Add "cbfstool extract" function.

[coreboot.git] / util / cbfstool / common.c

diff --git a/util/cbfstool/common.c b/util/cbfstool/common.c
index 8478c5a492cc69005dc6acdc593db6fc9f4609ef..a42585b7761b6e7f107ba395baccd86ed354be47 100644 (file)
--- a/util/cbfstool/common.c
+++ b/util/cbfstool/common.c
@@ -207,6 +207,69 @@ void print_cbfs_directory(const char *filename)
        }
 }
 
+int extract_file_from_cbfs(const char *filename, const char *payloadname, const char *outpath)
+{
+       // Identify the coreboot image.
+       printf(
+            "%s: %d kB, bootblocksize %d, romsize %d, offset 0x%x\nAlignment: %d bytes\n\n",
+            basename((char *)filename), romsize / 1024, ntohl(master_header->bootblocksize),
+            romsize, ntohl(master_header->offset), align);
+
+       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.
+               printf("Found %.30s payload 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)
+               {
+                       printf("Could not open the file %s for writing. Aborting.\n", outpath);
+                       return 1;
+               }
+
+               if (ntohl(thisfile->type) != CBFS_COMPONENT_RAW)
+               {
+                       printf("Warning: only 'raw' files are safe to extract.\n");
+               }
+
+               fwrite(((char *)thisfile)
+                               + ntohl(thisfile->offset), length, 1, outfile);
+
+               fclose(outfile);
+               printf("Successfully dumped the payload.\n");
+
+               // We'll only dump one file.
+               return 0;
+       }
+
+}
+
+
 int add_file_to_cbfs(void *content, uint32_t contentsize, uint32_t location)
 {
        uint32_t current = phys_start;