/**
* \brief Read a signature from a file into an ::rs_signature_t structure
* in memory.
*
* Once there, it can be used to generate a delta to a newer version of
* the file.
*
* \note After loading the signatures, you must call
* rs_build_hash_table() before you can use them.
*/
rs_job_t *rs_loadsig_begin(rs_signature_t **signature)
{
rs_job_t *job;
job = rs_job_new("loadsig", rs_loadsig_s_magic);
*signature = job->signature = rs_alloc_struct(rs_signature_t);
job->signature->count = 0;
return job;
}
/**
* \brief Apply a \ref gloss_delta to a \ref gloss_basis to recreate
* the new file.
*
* This gives you back a ::rs_job_t object, which can be cranked by
* calling rs_job_iter() and updating the stream pointers. When
* finished, call rs_job_finish() to dispose of it.
*
* \param stream Contains pointers to input and output buffers, to be
* adjusted by caller on each iteration.
*
* \param copy_cb Callback used to retrieve content from the basis
* file.
*
* \param copy_arg Opaque environment pointer passed through to the
* callback.
*
* \todo As output is produced, accumulate the MD4 checksum of the
* output. Then if we find a CHECKSUM command we can check it's
* contents against the output.
*
* \todo Implement COPY commands.
*
* \sa rs_patch_file()
*/
rs_job_t *
rs_patch_begin(rs_copy_cb *copy_cb, void *copy_arg)
{
rs_job_t *job = rs_job_new("patch", rs_patch_s_header);
job->copy_cb = copy_cb;
job->copy_arg = copy_arg;
rs_mdfour_begin(&job->output_md4);
return job;
}
/** \brief Set up a new encoding job.
*
* \sa rs_sig_file()
*/
rs_job_t * rs_sig_begin(size_t new_block_len, size_t strong_sum_len)
{
rs_job_t *job;
job = rs_job_new("signature", rs_sig_s_header);
job->block_len = new_block_len;
assert(strong_sum_len > 0 && strong_sum_len <= RS_MD4_LENGTH);
job->strong_sum_len = strong_sum_len;
return job;
}
/**
* \brief Read a signature from a file into an ::rs_signature_t structure
* in memory.
*
* Once there, it can be used to generate a delta to a newer version of
* the file.
*
* \note After loading the signatures, you must call
* rs_build_hash_table() before you can use them.
*/
rs_job_t *rs_loadsig_begin(rs_signature_t **signature, FILE *old_file)
{
rs_job_t *job;
job = rs_job_new("loadsig", rs_loadsig_s_magic);
*signature = job->signature = rs_alloc_struct(rs_signature_t);
job->signature->count = 0;
(*signature)->old_file = old_file;
/*
FILE *old_file = fopen(old_path, "rb");
fread(buf, 10, 1, old_file);
printf("buf =\n%s\n", buf);
printf("OOOOO\n");
*/
return job;
}
/**
* Prepare to compute a streaming delta.
*/
rs_job_t *rs_delta_begin(rs_signature_t *sig)
{
rs_job_t *job;
job = rs_job_new("delta", rs_delta_s_header);
job->signature = sig;
RollsumInit(&job->weak_sum);
if ((job->block_len = sig->block_len) < 0) {
rs_log(RS_LOG_ERR, "unreasonable block_len %d in signature",
job->block_len);
return NULL;
}
job->strong_sum_len = sig->strong_sum_len;
if (job->strong_sum_len < 0 || job->strong_sum_len > RS_STRONG_SUM_LEN) {
rs_log(RS_LOG_ERR, "unreasonable strong_sum_len %d in signature",
job->strong_sum_len);
return NULL;
}
return job;
}