You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

575 lines
16 KiB

/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*/
#include "filesrc.h"
#include "node.h"
#include "util.h"
#include "writer.h"
#include "messages.h"
#include "image.h"
#include "stream.h"
#ifdef Libisofs_with_checksumS
#include "md5.h"
#endif /* Libisofs_with_checksumS */
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#ifndef PATH_MAX
#define PATH_MAX Libisofs_default_path_maX
#endif
int iso_file_src_cmp(const void *n1, const void *n2)
{
int ret;
const IsoFileSrc *f1, *f2;
if (n1 == n2) {
return 0; /* Normally just a shortcut.
But important if Libisofs_file_src_cmp_non_zerO */
}
f1 = (const IsoFileSrc *)n1;
f2 = (const IsoFileSrc *)n2;
ret = iso_stream_cmp_ino(f1->stream, f2->stream, 0);
return ret;
}
int iso_file_src_create(Ecma119Image *img, IsoFile *file, IsoFileSrc **src)
{
int ret;
IsoFileSrc *fsrc;
unsigned int fs_id;
dev_t dev_id;
ino_t ino_id;
#ifdef Libisofs_with_checksumS
int cret, no_md5= 0;
void *xipt = NULL;
#endif
if (img == NULL || file == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
iso_stream_get_id(file->stream, &fs_id, &dev_id, &ino_id);
fsrc = calloc(1, sizeof(IsoFileSrc));
if (fsrc == NULL) {
return ISO_OUT_OF_MEM;
}
/* fill key and other atts */
fsrc->prev_img = file->from_old_session;
if (file->from_old_session && img->appendable) {
/*
* On multisession discs we keep file sections from old image.
*/
int ret = iso_file_get_old_image_sections(file, &(fsrc->nsections),
&(fsrc->sections), 0);
if (ret < 0) {
free(fsrc);
return ISO_OUT_OF_MEM;
}
} else {
/*
* For new files, or for image copy, we compute our own file sections.
* Block and size of each section will be filled later.
*/
off_t section_size = iso_stream_get_size(file->stream);
if (section_size > (off_t) MAX_ISO_FILE_SECTION_SIZE) {
fsrc->nsections = DIV_UP(section_size - (off_t) MAX_ISO_FILE_SECTION_SIZE,
(off_t)ISO_EXTENT_SIZE) + 1;
} else {
fsrc->nsections = 1;
}
fsrc->sections = calloc(fsrc->nsections, sizeof(struct iso_file_section));
}
fsrc->sort_weight = file->sort_weight;
fsrc->stream = file->stream;
/* insert the filesrc in the tree */
ret = iso_rbtree_insert(img->files, fsrc, (void**)src);
if (ret <= 0) {
#ifdef Libisofs_with_checksumS
if (ret == 0 && (*src)->checksum_index > 0) {
/* Duplicate file source was mapped to previously registered source
*/
cret = iso_file_set_isofscx(file, (*src)->checksum_index, 0);
if (cret < 0)
ret = cret;
}
#endif /* Libisofs_with_checksumS */
free(fsrc->sections);
free(fsrc);
return ret;
}
iso_stream_ref(fsrc->stream);
#ifdef Libisofs_with_checksumS
if ((img->md5_file_checksums & 1) &&
file->from_old_session && img->appendable) {
ret = iso_node_get_xinfo((IsoNode *) file, checksum_md5_xinfo_func,
&xipt);
if (ret <= 0)
ret = iso_node_get_xinfo((IsoNode *) file, checksum_cx_xinfo_func,
&xipt);
if (ret <= 0)
/* Omit MD5 indexing with old image nodes which have no MD5 */
no_md5 = 1;
}
if ((img->md5_file_checksums & 1) && !no_md5) {
img->checksum_idx_counter++;
if (img->checksum_idx_counter < 0x80000000) {
fsrc->checksum_index = img->checksum_idx_counter;
} else {
fsrc->checksum_index= 0;
img->checksum_idx_counter= 0x80000000; /* keep from rolling over */
}
cret = iso_file_set_isofscx(file, (*src)->checksum_index, 0);
if (cret < 0)
return cret;
}
#endif /* Libisofs_with_checksumS */
return ISO_SUCCESS;
}
/**
* Add a given IsoFileSrc to the given image target.
*
* The IsoFileSrc will be cached in a tree to prevent the same file for
* being written several times to image. If you call again this function
* with a node that refers to the same source file, the previously
* created one will be returned.
*
* @param img
* The image where this file is to be written
* @param new
* The IsoFileSrc to add
* @param src
* Will be filled with a pointer to the IsoFileSrc really present in
* the tree. It could be different than new if the same file already
* exists in the tree.
* @return
* 1 on success, 0 if file already exists on tree, < 0 error
*/
int iso_file_src_add(Ecma119Image *img, IsoFileSrc *new, IsoFileSrc **src)
{
int ret;
if (img == NULL || new == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
/* insert the filesrc in the tree */
ret = iso_rbtree_insert(img->files, new, (void**)src);
return ret;
}
void iso_file_src_free(void *node)
{
iso_stream_unref(((IsoFileSrc*)node)->stream);
free(((IsoFileSrc*)node)->sections);
free(node);
}
off_t iso_file_src_get_size(IsoFileSrc *file)
{
return iso_stream_get_size(file->stream);
}
static int cmp_by_weight(const void *f1, const void *f2)
{
IsoFileSrc *f = *((IsoFileSrc**)f1);
IsoFileSrc *g = *((IsoFileSrc**)f2);
/* higher weighted first */
return g->sort_weight - f->sort_weight;
}
static
int is_ms_file(void *arg)
{
IsoFileSrc *f = (IsoFileSrc *)arg;
return f->prev_img ? 0 : 1;
}
static
int filesrc_writer_compute_data_blocks(IsoImageWriter *writer)
{
size_t i, size;
Ecma119Image *t;
IsoFileSrc **filelist;
int (*inc_item)(void *);
if (writer == NULL) {
return ISO_ASSERT_FAILURE;
}
t = writer->target;
/* on appendable images, ms files shouldn't be included */
if (t->appendable) {
inc_item = is_ms_file;
} else {
inc_item = NULL;
}
/* store the filesrcs in a array */
filelist = (IsoFileSrc**)iso_rbtree_to_array(t->files, inc_item, &size);
if (filelist == NULL) {
return ISO_OUT_OF_MEM;
}
/* sort files by weight, if needed */
if (t->sort_files) {
qsort(filelist, size, sizeof(void*), cmp_by_weight);
}
/* fill block value */
for (i = 0; i < size; ++i) {
int extent = 0;
IsoFileSrc *file = filelist[i];
off_t section_size = iso_stream_get_size(file->stream);
for (extent = 0; extent < file->nsections - 1; ++extent) {
file->sections[extent].block = t->curblock + extent *
(ISO_EXTENT_SIZE / BLOCK_SIZE);
file->sections[extent].size = ISO_EXTENT_SIZE;
section_size -= (off_t) ISO_EXTENT_SIZE;
}
/*
* final section
*/
file->sections[extent].block = t->curblock + extent * (ISO_EXTENT_SIZE / BLOCK_SIZE);
file->sections[extent].size = (uint32_t)section_size;
t->curblock += DIV_UP(iso_file_src_get_size(file), BLOCK_SIZE);
}
/* the list is only needed by this writer, store locally */
writer->data = filelist;
return ISO_SUCCESS;
}
static
int filesrc_writer_write_vol_desc(IsoImageWriter *writer)
{
/* nothing needed */
return ISO_SUCCESS;
}
/* open a file, i.e., its Stream */
static inline
int filesrc_open(IsoFileSrc *file)
{
return iso_stream_open(file->stream);
}
static inline
int filesrc_close(IsoFileSrc *file)
{
return iso_stream_close(file->stream);
}
/**
* @return
* 1 ok, 0 EOF, < 0 error
*/
static
int filesrc_read(IsoFileSrc *file, char *buf, size_t count)
{
size_t got;
return iso_stream_read_buffer(file->stream, buf, count, &got);
}
#ifdef Libisofs_with_checksumS
/* @return 1=ok, md5 is valid,
0= not ok, go on,
<0 fatal error, abort
*/
static
int filesrc_make_md5(Ecma119Image *t, IsoFileSrc *file, char md5[16], int flag)
{
return iso_stream_make_md5(file->stream, md5, 0);
}
#endif /* Libisofs_with_checksumS */
static
int filesrc_writer_write_data(IsoImageWriter *writer)
{
int res, ret, was_error;
size_t i, b;
Ecma119Image *t;
IsoFileSrc *file;
IsoFileSrc **filelist;
char name[PATH_MAX];
char buffer[BLOCK_SIZE];
off_t file_size;
uint32_t nblocks;
#ifdef Libisofs_with_checksumS
void *ctx= NULL;
char md5[16], pre_md5[16];
int pre_md5_valid = 0;
#endif
if (writer == NULL) {
return ISO_ASSERT_FAILURE;
}
t = writer->target;
filelist = writer->data;
iso_msg_debug(t->image->id, "Writing Files...");
i = 0;
while ((file = filelist[i++]) != NULL) {
was_error = 0;
file_size = iso_file_src_get_size(file);
nblocks = DIV_UP(file_size, BLOCK_SIZE);
#ifdef Libisofs_with_checksumS
pre_md5_valid = 0;
if (file->checksum_index > 0 && (t->md5_file_checksums & 2)) {
/* Obtain an MD5 of content by a first read pass */
pre_md5_valid = filesrc_make_md5(t, file, pre_md5, 0);
}
#endif /* Libisofs_with_checksumS */
res = filesrc_open(file);
iso_stream_get_file_name(file->stream, name);
if (res < 0) {
/*
* UPS, very ugly error, the best we can do is just to write
* 0's to image
*/
iso_report_errfile(name, ISO_FILE_CANT_WRITE, 0, 0);
was_error = 1;
res = iso_msg_submit(t->image->id, ISO_FILE_CANT_WRITE, res,
"File \"%s\" can't be opened. Filling with 0s.", name);
if (res < 0) {
ret = res; /* aborted due to error severity */
goto ex;
}
memset(buffer, 0, BLOCK_SIZE);
for (b = 0; b < nblocks; ++b) {
res = iso_write(t, buffer, BLOCK_SIZE);
if (res < 0) {
/* ko, writer error, we need to go out! */
ret = res;
goto ex;
}
}
continue;
} else if (res > 1) {
iso_report_errfile(name, ISO_FILE_CANT_WRITE, 0, 0);
was_error = 1;
res = iso_msg_submit(t->image->id, ISO_FILE_CANT_WRITE, 0,
"Size of file \"%s\" has changed. It will be %s", name,
(res == 2 ? "truncated" : "padded with 0's"));
if (res < 0) {
filesrc_close(file);
ret = res; /* aborted due to error severity */
goto ex;
}
}
#ifdef LIBISOFS_VERBOSE_DEBUG
else {
iso_msg_debug(t->image->id, "Writing file %s", name);
}
#endif
#ifdef Libisofs_with_checksumS
if (file->checksum_index > 0) {
/* initialize file checksum */
res = iso_md5_start(&ctx);
if (res <= 0)
file->checksum_index = 0;
}
#endif /* Libisofs_with_checksumS */
/* write file contents to image */
for (b = 0; b < nblocks; ++b) {
int wres;
res = filesrc_read(file, buffer, BLOCK_SIZE);
if (res < 0) {
/* read error */
break;
}
wres = iso_write(t, buffer, BLOCK_SIZE);
if (wres < 0) {
/* ko, writer error, we need to go out! */
filesrc_close(file);
ret = wres;
goto ex;
}
#ifdef Libisofs_with_checksumS
if (file->checksum_index > 0) {
/* Add to file checksum */
if (file_size - b * BLOCK_SIZE > BLOCK_SIZE)
res = BLOCK_SIZE;
else
res = file_size - b * BLOCK_SIZE;
res = iso_md5_compute(ctx, buffer, res);
if (res <= 0)
file->checksum_index = 0;
}
#endif /* Libisofs_with_checksumS */
}
filesrc_close(file);
if (b < nblocks) {
/* premature end of file, due to error or eof */
iso_report_errfile(name, ISO_FILE_CANT_WRITE, 0, 0);
was_error = 1;
if (res < 0) {
/* error */
res = iso_msg_submit(t->image->id, ISO_FILE_CANT_WRITE, res,
"Read error in file %s.", name);
} else {
/* eof */
res = iso_msg_submit(t->image->id, ISO_FILE_CANT_WRITE, 0,
"Premature end of file %s.", name);
}
if (res < 0) {
ret = res; /* aborted due error severity */
goto ex;
}
/* fill with 0s */
iso_msg_submit(t->image->id, ISO_FILE_CANT_WRITE, 0,
"Filling with 0");
memset(buffer, 0, BLOCK_SIZE);
while (b++ < nblocks) {
res = iso_write(t, buffer, BLOCK_SIZE);
if (res < 0) {
/* ko, writer error, we need to go out! */
ret = res;
goto ex;
}
#ifdef Libisofs_with_checksumS
if (file->checksum_index > 0) {
/* Add to file checksum */
if (file_size - b * BLOCK_SIZE > BLOCK_SIZE)
res = BLOCK_SIZE;
else
res = file_size - b * BLOCK_SIZE;
res = iso_md5_compute(ctx, buffer, res);
if (res <= 0)
file->checksum_index = 0;
}
#endif /* Libisofs_with_checksumS */
}
}
#ifdef Libisofs_with_checksumS
if (file->checksum_index > 0) {
/* Obtain checksum and dispose checksum context */
res = iso_md5_end(&ctx, md5);
if (res <= 0)
file->checksum_index = 0;
if ((t->md5_file_checksums & 2) && pre_md5_valid > 0 &&
!was_error) {
if (! iso_md5_match(md5, pre_md5)) {
/* Issue MISHAP event */
iso_report_errfile(name, ISO_MD5_STREAM_CHANGE, 0, 0);
was_error = 1;
res = iso_msg_submit(t->image->id, ISO_MD5_STREAM_CHANGE,0,
"Content of file '%s' changed while it was written into the image.",
name);
if (res < 0) {
ret = res; /* aborted due to error severity */
goto ex;
}
}
}
/* Write md5 into checksum buffer at file->checksum_index */
memcpy(t->checksum_buffer + 16 * file->checksum_index, md5, 16);
}
#endif /* Libisofs_with_checksumS */
}
ret = ISO_SUCCESS;
ex:;
#ifdef Libisofs_with_checksumS
if (ctx != NULL) /* avoid any memory leak */
iso_md5_end(&ctx, md5);
#endif
return ret;
}
static
int filesrc_writer_free_data(IsoImageWriter *writer)
{
/* free the list of files (contents are free together with the tree) */
free(writer->data);
return ISO_SUCCESS;
}
int iso_file_src_writer_create(Ecma119Image *target)
{
IsoImageWriter *writer;
writer = malloc(sizeof(IsoImageWriter));
if (writer == NULL) {
return ISO_OUT_OF_MEM;
}
writer->compute_data_blocks = filesrc_writer_compute_data_blocks;
writer->write_vol_desc = filesrc_writer_write_vol_desc;
writer->write_data = filesrc_writer_write_data;
writer->free_data = filesrc_writer_free_data;
writer->data = NULL;
writer->target = target;
/* add this writer to image */
target->writers[target->nwriters++] = writer;
return ISO_SUCCESS;
}