修改 ah fw 在fw img 之后读取附加的oem数据

pib/src/iot_oem.c

@@ -31,6 +31,7 @@ Information is free from patent or copyright infringement.
 #include "iot_uart_api.h"
 #include "iot_crc_api.h"
 #include "iot_crypto_dsa_api.h"
+#include "iot_string.h"
 
 /**
  * user type for iot
@@ -110,14 +111,25 @@ uint32_t iot_oem_read_mtd(uint8_t *buf, uint32_t size, uint32_t offset)
 
 
 // 抓取额外的差分oem数据
-uint32_t iot_oem_read_mtd_ext(uint8_t *buff,size_t buff_size)
+uint32_t iot_oem_read_mtd_ext(uint8_t *buff,uint32_t buff_size)
 {
-    int fd;
-    int ret;
+    int fd = 0;
     int offset;
     int status;
-    int fw_prtition=PART_NUM_FW1;
+    int fw_size;
+    uint32_t ret = ERR_FAIL;
+    uint8_t fw_prtition = PART_NUM_FW1;
+    char str_buff[10]={0};
+    const char *oem_ext_magic_str = IOT_OEM_EXT_MAGIC_STR;
+    int oem_ext_magic_str_len = strlen(oem_ext_magic_str);
+
     do {
+        status = dev_get_boot_fw_part_num(&fw_prtition);
+        if (status) {
+            break;
+        }
+        fw_size=mtd_get_hdr_img_size(fw_prtition);
+        offset=IOT_OEM_EXT_SECTION_OFFSET(fw_size);
         fd = dev_open(fw_prtition, 0);
         if (fd < 0) {
             fd = 0;
@@ -127,6 +139,17 @@ uint32_t iot_oem_read_mtd_ext(uint8_t *buff,size_t buff_size)
         if (status < 0) {
             break;
         }
+        status = dev_read(fd, buff, oem_ext_magic_str_len);
+        if (status < 0) {
+            break;
+        }
+        if(iot_strcmp(str_buff,oem_ext_magic_str) != 0){
+            break;
+        }
+        status = dev_seek(fd, offset+oem_ext_magic_str_len, DEV_SEEK_SET);
+        if (status < 0) {
+            break;
+        }
         status = dev_read(fd, buff, buff_size);
         if (status < 0) {
             break;
@@ -137,7 +160,6 @@ uint32_t iot_oem_read_mtd_ext(uint8_t *buff,size_t buff_size)
         dev_close(fd);
     }
     return ret;
-
 }