unpack_lod_vfs.cpp

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// lod file format unpacker; it unpacks to the current directory!
// H3R_MM rule: when the engine is built -DH3R_MM, so does this
//c clang++ -std=c++11 -I. -Iasync -Ios -Ios/posix -Iutils -Istream -Igame -DH3R_MM -O0 -g -DH3R_DEBUG -fsanitize=address,undefined,integer,leak -fvisibility=hidden -fno-exceptions -fno-threadsafe-statics unpack_lod_vfs.cpp -o unpack_lod_vfs main.a -lz

#include <time.h>

#include "h3r_os_error.h"
H3R_ERR_DEFINE_UNHANDLED
H3R_ERR_DEFINE_HANDLER(Memory,H3R_ERR_HANDLER_UNHANDLED)

#include "h3r_log.h"
H3R_LOG_STATIC_INIT

#include "h3r_filestream.h"
#include "h3r_thread.h"
#include "h3r_lodfs.h"
#include "h3r_taskthread.h"
#include "h3r_taskstate.h"
#include "h3r_iasynctask.h"
#include "h3r_vfs.h"
#include "h3r_criticalsection.h"

// allow file replacement
H3R_NAMESPACE
namespace OS { class FileErrReplace final : public Error
{
    public: bool Handled(Error * e = nullptr) override
    {
        FileError * fe = static_cast<FileError *>(e);
        if (FileError::Op::Replace == fe->Op)
            return fe->Replace = true;
        return false;
    }
}; }
NAMESPACE_H3R
static H3R_NS::OS::FileErrReplace my_file_err;
H3R_ERR_DEFINE_HANDLER(File, my_file_err)

static int const QN {10};
static const char * const Q[QN] =
{
    "\"Countless words count less than the silent balance between yin and yang\"",
    "\"Nature does not hurry, yet everything is accomplished.\"",
    "\"He strains to hear a whisper who refuses to hear a shout.\"",
    "\"Dance with her, and she will forgive much; dance well, and she will forgive anything.\"",
    "\"Surprising what you can dig out of books if you read long enough, isn't it?\"",
    "\"Destiny has two ways of crushing us - by refusing our wishes and by fulfilling them.\"",
    "\"Cahn's Axiom: When all else fails, read the instructions.\"",
    "\"People get what they get. It has nothing to do with what they deserve.\"",
    "Unwise one: The sky is the limit? I hate limits."
};

static H3R_NS::OS::CriticalSection _task_info_gate {};

class MyWalkTask final : public H3R_NS::IAsyncTask
{
    public: H3R_NS::LodFS * _lodfs;
    public: MyWalkTask(H3R_NS::LodFS * fs) : _lodfs{fs} {}
    public: static H3R_NS::TaskState * State;
    public: inline void Do() override
    {
        _lodfs->Walk (
            [](H3R_NS::Stream & stream, const H3R_NS::VFS::Entry & e) -> bool
            {
                static int count {};
                {
                __pointless_verbosity::CriticalSection_Acquire_finally_release
                    ____ {_task_info_gate};
                    *State = H3R_NS::TaskState {count++,
                        H3R_NS::String::Format ("Enumerating ... %s",
                            e.Name.AsZStr ())};
                    State->SetChanged (true);
                }
                H3R_NS::OS::FileStream {
                    e.Name, H3R_NS::OS::FileStream::Mode::WriteOnly}
                    .H3R_NS::Stream::Write (stream);
                return true;
            });
    }
    public: H3R_NS::TaskState Whatsup() override
    {
        __pointless_verbosity::CriticalSection_Acquire_finally_release
            ____ {_task_info_gate};
        return *State;
    }
};
H3R_NS::TaskState * MyWalkTask::State {};

int main(int c, char ** v)
{
    if (2 != c)
        return printf ("usage: unpack_lod lodfile\n");

    printf ("main: %s " EOL, Q[time (nullptr) % QN]);

    H3R_NS::TaskThread MyThread {};
    H3R_NS::LodFS lodfs {v[1]};
    MyWalkTask task {&lodfs};
    H3R_NS::TaskState task_state {0, ""};
    MyWalkTask::State = &task_state;
    MyThread.Task = task;

    while (! MyThread.Done ()) {
        auto info = task.Whatsup ();
        if (info.Changed ())
            printf ("main: [%4d] %-32s\r",
                info.Progress (), info.Message ().AsZStr ());
        // TODO VFS[n/m] complete
        // printf ("main: %003d %% complete\r", info.Progress ());
        // printf ("main: %s\r", _on_lod_entry.Message ().AsZStr ());
        H3R_NS::OS::Thread::Sleep (5);

        static time_t t0 = time (nullptr);
        time_t hms = time (nullptr) / 60;
        if (hms-t0 > 2)
            t0 = hms,
            printf ("main: %s " EOL, Q[hms % QN]);
    }
    // Yes you can miss a status message from the thread because they aren't
    // queued; e.g. the UI shall take care of "completed"
    printf (EOL "main: [%4d] 100 %% complete" EOL,
        task.Whatsup ().Progress ());

    // No threads: short and simple.
    /*H3R_NS::LodFS {v[1]}
        .Walk([](H3R_NS::Stream & stream, const H3R_NS::VFS::Entry & e) -> bool
        {
            H3R_NS::OS::FileStream {
                e.Name, H3R_NS::OS::FileStream::Mode::WriteOnly}
                .H3R_NS::Stream::Write (stream);
            return true;
        });*/

    return 0;
}