mirror of
https://github.com/trezor/trezor-firmware.git
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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "toif.h"
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#include <stddef.h>
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#include <string.h>
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// see docs/misc/toif.md for definition of the TOIF format
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bool toif_header_parse(const uint8_t *data, uint32_t len, uint16_t *out_w,
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uint16_t *out_h, toif_format_t *out_format) {
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if (len < 12 || memcmp(data, "TOI", 3) != 0) {
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return false;
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}
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toif_format_t format = false;
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if (data[3] == 'f') {
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format = TOIF_FULL_COLOR_BE;
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} else if (data[3] == 'g') {
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format = TOIF_GRAYSCALE_OH;
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} else if (data[3] == 'F') {
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format = TOIF_FULL_COLOR_LE;
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} else if (data[3] == 'G') {
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format = TOIF_GRAYSCALE_EH;
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} else {
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return false;
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}
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uint16_t w = *(uint16_t *)(data + 4);
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uint16_t h = *(uint16_t *)(data + 6);
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uint32_t datalen = *(uint32_t *)(data + 8);
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if (datalen != len - 12) {
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return false;
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}
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if (out_w != NULL && out_h != NULL && out_format != NULL) {
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*out_w = w;
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*out_h = h;
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*out_format = format;
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}
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return true;
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}
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