117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Manuel Serrano and Xavier Leroy, INRIA Rocquencourt */
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/* */
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/* Copyright 2000 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "bigarray.h"
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#include "alloc.h"
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#include "custom.h"
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#include "fail.h"
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#include "mlvalues.h"
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#include "sys.h"
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#include "unixsupport.h"
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extern int bigarray_element_size[]; /* from bigarray_stubs.c */
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static void bigarray_sys_error(void);
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CAMLprim value bigarray_map_file(value vfd, value vkind, value vlayout,
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value vshared, value vdim)
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{
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HANDLE fd, fmap;
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int flags, major_dim, mode, perm;
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long num_dims, i;
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long dim[MAX_NUM_DIMS];
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long currpos, file_size;
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unsigned long array_size;
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char c;
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void * addr;
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fd = Handle_val(vfd);
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flags = Int_val(vkind) | Int_val(vlayout);
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num_dims = Wosize_val(vdim);
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major_dim = flags & BIGARRAY_FORTRAN_LAYOUT ? num_dims - 1 : 0;
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/* Extract dimensions from Caml array */
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num_dims = Wosize_val(vdim);
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if (num_dims < 1 || num_dims > MAX_NUM_DIMS)
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invalid_argument("Bigarray.mmap: bad number of dimensions");
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for (i = 0; i < num_dims; i++) {
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dim[i] = Long_val(Field(vdim, i));
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if (dim[i] == -1 && i == major_dim) continue;
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if (dim[i] < 0 || dim[i] > 0x7FFFFFFFL)
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invalid_argument("Bigarray.create: negative dimension");
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}
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/* Determine file size */
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currpos = SetFilePointer(fd, 0, NULL, FILE_CURRENT);
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if (currpos == -1) bigarray_sys_error();
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file_size = SetFilePointer(fd, 0, NULL, FILE_END);
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if (file_size == -1) bigarray_sys_error();
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/* Determine array size in bytes (or size of array without the major
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dimension if that dimension wasn't specified) */
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array_size = bigarray_element_size[flags & BIGARRAY_KIND_MASK];
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for (i = 0; i < num_dims; i++)
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if (dim[i] != -1) array_size *= dim[i];
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/* Check if the first/last dimension is unknown */
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if (dim[major_dim] == -1) {
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/* Determine first/last dimension from file size */
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if ((unsigned long) file_size % array_size != 0)
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failwith("Bigarray.mmap: file size doesn't match array dimensions");
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dim[major_dim] = (unsigned long) file_size / array_size;
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array_size = file_size;
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}
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/* Restore original file position */
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SetFilePointer(fd, currpos, NULL, FILE_BEGIN);
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/* Create the file mapping */
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if (Bool_val(vshared)) {
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perm = PAGE_READWRITE;
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mode = FILE_MAP_WRITE;
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} else {
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perm = PAGE_READONLY; /* doesn't work under Win98 */
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mode = FILE_MAP_COPY;
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}
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fmap = CreateFileMapping(fd, NULL, perm, 0, array_size, NULL);
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if (fmap == NULL) bigarray_sys_error();
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/* Map the mapping in memory */
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addr = MapViewOfFile(fmap, mode, 0, 0, array_size);
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if (addr == NULL) bigarray_sys_error();
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/* Close the file mapping */
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CloseHandle(fmap);
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/* Build and return the Caml bigarray */
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return alloc_bigarray(flags | BIGARRAY_MAPPED_FILE, num_dims, addr, dim);
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}
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void bigarray_unmap_file(void * addr, unsigned long len)
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{
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UnmapViewOfFile(addr);
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}
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static void bigarray_sys_error(void)
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{
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char buffer[512];
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unsigned long errnum;
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errnum = GetLastError();
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if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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errnum,
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0,
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buffer,
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sizeof(buffer),
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NULL))
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sprintf(buffer, "Unknown error %ld\n", errnum);
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raise_sys_error(copy_string(buffer));
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}
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