100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/*******************************************************************************
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* Ledger Blue - Bitcoin Wallet
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* (c) 2016 Ledger
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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********************************************************************************/
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#include "btchip_internal.h"
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#define SCRATCH_SIZE 21
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unsigned char
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btchip_convert_hex_amount_to_displayable(unsigned char WIDE *amount) {
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unsigned char LOOP1;
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unsigned char LOOP2;
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if (!(G_coin_config->flags & FLAG_PEERCOIN_UNITS)) {
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LOOP1 = 13;
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LOOP2 = 8;
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} else {
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LOOP1 = 15;
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LOOP2 = 6;
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}
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unsigned short scratch[SCRATCH_SIZE];
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unsigned char offset = 0;
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unsigned char nonZero = 0;
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unsigned char i;
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unsigned char targetOffset = 0;
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unsigned char workOffset;
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unsigned char j;
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unsigned char nscratch = SCRATCH_SIZE;
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unsigned char smin = nscratch - 2;
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unsigned char comma = 0;
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for (i = 0; i < SCRATCH_SIZE; i++) {
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scratch[i] = 0;
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}
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 8; j++) {
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unsigned char k;
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unsigned short shifted_in =
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(((amount[i] & 0xff) & ((1 << (7 - j)))) != 0) ? (short)1
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: (short)0;
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for (k = smin; k < nscratch; k++) {
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scratch[k] += ((scratch[k] >= 5) ? 3 : 0);
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}
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if (scratch[smin] >= 8) {
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smin -= 1;
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}
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for (k = smin; k < nscratch - 1; k++) {
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scratch[k] =
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((scratch[k] << 1) & 0xF) | ((scratch[k + 1] >= 8) ? 1 : 0);
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}
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scratch[nscratch - 1] = ((scratch[nscratch - 1] << 1) & 0x0F) |
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(shifted_in == 1 ? 1 : 0);
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}
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}
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for (i = 0; i < LOOP1; i++) {
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if (!nonZero && (scratch[offset] == 0)) {
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offset++;
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} else {
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nonZero = 1;
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btchip_context_D.tmp[targetOffset++] = scratch[offset++] + '0';
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}
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}
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if (targetOffset == 0) {
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btchip_context_D.tmp[targetOffset++] = '0';
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}
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workOffset = offset;
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for (i = 0; i < LOOP2; i++) {
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unsigned char allZero = 1;
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unsigned char j;
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for (j = i; j < LOOP2; j++) {
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if (scratch[workOffset + j] != 0) {
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allZero = 0;
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break;
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}
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}
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if (allZero) {
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break;
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}
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if (!comma) {
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btchip_context_D.tmp[targetOffset++] = '.';
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comma = 1;
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}
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btchip_context_D.tmp[targetOffset++] = scratch[offset++] + '0';
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}
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return targetOffset;
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}
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