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cmSystemTools: rewrite RemoveRPath using DyanmicEntryList methods

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This commit is contained in:
James Cowgill 2016-10-05 17:19:43 +01:00 committed by Brad King
parent 72eb6a374e
commit b8b1d15186
1 changed files with 17 additions and 35 deletions
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52
Source/cmSystemTools.cxx
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@ -2518,9 +2518,9 @@ bool cmSystemTools::RemoveRPath(std::string const& file, std::string* emsg,
std::swap(se[0], se[1]);
}
// Get the size of the dynamic section header.
unsigned int count = elf.GetDynamicEntryCount();
if (count == 0) {
// Obtain a copy of the dynamic entries
cmELF::DynamicEntryList dentries = elf.GetDynamicEntries();
if (dentries.empty()) {
// This should happen only for invalid ELF files where a DT_NULL
// appears before the end of the table.
if (emsg) {
@ -2536,40 +2536,22 @@ bool cmSystemTools::RemoveRPath(std::string const& file, std::string* emsg,
zeroSize[i] = se[i]->Size;
}
// Get the range of file positions corresponding to each entry and
// the rest of the table after them.
unsigned long entryBegin[3] = { 0, 0, 0 };
unsigned long entryEnd[2] = { 0, 0 };
for (int i = 0; i < se_count; ++i) {
entryBegin[i] = elf.GetDynamicEntryPosition(se[i]->IndexInSection);
entryEnd[i] = elf.GetDynamicEntryPosition(se[i]->IndexInSection + 1);
}
entryBegin[se_count] = elf.GetDynamicEntryPosition(count);
// The data are to be written over the old table entries starting at
// the first one being removed.
bytesBegin = entryBegin[0];
unsigned long bytesEnd = entryBegin[se_count];
// Allocate a buffer to hold the part of the file to be written.
// Initialize it with zeros.
bytes.resize(bytesEnd - bytesBegin, 0);
// Read the part of the DYNAMIC section header that will move.
// The remainder of the buffer will be left with zeros which
// represent a DT_NULL entry.
char* data = &bytes[0];
for (int i = 0; i < se_count; ++i) {
// Read data between the entries being removed.
unsigned long sz = entryBegin[i + 1] - entryEnd[i];
if (sz > 0 && !elf.ReadBytes(entryEnd[i], sz, data)) {
if (emsg) {
*emsg = "Failed to read DYNAMIC section header.";
}
return false;
// Adjust the entry list as necessary to remove the run path
unsigned long entriesErased = 0;
for (cmELF::DynamicEntryList::iterator it = dentries.begin();
it != dentries.end();) {
if (it->first == cmELF::TagRPath || it->first == cmELF::TagRunPath) {
it = dentries.erase(it);
entriesErased++;
continue;
} else {
it++;
}
data += sz;
}
// Encode new entries list
bytes = elf.EncodeDynamicEntries(dentries);
bytesBegin = elf.GetDynamicEntryPosition(0);
}
// Open the file for update.