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#include <string.h>
#include "zip_dir.h"
#include "logger.h"
#include "chunk.h"
#include "exception.h"
#include "ioexception.h"
#include "zip_file.h"
using namespace mrt;
//mrt::ZipDirectory xxx;
struct LocalFileHeader {
unsigned version;
unsigned flags;
unsigned method;
unsigned mtime, mdate;
unsigned crc32;
unsigned csize, usize;
std::string fname;
mrt::Chunk extra;
size_t data_offset;
private:
unsigned fsize, esize;
protected:
void read0(const mrt::BaseFile &file) {
file.readLE16(version);
file.readLE16(flags);
file.readLE16(method);
file.readLE16(mtime);
file.readLE16(mdate);
file.readLE32(crc32);
file.readLE32(csize);
file.readLE32(usize);
//LOG_DEBUG(("version: %d, flags: %04x, compression: %d, crc32: %08x, size: %u/%u", version, flags, compression, crc32, csize, usize));
file.readLE16(fsize);
file.readLE16(esize);
}
void readFE(const mrt::BaseFile &file) {
if (fsize > 0) {
extra.set_size(fsize);
if (file.read(extra.get_ptr(), fsize) != fsize)
throw_ex(("unexpected end of archive"));
fname.assign((const char *)extra.get_ptr(), fsize);
} else {
fname.clear();
}
if (esize > 0) {
extra.set_size(esize);
if (file.read(extra.get_ptr(), esize) != esize)
throw_ex(("unexpected end of archive"));
} else {
extra.free();
}
data_offset = file.tell();
//LOG_DEBUG(("file: \"%s\", extra data: %s, data offset: %u", fname.c_str(), extra.dump().c_str(), (unsigned)data_offset));
}
public:
void read(const mrt::BaseFile &file) {
read0(file);
readFE(file);
file.seek(csize, SEEK_CUR);
}
};
struct CentralDirectorySignature : public LocalFileHeader {
mrt::Chunk comment;
unsigned disk_number;
unsigned internal_attrs, external_attrs;
int header_offset;
private:
unsigned comment_size;
public:
void read(const mrt::BaseFile &file) {
unsigned version_made;
file.readLE16(version_made);
//LOG_DEBUG(("central directory signature, made by version %d", version_made));
read0(file);
file.readLE16(comment_size);
file.readLE16(disk_number);
file.readLE16(internal_attrs);
file.readLE32(external_attrs);
file.readLE32(header_offset);
readFE(file);
if (comment_size > 0) {
comment.set_size(comment_size);
if (file.read(comment.get_ptr(), comment_size) != comment_size)
throw_ex(("unexpected end of the archive"));
} else {
comment.free();
}
//LOG_DEBUG(("comment: %s, header offset: %d", comment.dump().c_str(), header_offset));
}
};
struct EndOfCentralDirectorySignature {
unsigned disk_number, central_disk_number, central_on_this_disk;
unsigned entries;
unsigned size;
int central_offset;
mrt::Chunk comment;
private:
unsigned comment_size;
public:
void read(const mrt::BaseFile &file) {
file.readLE16(disk_number);
file.readLE16(central_disk_number);
file.readLE16(central_on_this_disk);
file.readLE16(entries);
file.readLE32(size);
file.readLE32(central_offset);
file.readLE16(comment_size);
if (comment_size > 0) {
comment.set_size(comment_size);
if (file.read(comment.get_ptr(), comment_size) != comment_size)
throw_ex(("unexpected end of the archive"));
} else comment.free();
}
};
ZipDirectory::ZipDirectory(const std::string &zip) : fname(zip) {
LOG_DEBUG(("opening archive: %s", zip.c_str()));
archive.open(zip, "rb");
unsigned magic;
while(!archive.eof()) {
try {
archive.readLE32(magic);
} catch(...) {
break;
}
if (magic == 0x04034b50) {
LocalFileHeader lfh;
lfh.read(archive);
FileDesc &file = headers[lfh.fname];
file.flags = lfh.flags;
file.method = lfh.method;
file.csize = lfh.csize;
file.usize = lfh.usize;
file.offset = lfh.data_offset;
} else if (magic == 0x02014b50) {
CentralDirectorySignature cds;
cds.read(archive);
} else if (magic == 0x06054b50) {
EndOfCentralDirectorySignature ecds;
ecds.read(archive);
} else {
LOG_WARN(("unknown magic: %08x", magic));
break;
}
}
LOG_DEBUG(("loaded %u files.", (unsigned)headers.size()));
}
void ZipDirectory::open(const std::string &path_) {
}
bool ZipDirectory::opened() const {
return false;
}
const std::string ZipDirectory::read() const {
return std::string();
}
void ZipDirectory::close() {}
void ZipDirectory::create(const std::string &path, const bool recurse) {}
ZipDirectory::~ZipDirectory() {
archive.close();
}
ZipFile * ZipDirectory::open_file(const std::string &name_) const {
std::string name = mrt::FSNode::normalize(name_);
Headers::const_iterator i = headers.find(name);
if (i == headers.end())
return NULL;
const FileDesc &file = i->second;
FILE * f = fopen(fname.c_str(), "rb");
if (f == NULL)
throw_io(("fopen(%s)", fname.c_str()));
return new ZipFile(f, file.method, file.flags, file.offset, file.csize, file.usize);
}
bool mrt::ZipDirectory::lessnocase::operator()(const std::string& s1, const std::string& s2) const {
#ifdef _WINDOWS
return _stricmp(s1.c_str(), s2.c_str()) < 0;
#else
return strcasecmp(s1.c_str(), s2.c_str()) < 0;
#endif
}
bool ZipDirectory::exists(const std::string &fname_) const {
std::string fname = mrt::FSNode::normalize(fname_);
return headers.find(fname) != headers.end();
}
void ZipDirectory::enumerate(std::vector<std::string>&files, const std::string &root) const {
if (root.empty()) {
for(Headers::const_iterator i = headers.begin(); i != headers.end(); ++i) {
files.push_back(i->first);
}
} else {
for(Headers::const_iterator i = headers.begin(); i != headers.end(); ++i) {
const std::string &fname = i->first;
if (fname.compare(0, root.size(), root))
continue;
std::string file = fname.substr(root.size() + 1);
if (!file.empty())
files.push_back(file);
}
}
}
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