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FileInputStream.c
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1996-09-28
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/*
* java.io.FileInputStream.c
*
* Copyright (c) 1996 Systems Architecture Research Centre,
* City University, London, UK.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* Written by Tim Wilkinson <tim@sarc.city.ac.uk>, February 1996.
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <assert.h>
#if defined(HAVE_IO_H)
#include <io.h>
#endif
#include "defs.h"
#include "files.h"
#include "java.io.stubs/FileInputStream.h"
#include "java.io.stubs/FileDescriptor.h"
#include "kthread.h"
/*
* Open a file for input.
*/
void
java_io_FileInputStream_open(struct Hjava_io_FileInputStream* this, struct Hjava_lang_String* name)
{
char str[MAXPATHLEN];
int fd;
javaString2CString(name, str, sizeof(str));
fd = threadedOpen(str, O_RDONLY|O_BINARY, 0);
unhand(unhand(this)->fd)->fd = fd;
if (fd < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
}
/*
* Close file.
*/
void
java_io_FileInputStream_close(struct Hjava_io_FileInputStream* this)
{
int r;
if (unhand(unhand(this)->fd)->fd >= 0) {
r = close(unhand(unhand(this)->fd)->fd);
unhand(unhand(this)->fd)->fd = -1;
if (r < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
}
}
/*
* Read in bytes.
*/
jint
java_io_FileInputStream_readBytes(struct Hjava_io_FileInputStream* fh, HArrayOfByte* bytes, jint off, jint len)
{
jint ret;
ret = threadedRead(unhand(unhand(fh)->fd)->fd, &unhand(bytes)->body[off], len);
if (ret < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
return (ret > 0 ? ret : -1);
}
/*
* Read a single byte.
*/
jint
java_io_FileInputStream_read(struct Hjava_io_FileInputStream* fh)
{
jint ret;
unsigned char byte;
ret = threadedRead(unhand(unhand(fh)->fd)->fd, &byte, 1);
if (ret < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
return (ret > 0 ? byte : -1);
}
/*
* Skip forward in stream.
*/
jlong
java_io_FileInputStream_skip(struct Hjava_io_FileInputStream* fh, jlong off)
{
off_t ret;
ret = lseek(unhand(unhand(fh)->fd)->fd, jlong2off_t(off), 1);
if (ret < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
return (off_t2jlong(ret));
}
/*
* Return the number of bytes available to read without blocking.
*/
jint
java_io_FileInputStream_available(struct Hjava_io_FileInputStream* fh)
{
int fd;
struct stat buf;
int ret;
off_t sret;
fd = unhand(unhand(fh)->fd)->fd;
ret = fstat(fd, &buf);
sret = lseek(fd, 0, 1);
if (ret < 0 || sret < 0) {
SignalError(0, "java.io.IOException", SYS_ERROR);
}
return (buf.st_size - sret);
}