| /* |
| * LZ4K Decompressor by Vovo |
| */ |
| #include <linux/lz4k.h> |
| #include <linux/types.h> |
| |
| #define CONFIG_UBIFS_FS |
| static unsigned short lz4k_matchlen_decode[128] = |
| { 780, 1298, 1035, 0, 1033, 1553, 1040, 0, 780, 1304, 1039, 0, 1034, 1567, 1293, 0, 780, 1300, |
| 1035, 0, 1033, 1558, 1040, 0, 780, 1308, 1039, 0, 1034, 1818, 1294, 0, 780, 1298, 1035, 0, 1033, 1555, 1040, 0, 780, 1304, 1039, 0, |
| 1034, 1813, 1293, 0, 780, 1300, 1035, 0, 1033, 1559, 1040, 0, 780, 1308, 1039, 0, 1034, 1821, 1294, 0, |
| 780, 1298, 1035, 0, 1033, 1553, 1040, 0, 780, 1304, 1039, 0, 1034, 1567, 1293, 0, 780, 1300, |
| 1035, 0, 1033, 1558, 1040, 0, 780, 1308, 1039, 0, 1034, 1819, 1294, 0, 780, 1298, 1035, |
| 0, 1033, 1555, 1040, 0, 780, 1304, 1039, 0, 1034, 1817, 1293, 0, 780, 1300, 1035, 0, |
| 1033, 1559, 1040, 0, 780, 1308, 1039, 0, 1034, 1822, 1294, 0, |
| }; |
| |
| #ifdef CONFIG_UBIFS_FS |
| static unsigned short lz4k_matchlen_decode_hc[256] = |
| { 514, 772, 515, 1031, 514, 1029, 515, 1545, 514, 772, 515, 1288, 514, 1030, 515, 2061, 514, |
| 772, 515, 1031, 514, 1029, 515, 1551, 514, 772, 515, 1291, 514, 1030, 515, 0, 514, 772, 515, 1031, 514, 1029, 515, 1548, 514, 772, 515, |
| 1288, 514, 1030, 515, 2067, 514, 772, 515, 1031, 514, 1029, 515, 1802, 514, 772, 515, 1291, 514, 1030, 515, 0, |
| 514, 772, 515, 1031, 514, 1029, 515, 1545, 514, 772, 515, 1288, 514, 1030, 515, 2065, 514, |
| 772, 515, 1031, 514, 1029, 515, 1551, 514, 772, 515, 1291, 514, 1030, 515, 0, 514, 772, |
| 515, 1031, 514, 1029, 515, 1548, 514, 772, 515, 1288, 514, 1030, 515, 2072, 514, 772, |
| 515, 1031, 514, 1029, 515, 1808, 514, 772, 515, 1291, 514, 1030, 515, 0, |
| 514, 772, 515, 1031, 514, 1029, 515, 1545, 514, 772, 515, 1288, 514, 1030, 515, 2062, 514, |
| 772, 515, 1031, 514, 1029, 515, 1551, 514, 772, 515, 1291, 514, 1030, 515, 0, 514, 772, |
| 515, 1031, 514, 1029, 515, 1548, 514, 772, 515, 1288, 514, 1030, 515, 2068, 514, 772, |
| 515, 1031, 514, 1029, 515, 1802, 514, 772, 515, 1291, 514, 1030, 515, 0, |
| 514, 772, 515, 1031, 514, 1029, 515, 1545, 514, 772, 515, 1288, 514, 1030, 515, 2066, 514, |
| 772, 515, 1031, 514, 1029, 515, 1551, 514, 772, 515, 1291, 514, 1030, 515, 0, 514, 772, |
| 515, 1031, 514, 1029, 515, 1548, 514, 772, 515, 1288, 514, 1030, 515, 2076, 514, 772, |
| 515, 1031, 514, 1029, 515, 1808, 514, 772, 515, 1291, 514, 1030, 515, 0, |
| }; |
| #endif /* CONFIG_UBIFS_FS */ |
| |
| static unsigned short lz4k_matchoff_decode[128] = |
| { 1028, 1336, 1040, 1600, 1032, 1568, 1292, 1888, 1028, 1556, 1040, 1852, 1032, 1576, 1304, |
| 2132, 1028, 1336, 1040, 1836, 1032, 1572, 1292, 1912, 1028, 1564, 1040, 1872, 1032, 1584, 1304, 2156, 1028, 1336, 1040, 1600, 1032, |
| 1568, 1292, 1904, 1028, 1556, 1040, 1864, 1032, 1576, 1304, 2148, 1028, 1336, 1040, 1844, 1032, 1572, 1292, 2116, 1028, 1564, 1040, |
| 1880, 1032, 1584, 1304, 2172, |
| 1028, 1336, 1040, 1600, 1032, 1568, 1292, 1888, 1028, 1556, 1040, 1852, 1032, 1576, 1304, |
| 2140, 1028, 1336, 1040, 1836, 1032, 1572, 1292, 1912, 1028, 1564, 1040, 1872, 1032, |
| 1584, 1304, 2164, 1028, 1336, 1040, 1600, 1032, 1568, 1292, 1904, 1028, 1556, 1040, |
| 1864, 1032, 1576, 1304, 2152, 1028, 1336, 1040, 1844, 1032, 1572, 1292, 2124, 1028, |
| 1564, 1040, 1880, 1032, 1584, 1304, 2176, |
| }; |
| |
| #ifdef CONFIG_UBIFS_FS |
| static unsigned short lz4k_matchoff_decode_hc[128] = |
| { 768, 1560, 1284, 1814, 768, 1836, 1296, 1876, 768, 1820, 1288, 1860, 768, 1856, 1548, 2160, |
| 768, 1793, 1284, 1822, 768, 1848, 1296, 2144, 768, 1828, 1288, 1868, 768, 1806, 1556, 2176, 768, 1560, 1284, 1818, 768, 1840, 1296, 2136, |
| 768, 1824, 1288, 1864, 768, 1802, 1548, 2168, 768, 1798, 1284, 1844, 768, 1852, 1296, 2152, 768, 1832, 1288, 1872, 768, 1810, 1556, 2082, |
| 768, 1560, 1284, 1814, 768, 1836, 1296, 1876, 768, 1820, 1288, 1860, 768, 1856, 1548, 2164, |
| 768, 1793, 1284, 1822, 768, 1848, 1296, 2148, 768, 1828, 1288, 1868, 768, 1806, 1556, |
| 2050, 768, 1560, 1284, 1818, 768, 1840, 1296, 2140, 768, 1824, 1288, 1864, 768, 1802, |
| 1548, 2172, 768, 1798, 1284, 1844, 768, 1852, 1296, 2156, 768, 1832, 1288, 1872, 768, |
| 1810, 1556, 2180, |
| }; |
| #endif /* CONFIG_UBIFS_FS */ |
| |
| static unsigned short lz4k_literallen_decode[128] = |
| { 257, 770, 257, 1029, 257, 1027, 257, 1543, 257, 770, 257, 1286, 257, 1028, 257, 1806, 257, |
| 770, 257, 1029, 257, 1027, 257, 1802, 257, 770, 257, 1289, 257, 1028, 257, 0, 257, 770, 257, 1029, 257, 1027, 257, 1544, 257, 770, 257, |
| 1286, 257, 1028, 257, 1808, 257, 770, 257, 1029, 257, 1027, 257, 1804, 257, 770, 257, 1289, 257, 1028, 257, 0, |
| 257, 770, 257, 1029, 257, 1027, 257, 1543, 257, 770, 257, 1286, 257, 1028, 257, 1807, 257, |
| 770, 257, 1029, 257, 1027, 257, 1803, 257, 770, 257, 1289, 257, 1028, 257, 0, 257, 770, |
| 257, 1029, 257, 1027, 257, 1544, 257, 770, 257, 1286, 257, 1028, 257, 1809, 257, 770, |
| 257, 1029, 257, 1027, 257, 1805, 257, 770, 257, 1289, 257, 1028, 257, 0, |
| }; |
| |
| static unsigned short lz4k_literalch_decode[512] = |
| { 1024, 2120, 1840, 2327, 1344, 2224, 2060, 2461, 1279, 2151, 1903, 2411, 1794, 2280, 2082, |
| 2500, 1024, 2132, 1889, 2367, 1537, 2258, 2072, 2479, 1279, 2168, 1920, 2443, 1801, 2292, 2097, 2524, 1024, 2126, 1872, 2358, 1344, |
| 2240, 2065, 2470, 1279, 2161, 1906, 2433, 1796, 2288, 2089, 2509, 1024, 2146, 1897, 2391, 1568, 2264, 2077, 2490, 1279, 2192, 2053, |
| 2452, 1808, 2297, 2104, 2537, |
| 1024, 2124, 1857, 2346, 1344, 2232, 2062, 2466, 1279, 2156, 1904, 2428, 1795, 2285, 2084, |
| 2505, 1024, 2143, 1893, 2377, 1537, 2260, 2075, 2485, 1279, 2180, 2016, 2447, 1802, |
| 2295, 2099, 2530, 1024, 2130, 1873, 2363, 1344, 2256, 2067, 2475, 1279, 2165, 1908, |
| 2438, 1800, 2290, 2094, 2519, 1024, 2148, 1902, 2396, 1568, 2275, 2079, 2495, 1279, |
| 2208, 2055, 2457, 1832, 2300, 2115, 2550, |
| 1024, 2123, 1840, 2342, 1344, 2228, 2061, 2463, 1279, 2152, 1903, 2426, 1794, 2284, 2083, |
| 2502, 1024, 2136, 1889, 2374, 1537, 2259, 2074, 2482, 1279, 2169, 1920, 2445, 1801, |
| 2293, 2098, 2526, 1024, 2127, 1872, 2361, 1344, 2248, 2066, 2473, 1279, 2163, 1906, |
| 2435, 1796, 2289, 2092, 2511, 1024, 2147, 1897, 2394, 1568, 2273, 2078, 2493, 1279, |
| 2200, 2054, 2454, 1808, 2298, 2114, 2539, |
| 1024, 2125, 1857, 2349, 1344, 2236, 2063, 2468, 1279, 2157, 1904, 2430, 1795, 2286, 2085, |
| 2507, 1024, 2144, 1893, 2389, 1537, 2261, 2076, 2487, 1279, 2184, 2016, 2450, 1802, |
| 2296, 2100, 2534, 1024, 2131, 1873, 2365, 1344, 2257, 2068, 2477, 1279, 2166, 1908, |
| 2441, 1800, 2291, 2095, 2522, 1024, 2150, 1902, 2398, 1568, 2277, 2081, 2498, 1279, |
| 2216, 2059, 2459, 1832, 2325, 2116, 2557, |
| 1024, 2120, 1840, 2329, 1344, 2224, 2060, 2462, 1279, 2151, 1903, 2423, 1794, 2280, 2082, |
| 2501, 1024, 2132, 1889, 2373, 1537, 2258, 2072, 2481, 1279, 2168, 1920, 2444, 1801, |
| 2292, 2097, 2525, 1024, 2126, 1872, 2359, 1344, 2240, 2065, 2471, 1279, 2161, 1906, |
| 2434, 1796, 2288, 2089, 2510, 1024, 2146, 1897, 2393, 1568, 2264, 2077, 2491, 1279, |
| 2192, 2053, 2453, 1808, 2297, 2104, 2538, |
| 1024, 2124, 1857, 2347, 1344, 2232, 2062, 2467, 1279, 2156, 1904, 2429, 1795, 2285, 2084, |
| 2506, 1024, 2143, 1893, 2378, 1537, 2260, 2075, 2486, 1279, 2180, 2016, 2449, 1802, |
| 2295, 2099, 2532, 1024, 2130, 1873, 2364, 1344, 2256, 2067, 2476, 1279, 2165, 1908, |
| 2439, 1800, 2290, 2094, 2521, 1024, 2148, 1902, 2397, 1568, 2275, 2079, 2497, 1279, |
| 2208, 2055, 2458, 1832, 2300, 2115, 2555, |
| 1024, 2123, 1840, 2343, 1344, 2228, 2061, 2465, 1279, 2152, 1903, 2427, 1794, 2284, 2083, |
| 2503, 1024, 2136, 1889, 2375, 1537, 2259, 2074, 2483, 1279, 2169, 1920, 2446, 1801, |
| 2293, 2098, 2527, 1024, 2127, 1872, 2362, 1344, 2248, 2066, 2474, 1279, 2163, 1906, |
| 2437, 1796, 2289, 2092, 2518, 1024, 2147, 1897, 2395, 1568, 2273, 2078, 2494, 1279, |
| 2200, 2054, 2455, 1808, 2298, 2114, 2543, |
| 1024, 2125, 1857, 2357, 1344, 2236, 2063, 2469, 1279, 2157, 1904, 2431, 1795, 2286, 2085, |
| 2508, 1024, 2144, 1893, 2390, 1537, 2261, 2076, 2489, 1279, 2184, 2016, 2451, 1802, |
| 2296, 2100, 2535, 1024, 2131, 1873, 2366, 1344, 2257, 2068, 2478, 1279, 2166, 1908, |
| 2442, 1800, 2291, 2095, 2523, 1024, 2150, 1902, 2410, 1568, 2277, 2081, 2499, 1279, |
| 2216, 2059, 2460, 1832, 2326, 2116, 2558, |
| }; |
| |
| #define RESERVE_16_BITS() \ |
| if (remaining_bits <= 16) { \ |
| bits_buffer32 = bits_buffer32 | (*((unsigned short *)ip)) << remaining_bits; \ |
| ip += 2; \ |
| remaining_bits += 16; \ |
| } |
| |
| static int lz4k_decompress_simple(const unsigned char *in, size_t in_len, unsigned char *out, |
| unsigned char *const op_end) |
| { |
| unsigned char *op = out; |
| const unsigned char *ip = in; |
| unsigned int bits_buffer32 = 0; |
| unsigned int remaining_bits = 32; |
| |
| bits_buffer32 = *((unsigned int *)ip); |
| ip += 4; |
| bits_buffer32 = bits_buffer32 >> 1; |
| remaining_bits -= 1; |
| |
| /* check lz4k tag */ |
| if (*((unsigned int *)(in + in_len - 4)) != LZ4K_TAG) { |
| return -1; |
| } |
| |
| while (1) { |
| RESERVE_16_BITS(); |
| if ((bits_buffer32 & 1) == 0) { |
| if ((bits_buffer32 & 2) == 0) { |
| unsigned short value; |
| int bits; |
| value = lz4k_literalch_decode[(bits_buffer32 >> 2) & 0x1ff]; |
| bits = value >> 8; |
| *op++ = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> (bits + 2); |
| remaining_bits -= bits + 2; |
| } else { |
| int litlen; |
| unsigned short value; |
| value = lz4k_literallen_decode[(bits_buffer32 >> 1) & 0x7f]; |
| if (value != 0) { |
| int bits = value >> 8; |
| litlen = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> (bits + 1); |
| remaining_bits -= bits + 1; |
| } else { |
| if (remaining_bits < 18) { |
| bits_buffer32 = |
| bits_buffer32 | ((*ip) << remaining_bits); |
| ip += 1; |
| remaining_bits += 8; |
| } |
| litlen = ((bits_buffer32 >> 6) & 0xfff) + 1; |
| bits_buffer32 = bits_buffer32 >> 18; |
| remaining_bits -= 18; |
| } |
| |
| while (1) { |
| while (remaining_bits > 8) { |
| unsigned short value; |
| int bits; |
| value = |
| lz4k_literalch_decode[bits_buffer32 & 0x1ff]; |
| bits = value >> 8; |
| *op++ = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> bits; |
| remaining_bits -= bits; |
| if (--litlen == 0) { |
| goto break_literal; |
| } |
| } |
| bits_buffer32 = |
| bits_buffer32 | (*((unsigned int *)ip)) << |
| remaining_bits; |
| ip += 3; |
| remaining_bits += 24; |
| } |
| } |
| |
| break_literal: |
| if (__builtin_expect(!!(op == op_end), 0)) |
| break; |
| } else { |
| bits_buffer32 = bits_buffer32 >> 1; |
| remaining_bits -= 1; |
| } |
| |
| { |
| int offset; |
| int len; |
| RESERVE_16_BITS(); |
| if ((bits_buffer32 & 1) == 0) { |
| unsigned short value = |
| lz4k_matchoff_decode[(bits_buffer32 & 0xff) >> 1]; |
| int bits = value >> 8; |
| offset = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> bits; |
| remaining_bits -= bits; |
| } else { |
| offset = (bits_buffer32 >> 1) & 0xfff; |
| bits_buffer32 = bits_buffer32 >> 13; |
| remaining_bits -= 13; |
| } |
| RESERVE_16_BITS(); |
| |
| if ((bits_buffer32 & 1) == 0) { |
| len = 3 + ((bits_buffer32 >> 1) & 1); |
| bits_buffer32 = bits_buffer32 >> 2; |
| remaining_bits -= 2; |
| } else if ((bits_buffer32 & 2) == 0) { |
| len = 5 + ((bits_buffer32 >> 2) & 3); |
| bits_buffer32 = bits_buffer32 >> 4; |
| remaining_bits -= 4; |
| } else { |
| unsigned short value = |
| lz4k_matchlen_decode[(bits_buffer32 >> 2) & 0x7f]; |
| if (value != 0) { |
| int bits = value >> 8; |
| len = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> (bits + 2); |
| remaining_bits -= (bits + 2); |
| } else { |
| len = (bits_buffer32 >> 4) & 0xfff; |
| bits_buffer32 = bits_buffer32 >> 16; |
| remaining_bits -= 16; |
| } |
| } |
| |
| if (__builtin_expect(!!((offset >> 2) != 0), 1)) { |
| const unsigned char *m_pos = op - offset; |
| if ((len & 1) != 0) { |
| *op++ = *m_pos++; |
| --len; |
| } |
| if ((len & 2) != 0) { |
| *(unsigned short *)op = *(unsigned short *)m_pos; |
| op += 2; |
| m_pos += 2; |
| len -= 2; |
| } |
| while (len > 0) { |
| *(unsigned int *)op = *(unsigned int *)m_pos; |
| op += 4; |
| m_pos += 4; |
| len -= 4; |
| } |
| } else if (__builtin_expect(!!(offset == 1), 1)) { |
| unsigned int value = *(op - 1); |
| value = value | (value << 8); |
| value = value | (value << 16); |
| if ((len & 1) != 0) { |
| *op++ = (unsigned char)value; |
| --len; |
| } |
| if ((len & 2) != 0) { |
| *(unsigned short *)op = (unsigned short)value; |
| op += 2; |
| len -= 2; |
| } |
| while (len > 0) { |
| *(unsigned int *)op = (unsigned int)value; |
| op += 4; |
| len -= 4; |
| } |
| } else { |
| const unsigned char *m_pos = op - offset; |
| if ((len & 1) != 0) { |
| *op++ = *m_pos++; |
| --len; |
| } |
| do { |
| *((unsigned short *)op) = *((unsigned short *)m_pos); |
| op += 2; |
| m_pos += 2; |
| len -= 2; |
| } while (len != 0); |
| } |
| } |
| if (__builtin_expect(!!(op == op_end), 0)) |
| break; |
| } |
| if (op != op_end) { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_UBIFS_FS |
| static int lz4k_decompress_hc(const unsigned char *in, size_t in_len, unsigned char *out, |
| unsigned char *const op_end) |
| { |
| unsigned char *op = out; |
| const unsigned char *ip = in; |
| unsigned int bits_buffer32 = 0; |
| unsigned int remaining_bits = 32; |
| int previous_off; |
| |
| bits_buffer32 = *((unsigned int *)ip); |
| ip += 4; |
| bits_buffer32 = bits_buffer32 >> 1; |
| remaining_bits -= 1; |
| |
| while (1) { |
| RESERVE_16_BITS(); |
| if ((bits_buffer32 & 1) == 0) { |
| if ((bits_buffer32 & 2) == 0) { |
| *op++ = (bits_buffer32 >> 2) & 0xff; |
| bits_buffer32 = bits_buffer32 >> (8 + 2); |
| remaining_bits -= 8 + 2; |
| } else { |
| int litlen; |
| unsigned short value; |
| value = lz4k_literallen_decode[(bits_buffer32 >> 1) & 0x7f]; |
| if (value != 0) { |
| int bits = value >> 8; |
| litlen = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> (bits + 1); |
| remaining_bits -= bits + 1; |
| } else { |
| if (remaining_bits < 18) { |
| bits_buffer32 = |
| bits_buffer32 | ((*ip) << remaining_bits); |
| ip += 1; |
| remaining_bits += 8; |
| } |
| litlen = ((bits_buffer32 >> 6) & 0xfff) + 1; |
| bits_buffer32 = bits_buffer32 >> 18; |
| remaining_bits -= 18; |
| } |
| |
| RESERVE_16_BITS(); |
| if ((litlen & 1) != 0) { |
| *op++ = bits_buffer32 & 0xff; |
| bits_buffer32 = bits_buffer32 >> 8; |
| remaining_bits -= 8; |
| --litlen; |
| RESERVE_16_BITS(); |
| } |
| do { |
| *(unsigned short *)op = bits_buffer32 & 0xffff; |
| bits_buffer32 = |
| (bits_buffer32 >> 16) | (*(unsigned short *)ip) << |
| (remaining_bits - 16); |
| ip += 2; |
| op += 2; |
| litlen -= 2; |
| } while (litlen > 0); |
| } |
| |
| break_literal: |
| if (__builtin_expect(!!(op == op_end), 0)) |
| break; |
| } else { |
| bits_buffer32 = bits_buffer32 >> 1; |
| remaining_bits -= 1; |
| } |
| |
| { |
| int offset; |
| int len; |
| RESERVE_16_BITS(); |
| if ((bits_buffer32 & 1) == 0) { |
| unsigned short value = |
| lz4k_matchoff_decode_hc[(bits_buffer32 & 0xff) >> 1]; |
| int bits = value >> 8; |
| int code = value & 0xff; |
| if (code == 0) { /* previous */ |
| offset = previous_off; |
| } else { |
| offset = code; |
| } |
| bits_buffer32 = bits_buffer32 >> bits; |
| remaining_bits -= bits; |
| } else { |
| int index = op - out; |
| int bits = 32 - __builtin_clz(index); |
| offset = (bits_buffer32 >> 1) & ((1 << bits) - 1); |
| bits_buffer32 = bits_buffer32 >> bits + 1; |
| remaining_bits -= bits + 1; |
| } |
| previous_off = offset; |
| RESERVE_16_BITS(); |
| |
| { |
| if ((bits_buffer32 & 0x1f) != 0x1f) { |
| unsigned short value = |
| lz4k_matchlen_decode_hc[(bits_buffer32) & 0xff]; |
| int bits = value >> 8; |
| len = value & 0xff; |
| bits_buffer32 = bits_buffer32 >> bits; |
| remaining_bits -= bits; |
| } else { |
| len = (bits_buffer32 >> 5) & 0xfff; |
| bits_buffer32 = bits_buffer32 >> 17; |
| remaining_bits -= 17; |
| } |
| } |
| |
| if (__builtin_expect(!!((offset >> 2) != 0), 1)) { |
| const unsigned char *m_pos = op - offset; |
| if ((len & 1) != 0) { |
| *op++ = *m_pos++; |
| --len; |
| } |
| if ((len & 2) != 0) { |
| *(unsigned short *)op = *(unsigned short *)m_pos; |
| op += 2; |
| m_pos += 2; |
| len -= 2; |
| } |
| while (len > 0) { |
| *(unsigned int *)op = *(unsigned int *)m_pos; |
| op += 4; |
| m_pos += 4; |
| len -= 4; |
| } |
| } else if (__builtin_expect(!!(offset == 1), 1)) { |
| unsigned int value = *(op - 1); |
| value = value | (value << 8); |
| value = value | (value << 16); |
| if ((len & 1) != 0) { |
| *op++ = (unsigned char)value; |
| --len; |
| } |
| if ((len & 2) != 0) { |
| *(unsigned short *)op = (unsigned short)value; |
| op += 2; |
| len -= 2; |
| } |
| while (len > 0) { |
| *(unsigned int *)op = (unsigned int)value; |
| op += 4; |
| len -= 4; |
| } |
| } else { |
| const unsigned char *m_pos = op - offset; |
| if ((len & 1) != 0) { |
| *op++ = *m_pos++; |
| --len; |
| } |
| do { |
| *((unsigned short *)op) = *((unsigned short *)m_pos); |
| op += 2; |
| m_pos += 2; |
| len -= 2; |
| } while (len != 0); |
| } |
| } |
| if (__builtin_expect(!!(op == op_end), 0)) |
| break; |
| } |
| if (op != op_end) { |
| return -1; |
| } |
| |
| return 0; |
| } |
| #endif /* CONFIG_UBIFS_FS */ |
| |
| int lz4k_decompress_safe(const unsigned char *in, size_t in_len, unsigned char *out, |
| size_t *pout_len) |
| { |
| int result = 0; |
| unsigned char *const op_end = out + *pout_len; |
| |
| |
| if (*pout_len > 4096) { |
| return -1; |
| } |
| if (in_len == 0) { |
| return -1; |
| } |
| |
| result = lz4k_decompress_simple(in, in_len, out, op_end); |
| |
| |
| return result; |
| } |
| |
| #ifdef CONFIG_UBIFS_FS |
| |
| int lz4k_decompress_ubifs(const unsigned char *in, size_t in_len, unsigned char *out, |
| size_t *pout_len) |
| { |
| int result = 0; |
| unsigned char *const op_end = out + *pout_len; |
| |
| |
| if (*pout_len > 4096) { |
| return -1; |
| } |
| if (in_len == 0) { |
| return -1; |
| } |
| if ((*in & 1) == 0) { |
| result = lz4k_decompress_simple(in, in_len, out, op_end); |
| } else { |
| result = lz4k_decompress_hc(in, in_len, out, op_end); |
| } |
| |
| |
| return result; |
| } |
| #endif /* CONFIG_UBIFS_FS */ |
