61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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#include "fileio.h"
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#include "unpack.h"
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#include "util.h"
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struct unpack_t {
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uint8_t dict_buf[0x200 * 2];
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uint8_t rd[0x1000];
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int size;
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int dict_len;
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};
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static struct unpack_t g_unpack;
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int unpack(const char *filename, uint8_t *dst) {
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const int f = fio_open(filename, 1);
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fio_read(f, g_unpack.rd, 6);
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g_unpack.size = (READ_LE_UINT16(g_unpack.rd) << 16) + READ_LE_UINT16(g_unpack.rd + 2);
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const int dict_len = READ_LE_UINT16(g_unpack.rd + 4);
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print_debug(DBG_UNPACK, "unpack '%s' size %d dict_len %d", filename, g_unpack.size, dict_len);
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fio_read(f, g_unpack.dict_buf, dict_len);
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const uint8_t *src = g_unpack.rd;
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int len = 1;
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int bytes_count = 2;
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uint16_t bits = 0;
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uint16_t val = 0;
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while (1) {
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--len;
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if (len == 0) {
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bytes_count -= 2;
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if (bytes_count == 0) {
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bytes_count = fio_read(f, g_unpack.rd, 0x1000);
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if (bytes_count == 0) {
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break;
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}
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bytes_count += (bytes_count & 1);
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src = g_unpack.rd;
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}
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bits = READ_BE_UINT16(src); src += 2;
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len = 17;
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continue;
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}
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const int carry = (bits & 0x8000) != 0;
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bits <<= 1;
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if (carry) {
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val += 2;
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}
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assert(val < 0x400);
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val = READ_LE_UINT16(g_unpack.dict_buf + val);
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if ((val & 0x8000) == 0) {
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continue;
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}
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*dst++ = val & 255;
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val = 0;
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}
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fio_close(f);
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return g_unpack.size;
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}
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