEST(TagFileTest,SingleField)
EXPECT_EQ(0, section.Count());
EXPECT_FALSE(section.Exists("FieldA-12345678"));
EXPECT_FALSE(section.Exists("FieldB-12345678"));
+
+ createTemporaryFile("emptyfile", fd, NULL, NULL);
+ ASSERT_FALSE(tfile.Step(section));
+ EXPECT_EQ(0, section.Count());
}
TEST(TagFileTest,MultipleSections)
@@ -222,3 +226,60 @@ TEST(TagFileTest, SpacesEverywhere)
// overridden values are still present, but not really accessible
EXPECT_EQ(12, section.Count());
}
+
+TEST(TagFileTest, Comments)
+{
+ FileFd fd;
+ createTemporaryFile("commentfile", fd, NULL, "# Leading comments should be ignored.\n"
+"\n"
+"Source: foo\n"
+"#Package: foo\n"
+"Section: bar\n"
+"#Section: overriden\n"
+"Priority: optional\n"
+"Build-Depends: debhelper,\n"
+"# apt-utils, (temporarily disabled)\n"
+" apt\n"
+"\n"
+"# Comments in the middle shouldn't result in extra blank paragraphs either.\n"
+"\n"
+"# Ditto.\n"
+"\n"
+"# A comment at the top of a paragraph should be ignored.\n"
+"Package: foo\n"
+"Architecture: any\n"
+"Description: An awesome package\n"
+" # This should still appear in the result.\n"
+"# this one shouldn't\n"
+" Blah, blah, blah. # but this again.\n"
+"# A comment at the end of a paragraph should be ignored.\n"
+"\n"
+"# Trailing comments shouldn't cause extra blank paragraphs."
+ );
+
+ pkgTagFile tfile(&fd, pkgTagFile::SUPPORT_COMMENTS, 1);
+ pkgTagSection section;
+ EXPECT_TRUE(tfile.Step(section));
+ EXPECT_FALSE(section.Exists("Package"));
+ EXPECT_TRUE(section.Exists("Source"));
+ EXPECT_EQ("foo", section.FindS("Source"));
+ EXPECT_TRUE(section.Exists("Section"));
+ EXPECT_EQ("bar", section.FindS("Section"));
+ EXPECT_TRUE(section.Exists("Priority"));
+ EXPECT_EQ("optional", section.FindS("Priority"));
+ EXPECT_TRUE(section.Exists("Build-Depends"));
+ EXPECT_EQ("debhelper,\n apt", section.FindS("Build-Depends"));
+
+ EXPECT_TRUE(tfile.Step(section));
+ EXPECT_FALSE(section.Exists("Source"));
+ EXPECT_TRUE(section.Exists("Package"));
+ EXPECT_EQ("foo", section.FindS("Package"));
+ EXPECT_FALSE(section.Exists("Section"));
+ EXPECT_TRUE(section.Exists("Architecture"));
+ EXPECT_EQ("any", section.FindS("Architecture"));
+ EXPECT_FALSE(section.Exists("Build-Depends"));
+ EXPECT_TRUE(section.Exists("Description"));
+ EXPECT_EQ("An awesome package\n # This should still appear in the result.\n Blah, blah, blah. # but this again.", section.FindS("Description"));
+
+ EXPECT_FALSE(tfile.Step(section));
+}
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