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coreboot-kgpe-d16/util/cbfstool/common.c

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/*
* common utility functions for cbfstool
*
* Copyright (C) 2009 coresystems GmbH
* written by Patrick Georgi <patrick.georgi@coresystems.de>
* Copyright (C) 2012 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "common.h"
#include "cbfs.h"
#include "elf.h"
/* Utilities */
/* Small, OS/libc independent runtime check for endianess */
int is_big_endian(void)
{
static const uint32_t inttest = 0x12345678;
uint8_t inttest_lsb = *(uint8_t *)&inttest;
if (inttest_lsb == 0x12) {
return 1;
}
return 0;
}
/* Buffer and file I/O */
int buffer_create(struct buffer *buffer, size_t size, const char *name) {
buffer->name = strdup(name);
buffer->size = size;
buffer->data = (char *)malloc(buffer->size);
if (!buffer->data) {
fprintf(stderr, "buffer_create: Insufficient memory (0x%zx).\n",
size);
}
return (buffer->data == NULL);
}
int buffer_from_file(struct buffer *buffer, const char *filename) {
FILE *fp = fopen(filename, "rb");
if (!fp) {
perror(filename);
return -1;
}
fseek(fp, 0, SEEK_END);
buffer->size = ftell(fp);
buffer->name = strdup(filename);
rewind(fp);
buffer->data = (char *)malloc(buffer->size);
assert(buffer->data);
if (fread(buffer->data, 1, buffer->size, fp) != buffer->size) {
fprintf(stderr, "incomplete read: %s\n", filename);
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}
int buffer_write_file(struct buffer *buffer, const char *filename) {
FILE *fp = fopen(filename, "wb");
if (!fp) {
perror(filename);
return -1;
}
assert(buffer && buffer->data);
if (fwrite(buffer->data, 1, buffer->size, fp) != buffer->size) {
fprintf(stderr, "incomplete write: %s\n", filename);
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}
void buffer_delete(struct buffer *buffer) {
assert(buffer);
if (buffer->name) {
free(buffer->name);
buffer->name = NULL;
}
if (buffer->data) {
free(buffer->data);
buffer->data = NULL;
}
buffer->size = 0;
}
size_t getfilesize(const char *filename)
{
size_t size;
FILE *file = fopen(filename, "rb");
if (file == NULL)
return -1;
fseek(file, 0, SEEK_END);
size = ftell(file);
fclose(file);
return size;
}
void *loadfile(const char *filename, uint32_t * romsize_p, void *content,
int place)
{
FILE *file = fopen(filename, "rb");
if (file == NULL)
return NULL;
fseek(file, 0, SEEK_END);
*romsize_p = ftell(file);
fseek(file, 0, SEEK_SET);
if (!content) {
content = malloc(*romsize_p);
if (!content) {
ERROR("Could not get %d bytes for file %s\n",
*romsize_p, filename);
exit(1);
}
} else if (place == SEEK_END)
content -= *romsize_p;
if (!fread(content, *romsize_p, 1, file)) {
ERROR("Failed to read %s\n", filename);
return NULL;
}
fclose(file);
return content;
}
/* N.B.: there are declarations here that were shadowed in functions.
* Hence the rather clumsy cbfstool_ prefixes.
*/
static struct cbfs_header *cbfstool_master_header;
static uint32_t phys_start, phys_end, align;
uint32_t romsize;
void *cbfstool_offset;
uint32_t arch = CBFS_ARCHITECTURE_UNKNOWN;
static struct {
uint32_t arch;
const char *name;
} arch_names[] = {
{ CBFS_ARCHITECTURE_ARMV7, "armv7" },
{ CBFS_ARCHITECTURE_X86, "x86" },
{ CBFS_ARCHITECTURE_UNKNOWN, "unknown" }
};
uint32_t string_to_arch(const char *arch_string)
{
int i;
uint32_t ret = CBFS_ARCHITECTURE_UNKNOWN;
for (i = 0; i < ARRAY_SIZE(arch_names); i++) {
if (!strcasecmp(arch_string, arch_names[i].name)) {
ret = arch_names[i].arch;
break;
}
}
return ret;
}
const char *arch_to_string(uint32_t a)
{
int i;
const char *ret = NULL;
for (i = 0; i < ARRAY_SIZE(arch_names); i++) {
if (a == arch_names[i].arch) {
ret = arch_names[i].name;
break;
}
}
return ret;
}
int find_master_header(void *romarea, size_t size)
{
size_t offset;
if (cbfstool_master_header)
return 0;
for (offset = 0; offset < size - sizeof(struct cbfs_header); offset++) {
struct cbfs_header *tmp = romarea + offset;
if (tmp->magic == ntohl(CBFS_HEADER_MAGIC)) {
cbfstool_master_header = tmp;
break;
}
}
return cbfstool_master_header ? 0 : 1;
}
void recalculate_rom_geometry(void *romarea)
{
if (find_master_header(romarea, romsize)) {
ERROR("Cannot find master header\n");
exit(1);
}
/* Update old headers */
if (cbfstool_master_header->version == CBFS_HEADER_VERSION1 &&
ntohl(cbfstool_master_header->architecture) == CBFS_ARCHITECTURE_UNKNOWN) {
DEBUG("Updating CBFS master header to version 2\n");
cbfstool_master_header->architecture = htonl(CBFS_ARCHITECTURE_X86);
}
arch = ntohl(cbfstool_master_header->architecture);
switch (arch) {
case CBFS_ARCHITECTURE_ARMV7:
cbfstool_offset = romarea;
phys_start = (0 + ntohl(cbfstool_master_header->offset)) & 0xffffffff;
phys_end = romsize & 0xffffffff;
break;
case CBFS_ARCHITECTURE_X86:
cbfstool_offset = romarea + romsize - 0x100000000ULL;
phys_start = (0 - romsize + ntohl(cbfstool_master_header->offset)) &
0xffffffff;
phys_end = (0 - ntohl(cbfstool_master_header->bootblocksize) -
sizeof(struct cbfs_header)) & 0xffffffff;
break;
default:
ERROR("Unknown architecture\n");
exit(1);
}
align = ntohl(cbfstool_master_header->align);
}
void *loadrom(const char *filename)
{
void *romarea = loadfile(filename, &romsize, 0, SEEK_SET);
if (romarea == NULL)
return NULL;
recalculate_rom_geometry(romarea);
return romarea;
}
int writerom(const char *filename, void *start, uint32_t size)
{
FILE *file = fopen(filename, "wb");
if (!file) {
ERROR("Could not open '%s' for writing: ", filename);
perror("");
return 1;
}
if (fwrite(start, size, 1, file) != 1) {
ERROR("Could not write to '%s': ", filename);
perror("");
return 1;
}
fclose(file);
return 0;
}
int cbfs_file_header(unsigned long physaddr)
{
/* maybe improve this test */
return (strncmp(phys_to_virt(physaddr), "LARCHIVE", 8) == 0);
}
struct cbfs_file *cbfs_create_empty_file(uint32_t physaddr, uint32_t size)
{
struct cbfs_file *nextfile = (struct cbfs_file *)phys_to_virt(physaddr);
memcpy((char *)(nextfile->magic), "LARCHIVE", 8);
nextfile->len = htonl(size);
nextfile->type = htonl(0xffffffff);
nextfile->checksum = 0; // FIXME?
nextfile->offset = htonl(sizeof(struct cbfs_file) + 16);
memset(((void *)nextfile) + sizeof(struct cbfs_file), 0, 16);
return nextfile;
}
int iself(unsigned char *input)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *) input;
return !memcmp(ehdr->e_ident, ELFMAG, 4);
}
static struct filetypes_t {
uint32_t type;
const char *name;
} filetypes[] = {
{CBFS_COMPONENT_STAGE, "stage"},
{CBFS_COMPONENT_PAYLOAD, "payload"},
{CBFS_COMPONENT_OPTIONROM, "optionrom"},
{CBFS_COMPONENT_BOOTSPLASH, "bootsplash"},
{CBFS_COMPONENT_RAW, "raw"},
{CBFS_COMPONENT_VSA, "vsa"},
{CBFS_COMPONENT_MBI, "mbi"},
{CBFS_COMPONENT_MICROCODE, "microcode"},
{CBFS_COMPONENT_CMOS_DEFAULT, "cmos default"},
{CBFS_COMPONENT_CMOS_LAYOUT, "cmos layout"},
{CBFS_COMPONENT_DELETED, "deleted"},
{CBFS_COMPONENT_NULL, "null"}
};
void print_supported_filetypes(void)
{
int i, number = ARRAY_SIZE(filetypes);
for (i=0; i<number; i++) {
LOG(" %s%c", filetypes[i].name, (i==(number-1))?'\n':',');
if ((i%8) == 7)
LOG("\n");
}
}
const char *strfiletype(uint32_t number)
{
size_t i;
for (i = 0; i < (sizeof(filetypes) / sizeof(struct filetypes_t)); i++)
if (filetypes[i].type == number)
return filetypes[i].name;
return "unknown";
}
uint64_t intfiletype(const char *name)
{
size_t i;
for (i = 0; i < (sizeof(filetypes) / sizeof(struct filetypes_t)); i++)
if (strcmp(filetypes[i].name, name) == 0)
return filetypes[i].type;
return -1;
}
void print_cbfs_directory(const char *filename)
{
char *name = strdup(filename);
printf
("%s: %d kB, bootblocksize %d, romsize %d, offset 0x%x\n"
"alignment: %d bytes, architecture: %s\n\n",
basename(name), romsize / 1024, ntohl(cbfstool_master_header->bootblocksize),
romsize, ntohl(cbfstool_master_header->offset), align, arch_to_string(arch));
free(name);
printf("%-30s %-10s %-12s Size\n", "Name", "Offset", "Type");
uint32_t current = phys_start;
while (current < phys_end) {
if (!cbfs_file_header(current)) {
current += align;
continue;
}
struct cbfs_file *thisfile =
(struct cbfs_file *)phys_to_virt(current);
uint32_t length = ntohl(thisfile->len);
const char *fname = (char *)(phys_to_virt(current) + sizeof(struct cbfs_file));
if (strlen(fname) == 0)
fname = "(empty)";
printf("%-30s 0x%-8x %-12s %d\n", fname,
current - phys_start + ntohl(cbfstool_master_header->offset),
strfiletype(ntohl(thisfile->type)), length);
/* note the components of the subheader are in host order ... */
switch (ntohl(thisfile->type)) {
case CBFS_COMPONENT_STAGE:
{
struct cbfs_stage *stage = CBFS_SUBHEADER(thisfile);
INFO(" %s compression, entry: 0x%llx, load: 0x%llx, length: %d/%d\n",
stage->compression == CBFS_COMPRESS_LZMA ? "LZMA" : "no",
(unsigned long long)stage->entry,
(unsigned long long)stage->load,
stage->len,
stage->memlen);
break;
}
case CBFS_COMPONENT_PAYLOAD:
{
struct cbfs_payload_segment *payload = CBFS_SUBHEADER(thisfile);
while(payload) {
switch(payload->type) {
case PAYLOAD_SEGMENT_CODE:
case PAYLOAD_SEGMENT_DATA:
INFO(" %s (%s compression, offset: 0x%x, load: 0x%llx, length: %d/%d)\n",
payload->type == PAYLOAD_SEGMENT_CODE ? "code " : "data" ,
payload->compression == CBFS_COMPRESS_LZMA ? "LZMA" : "no",
ntohl(payload->offset),
(unsigned long long)ntohll(payload->load_addr),
ntohl(payload->len), ntohl(payload->mem_len));
break;
case PAYLOAD_SEGMENT_ENTRY:
INFO(" entry (0x%llx)\n", (unsigned long long)ntohll(payload->load_addr));
break;
case PAYLOAD_SEGMENT_BSS:
INFO(" BSS (address 0x%016llx, length 0x%x)\n", (unsigned long long)ntohll(payload->load_addr), ntohl(payload->len));
break;
case PAYLOAD_SEGMENT_PARAMS:
INFO(" parameters\n");
break;
default:
INFO(" %x (%s compression, offset: 0x%x, load: 0x%llx, length: %d/%d\n",
payload->type,
payload->compression == CBFS_COMPRESS_LZMA ? "LZMA" : "no",
ntohl(payload->offset),
(unsigned long long)ntohll(payload->load_addr),
ntohl(payload->len),
ntohl(payload->mem_len));
break;
}
if(payload->type == PAYLOAD_SEGMENT_ENTRY)
payload=NULL;
else
payload++;
}
break;
}
default:
break;
}
current =
ALIGN(current + ntohl(thisfile->len) +
ntohl(thisfile->offset), align);
}
}
int extract_file_from_cbfs(const char *filename, const char *payloadname, const char *outpath)
{
FILE *outfile = NULL;
uint32_t current = phys_start;
while (current < phys_end) {
if (!cbfs_file_header(current)) {
current += align;
continue;
}
// Locate the file start struct
struct cbfs_file *thisfile =
(struct cbfs_file *)phys_to_virt(current);
// And its length
uint32_t length = ntohl(thisfile->len);
// Locate the file name
char *fname = (char *)(phys_to_virt(current) + sizeof(struct cbfs_file));
// It's not the file we are looking for..
if (strcmp(fname, payloadname) != 0)
{
current =
ALIGN(current + ntohl(thisfile->len) +
ntohl(thisfile->offset), align);
continue;
}
// Else, it's our file.
LOG("Found file %.30s at 0x%x, type %.12s, size %d\n", fname,
current - phys_start, strfiletype(ntohl(thisfile->type)),
length);
// If we are not dumping to stdout, open the out file.
outfile = fopen(outpath, "wb");
if (!outfile)
{
ERROR("Could not open the file %s for writing.\n", outpath);
return 1;
}
if (ntohl(thisfile->type) != CBFS_COMPONENT_RAW)
{
WARN("Only 'raw' files are safe to extract.\n");
}
fwrite(((char *)thisfile)
+ ntohl(thisfile->offset), length, 1, outfile);
fclose(outfile);
LOG("Successfully dumped the file.\n");
// We'll only dump one file.
return 0;
}
ERROR("File %s not found.\n", payloadname);
return 1;
}
int add_file_to_cbfs(void *content, uint32_t contentsize, uint32_t location)
{
uint32_t current = phys_start;
while (current < phys_end) {
if (!cbfs_file_header(current)) {
current += align;
continue;
}
struct cbfs_file *thisfile =
(struct cbfs_file *)phys_to_virt(current);
uint32_t length = ntohl(thisfile->len);
DEBUG("at %x, %x bytes\n", current, length);
/* Is this a free chunk? */
if ((thisfile->type == CBFS_COMPONENT_DELETED)
|| (thisfile->type == CBFS_COMPONENT_NULL)) {
DEBUG("null||deleted at %x, %x bytes\n", current,
length);
/* if this is the right size, and if specified, the right location, use it */
if ((contentsize <= length)
&& ((location == 0) || (current == location))) {
if (contentsize < length) {
DEBUG("this chunk is %x bytes, we need %x. create a new chunk at %x with %x bytes\n",
length, contentsize,
ALIGN(current + contentsize,
align),
length - contentsize);
uint32_t start =
ALIGN(current + contentsize, align);
uint32_t size =
current + ntohl(thisfile->offset)
+ length - start - 16 -
sizeof(struct cbfs_file);
cbfs_create_empty_file(start, size);
}
DEBUG("copying data\n");
memcpy(phys_to_virt(current), content,
contentsize);
return 0;
}
if (location != 0) {
/* CBFS has the constraint that the chain always moves up in memory. so once
we're past the place we seek, we don't need to look any further */
if (current > location) {
ERROR("The requested space is not available\n");
return 1;
}
/* Is the requested location inside the current chunk? */
if ((current < location)
&& ((location + contentsize) <=
(current + length))) {
/* Split it up. In the next iteration the code will be at the right place. */
DEBUG("split up. new length: %x\n",
location - current -
ntohl(thisfile->offset));
thisfile->len =
htonl(location - current -
ntohl(thisfile->offset));
cbfs_create_empty_file(location,
length -
(location -
current));
}
}
}
current =
ALIGN(current + ntohl(thisfile->len) +
ntohl(thisfile->offset), align);
}
ERROR("Could not add the file to CBFS, it's probably too big.\n");
ERROR("File size: %d bytes (%d KB).\n", contentsize, contentsize/1024);
return 1;
}
static struct cbfs_file *merge_adjacent_files(struct cbfs_file *first,
struct cbfs_file *second)
{
uint32_t new_length =
ntohl(first->len) + ntohl(second->len) + ntohl(second->offset);
first->len = htonl(new_length);
first->checksum = 0; // FIXME?
return first;
}
static struct cbfs_file *next_file(struct cbfs_file *prev)
{
uint32_t pos = (prev == NULL) ? phys_start :
ALIGN(virt_to_phys(prev) + ntohl(prev->len) + ntohl(prev->offset),
align);
for (; pos < phys_end; pos += align) {
if (cbfs_file_header(pos))
return (struct cbfs_file *)phys_to_virt(pos);
}
return NULL;
}
int remove_file_from_cbfs(const char *filename)
{
struct cbfs_file *prev = NULL;
struct cbfs_file *cur = next_file(prev);
struct cbfs_file *next = next_file(cur);
for (; cur; prev = cur, cur = next, next = next_file(next)) {
/* Check if this is the file to remove. */
char *name = (char *)cur + sizeof(*cur);
if (strcmp(name, filename))
continue;
/* Mark the file as free space and erase its name. */
cur->type = CBFS_COMPONENT_NULL;
name[0] = '\0';
/* Merge it with the previous file if possible. */
if (prev && prev->type == CBFS_COMPONENT_NULL)
cur = merge_adjacent_files(prev, cur);
/* Merge it with the next file if possible. */
if (next && next->type == CBFS_COMPONENT_NULL)
merge_adjacent_files(cur, next);
return 0;
}
ERROR("CBFS file %s not found.\n", filename);
return 1;
}
/* returns new data block with cbfs_file header, suitable to dump into the ROM. location returns
the new location that points to the cbfs_file header */
void *create_cbfs_file(const char *filename, void *data, uint32_t * datasize,
uint32_t type, uint32_t * location)
{
uint32_t filename_len = ALIGN(strlen(filename) + 1, 16);
uint32_t headersize = sizeof(struct cbfs_file) + filename_len;
if ((location != 0) && (*location != 0)) {
uint32_t offset = *location % align;
/* If offset >= (headersize % align), we can stuff the header into the offset.
Otherwise the header has to be aligned itself, and put before the offset data */
if (offset >= (headersize % align)) {
offset -= (headersize % align);
} else {
offset += align - (headersize % align);
}
headersize += offset;
*location -= headersize;
}
void *newdata = malloc(*datasize + headersize);
if (!newdata) {
ERROR("Could not get %d bytes for CBFS file.\n", *datasize +
headersize);
exit(1);
}
memset(newdata, 0xff, *datasize + headersize);
struct cbfs_file *nextfile = (struct cbfs_file *)newdata;
memcpy((char *)(nextfile->magic), "LARCHIVE", 8);
nextfile->len = htonl(*datasize);
nextfile->type = htonl(type);
nextfile->checksum = 0; // FIXME?
nextfile->offset = htonl(headersize);
strcpy(newdata + sizeof(struct cbfs_file), filename);
memcpy(newdata + headersize, data, *datasize);
*datasize += headersize;
return newdata;
}
int create_cbfs_image(const char *romfile, uint32_t _romsize,
const char *bootblock, uint32_t create_align, uint32_t offs)
{
uint32_t bootblocksize = 0;
struct cbfs_header *master_header;
unsigned char *romarea, *bootblk;
romsize = _romsize;
romarea = malloc(romsize);
if (!romarea) {
ERROR("Could not get %d bytes of memory"
" for CBFS image.\n", romsize);
exit(1);
}
memset(romarea, 0xff, romsize);
if (create_align == 0)
create_align = 64;
bootblk = loadfile(bootblock, &bootblocksize,
romarea + romsize, SEEK_END);
if (!bootblk) {
ERROR("Could not load bootblock %s.\n",
bootblock);
free(romarea);
return 1;
}
// TODO(hungte) Replace magic numbers by named constants.
switch (arch) {
case CBFS_ARCHITECTURE_ARMV7:
/* Set up physical/virtual mapping */
cbfstool_offset = romarea;
/*
* The initial jump instruction and bootblock will be placed
* before and after the master header, respectively. The
* bootblock image must contain a blank, aligned region large
* enough for the master header to fit.
*
* An anchor string must be left such that when cbfstool is run
* we can find it and insert the master header at the next
* aligned boundary.
*/
loadfile(bootblock, &bootblocksize, romarea + offs, SEEK_SET);
unsigned char *p = romarea + offs;
while (1) {
/* FIXME: assumes little endian... */
if (*(uint32_t *)p == 0xdeadbeef)
break;
if (p >= (romarea + _romsize)) {
ERROR("Could not determine CBFS "
"header location.\n");
return 1;
}
p += (sizeof(unsigned int));
}
unsigned int u = ALIGN((unsigned int)(p - romarea), align);
master_header = (struct cbfs_header *)(romarea + u);
master_header->magic = ntohl(CBFS_HEADER_MAGIC);
master_header->version = ntohl(CBFS_HEADER_VERSION);
master_header->romsize = htonl(romsize);
master_header->bootblocksize = htonl(bootblocksize);
master_header->align = htonl(align);
master_header->offset = htonl(
ALIGN((0x40 + bootblocksize), align));
master_header->architecture = htonl(CBFS_ARCHITECTURE_ARMV7);
((uint32_t *) phys_to_virt(0x4 + offs))[0] =
virt_to_phys(master_header);
recalculate_rom_geometry(romarea);
cbfs_create_empty_file(
offs + ALIGN((0x40 + bootblocksize), align),
romsize - offs - sizeof(struct cbfs_file) -
ALIGN((bootblocksize + 0x40), align));
break;
case CBFS_ARCHITECTURE_X86:
// Set up physical/virtual mapping
cbfstool_offset = romarea + romsize - 0x100000000ULL;
loadfile(bootblock, &bootblocksize, romarea + romsize,
SEEK_END);
master_header = (struct cbfs_header *)(romarea + romsize -
bootblocksize - sizeof(struct cbfs_header));
master_header->magic = ntohl(CBFS_HEADER_MAGIC);
master_header->version = ntohl(CBFS_HEADER_VERSION);
master_header->romsize = htonl(romsize);
master_header->bootblocksize = htonl(bootblocksize);
master_header->align = htonl(align);
master_header->offset = htonl(offs);
master_header->architecture = htonl(CBFS_ARCHITECTURE_X86);
((uint32_t *) phys_to_virt(CBFS_HEADPTR_ADDR_X86))[0] =
virt_to_phys(master_header);
recalculate_rom_geometry(romarea);
cbfs_create_empty_file((0 - romsize + offs) & 0xffffffff,
romsize - offs - bootblocksize -
sizeof(struct cbfs_header) -
sizeof(struct cbfs_file) - 16);
break;
default:
// Should not happen.
ERROR("You found a bug in cbfstool.\n");
exit(1);
}
writerom(romfile, romarea, romsize);
free(romarea);
return 0;
}
static int in_segment(int addr, int size, int gran)
{
return ((addr & ~(gran - 1)) == ((addr + size) & ~(gran - 1)));
}
uint32_t cbfs_find_location(const char *romfile, uint32_t filesize,
const char *filename, uint32_t alignment)
{
void *rom;
size_t filename_size, headersize, totalsize;
int ret = 0;
uint32_t current;
rom = loadrom(romfile);
if (rom == NULL) {
ERROR("Could not load ROM image '%s'.\n", romfile);
return 0;
}
filename_size = strlen(filename);
headersize = sizeof(struct cbfs_file) + ALIGN(filename_size + 1, 16) +
sizeof(struct cbfs_stage);
totalsize = headersize + filesize;
current = phys_start;
while (current < phys_end) {
uint32_t top;
struct cbfs_file *thisfile;
if (!cbfs_file_header(current)) {
current += align;
continue;
}
thisfile = (struct cbfs_file *)phys_to_virt(current);
top = current + ntohl(thisfile->len) + ntohl(thisfile->offset);
if (((ntohl(thisfile->type) == 0x0)
|| (ntohl(thisfile->type) == 0xffffffff))
&& (ntohl(thisfile->len) + ntohl(thisfile->offset) >=
totalsize)) {
if (in_segment
(current + headersize, filesize, alignment)) {
ret = current + headersize;
break;
}
if ((ALIGN(current, alignment) + filesize < top)
&& (ALIGN(current, alignment) - headersize >
current)
&& in_segment(ALIGN(current, alignment), filesize,
alignment)) {
ret = ALIGN(current, alignment);
break;
}
if ((ALIGN(current, alignment) + alignment + filesize <
top)
&& (ALIGN(current, alignment) + alignment -
headersize > current)
&& in_segment(ALIGN(current, alignment) + alignment,
filesize, alignment)) {
ret = ALIGN(current, alignment) + alignment;
break;
}
}
current =
ALIGN(current + ntohl(thisfile->len) +
ntohl(thisfile->offset), align);
}
free(rom);
return ret;
}
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