88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* *****************************************************************************
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* decode/cas/program.c -- decode a CAS 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_cashpart_program:
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* Decode a CAS heads program part.
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*
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* @arg head the general head.
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* @arg heads the heads 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_cashpart_program(g1m_mcshead_t *head, g1m_mcshead_t *heads,
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g1m_buffer_t *buffer)
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{
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/* get content */
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struct cas_spe_program headers[head->count];
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READ(headers, sizeof(struct cas_spe_program) * head->count)
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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(headers,
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sizeof(struct cas_spe_program) * head->count) + 1;
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if (csum != checksum) {
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log_error("Checksum mismatch: expected 0x%02X, got 0x%02X",
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csum, checksum);
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return (g1m_error_checksum);
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}
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/* initialize */
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for (int i = 0; i < head->count; i++) {
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heads[i].size = be16toh(headers[i].length);
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/* program type? */
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}
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/* everything went well :D */
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head->flags &= ~g1m_mcsflag_unfinished;
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return (0);
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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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log_error("Checksum mismatch: expected 0x%02X, got 0x%02X",
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csum, checksum);
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return (g1m_error_checksum);
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}
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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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