1a0b542ae6
* Impl. sectioned font table in firmware * make_translation.py: Extract build_symbol_conversion_table function * Put translation indices and strings in a struct * Move translation objcopy step to Python * Impl. multi-language firmware demo * Impl. strings-compressed multi-lang firmware demo * Add font compression to multi-lang demo * Refactor Makefile a bit * Fix rules for make < 4.3 * Add more multi-lang groups * Add Pinecil multi-lang CI build * Add lzfx compression license text * Remote multi-language demo group * Fix build after merge * Import code from BriefLZ * Change brieflz for our use case * Change compression to use brieflz * Remove lzfx code * Update license file for brieflz * Exclude brieflz files from format check * Add BriefLZ test
272 lines
6.9 KiB
C
272 lines
6.9 KiB
C
/*
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* BriefLZ - small fast Lempel-Ziv
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*
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* C depacker
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*
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* Copyright (c) 2002-2018 Joergen Ibsen
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must
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* not claim that you wrote the original software. If you use this
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* software in a product, an acknowledgment in the product
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* documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must
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* not be misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*/
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#include "brieflz.h"
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/* Internal data structure */
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struct blz_state {
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const unsigned char *src;
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unsigned char *dst;
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unsigned int tag;
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int bits_left;
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};
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#if !defined(BLZ_NO_LUT)
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static const unsigned char blz_gamma_lookup[256][2] = {
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/* 00xxxxxx = 2 */
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
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/* 0100xxxx = 4 */
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{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
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{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
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/* 010100xx = 8 */
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{8, 6}, {8, 6}, {8, 6}, {8, 6},
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/* 01010100 = 16 01010101 = 16+ 01010110 = 17 01010111 = 17+ */
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{16, 8}, {16, 0}, {17, 8}, {17, 0},
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/* 010110xx = 9 */
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{9, 6}, {9, 6}, {9, 6}, {9, 6},
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/* 01011100 = 18 01011101 = 18+ 01011110 = 19 01011111 = 19+ */
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{18, 8}, {18, 0}, {19, 8}, {19, 0},
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/* 0110xxxx = 5 */
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{5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4},
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{5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4}, {5, 4},
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/* 011100xx = 10 */
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{10, 6}, {10, 6}, {10, 6}, {10, 6},
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/* 01110100 = 20 01110101 = 20+ 01110110 = 21 01110111 = 21+ */
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{20, 8}, {20, 0}, {21, 8}, {21, 0},
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/* 011110xx = 11 */
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{11, 6}, {11, 6}, {11, 6}, {11, 6},
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/* 01111100 = 22 01111101 = 22+ 01111110 = 23 01111111 = 23+ */
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{22, 8}, {22, 0}, {23, 8}, {23, 0},
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/* 10xxxxxx = 3 */
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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{3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2}, {3, 2},
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/* 1100xxxx = 6 */
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{6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4},
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{6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4}, {6, 4},
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/* 110100xx = 12 */
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{12, 6}, {12, 6}, {12, 6}, {12, 6},
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/* 11010100 = 24 11010101 = 24+ 11010110 = 25 11010111 = 25+ */
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{24, 8}, {24, 0}, {25, 8}, {25, 0},
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/* 110110xx = 13 */
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{13, 6}, {13, 6}, {13, 6}, {13, 6},
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/* 11011100 = 26 11011101 = 26+ 11011110 = 27 11011111 = 27+ */
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{26, 8}, {26, 0}, {27, 8}, {27, 0},
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/* 1110xxxx = 7 */
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{7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4},
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{7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4}, {7, 4},
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/* 111100xx = 14 */
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{14, 6}, {14, 6}, {14, 6}, {14, 6},
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/* 11110100 = 28 11110101 = 28+ 11110110 = 29 11110111 = 29+ */
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{28, 8}, {28, 0}, {29, 8}, {29, 0},
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/* 111110xx = 15 */
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{15, 6}, {15, 6}, {15, 6}, {15, 6},
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/* 11111100 = 30 11111101 = 30+ 11111110 = 31 11111111 = 31+ */
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{30, 8}, {30, 0}, {31, 8}, {31, 0}
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};
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#endif
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static unsigned int
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blz_getbit(struct blz_state *bs)
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{
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unsigned int bit;
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/* Check if tag is empty */
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if (!bs->bits_left--) {
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/* Load next tag */
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bs->tag = (unsigned int) bs->src[0]
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| ((unsigned int) bs->src[1] << 8);
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bs->src += 2;
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bs->bits_left = 15;
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}
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/* Shift bit out of tag */
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bit = (bs->tag & 0x8000) ? 1 : 0;
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bs->tag <<= 1;
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return bit;
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}
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static unsigned long
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blz_getgamma(struct blz_state *bs)
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{
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unsigned long result = 1;
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#if !defined(BLZ_NO_LUT)
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/* Decode up to 8 bits of gamma2 code using lookup if possible */
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if (bs->bits_left >= 8) {
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unsigned int top8 = (bs->tag >> 8) & 0x00FF;
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int shift;
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result = blz_gamma_lookup[top8][0];
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shift = (int) blz_gamma_lookup[top8][1];
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if (shift) {
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bs->tag <<= shift;
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bs->bits_left -= shift;
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return result;
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}
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bs->tag <<= 8;
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bs->bits_left -= 8;
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}
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#endif
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/* Input gamma2-encoded bits */
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do {
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result = (result << 1) + blz_getbit(bs);
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} while (blz_getbit(bs));
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return result;
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}
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unsigned long
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blz_depack(const void *src, void *dst, unsigned long depacked_size)
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{
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struct blz_state bs;
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unsigned long dst_size = 0;
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bs.src = (const unsigned char *) src;
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bs.dst = (unsigned char *) dst;
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/* Initialise to one bit left in tag; that bit is zero (a literal) */
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bs.bits_left = 1;
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bs.tag = 0x4000;
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/* Main decompression loop */
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while (dst_size < depacked_size) {
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if (blz_getbit(&bs)) {
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/* Input match length and offset */
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unsigned long len = blz_getgamma(&bs) + 2;
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unsigned long off = blz_getgamma(&bs) - 2;
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off = (off << 8) + (unsigned long) *bs.src++ + 1;
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/* Copy match */
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{
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const unsigned char *p = bs.dst - off;
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unsigned long i;
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for (i = len; i > 0; --i) {
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*bs.dst++ = *p++;
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}
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}
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dst_size += len;
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}
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else {
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/* Copy literal */
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*bs.dst++ = *bs.src++;
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dst_size++;
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}
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}
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/* Return decompressed size */
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return dst_size;
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}
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unsigned long
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blz_depack_srcsize(const void *src, void *dst, unsigned long src_size)
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{
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struct blz_state bs;
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unsigned long dst_size = 0;
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const unsigned char *src_end = src + src_size;
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bs.src = (const unsigned char *) src;
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bs.dst = (unsigned char *) dst;
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/* Initialise to one bit left in tag; that bit is zero (a literal) */
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bs.bits_left = 1;
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bs.tag = 0x4000;
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/* Main decompression loop */
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while (bs.src < src_end) {
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if (blz_getbit(&bs)) {
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/* Input match length and offset */
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unsigned long len = blz_getgamma(&bs) + 2;
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unsigned long off = blz_getgamma(&bs) - 2;
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off = (off << 8) + (unsigned long) *bs.src++ + 1;
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/* Copy match */
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{
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const unsigned char *p = bs.dst - off;
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unsigned long i;
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for (i = len; i > 0; --i) {
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*bs.dst++ = *p++;
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}
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}
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dst_size += len;
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}
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else {
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/* Copy literal */
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*bs.dst++ = *bs.src++;
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dst_size++;
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}
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}
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/* Return decompressed size */
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return dst_size;
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}
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