mirror of
https://github.com/DarkPlacesEngine/gmqcc.git
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243 lines
9.8 KiB
C
243 lines
9.8 KiB
C
/*
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* Copyright (C) 2012, 2013
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* Dale Weiler
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* Wolfgang Bumiller
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "gmqcc.h"
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#include "platform.h"
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/*
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* Initially this was handled with a table in the gmqcc.h header, but
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* much to my surprise the contents of the table was duplicated for
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* each translation unit, causing all these strings to be duplicated
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* for every .c file it was included into. This method culls back on
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* it. This is a 'utility' function because the executor also depends
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* on this for disassembled byte-code.
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*/
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const char *util_instr_str[VINSTR_END] = {
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"DONE", "MUL_F", "MUL_V", "MUL_FV",
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"MUL_VF", "DIV_F", "ADD_F", "ADD_V",
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"SUB_F", "SUB_V", "EQ_F", "EQ_V",
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"EQ_S", "EQ_E", "EQ_FNC", "NE_F",
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"NE_V", "NE_S", "NE_E", "NE_FNC",
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"LE", "GE", "LT", "GT",
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"LOAD_F", "LOAD_V", "LOAD_S", "LOAD_ENT",
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"LOAD_FLD", "LOAD_FNC", "ADDRESS", "STORE_F",
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"STORE_V", "STORE_S", "STORE_ENT", "STORE_FLD",
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"STORE_FNC", "STOREP_F", "STOREP_V", "STOREP_S",
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"STOREP_ENT", "STOREP_FLD", "STOREP_FNC", "RETURN",
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"NOT_F", "NOT_V", "NOT_S", "NOT_ENT",
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"NOT_FNC", "IF", "IFNOT", "CALL0",
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"CALL1", "CALL2", "CALL3", "CALL4",
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"CALL5", "CALL6", "CALL7", "CALL8",
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"STATE", "GOTO", "AND", "OR",
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"BITAND", "BITOR"
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};
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/*
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* only required if big endian .. otherwise no need to swap
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* data.
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*/
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#if PLATFORM_BYTE_ORDER == GMQCC_BYTE_ORDER_BIG
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static GMQCC_INLINE void util_swap16(uint16_t *d, size_t l) {
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while (l--) {
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d[l] = (d[l] << 8) | (d[l] >> 8);
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}
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}
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static GMQCC_INLINE void util_swap32(uint32_t *d, size_t l) {
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while (l--) {
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uint32_t v;
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v = ((d[l] << 8) & 0xFF00FF00) | ((d[l] >> 8) & 0x00FF00FF);
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d[l] = (v << 16) | (v >> 16);
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}
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}
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/* Some strange system doesn't like constants that big, AND doesn't recognize an ULL suffix
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* so let's go the safe way
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*/
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static GMQCC_INLINE void util_swap64(uint32_t *d, size_t l) {
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/*
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while (l--) {
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uint64_t v;
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v = ((d[l] << 8) & 0xFF00FF00FF00FF00) | ((d[l] >> 8) & 0x00FF00FF00FF00FF);
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v = ((v << 16) & 0xFFFF0000FFFF0000) | ((v >> 16) & 0x0000FFFF0000FFFF);
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d[l] = (v << 32) | (v >> 32);
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}
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*/
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size_t i;
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for (i = 0; i < l; i += 2) {
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uint32_t v1 = d[i];
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d[i] = d[i+1];
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d[i+1] = v1;
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util_swap32(d+i, 2);
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}
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}
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#endif
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void util_endianswap(void *_data, size_t length, unsigned int typesize) {
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# if PLATFORM_BYTE_ORDER == -1 /* runtime check */
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if (*((char*)&typesize))
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return;
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#else
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/* prevent unused warnings */
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(void) _data;
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(void) length;
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(void) typesize;
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# if PLATFORM_BYTE_ORDER == GMQCC_BYTE_ORDER_LITTLE
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return;
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# else
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switch (typesize) {
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case 1: return;
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case 2:
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util_swap16((uint16_t*)_data, length>>1);
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return;
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case 4:
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util_swap32((uint32_t*)_data, length>>2);
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return;
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case 8:
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util_swap64((uint32_t*)_data, length>>3);
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return;
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default: exit(EXIT_FAILURE); /* please blow the fuck up! */
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}
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# endif
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#endif
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}
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/*
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* CRC algorithms vary in the width of the polynomial, the value of said polynomial,
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* the initial value used for the register, weather the bits of each byte are reflected
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* before being processed, weather the algorithm itself feeds input bytes through the
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* register or XORs them with a byte from one end and then straight into the table, as
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* well as (but not limited to the idea of reflected versions) where the final register
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* value becomes reversed, and finally weather the value itself is used to XOR the final
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* register value. AS such you can already imagine how painfully annoying CRCs are,
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* of course we stand to target Quake, which expects it's certain set of rules for proper
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* calculation of a CRC.
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*
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* In most traditional CRC algorithms on uses a reflected table driven method where a value
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* or register is reflected if it's bits are swapped around it's center. For example:
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* take the bits 0101 is the 4-bit reflection of 1010, and respectfully 0011 would be the
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* reflection of 1100. Quake however expects a NON-Reflected CRC on the output, but still
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* requires a final XOR on the values (0xFFFF and 0x0000) this is a standard CCITT CRC-16
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* which I respectfully as a programmer don't agree with.
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*
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* So now you know what we target, and why we target it, despite how unsettling it may seem
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* but those are what Quake seems to request.
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*/
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static const uint16_t util_crc16_table[] = {
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, 0x8108,
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0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, 0x1231, 0x0210,
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0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, 0x9339, 0x8318, 0xB37B,
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0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, 0x2462, 0x3443, 0x0420, 0x1401,
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0x64E6, 0x74C7, 0x44A4, 0x5485, 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE,
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0xF5CF, 0xC5AC, 0xD58D, 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6,
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0x5695, 0x46B4, 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D,
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0xC7BC, 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, 0x5AF5,
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0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, 0xDBFD, 0xCBDC,
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0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, 0x6CA6, 0x7C87, 0x4CE4,
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0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD,
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0xAD2A, 0xBD0B, 0x8D68, 0x9D49, 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13,
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0x2E32, 0x1E51, 0x0E70, 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A,
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0x9F59, 0x8F78, 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E,
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0xE16F, 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, 0x02B1,
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0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, 0xB5EA, 0xA5CB,
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0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, 0x34E2, 0x24C3, 0x14A0,
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0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xA7DB, 0xB7FA, 0x8799, 0x97B8,
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0xE75F, 0xF77E, 0xC71D, 0xD73C, 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657,
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0x7676, 0x4615, 0x5634, 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9,
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0xB98A, 0xA9AB, 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882,
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0x28A3, 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
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0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, 0xFD2E,
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0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, 0x7C26, 0x6C07,
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0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, 0xEF1F, 0xFF3E, 0xCF5D,
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0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, 0x6E17, 0x7E36, 0x4E55, 0x5E74,
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0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
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};
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/* Non - Reflected */
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uint16_t util_crc16(uint16_t current, const char *k, size_t len) {
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register uint16_t h = current;
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for (; len; --len, ++k)
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h = util_crc16_table[(h>>8)^((unsigned char)*k)]^(h<<8);
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return h;
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}
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/* Reflective Variation (for reference) */
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#if 0
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uint16_t util_crc16(const char *k, int len, const short clamp) {
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register uint16_t h= (uint16_t)0xFFFFFFFF;
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for (; len; --len, ++k)
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h = util_crc16_table[(h^((unsigned char)*k))&0xFF]^(h>>8);
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return (~h)%clamp;
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}
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#endif
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/*
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* modifier is the match to make and the transposition from it, while add is the upper-value that determines the
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* transposition from uppercase to lower case.
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*/
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static GMQCC_INLINE size_t util_strtransform(const char *in, char *out, size_t outsz, const char *mod, int add) {
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size_t sz = 1;
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for (; *in && sz < outsz; ++in, ++out, ++sz) {
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*out = (*in == mod[0])
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? mod[1]
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: (util_isalpha(*in) && ((add > 0) ? util_isupper(*in) : !util_isupper(*in)))
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? *in + add
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: *in;
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}
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*out = 0;
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return sz-1;
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}
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size_t util_strtocmd(const char *in, char *out, size_t outsz) {
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return util_strtransform(in, out, outsz, "-_", 'A'-'a');
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}
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size_t util_strtononcmd(const char *in, char *out, size_t outsz) {
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return util_strtransform(in, out, outsz, "_-", 'a'-'A');
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}
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size_t util_optimizationtostr(const char *in, char *out, size_t outsz) {
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return util_strtransform(in, out, outsz, "_ ", 'a'-'A');
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}
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int util_asprintf(char **ret, const char *fmt, ...) {
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va_list args;
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int read;
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va_start(args, fmt);
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read = platform_vasprintf(ret, fmt, args);
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va_end (args);
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return read;
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}
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void util_seed(uint32_t value) {
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srand((int)value);
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}
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uint32_t util_rand() {
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return rand();
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}
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