diff options
Diffstat (limited to 'src/app/deflatetest')
| -rw-r--r-- | src/app/deflatetest/Makefile.inc | 3 | ||||
| -rw-r--r-- | src/app/deflatetest/main.cc | 358 |
2 files changed, 10 insertions, 351 deletions
diff --git a/src/app/deflatetest/Makefile.inc b/src/app/deflatetest/Makefile.inc index b8ed566..84a6aff 100644 --- a/src/app/deflatetest/Makefile.inc +++ b/src/app/deflatetest/Makefile.inc @@ -7,4 +7,7 @@ ifdef app override timer_s = 0 override loop = 0 + override arch_drivers += ,counter endif + +CXX_TARGETS += src/lib/udeflate.cc diff --git a/src/app/deflatetest/main.cc b/src/app/deflatetest/main.cc index db8e4a5..516a6a0 100644 --- a/src/app/deflatetest/main.cc +++ b/src/app/deflatetest/main.cc @@ -7,6 +7,9 @@ #include "driver/gpio.h" #include "driver/stdout.h" #include "driver/uptime.h" +#include "driver/counter.h" + +#include "lib/udeflate.h" #define UDEFLATE_ERR_LENGTH (-1) #define UDEFLATE_ERR_METHOD (-2) @@ -43,357 +46,7 @@ unsigned char const deflate_input[] = { }; */ - -unsigned char* udeflate_input_end; -unsigned char* udeflate_input_now; -uint8_t udeflate_bit_offset = 0; - unsigned char deflate_output[1024]; -uint16_t deflate_output_pos; - -uint16_t const udeflate_length_offsets[] = { - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, - 83, 99, 115, 131, 163, 195, 227, 258 -}; - -// TODO (index < 4 || index == 28) ? 0 : (index-4) >> 2 -uint8_t const udeflate_length_bits[] = { - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, - 5, 5, 5, 0 -}; - -uint16_t const udeflate_distance_offsets[] = { - 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, - 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 -}; - -// TODO index < 2 ? 0 : (index-2) >> 1 -uint8_t const udeflate_distance_bits[] = { - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, - 11, 11, 12, 12, 13, 13 -}; - -uint8_t const udeflate_hclen_index[] = { - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 -}; - -uint8_t udeflate_hc_lengths[19]; -uint8_t udeflate_lld_lengths[318]; - -static uint16_t udeflate_rev_word(uint16_t word, uint8_t bits) -{ - uint16_t ret = 0; - uint16_t mask = 1; - for (uint16_t rmask = 1 << (bits-1); rmask > 0; rmask >>= 1) { - if (word & rmask) { - ret |= mask; - } - mask <<= 1; - } - return ret; -} - -static uint8_t udeflate_bitmask(uint8_t bit_count) -{ - return (1 << bit_count) - 1; -} - -static uint16_t udeflate_get_word() -{ - uint16_t ret = 0; - ret |= (udeflate_input_now[0] >> udeflate_bit_offset); - ret |= (uint16_t)udeflate_input_now[1] << (8 - udeflate_bit_offset); - if (udeflate_bit_offset) { - ret |= (uint16_t)(udeflate_input_now[2] & udeflate_bitmask(udeflate_bit_offset)) << (16 - udeflate_bit_offset); - } -#ifdef UDEFLATE_DEBUG - kout << "get_word = " << bin << ret << dec << endl; -#endif - return ret; -} - -static uint16_t udeflate_get_bits(uint8_t num_bits) -{ - uint16_t ret = udeflate_get_word(); - udeflate_bit_offset += num_bits; - while (udeflate_bit_offset >= 8) { - udeflate_input_now++; - udeflate_bit_offset -= 8; - } - return ret & udeflate_bitmask(num_bits); -} - -/* - * Assumptions: - * * huffman code length is limited to 11 bits - * * there are no more than 255 huffman codes with the same length - * - * Rationale: longer huffman codes might appear when handling large data - * sets. We don't do that; instead, we expect the uncompressed source to - * be no more than a few kB of data. - */ - -// used for huffman alphabet in type 2 and literal/length alphabet in type 1&2 -uint8_t udeflate_bl_count_ll[12]; -uint16_t udeflate_next_code_ll[12]; - -// used for distance alphabet in types 1&2 -uint8_t udeflate_bl_count_d[12]; -uint16_t udeflate_next_code_d[12]; - -static void udeflate_build_alphabet(uint8_t* lengths, uint16_t size, uint8_t* bl_count, uint16_t* next_code) -{ - uint16_t i; - uint16_t code = 0; - uint16_t max_len = 0; - for (i = 0; i < 12; i++) { - bl_count[i] = 0; - } - - for (i = 0; i < size; i++) { - if (lengths[i]) { - bl_count[lengths[i]]++; - } - if (lengths[i] > max_len) { - max_len = lengths[i]; - } - } - - for (i = 1; i < max_len+1; i++) { - code = (code + bl_count[i-1]) << 1; - next_code[i] = code; - } - -#ifdef UDEFLATE_DEBUG - for (i = 0; i < 12; i++) { - kout << "bl_count[" << i << "] = " << bl_count[i] << endl; - } - for (i = 0; i < 12; i++) { - kout << "next_code[" << i << "] = " << next_code[i] << endl; - } -#endif -} - -static uint16_t udeflate_huff(uint8_t* lengths, uint16_t size, uint8_t* bl_count, uint16_t* next_code) -{ - uint16_t next_word = udeflate_get_word(); - for (uint8_t num_bits = 1; num_bits < 12; num_bits++) { - uint16_t next_bits = udeflate_rev_word(next_word, num_bits); - if (bl_count[num_bits] && next_bits >= next_code[num_bits] && next_bits < next_code[num_bits] + bl_count[num_bits] ) { -#ifdef UDEFLATE_DEBUG - kout << "found huffman code, length = " << num_bits << endl; -#endif - udeflate_bit_offset += num_bits; - while (udeflate_bit_offset >= 8) { - udeflate_input_now++; - udeflate_bit_offset -= 8; - } - uint8_t len_pos = next_bits; - uint8_t cur_pos = next_code[num_bits]; - for (uint16_t i = 0; i < size; i++) { - if (lengths[i] == num_bits) { - if (cur_pos == len_pos) { - return i; - } - cur_pos++; - } - } - } - } - return 65535; -} - -static int8_t udeflate_huffman(uint8_t* ll_lengths, uint16_t ll_size, uint8_t* d_lengths, uint8_t d_size) -{ - uint16_t code; - uint16_t dcode; - deflate_output_pos = 0; - while (1) { - code = udeflate_huff(ll_lengths, ll_size, udeflate_bl_count_ll, udeflate_next_code_ll); -#ifdef UDEFLATE_DEBUG - kout << "code " << code << endl; -#endif - if (code < 256) { - deflate_output[deflate_output_pos] = code; - deflate_output_pos++; - } else if (code == 256) { - return 0; - } else { - uint16_t len_val = udeflate_length_offsets[code - 257]; - uint8_t extra_bits = udeflate_length_bits[code - 257]; - if (extra_bits) { - len_val += udeflate_get_bits(extra_bits); - } - dcode = udeflate_huff(d_lengths, d_size, udeflate_bl_count_d, udeflate_next_code_d); - uint16_t dist_val = udeflate_distance_offsets[dcode]; - extra_bits = udeflate_distance_bits[dcode]; - if (extra_bits) { - dist_val += udeflate_get_bits(extra_bits); - } - while (len_val--) { - deflate_output[deflate_output_pos] = deflate_output[deflate_output_pos-dist_val]; - deflate_output_pos++; - } - } - } -} - -static int8_t udeflate_static_huffman() -{ - uint16_t i; - for (i = 0; i <= 143; i++) { - udeflate_lld_lengths[i] = 8; - } - for (i = 144; i <= 255; i++) { - udeflate_lld_lengths[i] = 9; - } - for (i = 256; i <= 279; i++) { - udeflate_lld_lengths[i] = 7; - } - for (i = 280; i <= 284; i++) { - udeflate_lld_lengths[i] = 8; - } - for (i = 285; i <= 285+29; i++) { - udeflate_lld_lengths[i] = 5; - } - - udeflate_build_alphabet(udeflate_lld_lengths, 285, udeflate_bl_count_ll, udeflate_next_code_ll); - udeflate_build_alphabet(udeflate_lld_lengths + 285, 29, udeflate_bl_count_d, udeflate_next_code_d); - return udeflate_huffman(udeflate_lld_lengths, 285, udeflate_lld_lengths + 285, 29); -} - -static int8_t udeflate_dynamic_huffman() -{ - uint8_t i; - uint16_t hlit = 257 + udeflate_get_bits(5); - uint8_t hdist = 1 + udeflate_get_bits(5); - uint8_t hclen = 4 + udeflate_get_bits(4); - -#ifdef UDEFLATE_DEBUG - kout << "hlit=" << hlit << endl; - kout << "hdist=" << hdist << endl; - kout << "hclen=" << hclen << endl; -#endif - - for (i = 0; i < hclen; i++) { - udeflate_hc_lengths[udeflate_hclen_index[i]] = udeflate_get_bits(3); - } - for (i = hclen; i < sizeof(udeflate_hc_lengths); i++) { - udeflate_hc_lengths[udeflate_hclen_index[i]] = 0; - } - - udeflate_build_alphabet(udeflate_hc_lengths, sizeof(udeflate_hc_lengths), udeflate_bl_count_ll, udeflate_next_code_ll); - - uint16_t items_processed = 0; - while (items_processed < hlit + hdist) { - uint8_t code = udeflate_huff(udeflate_hc_lengths, 19, udeflate_bl_count_ll, udeflate_next_code_ll); -#ifdef UDEFLATE_DEBUG - kout << "code = " << code << endl; -#endif - if (code == 16) { - uint8_t copy_count = 3 + udeflate_get_bits(2); - for (uint8_t i = 0; i < copy_count; i++) { - udeflate_lld_lengths[items_processed] = udeflate_lld_lengths[items_processed-1]; - items_processed++; - } - } - else if (code == 17) { - uint8_t null_count = 3 + udeflate_get_bits(3); - for (uint8_t i = 0; i < null_count; i++) { - udeflate_lld_lengths[items_processed] = 0; - items_processed++; - } - } - else if (code == 18) { - uint8_t null_count = 11 + udeflate_get_bits(7); - for (uint8_t i = 0; i < null_count; i++) { - udeflate_lld_lengths[items_processed] = 0; - items_processed++; - } - } - else { - udeflate_lld_lengths[items_processed] = code; - items_processed++; - } - } - - udeflate_build_alphabet(udeflate_lld_lengths, hlit, udeflate_bl_count_ll, udeflate_next_code_ll); - udeflate_build_alphabet(udeflate_lld_lengths + hlit, hdist, udeflate_bl_count_d, udeflate_next_code_d); - - return udeflate_huffman(udeflate_lld_lengths, hlit, udeflate_lld_lengths + hlit, hdist); - - return 0; -} - -int8_t udeflate(unsigned char* buf, uint16_t buf_len) -{ - uint8_t is_final = buf[0] & 0x01; - uint8_t block_type = (buf[0] & 0x06) >> 1; -#ifdef UDEFLATE_DEBUG - kout << "is_final=" << is_final << " block_type=" << block_type << endl; -#endif - - udeflate_input_now = buf; - udeflate_input_end = buf + buf_len; - udeflate_bit_offset = 3; - - if (block_type == 1) { - return udeflate_static_huffman(); - } - if (block_type == 2) { - return udeflate_dynamic_huffman(); - } - - return UDEFLATE_ERR_BLOCK; -} - -int8_t udeflate_zlib(unsigned char* buf, uint16_t buf_len) -{ - if (buf_len < 4) { - return UDEFLATE_ERR_LENGTH; - } - uint8_t zlib_method = buf[0] & 0x0f; - uint16_t zlib_window_size = 1 << (8 + ((buf[0] & 0xf0) >> 4)); - uint8_t zlib_flags = buf[1]; - -#ifdef UDEFLATE_DEBUG - kout << "zlib_method=" << zlib_method << endl; - kout << "zlib_window_size=" << zlib_window_size << endl; -#endif - - if (zlib_method != 8) { - return UDEFLATE_ERR_METHOD; - } - - if (zlib_flags & 0x10) { - return UDEFLATE_ERR_FDICT; - } - - uint8_t ret = udeflate(buf+2, buf_len-2); - -#ifdef UDEFLATE_CHECKSUM - if (ret == 0) { - uint16_t udeflate_s1 = 1; - uint16_t udeflate_s2 = 0; - - for (uint16_t i = 0; i < deflate_output_pos; i++) { - udeflate_s1 = ((uint32_t)udeflate_s1 + (uint32_t)deflate_output[i]) % 65521; - udeflate_s2 = ((uint32_t)udeflate_s2 + (uint32_t)udeflate_s1) % 65521; - } - - if (udeflate_bit_offset) { - udeflate_input_now++; - } - - if ((udeflate_s2 != (((uint16_t)udeflate_input_now[0] << 8) | (uint16_t)udeflate_input_now[1])) - || (udeflate_s1 != (((uint16_t)udeflate_input_now[2] << 8) | (uint16_t)udeflate_input_now[3]))) { - return UDEFLATE_ERR_CHECKSUM; - } - } -#endif - - return ret; -} int main(void) { @@ -402,9 +55,12 @@ int main(void) kout.setup(); for (uint8_t i = 0; i < 5; i++) { - int8_t ret = udeflate_zlib((unsigned char*)deflate_input, sizeof(deflate_input)); + counter.start(); + int8_t ret = udeflate_zlib((unsigned char*)deflate_input, sizeof(deflate_input), deflate_output, sizeof(deflate_output)); + counter.stop(); kout << "udeflate returned " << ret << endl; kout << "Output: " << (char*)deflate_output << endl; + kout << "took " << counter.value << "/" << counter.overflow << " cycles" << endl; } arch.idle(); |