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Merge #6557

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6557: Add tests for `CPacker` error handling, fix minor bug, minor refactoring r=def- a=Robyt3

Closes #6525.

## Checklist

- [X] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [X] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Robert Müller <robytemueller@gmail.com>
This commit is contained in:
bors[bot] 2023-05-03 18:17:49 +00:00 committed by GitHub
parent ab83a04348 c5e336f5e2
commit b3f384f312
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 73 additions and 19 deletions
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28
src/engine/shared/packer.cpp
View file

@ -7,7 +7,7 @@
void CPacker::Reset()
{
m_Error = 0;
m_Error = false;
m_pCurrent = m_aBuffer;
m_pEnd = m_pCurrent + PACKER_BUFFER_SIZE;
}
@ -20,7 +20,7 @@ void CPacker::AddInt(int i)
unsigned char *pNext = CVariableInt::Pack(m_pCurrent, i, m_pEnd - m_pCurrent);
if(!pNext)
{
m_Error = 1;
m_Error = true;
return;
}
m_pCurrent = pNext;
@ -51,7 +51,7 @@ void CPacker::AddString(const char *pStr, int Limit)
// Ensure space for the null termination.
if(m_pEnd - m_pCurrent < Length + 1)
{
m_Error = 1;
m_Error = true;
break;
}
Length = str_utf8_encode((char *)m_pCurrent, Codepoint);
@ -66,9 +66,9 @@ void CPacker::AddRaw(const void *pData, int Size)
if(m_Error)
return;
if(m_pCurrent + Size >= m_pEnd)
if(m_pCurrent + Size > m_pEnd)
{
m_Error = 1;
m_Error = true;
return;
}
@ -82,7 +82,7 @@ void CPacker::AddRaw(const void *pData, int Size)
void CUnpacker::Reset(const void *pData, int Size)
{
m_Error = 0;
m_Error = false;
m_pStart = (const unsigned char *)pData;
m_pEnd = m_pStart + Size;
m_pCurrent = m_pStart;
@ -95,7 +95,7 @@ int CUnpacker::GetInt()
if(m_pCurrent >= m_pEnd)
{
m_Error = 1;
m_Error = true;
return 0;
}
@ -103,7 +103,7 @@ int CUnpacker::GetInt()
const unsigned char *pNext = CVariableInt::Unpack(m_pCurrent, &i, m_pEnd - m_pCurrent);
if(!pNext)
{
m_Error = 1;
m_Error = true;
return 0;
}
m_pCurrent = pNext;
@ -128,14 +128,14 @@ int CUnpacker::GetUncompressedInt()
if(m_Error)
return 0;
if(m_pCurrent + 4 > m_pEnd)
if(m_pCurrent + sizeof(int) > m_pEnd)
{
m_Error = 1;
m_Error = true;
return 0;
}
int i = *(int *)m_pCurrent;
m_pCurrent += 4;
m_pCurrent += sizeof(int);
return i;
}
@ -159,7 +159,7 @@ const char *CUnpacker::GetString(int SanitizeType)
if(m_pCurrent >= m_pEnd)
{
m_Error = 1;
m_Error = true;
return "";
}
@ -169,7 +169,7 @@ const char *CUnpacker::GetString(int SanitizeType)
m_pCurrent++;
if(m_pCurrent == m_pEnd)
{
m_Error = 1;
m_Error = true;
return "";
}
}
@ -192,7 +192,7 @@ const unsigned char *CUnpacker::GetRaw(int Size)
// check for nasty sizes
if(Size < 0 || m_pCurrent + Size > m_pEnd)
{
m_Error = 1;
m_Error = true;
return 0;
}

6
src/engine/shared/packer.h
View file

@ -15,12 +15,12 @@ private:
unsigned char m_aBuffer[PACKER_BUFFER_SIZE];
unsigned char *m_pCurrent;
unsigned char *m_pEnd;
int m_Error;
bool m_Error;
public:
void Reset();
void AddInt(int i);
void AddString(const char *pStr, int Limit);
void AddString(const char *pStr, int Limit = PACKER_BUFFER_SIZE);
void AddRaw(const void *pData, int Size);
int Size() const { return (int)(m_pCurrent - m_aBuffer); }
@ -33,7 +33,7 @@ class CUnpacker
const unsigned char *m_pStart;
const unsigned char *m_pCurrent;
const unsigned char *m_pEnd;
int m_Error;
bool m_Error;
public:
enum

58
src/test/packer.cpp
View file

@ -32,7 +32,7 @@ static void ExpectAddInt(int Input, int Expected)
CPacker Packer;
Packer.Reset();
Packer.AddInt(Input);
EXPECT_EQ(Packer.Error(), 0);
EXPECT_EQ(Packer.Error(), false);
ASSERT_EQ(Packer.Size(), 1);
EXPECT_EQ(Packer.Data()[0], Expected);
}
@ -42,7 +42,7 @@ static void ExpectAddExtendedInt(int Input, unsigned char *pExpected, int Size)
CPacker Packer;
Packer.Reset();
Packer.AddInt(Input);
EXPECT_EQ(Packer.Error(), 0);
EXPECT_EQ(Packer.Error(), false);
ASSERT_EQ(Packer.Size(), Size);
EXPECT_EQ(mem_comp(Packer.Data(), pExpected, Size), 0);
}
@ -242,3 +242,57 @@ TEST(Packer, AddStringBroken)
ExpectAddString5("\x80\x80", 5, "<EFBFBD>");
ExpectAddString5("\x80\x80", 6, 0);
}
TEST(Packer, Error)
{
char aData[CPacker::PACKER_BUFFER_SIZE];
mem_zero(aData, sizeof(aData));
{
CPacker Packer;
Packer.Reset();
EXPECT_EQ(Packer.Error(), false);
Packer.AddRaw(aData, sizeof(aData) - 1);
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData) - 1);
Packer.AddInt(1);
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData));
Packer.AddInt(2);
EXPECT_EQ(Packer.Error(), true);
Packer.AddInt(3);
EXPECT_EQ(Packer.Error(), true);
}
{
CPacker Packer;
Packer.Reset();
EXPECT_EQ(Packer.Error(), false);
Packer.AddRaw(aData, sizeof(aData) - 1);
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData) - 1);
Packer.AddRaw(aData, 1);
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData));
Packer.AddRaw(aData, 1);
EXPECT_EQ(Packer.Error(), true);
Packer.AddRaw(aData, 1);
EXPECT_EQ(Packer.Error(), true);
}
{
CPacker Packer;
Packer.Reset();
EXPECT_EQ(Packer.Error(), false);
Packer.AddRaw(aData, sizeof(aData) - 5);
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData) - 5);
Packer.AddString("test");
EXPECT_EQ(Packer.Error(), false);
EXPECT_EQ(Packer.Size(), sizeof(aData));
Packer.AddString("test");
EXPECT_EQ(Packer.Error(), true);
Packer.AddString("test");
EXPECT_EQ(Packer.Error(), true);
}
}