// Adapted from: https://github.com/kstenerud/KSCrash // // SentryCrashString.m // // Created by Karl Stenerud on 2012-09-15. // // Copyright (c) 2012 Karl Stenerud. All rights reserved. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall remain in place // in this source code. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // #include "SentryCrashString.h" #include "SentryCrashSystemCapabilities.h" #include #include // Compiler hints for "if" statements #define likely_if(x) if (__builtin_expect(x, 1)) #define unlikely_if(x) if (__builtin_expect(x, 0)) static const int g_printableControlChars[0x20] = { // Only tab, CR, and LF are considered printable // 1 2 3 4 5 6 7 8 9 a b c d e f 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; static const int g_continuationByteCount[0x40] = { /* --0xxxxx = 1 (00-1f) --10xxxx = 2 (20-2f) --110xxx = 3 (30-37) --1110xx = 4 (38-3b) --11110x = 5 (3c-3d) */ // 1 2 3 4 5 6 7 8 9 a b c d e f 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 0, 0, }; bool sentrycrashstring_isNullTerminatedUTF8String(const void *memory, int minLength, int maxLength) { const unsigned char *ptr = memory; const unsigned char *const end = ptr + maxLength; for (; ptr < end; ptr++) { unsigned char ch = *ptr; unlikely_if(ch == 0) { return (ptr - (const unsigned char *)memory) >= minLength; } unlikely_if(ch & 0x80) { unlikely_if((ch & 0xc0) != 0xc0) { return false; } int continuationBytes = g_continuationByteCount[ch & 0x3f]; unlikely_if(continuationBytes == 0 || ptr + continuationBytes >= end) { return false; } for (int i = 0; i < continuationBytes; i++) { ptr++; unlikely_if((*ptr & 0xc0) != 0x80) { return false; } } } else unlikely_if(ch < 0x20 && !g_printableControlChars[ch]) { return false; } } return false; } #define INV 0xff /** Lookup table for converting hex values to integers. * INV (0x11111) is used to mark invalid characters so that any attempted * invalid nybble conversion is always > 0xffff. */ static const unsigned int g_hexConversion[] = { INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, INV, INV, INV, INV, INV, INV, INV, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, INV, }; bool sentrycrashstring_extractHexValue(const char *string, int stringLength, uint64_t *const result) { if (stringLength > 0) { const unsigned char *current = (const unsigned char *)string; const unsigned char *const end = current + stringLength; for (;;) { #if SentryCrashCRASH_HAS_STRNSTR current = (const unsigned char *)strnstr( (const char *)current, "0x", (unsigned)(end - current)); #else current = (const unsigned char *)strstr((const char *)current, "0x"); unlikely_if(current >= end) { return false; } #endif unlikely_if(!current) { return false; } current += 2; // Must have at least one valid digit after "0x". unlikely_if(g_hexConversion[*current] == INV) { continue; } uint64_t accum = 0; unsigned int nybble = 0; while (current < end) { nybble = g_hexConversion[*current++]; unlikely_if(nybble == INV) { break; } accum <<= 4; accum += nybble; } *result = accum; return true; } } return false; }