Apple-2-SW/dot_clean
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dot clean - don’t modify mapped memory.

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This commit is contained in:
Kelvin Sherlock 2017-03-04 14:06:24 -05:00
parent 867ca97246
commit 855c19eda5
1 changed files with 29 additions and 14 deletions
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43
dot_clean.cpp
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@ -118,36 +118,45 @@ void one_file(const std::string &data, const std::string &rsrc) noexcept try {
return;
}
mapped_file mf(rsrc, mapped_file::priv, rsrc_st.st_size);
mapped_file mf(rsrc, mapped_file::readonly, rsrc_st.st_size);
if (mf.size() < sizeof(ASHeader)) throw_not_apple_double();
ASHeader *header = (ASHeader *)mf.data();
header->magicNum = ntohl(header->magicNum);
header->versionNum = ntohl(header->versionNum);
header->numEntries = ntohs(header->numEntries);
ASHeader header;
{
ASHeader *tmp = (ASHeader *)mf.data();
header.magicNum = ntohl(tmp->magicNum);
header.versionNum = ntohl(tmp->versionNum);
header.numEntries = ntohs(tmp->numEntries);
}
if (header->magicNum != APPLEDOUBLE_MAGIC)
if (header.magicNum != APPLEDOUBLE_MAGIC)
throw_not_apple_double();
// v 2 is a super set of v1. v1 had type 7 for os-specific info, since split into
// separate entries.
if (header->versionNum != 0x00010000 && header->versionNum != 0x00020000)
if (header.versionNum != 0x00010000 && header.versionNum != 0x00020000)
throw_not_apple_double();
if (header->numEntries * sizeof(ASEntry) + sizeof(ASHeader) > mf.size()) throw_eof();
if (header.numEntries * sizeof(ASEntry) + sizeof(ASHeader) > mf.size()) throw_eof();
ASEntry *begin = (ASEntry *)(mf.data() + sizeof(ASHeader));
ASEntry *end = &begin[header->numEntries];
ASEntry *end = &begin[header.numEntries];
std::for_each(begin, end, [&mf](ASEntry &e){
e.entryID = ntohl(e.entryID);
e.entryOffset = ntohl(e.entryOffset);
e.entryLength = ntohl(e.entryLength);
std::for_each(begin, end, [&mf](const ASEntry &tmp){
ASEntry e;
e.entryID = ntohl(tmp.entryID);
e.entryOffset = ntohl(tmp.entryOffset);
e.entryLength = ntohl(tmp.entryLength);
// and check for truncation.
if (!e.entryLength) return;
@ -162,7 +171,13 @@ void one_file(const std::string &data, const std::string &rsrc) noexcept try {
fi_ok = fi.open(data, false);
std::for_each(begin, end, [&](ASEntry &e){
std::for_each(begin, end, [&](const ASEntry &tmp){
ASEntry e;
e.entryID = ntohl(tmp.entryID);
e.entryOffset = ntohl(tmp.entryOffset);
e.entryLength = ntohl(tmp.entryLength);
if (e.entryLength == 0) return;
switch(e.entryID) {