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#include "zip_file.h"
#include "ioexception.h"
#include "logger.h"
#include <errno.h>
using namespace mrt;
ZipFile::ZipFile(FILE *file, const unsigned method, const unsigned flags, const unsigned offset, const unsigned csize, const unsigned usize) :
file(file), method(method), flags(flags), offset(offset), csize(csize), usize(usize), voffset(0) {
if (method != 0)
throw_ex(("compression method %u unsupported", method));
//LOG_DEBUG(("file created with usize: %ld", this->usize));
if (fseek(file, offset, SEEK_SET) == -1)
throw_io(("fseek(%u, SEEK_SET)", offset));
}
void ZipFile::open(const std::string &fname, const std::string &mode) {
throw_ex(("unimplemented!"));
}
bool ZipFile::opened() const {
return file != NULL;
}
void ZipFile::seek(long off, int whence) const {
switch(whence) {
case SEEK_SET: {
if (off < 0 || off > usize)
throw_ex(("seek(%ld, SEEK_SET) jumps out of file (%ld)", off, usize));
long r = fseek(file, offset + off, whence);
if (r == -1)
throw_io(("fseek"));
break;
}
case SEEK_CUR: {
if (off + voffset < 0 || off + voffset >= usize)
throw_ex(("seek(%ld, SEEK_CUR) jumps out of file (%ld inside %ld)", off, voffset, usize));
long r = fseek(file, off, whence);
if (r == -1)
throw_io(("fseek"));
break;
}
case SEEK_END: {
if (off + usize < 0 || off > 0)
throw_ex(("seek(%ld, SEEK_END) jumps out of file (size: %ld)", off, usize));
if (fseek(file, off + usize + offset, SEEK_SET) == -1)
throw_io(("fseek"));
break;
}
default:
throw_ex(("seek: unknown whence value (%d)", whence));
}
voffset = ftell(file) - offset;
if (voffset < 0 || voffset > usize)
throw_ex(("invalid voffset(%ld) after seek operation", voffset));
}
long ZipFile::tell() const {
return voffset;
}
void ZipFile::write(const mrt::Chunk &ch) const {
throw_ex(("unimplemented!"));
}
const off_t ZipFile::get_size() const {
return usize;
}
const size_t ZipFile::read(void *buf, const size_t size) const {
size_t rsize = ((long)size > usize - voffset)? usize - voffset: size;
//LOG_DEBUG(("read(%u), offset: %u + %ld, rsize: %u, usize: %u", (unsigned) size, offset, voffset, (unsigned)rsize, (unsigned)usize));
size_t r = fread(buf, 1, rsize, file);
if (r == (size_t)-1)
throw_io(("read(%p, %u)", buf, (unsigned)size));
//LOG_DEBUG(("result = %lu", (unsigned long) r));
voffset = ftell(file) - offset;
if (voffset < 0 || voffset > usize)
throw_ex(("invalid voffset(%ld) after seek operation", voffset));
return r;
}
void ZipFile::close() {
if (file == NULL)
return;
fclose(file);
file = NULL;
}
bool ZipFile::eof() const {
return voffset < usize;
}
ZipFile::~ZipFile() {
close();
}
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