diff --git a/tools/apriori/source.h b/tools/apriori/source.h
new file mode 100644
index 0000000..a5d96bd
--- /dev/null
+++ b/tools/apriori/source.h
@@ -0,0 +1,121 @@
+#ifndef SOURCE_H
+#define SOURCE_H
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <libelf.h>
+#include <libebl.h>
+#ifdef ARM_SPECIFIC_HACKS
+    #include <libebl_arm.h>
+#endif/*ARM_SPECIFIC_HACKS*/
+#include <elf.h>
+#include <gelf.h>
+#include <rangesort.h>
+#include <elfcopy.h>
+
+typedef struct source_t source_t;
+
+typedef struct {
+    Elf_Scn *scn;
+    GElf_Shdr shdr;
+    Elf_Data *data;
+    shdr_info_t *info;
+} section_info_t;
+
+typedef struct {
+    GElf_Rel *rels;
+    int num_rels; /* number of relocations that were not finished */
+    int rels_size; /* this is the size of rels[], NOT the number of rels! */
+} unfinished_relocation_t;
+
+typedef struct {
+    int processed;
+    size_t idx; /* index of DT entry in the .dynamic section, if entry has a ptr value */
+    Elf64_Addr addr; /* if DT entry's value is an address, we save it here */
+    size_t sz_idx; /* index of DT entry in the .dynamic section, if entry has a size value */
+    Elf64_Xword size; /* if DT entry's value is a size, we save it here */
+
+    range_list_t *sections; /* list of sections corresponding to this entry */
+    int num_unfinished_relocs; /* this variables is populated by adjust_dynamic_segment_for()
+                                  during the second pass of the prelinker */
+} dt_rel_info_t;
+
+struct source_t {
+    source_t *next;
+
+    char *name;  /* full path name of this executable file */
+    char *output; /* name of the output file or directory */
+    int output_is_dir; /* nonzero if output is a directory, 0 if output is a file */
+    /* ELF-related information: */
+    Elf *oldelf;
+    Elf *elf;
+    /* info[] is an array of structures describing the sections of the new ELF
+       file.  We populate the info[] array in clone_elf(), and use it to
+       adjust the size of the ELF file when we modify the relocation-entry
+       section.
+    */
+    shdr_info_t *shdr_info;
+    GElf_Ehdr old_ehdr_mem; /* store ELF header of original library */
+    GElf_Ehdr ehdr_mem; /* store ELF header of new library */
+    GElf_Phdr *phdr_info;
+    Ebl *ebl;
+    Elf_Data *shstrtab_data;
+    int elf_fd;
+    int newelf_fd; /* fd of output file, -1 if output == NULL */
+	struct stat elf_file_info;
+    GElf_Ehdr elf_hdr, oldelf_hdr;
+    size_t shstrndx;
+    int shnum; /* number of sections */
+    int dry_run; /* 0 if we do not update the files, 1 (default) otherwise */
+
+    section_info_t symtab;
+    section_info_t strtab;
+    section_info_t dynamic;
+    section_info_t hash;
+    section_info_t bss;
+
+    range_list_t *sorted_sections;
+
+    section_info_t *relocation_sections; /* relocation sections in file */
+    int num_relocation_sections; /* number of relocation sections (<= relocation_sections_size) */
+    int relocation_sections_size; /* sice of array -- NOT number of relocs! */
+
+    /* relocation sections that contain relocations that could not be handled.
+       This array is parallel to relocation_sections, and for each entry
+       in that array, it contains a list of relocations that could not be
+       handled.
+    */
+    unfinished_relocation_t *unfinished;
+
+    /* The sections field of these two structuer contains a list of elements
+       of the member variable relocations. */
+    dt_rel_info_t rel;
+    dt_rel_info_t jmprel;
+
+    int num_syms; /* number of symbols in symbol table.  This is the length of
+                     both exports[] and satisfied[] arrays. */
+
+    /* This is an array that contains one element for each library dependency
+       listed in the executable or shared library. */
+    source_t **lib_deps; /* list of library dependencies */
+    int num_lib_deps; /* actual number of library dependencies */
+    int lib_deps_size; /* size of lib_deps array--NOT actual number of deps! */
+
+    /* This is zero for executables.  For shared libraries, it is the address
+	   at which the library was prelinked. */
+    unsigned base;
+#ifdef SUPPORT_ANDROID_PRELINK_TAGS
+	/* When we read in a file, if it has the prelinked tag, we set prelinked
+	   to 1 and the prelink address in the tag to prelink_base.  This address
+	   must match the value of base that we choose. */
+	int prelinked;
+	long prelink_base; /* valid if prelinked != 0 */
+#endif/*SUPPORT_ANDROID_PRELINK_TAGS*/
+};
+
+extern void find_section(source_t *source, Elf64_Addr address,
+                         Elf_Scn **scn,
+                         GElf_Shdr *shdr,
+                         Elf_Data **data);
+
+#endif/*SOURCE_H*/