233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/*
|
|
* This file is part of the libpayload project.
|
|
*
|
|
* Copyright (C) 2011 secunet Security Networks AG
|
|
* Copyright (C) 2013 Google, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/* The CBFS core requires a couple of #defines or functions to adapt it to the
|
|
* target environment:
|
|
*
|
|
* CBFS_CORE_WITH_LZMA (must be #define)
|
|
* if defined, ulzma() must exist for decompression of data streams
|
|
*
|
|
* ERROR(x...)
|
|
* print an error message x (in printf format)
|
|
*
|
|
* LOG(x...)
|
|
* print a message x (in printf format)
|
|
*
|
|
* DEBUG(x...)
|
|
* print a debug message x (in printf format)
|
|
*
|
|
*/
|
|
|
|
#include <cbfs.h>
|
|
#include <string.h>
|
|
|
|
/* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS
|
|
* on failure */
|
|
const struct cbfs_header *cbfs_get_header(struct cbfs_media *media)
|
|
{
|
|
int32_t rel_offset;
|
|
const struct cbfs_header *header;
|
|
struct cbfs_media default_media;
|
|
|
|
if (media == CBFS_DEFAULT_MEDIA) {
|
|
media = &default_media;
|
|
if (init_default_cbfs_media(media) != 0) {
|
|
ERROR("Failed to initialize default media.\n");
|
|
return CBFS_HEADER_INVALID_ADDRESS;
|
|
}
|
|
}
|
|
media->open(media);
|
|
|
|
if (!media->read(media, &rel_offset, (size_t)(0 - sizeof(int32_t)),
|
|
sizeof(int32_t))) {
|
|
ERROR("Could not read CBFS master header offset!\n");
|
|
return CBFS_HEADER_INVALID_ADDRESS;
|
|
}
|
|
header = media->map(media, (size_t)rel_offset, sizeof(*header));
|
|
DEBUG("CBFS header at %#zx (-%#zx from end of image).\n",
|
|
(size_t)rel_offset, (size_t)-rel_offset);
|
|
media->close(media);
|
|
|
|
if (header == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
|
|
ERROR("Failed to load CBFS header from %#zx(-%#zx)\n",
|
|
(size_t)rel_offset, (size_t)-rel_offset);
|
|
return CBFS_HEADER_INVALID_ADDRESS;
|
|
}
|
|
|
|
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
|
|
ERROR("Could not find valid CBFS master header at %#zx(-%#zx): "
|
|
"magic %#.8x vs %#.8x.\n", (size_t)rel_offset,
|
|
(size_t)-rel_offset, CBFS_HEADER_MAGIC,
|
|
ntohl(header->magic));
|
|
if (header->magic == 0xffffffff) {
|
|
ERROR("Maybe ROM is not mapped properly?\n");
|
|
}
|
|
return CBFS_HEADER_INVALID_ADDRESS;
|
|
}
|
|
return header;
|
|
}
|
|
|
|
/* public API starts here*/
|
|
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
|
|
{
|
|
const char *file_name;
|
|
uint32_t offset, romsize, name_len;
|
|
const struct cbfs_header *header;
|
|
struct cbfs_file file, *file_ptr;
|
|
struct cbfs_media default_media;
|
|
|
|
if (media == CBFS_DEFAULT_MEDIA) {
|
|
media = &default_media;
|
|
if (init_default_cbfs_media(media) != 0) {
|
|
ERROR("Failed to initialize default media.\n");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (CBFS_HEADER_INVALID_ADDRESS == (header = cbfs_get_header(media)))
|
|
return NULL;
|
|
|
|
// Logical offset (for source media) of first file.
|
|
offset = ntohl(header->offset);
|
|
romsize = ntohl(header->romsize);
|
|
|
|
// TODO Add a "size" in CBFS header for a platform independent way to
|
|
// determine the end of CBFS data.
|
|
#if IS_ENABLED(CONFIG_LP_ARCH_X86)
|
|
// resolve actual length of ROM used for CBFS components
|
|
// the bootblock size was not taken into account
|
|
romsize -= ntohl(header->bootblocksize);
|
|
|
|
// fine tune the length to handle alignment positioning.
|
|
// using (bootblock size) % align, to derive the
|
|
// number of bytes the bootblock is off from the alignment size.
|
|
if ((ntohl(header->bootblocksize) % CBFS_ALIGNMENT))
|
|
romsize -= (CBFS_ALIGNMENT -
|
|
(ntohl(header->bootblocksize) % CBFS_ALIGNMENT));
|
|
else
|
|
romsize -= 1;
|
|
#endif
|
|
|
|
DEBUG("CBFS location: 0x%x~0x%x\n", offset, romsize);
|
|
DEBUG("Looking for '%s' starting from 0x%x.\n", name, offset);
|
|
|
|
media->open(media);
|
|
while (offset < romsize &&
|
|
media->read(media, &file, offset, sizeof(file)) == sizeof(file)) {
|
|
if (memcmp(CBFS_FILE_MAGIC, file.magic,
|
|
sizeof(file.magic)) != 0) {
|
|
uint32_t new_align = CBFS_ALIGNMENT;
|
|
if (offset % CBFS_ALIGNMENT)
|
|
new_align += CBFS_ALIGNMENT -
|
|
(offset % CBFS_ALIGNMENT);
|
|
ERROR("ERROR: No file header found at 0x%xx - "
|
|
"try next aligned address: 0x%x.\n", offset,
|
|
offset + new_align);
|
|
offset += new_align;
|
|
continue;
|
|
}
|
|
name_len = ntohl(file.offset) - sizeof(file);
|
|
DEBUG(" - load entry 0x%x file name (%d bytes)...\n", offset,
|
|
name_len);
|
|
|
|
// load file name (arbitrary length).
|
|
file_name = (const char*)media->map(
|
|
media, offset + sizeof(file), name_len);
|
|
if (file_name == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
|
|
ERROR("ERROR: Failed to get filename: 0x%x.\n", offset);
|
|
} else if (strcmp(file_name, name) == 0) {
|
|
int file_offset = ntohl(file.offset),
|
|
file_len = ntohl(file.len);
|
|
DEBUG("Found file (offset=0x%x, len=%d).\n",
|
|
offset + file_offset, file_len);
|
|
media->unmap(media, file_name);
|
|
file_ptr = media->map(media, offset,
|
|
file_offset + file_len);
|
|
media->close(media);
|
|
return file_ptr;
|
|
} else {
|
|
DEBUG(" (unmatched file @0x%x: %s)\n", offset,
|
|
file_name);
|
|
media->unmap(media, file_name);
|
|
}
|
|
|
|
// Move to next file.
|
|
offset += ntohl(file.len) + ntohl(file.offset);
|
|
if (offset % CBFS_ALIGNMENT)
|
|
offset += CBFS_ALIGNMENT - (offset % CBFS_ALIGNMENT);
|
|
}
|
|
media->close(media);
|
|
LOG("WARNING: '%s' not found.\n", name);
|
|
return NULL;
|
|
}
|
|
|
|
void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
|
|
int type, size_t *sz)
|
|
{
|
|
struct cbfs_file *file = cbfs_get_file(media, name);
|
|
|
|
if (sz)
|
|
*sz = 0;
|
|
|
|
if (file == NULL) {
|
|
ERROR("Could not find file '%s'.\n", name);
|
|
return NULL;
|
|
}
|
|
|
|
if (ntohl(file->type) != type) {
|
|
ERROR("File '%s' is of type %x, but we requested %x.\n", name,
|
|
ntohl(file->type), type);
|
|
return NULL;
|
|
}
|
|
|
|
if (sz)
|
|
*sz = ntohl(file->len);
|
|
|
|
return (void *)CBFS_SUBHEADER(file);
|
|
}
|
|
|
|
int cbfs_decompress(int algo, void *src, void *dst, int len)
|
|
{
|
|
switch (algo) {
|
|
case CBFS_COMPRESS_NONE:
|
|
memcpy(dst, src, len);
|
|
return len;
|
|
#ifdef CBFS_CORE_WITH_LZMA
|
|
case CBFS_COMPRESS_LZMA:
|
|
return ulzma(src, dst);
|
|
#endif
|
|
default:
|
|
ERROR("tried to decompress %d bytes with algorithm #%x,"
|
|
"but that algorithm id is unsupported.\n", len,
|
|
algo);
|
|
return 0;
|
|
}
|
|
}
|