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elf2rpl: Add support for section deflation.

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This commit is contained in:
James Benton 2018-05-24 23:32:35 +01:00
parent 55b2695eaf
commit d6478d831e
1 changed files with 64 additions and 4 deletions
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68
tools/elf2rpl/main.cpp
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@ -10,9 +10,10 @@
#include <vector>
#include <zlib.h>
constexpr auto CodeBaseAddress = 0x02000000;
constexpr auto DataBaseAddress = 0x10000000;
constexpr auto LoadBaseAddress = 0xC0000000;
constexpr auto DeflateMinSectionSize = 0x18u;
constexpr auto CodeBaseAddress = 0x02000000u;
constexpr auto DataBaseAddress = 0x10000000u;
constexpr auto LoadBaseAddress = 0xC0000000u;
struct ElfFile
{
@ -548,7 +549,6 @@ fixRelocations(ElfFile &file)
}
}
section->data.insert(section->data.end(),
reinterpret_cast<char *>(newRelocations.data()),
reinterpret_cast<char *>(newRelocations.data() + newRelocations.size()));
@ -721,6 +721,61 @@ fixLoaderVirtualAddresses(ElfFile &file)
return true;
}
static bool
deflateSections(ElfFile &file)
{
std::vector<char> chunk;
chunk.resize(16 * 1024);
for (auto &section : file.sections) {
if (section->data.size() < DeflateMinSectionSize ||
section->header.type == elf::SHT_RPL_CRCS ||
section->header.type == elf::SHT_RPL_FILEINFO) {
continue;
}
// Allocate space for the 4 bytes inflated size
std::vector<char> deflated;
deflated.resize(4);
// Deflate section data
auto stream = z_stream { };
memset(&stream, 0, sizeof(stream));
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = Z_NULL;
deflateInit(&stream, 6);
stream.avail_in = section->data.size();
stream.next_in = reinterpret_cast<Bytef *>(section->data.data());
do {
stream.avail_out = static_cast<uInt>(chunk.size());
stream.next_out = reinterpret_cast<Bytef *>(chunk.data());
auto ret = deflate(&stream, Z_FINISH);
if (ret == Z_STREAM_ERROR) {
deflateEnd(&stream);
return false;
}
deflated.insert(deflated.end(),
chunk.data(),
reinterpret_cast<char *>(stream.next_out));
} while (stream.avail_out == 0);
deflateEnd(&stream);
// Set the inflated size at start of section
*reinterpret_cast<be_val<uint32_t> *>(&deflated[0]) =
static_cast<uint32_t>(section->data.size());
// Update the section data
section->data = std::move(deflated);
section->header.flags |= elf::SHF_DEFLATED;
}
return true;
}
/**
* Calculate section file offsets.
@ -943,6 +998,11 @@ int main(int argc, const char **argv)
return -1;
}
if (!deflateSections(elf)) {
fmt::print("ERROR: deflateSections failed");
return -1;
}
if (!calculateSectionOffsets(elf)) {
fmt::print("ERROR: calculateSectionOffsets failed");
return -1;