Implement CRC calculation for section

include/patchelfcrc/crc.h

@@ -41,6 +41,8 @@ int crc_len_from_poly(uint64_t polynomial);
 
 void crc_init(struct crc_calc *crc, const struct crc_settings *settings);
 
+void crc_reset(struct crc_calc *crc);
+
 void crc_destroy(struct crc_calc *crc);
 
 void crc_push_byte(struct crc_calc *crc, uint8_t b);

include/patchelfcrc/elfpatch.h

@@ -2,11 +2,30 @@
 #define _ELFPATCH_H_
 
 #include <stdint.h>
+#include <patchelfcrc/crc.h>
+#include <stdbool.h>
 
 typedef struct elfpatch elfpatch_handle_t;
 
+enum granularity {
+    GRANULARITY_BYTE = 8,
+    GRANULARITY_16BIT = 16,
+    GRANULARITY_32BIT = 32,
+};
+
+
 elfpatch_handle_t *elf_patch_open(const char *path);
 
+/**
+ * @brief Check if a section is present in file
+ * @param section Section name
+ * @return 0 if present. Else -1. -1001 in case of pointer error
+ */
+int elf_patch_check_for_section(elfpatch_handle_t *ep, const char *section);
+
+int elf_patch_compute_crc_over_section(elfpatch_handle_t *ep, const char *section, struct crc_calc *crc,
+                                       enum granularity granularity, bool little_endian);
+
 void elf_patch_close_and_free(elfpatch_handle_t *ep);
 
 #endif /* _ELFPATCH_H_ */