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414 lines
9.0 KiB
C
414 lines
9.0 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*/
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#include "avb_util.h"
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#include <log.h>
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#include <malloc.h>
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#include <stdarg.h>
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uint32_t avb_be32toh(uint32_t in) {
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uint8_t* d = (uint8_t*)∈
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uint32_t ret;
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ret = ((uint32_t)d[0]) << 24;
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ret |= ((uint32_t)d[1]) << 16;
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ret |= ((uint32_t)d[2]) << 8;
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ret |= ((uint32_t)d[3]);
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return ret;
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}
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uint64_t avb_be64toh(uint64_t in) {
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uint8_t* d = (uint8_t*)∈
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uint64_t ret;
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ret = ((uint64_t)d[0]) << 56;
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ret |= ((uint64_t)d[1]) << 48;
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ret |= ((uint64_t)d[2]) << 40;
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ret |= ((uint64_t)d[3]) << 32;
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ret |= ((uint64_t)d[4]) << 24;
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ret |= ((uint64_t)d[5]) << 16;
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ret |= ((uint64_t)d[6]) << 8;
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ret |= ((uint64_t)d[7]);
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return ret;
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}
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/* Converts a 32-bit unsigned integer from host to big-endian byte order. */
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uint32_t avb_htobe32(uint32_t in) {
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union {
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uint32_t word;
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uint8_t bytes[4];
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} ret;
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ret.bytes[0] = (in >> 24) & 0xff;
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ret.bytes[1] = (in >> 16) & 0xff;
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ret.bytes[2] = (in >> 8) & 0xff;
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ret.bytes[3] = in & 0xff;
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return ret.word;
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}
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/* Converts a 64-bit unsigned integer from host to big-endian byte order. */
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uint64_t avb_htobe64(uint64_t in) {
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union {
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uint64_t word;
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uint8_t bytes[8];
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} ret;
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ret.bytes[0] = (in >> 56) & 0xff;
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ret.bytes[1] = (in >> 48) & 0xff;
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ret.bytes[2] = (in >> 40) & 0xff;
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ret.bytes[3] = (in >> 32) & 0xff;
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ret.bytes[4] = (in >> 24) & 0xff;
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ret.bytes[5] = (in >> 16) & 0xff;
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ret.bytes[6] = (in >> 8) & 0xff;
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ret.bytes[7] = in & 0xff;
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return ret.word;
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}
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int avb_safe_memcmp(const void* s1, const void* s2, size_t n) {
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const unsigned char* us1 = s1;
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const unsigned char* us2 = s2;
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int result = 0;
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if (0 == n) {
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return 0;
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}
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/*
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* Code snippet without data-dependent branch due to Nate Lawson
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* (nate@root.org) of Root Labs.
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*/
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while (n--) {
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result |= *us1++ ^ *us2++;
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}
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return result != 0;
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}
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bool avb_safe_add_to(uint64_t* value, uint64_t value_to_add) {
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uint64_t original_value;
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avb_assert(value != NULL);
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original_value = *value;
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*value += value_to_add;
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if (*value < original_value) {
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avb_error("Overflow when adding values.\n");
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return false;
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}
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return true;
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}
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bool avb_safe_add(uint64_t* out_result, uint64_t a, uint64_t b) {
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uint64_t dummy;
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if (out_result == NULL) {
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out_result = &dummy;
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}
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*out_result = a;
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return avb_safe_add_to(out_result, b);
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}
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bool avb_validate_utf8(const uint8_t* data, size_t num_bytes) {
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size_t n;
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unsigned int num_cc;
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for (n = 0, num_cc = 0; n < num_bytes; n++) {
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uint8_t c = data[n];
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if (num_cc > 0) {
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if ((c & (0x80 | 0x40)) == 0x80) {
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/* 10xx xxxx */
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} else {
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goto fail;
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}
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num_cc--;
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} else {
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if (c < 0x80) {
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num_cc = 0;
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} else if ((c & (0x80 | 0x40 | 0x20)) == (0x80 | 0x40)) {
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/* 110x xxxx */
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num_cc = 1;
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} else if ((c & (0x80 | 0x40 | 0x20 | 0x10)) == (0x80 | 0x40 | 0x20)) {
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/* 1110 xxxx */
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num_cc = 2;
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} else if ((c & (0x80 | 0x40 | 0x20 | 0x10 | 0x08)) ==
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(0x80 | 0x40 | 0x20 | 0x10)) {
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/* 1111 0xxx */
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num_cc = 3;
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} else {
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goto fail;
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}
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}
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}
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if (num_cc != 0) {
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goto fail;
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}
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return true;
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fail:
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return false;
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}
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bool avb_str_concat(char* buf,
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size_t buf_size,
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const char* str1,
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size_t str1_len,
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const char* str2,
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size_t str2_len) {
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uint64_t combined_len;
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if (!avb_safe_add(&combined_len, str1_len, str2_len)) {
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avb_error("Overflow when adding string sizes.\n");
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return false;
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}
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if (combined_len > buf_size - 1) {
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avb_error("Insufficient buffer space.\n");
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return false;
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}
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avb_memcpy(buf, str1, str1_len);
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avb_memcpy(buf + str1_len, str2, str2_len);
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buf[combined_len] = '\0';
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return true;
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}
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void* avb_malloc(size_t size) {
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void* ret = avb_malloc_(size);
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if (ret == NULL) {
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avb_error("Failed to allocate memory.\n");
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return NULL;
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}
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return ret;
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}
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void* avb_calloc(size_t size) {
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void* ret = avb_malloc(size);
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if (ret == NULL) {
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return NULL;
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}
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avb_memset(ret, '\0', size);
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return ret;
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}
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char* avb_strdup(const char* str) {
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size_t len = avb_strlen(str);
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char* ret = avb_malloc(len + 1);
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if (ret == NULL) {
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return NULL;
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}
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avb_memcpy(ret, str, len);
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ret[len] = '\0';
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return ret;
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}
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const char* avb_strstr(const char* haystack, const char* needle) {
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size_t n, m;
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/* Look through |haystack| and check if the first character of
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* |needle| matches. If so, check the rest of |needle|.
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*/
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for (n = 0; haystack[n] != '\0'; n++) {
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if (haystack[n] != needle[0]) {
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continue;
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}
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for (m = 1;; m++) {
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if (needle[m] == '\0') {
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return haystack + n;
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}
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if (haystack[n + m] != needle[m]) {
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break;
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}
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}
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}
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return NULL;
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}
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const char* avb_strv_find_str(const char* const* strings,
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const char* str,
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size_t str_size) {
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size_t n;
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for (n = 0; strings[n] != NULL; n++) {
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if (avb_strlen(strings[n]) == str_size &&
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avb_memcmp(strings[n], str, str_size) == 0) {
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return strings[n];
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}
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}
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return NULL;
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}
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char* avb_replace(const char* str, const char* search, const char* replace) {
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char* ret = NULL;
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size_t ret_len = 0;
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size_t search_len, replace_len;
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const char* str_after_last_replace;
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search_len = avb_strlen(search);
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replace_len = avb_strlen(replace);
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str_after_last_replace = str;
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while (*str != '\0') {
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const char* s;
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size_t num_before;
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size_t num_new;
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s = avb_strstr(str, search);
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if (s == NULL) {
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break;
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}
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num_before = s - str;
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if (ret == NULL) {
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num_new = num_before + replace_len + 1;
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ret = avb_malloc(num_new);
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if (ret == NULL) {
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goto out;
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}
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avb_memcpy(ret, str, num_before);
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avb_memcpy(ret + num_before, replace, replace_len);
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ret[num_new - 1] = '\0';
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ret_len = num_new - 1;
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} else {
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char* new_str;
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num_new = ret_len + num_before + replace_len + 1;
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new_str = avb_malloc(num_new);
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if (new_str == NULL) {
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goto out;
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}
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avb_memcpy(new_str, ret, ret_len);
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avb_memcpy(new_str + ret_len, str, num_before);
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avb_memcpy(new_str + ret_len + num_before, replace, replace_len);
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new_str[num_new - 1] = '\0';
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avb_free(ret);
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ret = new_str;
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ret_len = num_new - 1;
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}
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str = s + search_len;
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str_after_last_replace = str;
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}
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if (ret == NULL) {
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ret = avb_strdup(str_after_last_replace);
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if (ret == NULL) {
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goto out;
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}
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} else {
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size_t num_remaining = avb_strlen(str_after_last_replace);
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size_t num_new = ret_len + num_remaining + 1;
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char* new_str = avb_malloc(num_new);
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if (new_str == NULL) {
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goto out;
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}
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avb_memcpy(new_str, ret, ret_len);
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avb_memcpy(new_str + ret_len, str_after_last_replace, num_remaining);
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new_str[num_new - 1] = '\0';
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avb_free(ret);
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ret = new_str;
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ret_len = num_new - 1;
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}
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out:
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return ret;
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}
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/* We only support a limited amount of strings in avb_strdupv(). */
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#define AVB_STRDUPV_MAX_NUM_STRINGS 32
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char* avb_strdupv(const char* str, ...) {
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va_list ap;
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const char* strings[AVB_STRDUPV_MAX_NUM_STRINGS];
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size_t lengths[AVB_STRDUPV_MAX_NUM_STRINGS];
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size_t num_strings, n;
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uint64_t total_length;
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char *ret = NULL, *dest;
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num_strings = 0;
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total_length = 0;
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va_start(ap, str);
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do {
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size_t str_len = avb_strlen(str);
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strings[num_strings] = str;
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lengths[num_strings] = str_len;
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if (!avb_safe_add_to(&total_length, str_len)) {
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avb_fatal("Overflow while determining total length.\n");
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break;
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}
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num_strings++;
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if (num_strings == AVB_STRDUPV_MAX_NUM_STRINGS) {
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avb_fatal("Too many strings passed.\n");
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break;
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}
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str = va_arg(ap, const char*);
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} while (str != NULL);
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va_end(ap);
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ret = avb_malloc(total_length + 1);
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if (ret == NULL) {
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goto out;
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}
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dest = ret;
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for (n = 0; n < num_strings; n++) {
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avb_memcpy(dest, strings[n], lengths[n]);
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dest += lengths[n];
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}
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*dest = '\0';
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avb_assert(dest == ret + total_length);
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out:
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return ret;
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}
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const char* avb_basename(const char* str) {
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int64_t n;
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size_t len;
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len = avb_strlen(str);
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if (len >= 2) {
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for (n = len - 2; n >= 0; n--) {
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if (str[n] == '/') {
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return str + n + 1;
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}
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}
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}
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return str;
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}
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void avb_uppercase(char* str) {
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size_t i;
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for (i = 0; str[i] != '\0'; ++i) {
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if (str[i] <= 0x7A && str[i] >= 0x61) {
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str[i] -= 0x20;
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}
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}
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}
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char* avb_bin2hex(const uint8_t* data, size_t data_len) {
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const char hex_digits[17] = "0123456789abcdef";
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char* hex_data;
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size_t n;
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hex_data = avb_malloc(data_len * 2 + 1);
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if (hex_data == NULL) {
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return NULL;
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}
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for (n = 0; n < data_len; n++) {
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hex_data[n * 2] = hex_digits[data[n] >> 4];
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hex_data[n * 2 + 1] = hex_digits[data[n] & 0x0f];
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}
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hex_data[n * 2] = '\0';
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return hex_data;
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}
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