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module bio.core.utils.stream;
public import contrib.undead.stream;
import core.stdc.stdio;
import core.stdc.errno;
import core.stdc.string;
import core.sys.posix.sys.select;
import std.conv;
import std.string : toStringz;
version(Posix){
private import core.sys.posix.unistd;
}
version(Windows) {
private import std.file;
private import std.utf;
private import core.stdc.windows.windows;
extern (Windows) {
DWORD GetFileType(HANDLE hFile);
}
}
FileMode toFileMode(string mode) {
FileMode result = FileMode.In;
switch (mode) {
case "r", "rb":
result = FileMode.In; // 1000
break;
case "r+", "r+b", "rb+":
result = FileMode.In | FileMode.Out; // 1100
case "w", "wb":
result = FileMode.OutNew; // 0110
break;
case "w+", "w+b", "wb+":
result = FileMode.In | FileMode.OutNew; // 1110
break;
case "a", "ab":
result = FileMode.Append; // 0001
break;
case "a+", "a+b", "ab+":
result = FileMode.In | FileMode.Append; // 1001
break;
default:
break;
}
return result;
}
final class File: contrib.undead.stream.File {
this(string filename, string mode="rb") {
version (Posix) {
// Issue 8528 workaround
auto file = fopen(toStringz(filename), toStringz(mode));
if (file == null) {
throw new OpenException(cast(string) ("Cannot open or create file '"
~ filename ~ "' : ") ~
to!string(strerror(errno)));
}
super(core.stdc.stdio.fileno(file), toFileMode(mode));
}
version (Windows) {
int access, share, createMode;
auto mode_flags = toFileMode(mode);
share |= FILE_SHARE_READ | FILE_SHARE_WRITE;
if (mode_flags & FileMode.In) {
access |= GENERIC_READ;
createMode = OPEN_EXISTING;
}
if (mode_flags & FileMode.Out) {
access |= GENERIC_WRITE;
createMode = OPEN_ALWAYS;
}
if ((mode_flags & FileMode.OutNew) == FileMode.OutNew) {
createMode = CREATE_ALWAYS;
}
auto handle = CreateFileW(std.utf.toUTF16z(filename), access, share,
null, createMode, 0, null);
isopen = handle != INVALID_HANDLE_VALUE;
if (!isopen) {
throw new OpenException(cast(string) ("Cannot open or create file '"
~ filename ~ "'"));
}
super(handle, toFileMode(mode));
}
}
override ulong seek(long offset, SeekPos rel) {
assertSeekable();
auto hFile = handle();
version (Windows) {
int hi = cast(int)(offset>>32);
uint low = SetFilePointer(hFile, cast(int)offset, &hi, rel);
if ((low == INVALID_SET_FILE_POINTER) && (GetLastError() != 0))
throw new SeekException("unable to move file pointer");
ulong result = (cast(ulong)hi << 32) + low;
} else version (Posix) {
// Phobos casts offset to int, leading to throwing an exception
// on large files
auto result = lseek(hFile, cast(off_t)offset, rel);
if (result == cast(typeof(result))-1)
throw new SeekException("unable to move file pointer");
}
readEOF = false;
return cast(ulong)result;
}
override size_t readBlock(void* buffer, size_t size) {
assertReadable();
auto hFile = handle();
version (Windows) {
auto dwSize = to!DWORD(size);
ReadFile(hFile, buffer, dwSize, &dwSize, null);
size = dwSize;
} else version (Posix) {
// http://developerweb.net/viewtopic.php?id=4267
fd_set rset;
timeval timeout;
immutable MAX_IDLE_SECS = 1;
while (true) {
auto ret = core.sys.posix.unistd.read(hFile, buffer, size);
if (ret == -1) {
if (errno == EINTR)
continue;
if (errno == EAGAIN || errno == EWOULDBLOCK) {
FD_ZERO(&rset);
FD_SET(hFile, &rset);
timeout.tv_sec = MAX_IDLE_SECS;
timeout.tv_usec = 0;
ret = select(hFile + 1, &rset, null, null, &timeout);
if (ret <= 0) {
size = 0;
throw new ReadException("read timeout");
}
} else {
throw new ReadException(to!string(strerror(errno)));
}
} else {
size = ret;
break;
}
}
}
readEOF = (size == 0);
return size;
}
override size_t writeBlock(const void* buffer, size_t size) {
assertWriteable();
auto hFile = handle();
version (Windows) {
auto dwSize = to!DWORD(size);
WriteFile(hFile, buffer, dwSize, &dwSize, null);
size = dwSize;
} else version (Posix) {
size = core.sys.posix.unistd.write(hFile, buffer, size);
if (size == -1)
throw new WriteException(to!string(strerror(errno)));
}
return size;
}
}
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