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libbdiff user documentation

Headers

To use libbdiff, you only need to include a single header file:

#include <libbdiff.h>

If libbdiff.h isn't in a system headers directory, make sure to use a relative include instead.

Functions

Diffing and patching binaries with libbdiff only requires you to interact with two functions:

int lbd_diff(const char *oldf, const char *newf, const char *patchf)

Creates a binary diff file of name patchf from oldf and newf. Both oldf and newf must exist on the filesystem. Any extant file patchf will be overwritten.

Return

On success, lbd_diff returns LBD_OK. On failure, lbd_diff returns one of the error codes below.

int lbd_patch(const char *oldf, const char *patchf, const char *newf)

Creates a new, patched file of name newf from oldf and patchf. Both oldf and patchf must exist on the filesystem. Any extant file newf will be overwritten.

Return

On success, lbd_patch returns LBD_OK. On failure, lbd_patch returns one of the error codes below.

Error codes

libbdiff defines the following error and status codes:

  • LBD_OK - An 'okay' status. Functions that return LBD_OK did not experience an error.
  • LBD_ERR_OPEN - An error occurred while opening a file for reading or writing. Make sure that any file argument(s) have the proper permissions and exist.
  • LBD_ERR_CLOSE - An error occurred while closing a file. Diffing large binaries on a resource-constrained system may cause this.
  • LBD_ERR_SEEK - A file seek error occurred.
  • LBD_ERR_TELL - A file tell error occurred.
  • LBD_ERR_READ - A file read error occurred.
  • LBD_ERR_WRITE - A file write error occurred.
  • LBD_ERR_CORRUPT - lbd_patch only. The provided patch file is corrupted or lacks a header.
  • LBD_ERR_BZ - A libbzip2 error occurred.