multiboot: Refactor duplicated functions to a separate file

The implementation of write_bootdata() and get_redirect_dir() was
copied verbatim in two different places, obviously a bad thing for
maintainability. This moves them to a new file multiboot.c as they
are only used for multiboot.

Change-Id: Id0279216e4dd019f8bf612a81d3835eff010e506

1 files changed, 1 insertions, 88 deletions

diff --git a/firmware/target/arm/pp/mi4-loader.c b/firmware/target/arm/pp/mi4-loader.c
index 0104496e9d..f609e3ff7a 100644
--- a/firmware/target/arm/pp/mi4-loader.c
+++ b/firmware/target/arm/pp/mi4-loader.c
@@ -30,96 +30,9 @@
 #include "crc32.h"
 #include "file.h"
 #if defined(HAVE_BOOTDATA)
-#include "system.h"
-#include "bootdata.h"
-
-/* Write bootdata into location in FIRMWARE marked by magic header
- * Assumes buffer is already loaded with the firmware image
- * We just need to find the location and write data into the
- * payload region along with the crc for later verification and use.
- * Returns payload len on success,
- * On error returns EKEY_NOT_FOUND
- */
-int write_bootdata(unsigned char* buf, int len, unsigned int boot_volume)
-{
-    struct boot_data_t bl_boot_data;
-    struct boot_data_t *fw_boot_data = NULL;
-    int search_len = MIN(len, BOOT_DATA_SEARCH_SIZE) - sizeof(struct boot_data_t);
-    int payload_len = EKEY_NOT_FOUND;
-
-    /* search for boot data header prior to search_len */
-    for(int i = 0;i < search_len;i++)
-    {
-        fw_boot_data = (struct boot_data_t*) &buf[i];
-        if (fw_boot_data->magic[0] != BOOT_DATA_MAGIC0 ||
-            fw_boot_data->magic[1] != BOOT_DATA_MAGIC1)
-            continue;
-
-        memset(&bl_boot_data.payload, 0, BOOT_DATA_PAYLOAD_SIZE);
-        bl_boot_data.boot_volume = boot_volume;
-
-        memset(fw_boot_data->payload, 0, fw_boot_data->length);
-        /* determine maximum bytes we can write to firmware
-           BOOT_DATA_PAYLOAD_SIZE is the size the bootloader expects */
-        payload_len = MIN(BOOT_DATA_PAYLOAD_SIZE, fw_boot_data->length);
-        fw_boot_data->length = payload_len;
-        /* copy data to FIRMWARE bootdata struct */
-        memcpy(fw_boot_data->payload, &bl_boot_data.payload, payload_len);
-        /* crc will be used within the firmware to check validity of bootdata */
-        fw_boot_data->crc = crc_32(fw_boot_data->payload, payload_len, 0xffffffff);
-        break;
-
-    }
-    return payload_len;
-}
+#include "multiboot.h"
 #endif /* HAVE_BOOTDATA */
 
-#ifdef HAVE_MULTIBOOT /* defined by config.h */
-/* Check in root of this <volume> for rockbox_main.<playername>
- * if this file empty or there is a single slash '/'
- * buf = '<volume#>/<rootdir>/<firmware(name)>\0'
- * If instead '/<*DIRECTORY*>' is supplied
- * addpath will be set to this DIRECTORY buf =
- * '/<volume#>/addpath/<rootdir>/<firmware(name)>\0'
- * On error returns Negative number or 0
- * On success returns bytes from snprintf
- * and generated path will be placed in buf
- * note: if supplied buffer is too small return will be
- * the number of bytes that would have been written
- */
-int get_redirect_dir(char* buf, int buffer_size, int volume,
-                     const char* rootdir, const char* firmware)
-{
-    int fd;
-    int f_offset;
-    char add_path[MAX_PATH];
-    /* Check in root of volume for rockbox_main.<playername> redirect */
-    snprintf(add_path, sizeof(add_path), "/<%d>/"BOOT_REDIR, volume);
-    fd = open(add_path, O_RDONLY);
-    if (fd < 0)
-        return EFILE_NOT_FOUND;
-
-    /*clear add_path for re-use*/
-    memset(add_path, 0, sizeof(add_path));
-    f_offset = read(fd, add_path,sizeof(add_path));
-    close(fd);
-
-    for(int i = f_offset - 1;i > 0; i--)
-    {
-        /* strip control chars < SPACE or all if path doesn't start with '/' */
-        if (add_path[i] < 0x20 || add_path[0] != '/')
-           add_path[i] = '\0';
-    }
-    /* if '/add_path' is specified in rockbox_main.<playername>
-       path is /<vol#>/add_path/rootdir/firmwarename
-       if add_path is empty or '/' is missing from beginning
-       path is /<vol#>/rootdir/firmwarename
-    */
-    return snprintf(buf, buffer_size, "/<%d>%s/%s/%s", volume, add_path,
-                                                        rootdir, firmware);
-}
-#endif /* HAVE_MULTIBOOT */
-
 static inline unsigned int le2int(unsigned char* buf)
 {
    int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];