88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* *****************************************************************************
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* decode/mcs/program.c -- decode an MCS program.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libg1m.
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* libg1m is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libg1m is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libg1m; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#include <libg1m/internals.h>
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/**
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* g1m_decode_mcs_program:
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* Decode a program.
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*
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* @arg handle the handle to make.
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* @arg buffer the buffer to read from.
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* @arg head the pre-filled head to complete and use.
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* @return the error code (0 if ok).
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*/
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int g1m_decode_mcs_program(g1m_mcsfile_t **handle, g1m_buffer_t *buffer,
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g1m_mcshead_t *head)
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{
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int err;
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/* read header */
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DREAD(hd, mcs_programheader)
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log_info("Program password is '%.8s'.", hd.password);
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/* make final head and file */
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strncpy(head->password, (char*)hd.password, 8);
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head->password[8] = 0;
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head->size -= sizeof(struct mcs_programheader);
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head->size += 1; /* terminating zero - XXX: keep it? */
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err = g1m_make_mcsfile(handle, head);
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if (err) return (err);
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/* get content */
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g1m_mcsfile_t *h = *handle;
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log_info("Getting program content (%" PRIuSIZE "o)", head->size);
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GREAD(h->content, head->size - 1);
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h->content[head->size] = 0;
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/* no error */
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return (0);
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fail:
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g1m_free_mcsfile(*handle);
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*handle = NULL;
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return (err);
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}
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/**
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* g1m_decode_caspart_program:
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* Decode a CAS program part.
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*
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* @arg handle the handle to contribute to.
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* @arg buffer the buffer to read from.
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* @return the error code (0 if ok).
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*/
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int g1m_decode_caspart_program(g1m_mcsfile_t *handle, g1m_buffer_t *buffer)
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{
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/* get content */
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READ(handle->content, handle->head.size)
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log_info("Program content is:");
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logm_info(handle->content, handle->head.size);
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/* check the sum */
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uint8_t checksum; READ(&checksum, 1)
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uint8_t csum = ~g1m_checksum8(handle->content, handle->head.size) + 1;
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if (csum != checksum)
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return (g1m_error_checksum);
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/* everything went well :) */
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handle->head.flags &= ~g1m_mcsflag_unfinished;
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return (0);
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}
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