224 lines
6.6 KiB
C
224 lines
6.6 KiB
C
/* *****************************************************************************
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* decode/std/addin.c -- decode an add-in file.
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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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* addin_set_data:
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* Set handle data.
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*
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* Will take basic add-in data, put it into the right interface format
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* and store it.
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*
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* @arg handle the handle.
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* @arg title the addin title.
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* @arg title_size the addin title size.
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* @arg internal_name the addin internal name.
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* @arg internal_name_size the addin internal name size.
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* @arg version the version string.
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* @arg creation_time the creation time.
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*/
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static void addin_set_data(g1m_t *handle,
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char *title, size_t title_size,
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char *internal_name, size_t internal_name_size,
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char *version, char *creation_time)
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{
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/* useful vars */
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const int two = '0' + '0' * 10;
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const int four = two + '0' * 100 + '0' * 1000;
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/* put title */
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bzero(handle->title, 17);
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strncpy(handle->title, title, title_size);
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/* put internal name */
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bzero(handle->internal_name, 12);
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strncpy(handle->internal_name, internal_name, internal_name_size);
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/* put version */
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#define v version
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handle->version = (g1m_version_t){
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.major = v[0] * 10 + v[1] - two,
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.minor = v[3] * 10 + v[4] - two,
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.revision = v[6] * 1000 + v[7] * 100 + v[8] * 10 + v[9] - four
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};
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#undef v
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/* put time */
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#define c creation_time
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struct tm created = {
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.tm_year = c[0] * 1000 + c[1] * 100 + c[2] * 10 + c[3] - four,
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.tm_mon = c[5] * 10 + c[6] - two,
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.tm_mday = c[7] * 10 + c[8] - two,
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.tm_hour = c[10] * 10 + c[11] - two,
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.tm_min = c[12] * 10 + c[13] - two
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};
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handle->creation_date = mktime(&created);
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#undef c
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}
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/**
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* g1m_decode_std_addin:
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* Decodes a "normal" add-in (after Standard Header).
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*
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* @arg handle the handle.
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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_std_addin(g1m_t *handle, g1m_buffer_t *buffer,
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struct standard_header *std)
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{
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int err = 0;
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(void)std;
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/* get the subheader */
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DREAD(hd, g1a_subheader)
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/* correct subheader endianess */
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hd.filesize = be32toh(hd.filesize);
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/* log info about the subheader */
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log_info("internal name is '%.8s'", hd.internal_name);
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log_info("title is '%.8s'", hd.title);
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log_info("estrips count is %" PRIu8, hd.estrips_count);
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log_info("version is %.10s", hd.version);
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log_info("creation date is %.14s", hd.creation_date);
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/* store data in the handle */
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addin_set_data(handle,
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(char*)hd.title, 8,
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(char*)hd.internal_name, 8,
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(char*)hd.version, (char*)hd.creation_date);
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/* allocate space for icon */
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handle->width = G1A_ICON_WIDTH;
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handle->height = G1A_ICON_HEIGHT;
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handle->pixels = alloc_pixels(G1A_ICON_WIDTH, G1A_ICON_HEIGHT);
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if (!handle->pixels) return (g1m_error_alloc);
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prepare_pixels(handle->pixels, G1A_ICON_WIDTH, G1A_ICON_HEIGHT)
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/* fill icon */
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g1m_decode_picture(handle->pixels, g1m_pictureformat_1bit_packed,
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hd.icon, G1A_ICON_WIDTH, G1A_ICON_HEIGHT);
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/* skip size */
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SKIP(hd.filesize - sizeof(struct standard_header)
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- sizeof(struct g1a_subheader))
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/* no errors */
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return (err);
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}
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/**
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* g1m_decode_std_addin_cg:
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* Decode fx-CG add-in (after Standard Header).
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*
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* @arg handle the handle.
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* @arg buffer the buffer to read from.
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* @arg std the standard header.
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* @return the error code (0 if ok).
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*/
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int g1m_decode_std_addin_cg(g1m_t *handle, g1m_buffer_t *buffer,
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struct standard_header *std)
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{
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int err = 0;
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/* get the subheader */
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DREAD(hd, addin_cp_subheader)
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/* correct subheader endianness */
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hd.checksum = be32toh(hd.checksum);
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hd.control = be32toh(hd.control);
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hd.filesize = be32toh(hd.filesize);
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/* control byte */
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size_t content_size = hd.filesize - 4
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- hd.magic[1] ? 0x7000 : 0x1000;
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if (hd.control != content_size) {
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log_fatal("control value is incorrect!");
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log_fatal("calculated %" PRIuSIZE ", expected %" PRIu32,
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content_size, hd.control);
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return (g1m_error_magic);
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}
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/* start making checksum */
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uint_fast32_t checksum =
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sizeof(struct standard_header) * 256
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- g1m_checksum32(std, sizeof(struct standard_header), 0)
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+ g1m_checksum32(&hd.magic, sizeof(struct addin_cp_subheader), 0);
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/* read subheader */
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if (hd.magic[1]) { /* is Prizm */
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DREAD(shd, g3a_subheader)
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checksum += g1m_checksum32(&shd, sizeof(struct g3a_subheader), 0);
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handle->pixels = alloc_pixels(G3A_ICON_WIDTH, G3A_ICON_HEIGHT);
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handle->width = G3A_ICON_WIDTH; handle->height = G3A_ICON_HEIGHT;
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if (!handle->pixels) return (g1m_error_alloc);
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prepare_pixels(handle->pixels, G3A_ICON_WIDTH, G3A_ICON_HEIGHT)
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g1m_decode_picture(handle->pixels, g1m_pictureformat_16bit,
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shd.unselected_icon_image, G3A_ICON_WIDTH, G3A_ICON_HEIGHT);
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} else { /* is C1A */
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DREAD(shd, c1a_subheader)
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checksum += g1m_checksum32(&shd, sizeof(struct c1a_subheader), 0);
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handle->pixels = alloc_pixels(C1A_ICON_WIDTH, C1A_ICON_HEIGHT);
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handle->width = C1A_ICON_WIDTH; handle->height = C1A_ICON_HEIGHT;
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if (!handle->pixels) return (g1m_error_alloc);
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prepare_pixels(handle->pixels, C1A_ICON_WIDTH, C1A_ICON_HEIGHT);
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g1m_decode_picture(handle->pixels, g1m_pictureformat_1bit_packed,
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shd.icon, C1A_ICON_WIDTH, C1A_ICON_HEIGHT);
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}
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/* skip content for now */
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if ((err = g1m_skip(buffer, content_size, &checksum)))
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goto fail;
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/* check the sum (yo!) */
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err = g1m_error_magic;
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if (checksum != hd.checksum) {
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log_fatal("Invalid checksum!");
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log_fatal("Header checksum is %" PRIu32
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", calculated checksum is %" PRIuFAST32,
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hd.checksum, checksum);
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goto fail;
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}
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/* log */
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log_info("title is '%.16s'", hd.title);
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log_info("internal name is '%.11s'", hd.internal_name);
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log_info("version is '%.10s'", hd.version);
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log_info("timestamp is '%.14s'", hd.stamp);
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/* store basic data in the handle */
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addin_set_data(handle,
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(char*)hd.title, 16,
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(char*)hd.internal_name, 12,
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(char*)hd.version, (char*)hd.stamp);
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/* no error */
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return (0);
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fail:
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free(handle->pixels);
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return (err);
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}
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