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Useful scan #101

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Merged
temisu merged 1 commit into from
Sep 20, 2026
Merged

Useful scan #101

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139 changes: 47 additions & 92 deletions main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,14 +22,6 @@

#include <ancient/ancient.hpp>

// enables scanning. Useful for testing/debugging. Not so useful otherwise
// Not good for default since creates dependency for dirent (i.e. windows blues)
//#define ENABLE_SCAN 1

#ifdef ENABLE_SCAN
#include <dirent.h>
#endif

static std::unique_ptr<std::vector<uint8_t>> readFile(const std::string &fileName)
{
std::unique_ptr<std::vector<uint8_t>> ret=std::make_unique<std::vector<uint8_t>>();
Expand Down Expand Up @@ -100,12 +92,10 @@ int main(int argc,char **argv)
" - verifies decompression against known good unpacked file\n"
"Usage: ancient [-p] d[ecompress] packed_input_file output_file\n"
" - decompresses single file\n"
" - use p-flag to preserve timestamp of the original\n");
#ifdef ENABLE_SCAN
fprintf(stderr, "Usage: ancient s[can] input_dir output_dir\n"
" - scans input directory recursively and stores all found\n"
" - known compressed streams to separate files in output directory\n");
#endif
" - use p-flag to preserve timestamp of the original\n"
"Usage: ancient s[can] input_file output_file_template\n"
" - scans input file and stores all found known compressed\n"
" streams to separate files\n");
};


Expand Down Expand Up @@ -234,97 +224,62 @@ int main(int argc,char **argv)
printf("Files match!\n");
return 0;
}
}
#ifdef ENABLE_SCAN
else if (cmd=="s" || cmd=="scan") {
} else if (cmd=="s" || cmd=="scan") {
if (argc!=4)
{
usage();
return -1;
}
uint32_t fileIndex=0;
std::function<void(std::string)> processDir=[&](std::string inputDir)
auto packed {readFile(argv[2])};
if (!packed)
return -1;
for (size_t i=0;i<packed->size();)
{
auto opendir=[](const char *f)->DIR* {
return ::opendir(f);
};

auto closedir=[](DIR *d)->int {
return ::closedir(d);
};

std::unique_ptr<DIR,decltype(closedir)> dir{opendir(inputDir.c_str()),closedir};
if (dir)
// We will detect first, before trying the format for real
if (!ancient::Decompressor::detect(packed->data()+i,packed->size()-i))
{
while (struct dirent *de=::readdir(dir.get()))
{
std::string subName(de->d_name);
if (subName=="." || subName=="..") continue;
std::string name=inputDir+"/"+subName;
struct stat st;
if (stat(name.c_str(),&st)<0) continue;
if (st.st_mode&S_IFDIR)
{
processDir(name);
} else if (st.st_mode&S_IFREG) {
auto packed{readFile(name)};
if (!packed) return -1;
for (size_t i=0;i<packed->size();)
{
// We will detect first, before trying the format for real
if (!ancient::Decompressor::detect(packed->data()+i,packed->size()-i))
{
i++;
continue;
}
try
{
ancient::Decompressor decompressor{packed->data()+i,packed->size()-i,false,true};
i++;
continue;
}
try
{
ancient::Decompressor decompressor{packed->data()+i,packed->size()-i,false,true};

printf("trying %s\n",decompressor.getName().c_str());
if (!decompressor.getPackedSize())
{
// for formats that do not encode packed size.
// we will get it from decompressor
decompressor.decompress(true);
}
printf("trying %s\n",decompressor.getName().c_str());
if (!decompressor.getPackedSize())
{
// for formats that do not encode packed size.
// we will get it from decompressor
decompressor.decompress(true);
}

// final checks with the limited buffer and fresh decompressor
const uint8_t *finalData=packed->data()+i;
size_t finalSize=decompressor.getPackedSize().value();
ancient::Decompressor decompressor2{finalData,finalSize,true,true};
try
{
decompressor2.decompress(true);
} catch (const std::bad_alloc&) {
fprintf(stderr,"Out of memory\n");
i++;
continue;
}
std::string outputName=std::string(argv[3])+"/file"+std::to_string(fileIndex++)+".pack";
printf("Found compressed stream at %zu, size %zu in file %s with type '%s', storing it into %s\n",i,decompressor2.getPackedSize().value(),name.c_str(),decompressor2.getName().c_str(),outputName.c_str());
writeFile(outputName,finalData,finalSize);
i+=finalSize;
continue;
} catch (const ancient::Error&) {
// full steam ahead (with next offset)
} catch (const std::bad_alloc&) {
// full steam ahead (with next offset)
}
i++;
}
}
// final checks with the limited buffer and fresh decompressor
const uint8_t *finalData=packed->data()+i;
size_t finalSize=decompressor.getPackedSize().value();
ancient::Decompressor decompressor2{finalData,finalSize,true,true};
try
{
decompressor2.decompress(true);
} catch (const std::bad_alloc&) {
fprintf(stderr,"Out of memory\n");
i++;
continue;
}
} else {
fprintf(stderr,"Could not process directory %s\n",inputDir.c_str());
std::string outputName=std::string(argv[3])+std::to_string(fileIndex++)+".pack";
printf("Found compressed stream at %zu, size %zu in file %s with type '%s', storing it into %s\n",i,decompressor2.getPackedSize().value(),argv[2],decompressor2.getName().c_str(),outputName.c_str());
writeFile(outputName,finalData,finalSize);
i+=finalSize;
continue;
} catch (const ancient::Error&) {
// full steam ahead (with next offset)
} catch (const std::bad_alloc&) {
// full steam ahead (with next offset)
}
};

processDir(std::string(argv[2]));
i++;
}
return 0;
}
#endif
else {
} else {
fprintf(stderr,"Unknown command\n");
usage();
return -1;
Expand Down
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