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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include "cards.h"
enum {
MZ_NEOff = 0x3C,
NE_ResTableOff = 0x24,
ResTable_AlignShift = 0x00,
ResTable_ResBlock = 0x02,
ResBlock_TypeID = 0x00,
ResBlock_ResCount = 0x02,
ResBlock_Resource = 0x08,
TypeID_Bitmap = 0x8002,
Resource_Off = 0x00,
Resource_Len = 0x02,
Resource_ID = 0x06,
Resource_Next = 0x0C,
IDMask = 0x7FFF,
BMPHeader_FileLen = 0x02,
BMPHeader_Reserved = 0x06,
BMPHeader_DataOff = 0x0A,
BMPHeader_DIBHeader = 0x0E,
DIBHeader_Len = 0x00,
DIBHeaderCore_Bits = 0x0A,
DIBHeaderCoreLen = 0x0C,
};
static uint16_t read16(const uint8_t *ptr, size_t off) {
return (uint16_t)ptr[off] | (uint16_t)ptr[off + 1] << 8;
}
static uint32_t read32(const uint8_t *ptr, size_t off) {
return (uint32_t)ptr[off]
| (uint32_t)ptr[off + 1] << 8
| (uint32_t)ptr[off + 2] << 16
| (uint32_t)ptr[off + 3] << 24;
}
static void write32(uint8_t *ptr, size_t off, uint32_t val) {
ptr[off + 0] = val & 0xFF;
ptr[off + 1] = val >> 8 & 0xFF;
ptr[off + 2] = val >> 16 & 0xFF;
ptr[off + 3] = val >> 24;
}
int cardsLoad(const uint8_t *ptr, size_t len) {
if (len < MZ_NEOff + 2) return -1;
if (ptr[0] != 'M' || ptr[1] != 'Z') return -1;
uint16_t neOff = read16(ptr, MZ_NEOff);
if (len < neOff + NE_ResTableOff + 2) return -1;
if (ptr[neOff + 0] != 'N' || ptr[neOff + 1] != 'E') return -1;
uint16_t resTableOff = neOff + read16(ptr, neOff + NE_ResTableOff);
if (len < resTableOff + ResTable_ResBlock) return -1;
uint16_t alignShift = read16(ptr, resTableOff + ResTable_AlignShift);
uint16_t resBlockOff = resTableOff + ResTable_ResBlock;
uint16_t resCount;
for (;;) {
if (len < resBlockOff + ResBlock_Resource) return -1;
uint16_t typeID = read16(ptr, resBlockOff + ResBlock_TypeID);
resCount = read16(ptr, resBlockOff + ResBlock_ResCount);
if (!typeID) return -1;
if (typeID == TypeID_Bitmap) break;
resBlockOff += ResBlock_Resource + resCount * Resource_Next;
}
uint16_t resOff = resBlockOff + ResBlock_Resource;
for (uint16_t i = 0; i < resCount; ++i, resOff += Resource_Next) {
if (len < resOff + Resource_Next) return -1;
uint16_t id = read16(ptr, resOff + Resource_ID);
if ((id & IDMask) >= CardsLen) continue;
size_t dataOff = read16(ptr, resOff + Resource_Off);
size_t dataLen = read16(ptr, resOff + Resource_Len);
dataOff <<= alignShift;
dataLen <<= alignShift;
if (len < dataOff + dataLen) return -1;
if (dataLen < DIBHeaderCoreLen) return -1;
uint32_t dibHeaderLen = read32(ptr, dataOff + DIBHeader_Len);
uint32_t bmpFileLen = BMPHeader_DIBHeader + dataLen;
uint32_t bmpDataOff = BMPHeader_DIBHeader + dibHeaderLen;
if (dibHeaderLen == DIBHeaderCoreLen) {
bmpDataOff += 3 * (1 << read16(ptr, dataOff + DIBHeaderCore_Bits));
}
uint8_t *bitmap = malloc(bmpFileLen);
if (!bitmap) return -1;
bitmap[0] = 'B';
bitmap[1] = 'M';
write32(bitmap, BMPHeader_FileLen, bmpFileLen);
write32(bitmap, BMPHeader_Reserved, 0);
write32(bitmap, BMPHeader_DataOff, bmpDataOff);
memcpy(&bitmap[BMPHeader_DIBHeader], &ptr[dataOff], dataLen);
cardsData[id & IDMask].ptr = bitmap;
cardsData[id & IDMask].len = bmpFileLen;
}
return 0;
}
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