Added file I/O and file access API

git-svn-id: http://svn.pjsip.org/repos/pjproject/main@18 74dad513-b988-da41-8d7b-12977e46ad98

1 files changed, 186 insertions, 0 deletions

diff --git a/pjlib/src/pj/file_io_win32.c b/pjlib/src/pj/file_io_win32.c
new file mode 100644
index 00000000..d9908410
--- /dev/null
+++ b/pjlib/src/pj/file_io_win32.c
@@ -0,0 +1,186 @@
+/* $Id$ */
+#include <pj/file_io.h>
+#include <pj/errno.h>
+#include <pj/assert.h>
+
+#include <windows.h>
+
+#ifndef INVALID_SET_FILE_POINTER
+#   define INVALID_SET_FILE_POINTER     ((DWORD)-1)
+#endif
+

+/**

+ * Check for end-of-file condition on the specified descriptor.

+ *

+ * @param fd            The file descriptor.

+ * @param access        The desired access.

+ *

+ * @return              Non-zero if file is EOF.

+ */

+PJ_DECL(pj_bool_t) pj_file_eof(pj_oshandle_t fd, 

+                               enum pj_file_access access);

+
+
+PJ_DEF(pj_status_t) pj_file_open( pj_pool_t *pool,
+                                  const char *pathname, 
+                                  unsigned flags,
+                                  pj_oshandle_t *fd)
+{
+    HANDLE hFile;
+    DWORD dwDesiredAccess = 0;
+    DWORD dwShareMode = 0;
+    DWORD dwCreationDisposition = 0;
+    DWORD dwFlagsAndAttributes = 0;
+
+    PJ_UNUSED_ARG(pool);
+
+    PJ_ASSERT_RETURN(pathname!=NULL, PJ_EINVAL);
+
+    if ((flags & PJ_O_WRONLY) == PJ_O_WRONLY) {
+        dwDesiredAccess |= GENERIC_WRITE;
+        if ((flags & PJ_O_APPEND) == PJ_O_APPEND) {
+            dwDesiredAccess |= FILE_APPEND_DATA;
+        } else {
+            dwDesiredAccess &= ~(FILE_APPEND_DATA);

+            dwCreationDisposition |= CREATE_ALWAYS;

+        }
+    }
+    if ((flags & PJ_O_RDONLY) == PJ_O_RDONLY) {

+        dwDesiredAccess |= GENERIC_READ;

+        if (flags == PJ_O_RDONLY)

+            dwCreationDisposition |= OPEN_EXISTING;

+    }

+
+    if (dwDesiredAccess == 0) {
+        pj_assert(!"Invalid file open flags");
+        return PJ_EINVAL;
+    }
+
+    dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
+    dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
+

+    hFile = CreateFile(pathname, dwDesiredAccess, dwShareMode, NULL,
+                       dwCreationDisposition, dwFlagsAndAttributes, NULL);
+    if (hFile == INVALID_HANDLE_VALUE) {
+        *fd = 0;
+        return PJ_RETURN_OS_ERROR(GetLastError());
+    }
+
+    *fd = hFile;
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_file_close(pj_oshandle_t fd)
+{
+    if (CloseHandle(fd)==0)
+        return PJ_RETURN_OS_ERROR(GetLastError());
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_file_write( pj_oshandle_t fd,
+                                   const void *data,
+                                   pj_ssize_t *size)
+{
+    BOOL rc;
+    DWORD bytesWritten;
+
+    rc = WriteFile(fd, data, *size, &bytesWritten, NULL);
+    if (!rc) {
+        *size = -1;
+        return PJ_RETURN_OS_ERROR(GetLastError());
+    }
+
+    *size = bytesWritten;
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_file_read( pj_oshandle_t fd,
+                                  void *data,
+                                  pj_ssize_t *size)
+{
+    BOOL rc;
+    DWORD bytesRead;
+
+    rc = ReadFile(fd, data, *size, &bytesRead, NULL);
+    if (!rc) {
+        *size = -1;
+        return PJ_RETURN_OS_ERROR(GetLastError());
+    }
+
+    *size = bytesRead;
+    return PJ_SUCCESS;
+}
+

+/*

+PJ_DEF(pj_bool_t) pj_file_eof(pj_oshandle_t fd, enum pj_file_access access)

+{

+    BOOL rc;

+    DWORD dummy = 0, bytes;

+    DWORD dwStatus;

+

+    if ((access & PJ_O_RDONLY) == PJ_O_RDONLY) {

+        rc = ReadFile(fd, &dummy, 0, &bytes, NULL);

+    } else if ((access & PJ_O_WRONLY) == PJ_O_WRONLY) {

+        rc = WriteFile(fd, &dummy, 0, &bytes, NULL);

+    } else {

+        pj_assert(!"Invalid access");

+        return PJ_TRUE;

+    }

+

+    dwStatus = GetLastError();

+    if (dwStatus==ERROR_HANDLE_EOF)

+        return PJ_TRUE;

+

+    return 0;

+}

+*/

+
+PJ_DEF(pj_status_t) pj_file_setpos( pj_oshandle_t fd,
+                                    pj_off_t offset,
+                                    enum pj_file_seek_type whence)
+{
+    DWORD dwMoveMethod;
+    DWORD dwNewPos;
+    LONG  hi32;
+
+    if (whence == PJ_SEEK_SET)
+        dwMoveMethod = FILE_BEGIN;
+    else if (whence == PJ_SEEK_CUR)
+        dwMoveMethod = FILE_CURRENT;
+    else if (whence == PJ_SEEK_END)
+        dwMoveMethod = FILE_END;
+    else {
+        pj_assert(!"Invalid whence in file_setpos");
+        return PJ_EINVAL;
+    }
+
+    hi32 = (LONG)(offset >> 32);
+    dwNewPos = SetFilePointer(fd, (long)offset, &hi32, dwMoveMethod);
+    if (dwNewPos == (DWORD)INVALID_SET_FILE_POINTER) {
+        DWORD dwStatus = GetLastError();
+        if (dwStatus != 0)
+            return PJ_RETURN_OS_ERROR(dwStatus);
+        /* dwNewPos actually is not an error. */
+    }
+
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_file_getpos( pj_oshandle_t fd,
+                                    pj_off_t *pos)
+{
+    LONG hi32 = 0;
+    DWORD lo32;
+
+    lo32 = SetFilePointer(fd, 0, &hi32, FILE_CURRENT);
+    if (lo32 == (DWORD)INVALID_SET_FILE_POINTER) {
+        DWORD dwStatus = GetLastError();
+        if (dwStatus != 0)
+            return PJ_RETURN_OS_ERROR(dwStatus);
+    }
+
+    *pos = hi32;
+    *pos = (*pos << 32) + lo32;
+    return PJ_SUCCESS;
+}
+