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Add support for multisession on Level 3 images.

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This commit is contained in:
Vreixo Formoso
2008-08-19 02:45:20 +02:00
parent 3a503a3e85
commit 2e99e1aac9
9 changed files with 497 additions and 461 deletions
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181
libisofs/eltorito.c
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@@ -1,8 +1,8 @@
/*
* 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 as
*
* 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 as
* published by the Free Software Foundation. See COPYING file for details.
*/
@@ -26,7 +26,7 @@ struct boot_info_table {
uint8_t bi_file BP(5, 8); /* LBA of boot file */
uint8_t bi_length BP(9, 12); /* Length of boot file */
uint8_t bi_csum BP(13, 16); /* Checksum of boot file */
uint8_t bi_reserved BP(17, 56); /* Reserved */
uint8_t bi_reserved BP(17, 56); /* Reserved */
};
/**
@@ -67,7 +67,7 @@ void el_torito_set_load_seg(ElToritoBootImage *bootimg, short segment)
/**
* Sets the number of sectors (512b) to be load at load segment during
* the initial boot procedure. This is only for no emulation boot images,
* the initial boot procedure. This is only for no emulation boot images,
* and is a NOP for other image types.
*/
void el_torito_set_load_size(ElToritoBootImage *bootimg, short sectors)
@@ -109,7 +109,7 @@ int iso_tree_add_boot_node(IsoDir *parent, const char *name, IsoBoot **boot)
if (boot) {
*boot = NULL;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
@@ -162,7 +162,7 @@ int iso_tree_add_boot_node(IsoDir *parent, const char *name, IsoBoot **boot)
}
static
static
int create_image(IsoImage *image, const char *image_path,
enum eltorito_boot_media_type type,
struct el_torito_boot_image **bootimg)
@@ -182,18 +182,18 @@ int create_image(IsoImage *image, const char *image_path,
if (ret == 0) {
return ISO_NODE_DOESNT_EXIST;
}
if (imgfile->type != LIBISO_FILE) {
return ISO_BOOT_IMAGE_NOT_VALID;
}
stream = ((IsoFile*)imgfile)->stream;
/* we need to read the image at least two times */
if (!iso_stream_is_repeatable(stream)) {
return ISO_BOOT_IMAGE_NOT_VALID;
}
switch (type) {
case ELTORITO_FLOPPY_EMUL:
switch (iso_stream_get_size(stream)) {
@@ -211,9 +211,9 @@ int create_image(IsoImage *image, const char *image_path,
"Invalid image size %d Kb. Must be one of 1.2, 1.44"
"or 2.88 Mb", iso_stream_get_size(stream) / 1024);
return ISO_BOOT_IMAGE_NOT_VALID;
break;
break;
}
/* it seems that for floppy emulation we need to load
/* it seems that for floppy emulation we need to load
* a single sector (512b) */
load_sectors = 1;
break;
@@ -222,7 +222,7 @@ int create_image(IsoImage *image, const char *image_path,
size_t i;
struct hard_disc_mbr mbr;
int used_partition;
/* read the MBR on disc and get the type of the partition */
ret = iso_stream_open(stream);
if (ret < 0) {
@@ -237,14 +237,14 @@ int create_image(IsoImage *image, const char *image_path,
"Can't read MBR from image file.");
return ret < 0 ? ret : ISO_FILE_READ_ERROR;
}
/* check valid MBR signature */
if ( mbr.sign1 != 0x55 || mbr.sign2 != 0xAA ) {
iso_msg_submit(image->id, ISO_BOOT_IMAGE_NOT_VALID, 0,
"Invalid MBR. Wrong signature.");
return ISO_BOOT_IMAGE_NOT_VALID;
}
/* ensure single partition */
used_partition = -1;
for (i = 0; i < 4; ++i) {
@@ -252,7 +252,7 @@ int create_image(IsoImage *image, const char *image_path,
/* it's an used partition */
if (used_partition != -1) {
iso_msg_submit(image->id, ISO_BOOT_IMAGE_NOT_VALID, 0,
"Invalid MBR. At least 2 partitions: %d and "
"Invalid MBR. At least 2 partitions: %d and "
"%d, are being used\n", used_partition, i);
return ISO_BOOT_IMAGE_NOT_VALID;
} else
@@ -262,15 +262,15 @@ int create_image(IsoImage *image, const char *image_path,
partition_type = mbr.partition[used_partition].type;
}
boot_media_type = 4;
/* only load the MBR */
load_sectors = 1;
break;
case ELTORITO_NO_EMUL:
boot_media_type = 0;
break;
break;
}
boot = calloc(1, sizeof(struct el_torito_boot_image));
if (boot == NULL) {
return ISO_OUT_OF_MEM;
@@ -281,11 +281,11 @@ int create_image(IsoImage *image, const char *image_path,
boot->type = boot_media_type;
boot->load_size = load_sectors;
boot->partition_type = partition_type;
if (bootimg) {
*bootimg = boot;
}
return ISO_SUCCESS;
}
@@ -298,14 +298,14 @@ int iso_image_set_boot_image(IsoImage *image, const char *image_path,
struct el_torito_boot_catalog *catalog;
ElToritoBootImage *boot_image= NULL;
IsoBoot *cat_node= NULL;
if (image == NULL || image_path == NULL || catalog_path == NULL) {
return ISO_NULL_POINTER;
}
if (image->bootcat != NULL) {
return ISO_IMAGE_ALREADY_BOOTABLE;
}
/* create the node for the catalog */
{
IsoDir *parent;
@@ -314,8 +314,8 @@ int iso_image_set_boot_image(IsoImage *image, const char *image_path,
if (catdir == NULL) {
return ISO_OUT_OF_MEM;
}
/* get both the dir and the name */
/* get both the dir and the name */
catname = strrchr(catdir, '/');
if (catname == NULL) {
free(catdir);
@@ -345,13 +345,13 @@ int iso_image_set_boot_image(IsoImage *image, const char *image_path,
return ret;
}
}
/* create the boot image */
ret = create_image(image, image_path, type, &boot_image);
if (ret < 0) {
goto boot_image_cleanup;
}
/* creates the catalog with the given image */
catalog = malloc(sizeof(struct el_torito_boot_catalog));
if (catalog == NULL) {
@@ -362,13 +362,13 @@ int iso_image_set_boot_image(IsoImage *image, const char *image_path,
catalog->node = cat_node;
iso_node_ref((IsoNode*)cat_node);
image->bootcat = catalog;
if (boot) {
*boot = boot_image;
}
return ISO_SUCCESS;
boot_image_cleanup:;
if (cat_node) {
iso_node_take((IsoNode*)cat_node);
@@ -383,32 +383,32 @@ boot_image_cleanup:;
/**
* Get El-Torito boot image of an ISO image, if any.
*
*
* This can be useful, for example, to check if a volume read from a previous
* session or an existing image is bootable. It can also be useful to get
* the image and catalog tree nodes. An application would want those, for
* the image and catalog tree nodes. An application would want those, for
* example, to prevent the user removing it.
*
*
* Both nodes are owned by libisofs and should not be freed. You can get your
* own ref with iso_node_ref(). You can can also check if the node is already
* on the tree by getting its parent (note that when reading El-Torito info
* from a previous image, the nodes might not be on the tree even if you haven't
* removed them). Remember that you'll need to get a new ref
* (with iso_node_ref()) before inserting them again to the tree, and probably
* own ref with iso_node_ref(). You can can also check if the node is already
* on the tree by getting its parent (note that when reading El-Torito info
* from a previous image, the nodes might not be on the tree even if you haven't
* removed them). Remember that you'll need to get a new ref
* (with iso_node_ref()) before inserting them again to the tree, and probably
* you will also need to set the name or permissions.
*
*
* @param image
* The image from which to get the boot image.
* @param boot
* If not NULL, it will be filled with a pointer to the boot image, if
* any. That object is owned by the IsoImage and should not be freed by
* If not NULL, it will be filled with a pointer to the boot image, if
* any. That object is owned by the IsoImage and should not be freed by
* the user, nor dereferenced once the last reference to the IsoImage was
* disposed via iso_image_unref().
* @param imgnode
* @param imgnode
* When not NULL, it will be filled with the image tree node. No extra ref
* is added, you can use iso_node_ref() to get one if you need it.
* @param catnode
* When not NULL, it will be filled with the catnode tree node. No extra
* @param catnode
* When not NULL, it will be filled with the catnode tree node. No extra
* ref is added, you can use iso_node_ref() to get one if you need it.
* @return
* 1 on success, 0 is the image is not bootable (i.e., it has no El-Torito
@@ -423,7 +423,7 @@ int iso_image_get_boot_image(IsoImage *image, ElToritoBootImage **boot,
if (image->bootcat == NULL) {
return 0;
}
/* ok, image is bootable */
if (boot) {
*boot = image->bootcat->image;
@@ -438,8 +438,8 @@ int iso_image_get_boot_image(IsoImage *image, ElToritoBootImage **boot,
}
/**
* Removes the El-Torito bootable image.
*
* Removes the El-Torito bootable image.
*
* The IsoBoot node that acts as placeholder for the catalog is also removed
* for the image tree, if there.
* If the image is not bootable (don't have el-torito boot image) this function
@@ -449,13 +449,13 @@ void iso_image_remove_boot_image(IsoImage *image)
{
if (image == NULL || image->bootcat == NULL)
return;
/*
* remove catalog node from its parent
* (the reference will be disposed next)
/*
* remove catalog node from its parent
* (the reference will be disposed next)
*/
iso_node_take((IsoNode*)image->bootcat->node);
/* free boot catalog and image, including references to nodes */
el_torito_boot_catalog_free(image->bootcat);
image->bootcat = NULL;
@@ -464,11 +464,11 @@ void iso_image_remove_boot_image(IsoImage *image)
void el_torito_boot_catalog_free(struct el_torito_boot_catalog *cat)
{
struct el_torito_boot_image *image;
if (cat == NULL) {
return;
}
image = cat->image;
iso_node_unref((IsoNode*)image->image);
free(image);
@@ -486,19 +486,19 @@ struct catalog_stream
int offset; /* -1 if stream is not openned */
};
static void
static void
write_validation_entry(uint8_t *buf)
{
size_t i;
int checksum;
struct el_torito_validation_entry *ve =
struct el_torito_validation_entry *ve =
(struct el_torito_validation_entry*)buf;
ve->header_id[0] = 1;
ve->platform_id[0] = 0; /* 0: 80x86, 1: PowerPC, 2: Mac */
ve->key_byte1[0] = 0x55;
ve->key_byte2[0] = 0xAA;
/* calculate the checksum, to ensure sum of all words is 0 */
checksum = 0;
for (i = 0; i < sizeof(struct el_torito_validation_entry); i += 2) {
@@ -515,9 +515,9 @@ static void
write_section_entry(uint8_t *buf, Ecma119Image *t)
{
struct el_torito_boot_image *img;
struct el_torito_section_entry *se =
struct el_torito_section_entry *se =
(struct el_torito_section_entry*)buf;
img = t->catalog->image;
se->boot_indicator[0] = img->bootable ? 0x88 : 0x00;
@@ -525,7 +525,7 @@ write_section_entry(uint8_t *buf, Ecma119Image *t)
iso_lsb(se->load_seg, img->load_seg, 2);
se->system_type[0] = img->partition_type;
iso_lsb(se->sec_count, img->load_size, 2);
iso_lsb(se->block, t->bootimg->block, 4);
iso_lsb(se->block, t->bootimg->sections[0].block, 4);
}
static
@@ -536,13 +536,13 @@ int catalog_open(IsoStream *stream)
return ISO_NULL_POINTER;
}
data = stream->data;
if (data->offset != -1) {
return ISO_FILE_ALREADY_OPENED;
}
memset(data->buffer, 0, BLOCK_SIZE);
/* fill the buffer with the catalog contents */
write_validation_entry(data->buffer);
@@ -561,7 +561,7 @@ int catalog_close(IsoStream *stream)
return ISO_NULL_POINTER;
}
data = stream->data;
if (data->offset == -1) {
return ISO_FILE_NOT_OPENED;
}
@@ -587,11 +587,11 @@ int catalog_read(IsoStream *stream, void *buf, size_t count)
return ISO_WRONG_ARG_VALUE;
}
data = stream->data;
if (data->offset == -1) {
return ISO_FILE_NOT_OPENED;
}
len = MIN(count, BLOCK_SIZE - data->offset);
memcpy(buf, data->buffer + data->offset, len);
return len;
@@ -606,7 +606,7 @@ int catalog_is_repeatable(IsoStream *stream)
/**
* fs_id will be the id reserved for El-Torito
* dev_id will be 0 for catalog, 1 for boot image (if needed)
* we leave ino_id for future use when we support multiple boot images
* we leave ino_id for future use when we support multiple boot images
*/
static
void catalog_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
@@ -636,7 +636,7 @@ IsoStreamIface catalog_stream_class = {
};
/**
* Create an IsoStream for writing El-Torito catalog for a given target.
* Create an IsoStream for writing El-Torito catalog for a given target.
*/
static
int catalog_stream_new(Ecma119Image *target, IsoStream **stream)
@@ -675,17 +675,17 @@ int el_torito_catalog_file_src_create(Ecma119Image *target, IsoFileSrc **src)
int ret;
IsoFileSrc *file;
IsoStream *stream;
if (target == NULL || src == NULL || target->catalog == NULL) {
return ISO_OUT_OF_MEM;
}
if (target->cat != NULL) {
/* catalog file src already created */
*src = target->cat;
return ISO_SUCCESS;
}
file = malloc(sizeof(IsoFileSrc));
if (file == NULL) {
return ISO_OUT_OF_MEM;
@@ -696,10 +696,11 @@ int el_torito_catalog_file_src_create(Ecma119Image *target, IsoFileSrc **src)
free(file);
return ret;
}
/* fill fields */
file->prev_img = 0; /* TODO allow copy of old img catalog???? */
file->block = 0; /* to be filled later */
file->nsections = 0; /* to be filled later */
file->sections = NULL;
file->sort_weight = 1000; /* slightly high */
file->stream = stream;
@@ -746,34 +747,34 @@ int eltorito_writer_write_vol_desc(IsoImageWriter *writer)
memcpy(vol.std_identifier, "CD001", 5);
vol.vol_desc_version[0] = 1;
memcpy(vol.boot_sys_id, "EL TORITO SPECIFICATION", 23);
iso_lsb(vol.boot_catalog, t->cat->block, 4);
iso_lsb(vol.boot_catalog, t->cat->sections[0].block, 4);
return iso_write(t, &vol, sizeof(struct ecma119_boot_rec_vol_desc));
}
/**
* Patch an isolinux boot image.
*
*
* @return
* 1 on success, 0 error (but continue), < 0 error
*/
static
static
int patch_boot_image(uint8_t *buf, Ecma119Image *t, size_t imgsize)
{
struct boot_info_table *info;
uint32_t checksum;
size_t offset;
if (imgsize < 64) {
return iso_msg_submit(t->image->id, ISO_ISOLINUX_CANT_PATCH, 0,
"Isolinux image too small. We won't patch it.");
}
/* compute checksum, as the the sum of all 32 bit words in boot image
* from offset 64 */
checksum = 0;
offset = (size_t) 64;
while (offset <= imgsize - 4) {
checksum += iso_read_lsb(buf + offset, 4);
offset += 4;
@@ -783,12 +784,12 @@ int patch_boot_image(uint8_t *buf, Ecma119Image *t, size_t imgsize)
return iso_msg_submit(t->image->id, ISO_ISOLINUX_CANT_PATCH, 0,
"Unexpected isolinux image length. Patch might not work.");
}
/* patch boot info table */
info = (struct boot_info_table*)(buf + 8);
/*memset(info, 0, sizeof(struct boot_info_table));*/
iso_lsb(info->bi_pvd, t->ms_block + 16, 4);
iso_lsb(info->bi_file, t->bootimg->block, 4);
iso_lsb(info->bi_file, t->bootimg->sections[0].block, 4);
iso_lsb(info->bi_length, imgsize, 4);
iso_lsb(info->bi_csum, checksum, 4);
return ISO_SUCCESS;
@@ -799,7 +800,7 @@ int eltorito_writer_write_data(IsoImageWriter *writer)
{
/*
* We have nothing to write, but if we need to patch an isolinux image,
* this is a good place to do so.
* this is a good place to do so.
*/
Ecma119Image *t;
int ret;
@@ -809,7 +810,7 @@ int eltorito_writer_write_data(IsoImageWriter *writer)
}
t = writer->target;
if (t->catalog->image->isolinux) {
/* we need to patch the image */
size_t size;
@@ -830,13 +831,13 @@ int eltorito_writer_write_data(IsoImageWriter *writer)
if (ret != size) {
return (ret < 0) ? ret : ISO_FILE_READ_ERROR;
}
/* ok, patch the read buffer */
ret = patch_boot_image(buf, t, size);
if (ret < 0) {
return ret;
}
/* replace the original stream with a memory stream that reads from
* the patched buffer */
ret = iso_memory_stream_new(buf, size, &new);
@@ -878,7 +879,7 @@ int eltorito_writer_create(Ecma119Image *target)
/* add this writer to image */
target->writers[target->nwriters++] = writer;
/*
/*
* get catalog and image file sources.
* Note that the catalog may be already added, when creating the low
* level ECMA-119 tree.
@@ -895,7 +896,7 @@ int eltorito_writer_create(Ecma119Image *target)
return ret;
}
target->bootimg = src;
/* if we have selected to patch the image, it needs to be copied always */
if (target->catalog->image->isolinux) {
src->prev_img = 0;