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/* io.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include "apk_defines.h"
#include "apk_io.h"
struct apk_fd_istream {
struct apk_istream is;
int fd;
};
static size_t fd_read(void *stream, void *ptr, size_t size)
{
struct apk_fd_istream *fis =
container_of(stream, struct apk_fd_istream, is);
size_t i = 0, r;
if (ptr == NULL) {
if (lseek(fis->fd, size, SEEK_CUR) < 0)
return -1;
return size;
}
while (i < size) {
r = read(fis->fd, ptr + i, size - i);
if (r < 0)
return r;
if (r == 0)
return i;
i += r;
}
return i;
}
static size_t fd_splice(void *stream, int fd, size_t size)
{
struct apk_fd_istream *fis =
container_of(stream, struct apk_fd_istream, is);
size_t i = 0, r;
while (i != size) {
r = splice(fis->fd, NULL, fd, NULL, size - i, SPLICE_F_MOVE);
if (r == -1)
return i;
i += r;
}
return i;
}
static void fd_close(void *stream)
{
struct apk_fd_istream *fis =
container_of(stream, struct apk_fd_istream, is);
close(fis->fd);
free(fis);
}
struct apk_istream *apk_istream_from_fd(int fd)
{
struct apk_fd_istream *fis;
fis = malloc(sizeof(struct apk_fd_istream));
if (fis == NULL)
return NULL;
*fis = (struct apk_fd_istream) {
.is.read = fd_read,
.is.splice = fd_splice,
.is.close = fd_close,
.fd = fd,
};
return &fis->is;
}
struct apk_istream *apk_istream_from_file(const char *file)
{
int fd;
fd = open(file, O_RDONLY);
if (fd < 0)
return NULL;
return apk_istream_from_fd(fd);
}
size_t apk_istream_skip(struct apk_istream *is, size_t size)
{
unsigned char buf[2048];
size_t done = 0, r, togo;
while (done < size) {
togo = size - done;
if (togo > sizeof(buf))
togo = sizeof(buf);
r = is->read(is, buf, togo);
if (r < 0)
return r;
done += r;
if (r != togo)
break;
}
return done;
}
size_t apk_istream_splice(void *stream, int fd, size_t size)
{
struct apk_istream *is = (struct apk_istream *) stream;
unsigned char buf[2048];
size_t done = 0, r, togo;
while (done < size) {
togo = size - done;
if (togo > sizeof(buf))
togo = sizeof(buf);
r = is->read(is, buf, togo);
if (r < 0)
return r;
if (write(fd, buf, r) != r)
return -1;
done += r;
if (r != togo)
break;
}
return done;
}
struct apk_istream_bstream {
struct apk_bstream bs;
struct apk_istream *is;
csum_ctx_t csum_ctx;
unsigned char buffer[8*1024];
};
static size_t is_bs_read(void *stream, void **ptr)
{
struct apk_istream_bstream *isbs =
container_of(stream, struct apk_istream_bstream, bs);
size_t size;
size = isbs->is->read(isbs->is, isbs->buffer, sizeof(isbs->buffer));
if (size <= 0)
return size;
csum_process(&isbs->csum_ctx, isbs->buffer, size);
*ptr = isbs->buffer;
return size;
}
static void is_bs_close(void *stream, csum_t csum)
{
struct apk_istream_bstream *isbs =
container_of(stream, struct apk_istream_bstream, bs);
if (csum != NULL)
csum_finish(&isbs->csum_ctx, csum);
isbs->is->close(isbs->is);
free(isbs);
}
struct apk_bstream *apk_bstream_from_istream(struct apk_istream *istream)
{
struct apk_istream_bstream *isbs;
isbs = malloc(sizeof(struct apk_istream_bstream));
if (isbs == NULL)
return NULL;
isbs->bs = (struct apk_bstream) {
.read = is_bs_read,
.close = is_bs_close,
};
isbs->is = istream;
csum_init(&isbs->csum_ctx);
return &isbs->bs;
}
struct apk_bstream *apk_bstream_from_fd(int fd)
{
/* FIXME: Write mmap based bstream for files */
return apk_bstream_from_istream(apk_istream_from_fd(fd));
}
apk_blob_t apk_blob_from_istream(struct apk_istream *is, size_t size)
{
void *ptr;
size_t rsize;
ptr = malloc(size);
if (ptr == NULL)
return APK_BLOB_NULL;
rsize = is->read(is, ptr, size);
if (rsize < 0) {
free(ptr);
return APK_BLOB_NULL;
}
if (rsize != size)
ptr = realloc(ptr, rsize);
return APK_BLOB_PTR_LEN(ptr, rsize);
}
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