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#include "compressor.h"
#include <zlib.h>
#include "convert.h"
#include "exceptions.h"
ResourceCompressor::ResourceCompressor()
{
priority = 1000;
}
ResourceCompressor::~ResourceCompressor()
{
}
void ResourceCompressor::adjustBuffers(int fileSize)
{
int maxComprSize = (int)((fileSize + 100.0) * 2.1);
if (maxComprSize < 1024)
maxComprSize = 1024;
unpackedBuffer.setSize(fileSize);
packedBuffer.setSize(maxComprSize);
}
static int writeInt(std::ostream *stream, int v)
{
unsigned char b[4];
int i, ib;
for (i = 0; i < 4; i++) {
ib = v & 0xFF;
v = v >> 8;
b[i] = ib;
}
stream->write((char*)&b, 4);
return 4;
}
static int writeString(std::ostream *stream, const std::wstring &value)
{
std::string v(toUtf8(value));
int len = v.length() + 1;
stream->write(v.c_str(), len);
return len;
}
int ResourceCompressor::writeHeader()
{
int offset = writeString(stream, L"CRF");
offset += writeInt(stream, 2);
offset += writeInt(stream, 1);
offset += writeInt(stream, priority);
return offset;
}
void ResourceCompressor::showEntryStat(Entry &entry)
{
std::cerr << entry.name << " before: " << entry.realSize <<
", after: " << entry.packedSize << ", ratio: " <<
(100.0 / entry.realSize) * entry.packedSize << "%" << std::endl;
}
void ResourceCompressor::openStream(const std::string &outputFile)
{
if ((outputFile.length()) && (outputFile != "-")) {
dontDeleteStream = false;
std::ofstream *s = new std::ofstream();
stream = s;
s->open(outputFile.c_str(), std::ios::out | std::ios::binary);
if (stream->fail()) {
delete stream;
throw std::string("Can't open output file");
}
} else {
dontDeleteStream = true;
stream = &std::cout;
}
}
void ResourceCompressor::closeStream()
{
if (! dontDeleteStream)
delete stream;
}
void ResourceCompressor::compress(const std::string &outputFile, bool verbose)
{
openStream(outputFile);
int offset = writeHeader();
for (Entries::iterator i = entries.begin(); i != entries.end(); i++) {
Entry &e = *i;
compressEntry(e, offset);
if (verbose)
showEntryStat(e);
}
writeFooter(offset);
closeStream();
}
void ResourceCompressor::printDeps(const std::string &outputFile,
const std::string &sourceFile)
{
std::cout << std::endl << outputFile << ": " << sourceFile << " ";
int width = outputFile.length() + sourceFile.length() + 3;
for (Entries::iterator i = entries.begin(); i != entries.end(); i++) {
Entry &e = *i;
std::cout << " ";
int len = e.fileName.length() + 1;
if (len + width > 77) {
std::cout << "\\" << std::endl << "\t";
width = 7;
}
std::cout << e.fileName;
width += len;
}
std::cout << std::endl;
}
void ResourceCompressor::writeFooter(int &offset)
{
int start = offset;
for (Entries::iterator i = entries.begin(); i != entries.end(); i++) {
Entry &e = *i;
offset += writeString(stream, e.name);
offset += writeInt(stream, e.realSize);
offset += writeInt(stream, e.offset);
offset += writeInt(stream, e.packedSize);
offset += writeInt(stream, e.comprLevel);
offset += writeString(stream, e.group);
}
offset += writeInt(stream, start);
offset += writeInt(stream, entries.size());
}
static int pack(char *in, int inSize, char *out, int maxOutSize, int level)
{
if (! level) {
if (inSize)
memcpy(out, in, inSize);
return inSize;
} else {
z_stream zs;
memset(&zs, 0, sizeof(z_stream));
zs.next_in = (Bytef*)in;
zs.avail_in = inSize;
zs.next_out = (Bytef*)out;
zs.avail_out = maxOutSize;
if (deflateInit(&zs, level) != Z_OK)
throw std::string("Can't init compressor");
if (deflate(&zs, Z_FINISH) != Z_STREAM_END)
throw std::string("Error compressing data");
if (deflateEnd(&zs) != Z_OK)
throw std::string("Error finishing compressor");
return zs.total_out;
}
}
void ResourceCompressor::readData(const std::wstring &fileName)
{
std::ifstream ifs(toMbcs(fileName).c_str(),
std::ios::in | std::ios::binary);
if (ifs.fail())
throw Exception(L"Error opening file '" + fileName + L"'");
ifs.seekg(0, std::ios::end);
int realSize = ifs.tellg();
unpackedBuffer.setSize(realSize);
ifs.seekg(0, std::ios::beg);
if (realSize <= 0)
throw Exception(L"File '" + fileName + L"' has invalid size");
ifs.read((char*)unpackedBuffer.getData(), realSize);
if (ifs.fail() || (ifs.gcount() != realSize))
throw Exception(L"Error reading from file '" + fileName + L"'");
ifs.close();
}
void ResourceCompressor::runFormatter(Formatter *formatter,
const std::wstring &fileName)
{
unpackedBuffer.setSize(0);
unpackedBuffer.gotoPos(0);
formatter->format(fileName, unpackedBuffer);
}
void ResourceCompressor::compressEntry(Entry &entry, int &offset)
{
entry.offset = offset;
if (! entry.formatter)
readData(entry.fileName);
else
runFormatter(entry.formatter, entry.fileName);
entry.realSize = unpackedBuffer.getSize();
adjustBuffers(entry.realSize);
entry.packedSize = pack((char*)unpackedBuffer.getData(), entry.realSize,
(char*)packedBuffer.getData(), packedBuffer.getSize(),
entry.comprLevel);
stream->write((char*)packedBuffer.getData(), entry.packedSize);
offset += entry.packedSize;
}
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