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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001, 2004, 2007 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <mailutils/stream.h>
#include <mailutils/errno.h>
#undef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#define MU_STREAM_MEMORY_BLOCKSIZE 128
struct _memory_stream
{
char *filename;
char *ptr;
size_t size;
size_t capacity;
};
static void
_memory_destroy (mu_stream_t stream)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
if (mfs && mfs->ptr != NULL)
free (mfs->ptr);
if(mfs->filename)
free (mfs->filename);
free (mfs);
}
static int
_memory_read (mu_stream_t stream, char *optr, size_t osize,
mu_off_t offset, size_t *nbytes)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
size_t n = 0;
if (mfs->ptr != NULL && ((size_t)offset <= mfs->size))
{
n = ((offset + osize) > mfs->size) ? mfs->size - offset : osize;
memcpy (optr, mfs->ptr + offset, n);
}
if (nbytes)
*nbytes = n;
return 0;
}
static int
_memory_readline (mu_stream_t stream, char *optr, size_t osize,
mu_off_t offset, size_t *nbytes)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
char *nl;
size_t n = 0;
if (mfs->ptr && ((size_t)offset < mfs->size))
{
/* Save space for the null byte. */
osize--;
nl = memchr (mfs->ptr + offset, '\n', mfs->size - offset);
n = (nl) ? (size_t)(nl - (mfs->ptr + offset) + 1) : mfs->size - offset;
n = min (n, osize);
memcpy (optr, mfs->ptr + offset, n);
optr[n] = '\0';
}
if (nbytes)
*nbytes = n;
return 0;
}
static int
_memory_write (mu_stream_t stream, const char *iptr, size_t isize,
mu_off_t offset, size_t *nbytes)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
/* Bigger we have to realloc. */
if (mfs->capacity < ((size_t)offset + isize))
{
/* Realloc by fixed blocks of 128. */
size_t newsize = MU_STREAM_MEMORY_BLOCKSIZE *
(((offset + isize)/MU_STREAM_MEMORY_BLOCKSIZE) + 1);
char *tmp = realloc (mfs->ptr, newsize);
if (tmp == NULL)
return ENOMEM;
mfs->ptr = tmp;
mfs->capacity = newsize;
}
mfs->size = offset + isize;
memcpy (mfs->ptr + offset, iptr, isize);
if (nbytes)
*nbytes = isize;
return 0;
}
static int
_memory_truncate (mu_stream_t stream, mu_off_t len)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
if (len == 0)
{
if (mfs->ptr)
free (mfs->ptr);
mfs->ptr = NULL;
}
else if (len != (mu_off_t)mfs->size)
{
char *tmp = realloc (mfs->ptr, len);
if (tmp == NULL)
return ENOMEM;
mfs->ptr = tmp;
}
mfs->size = len;
mfs->capacity = len;
return 0;
}
static int
_memory_size (mu_stream_t stream, mu_off_t *psize)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
if (psize)
*psize = mfs->size;
return 0;
}
static int
_memory_close (mu_stream_t stream)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
if (mfs->ptr)
free (mfs->ptr);
mfs->ptr = NULL;
mfs->size = 0;
mfs->capacity = 0;
return 0;
}
static int
_memory_open (mu_stream_t stream)
{
struct _memory_stream *mfs = mu_stream_get_owner (stream);
int status = 0;
/* Close any previous file. */
if (mfs->ptr)
free (mfs->ptr);
mfs->ptr = NULL;
mfs->size = 0;
mfs->capacity = 0;
/* Initialize the data with file contents, if a filename was provided. */
if (mfs->filename)
{
struct stat statbuf;
if (stat (mfs->filename, &statbuf) == 0)
{
mfs->ptr = calloc (statbuf.st_size, 1);
if (mfs->ptr)
{
FILE *fp;
mfs->capacity = statbuf.st_size;
mfs->size = statbuf.st_size;
fp = fopen (mfs->filename, "r");
if (fp)
{
size_t r = fread (mfs->ptr, mfs->size, 1, fp);
if (r != mfs->size)
status = EIO;
fclose (fp);
}
else
status = errno;
if (status != 0)
{
free (mfs->ptr);
mfs->ptr = NULL;
mfs->capacity = 0;
mfs->size = 0;
}
}
else
status = ENOMEM;
}
else
status = EIO;
}
return status;
}
int
mu_memory_stream_create (mu_stream_t * stream, const char *filename, int flags)
{
struct _memory_stream *mfs;
int ret;
if (stream == NULL)
return MU_ERR_OUT_PTR_NULL;
mfs = calloc (1, sizeof (*mfs));
if (mfs == NULL)
return ENOMEM;
if (filename)
{
mfs->filename = strdup (filename);
if (!mfs->filename)
{
free (mfs);
return ENOMEM;
}
}
mfs->ptr = NULL;
mfs->size = 0;
ret = mu_stream_create (stream, flags | MU_STREAM_NO_CHECK, mfs);
if (ret != 0)
{
free (mfs->filename);
free (mfs);
return ret;
}
mu_stream_set_open (*stream, _memory_open, mfs);
mu_stream_set_close (*stream, _memory_close, mfs);
mu_stream_set_read (*stream, _memory_read, mfs);
mu_stream_set_readline (*stream, _memory_readline, mfs);
mu_stream_set_write (*stream, _memory_write, mfs);
mu_stream_set_truncate (*stream, _memory_truncate, mfs);
mu_stream_set_size (*stream, _memory_size, mfs);
mu_stream_set_destroy (*stream, _memory_destroy, mfs);
return 0;
}
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