535 lines
10 KiB
C
535 lines
10 KiB
C
// SPDX-License-Identifier: LGPL-3.0-only
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#include "rz_types.h"
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#include "rz_util.h"
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#include <stdio.h>
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#include <ctype.h>
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/* int c; ret = hex_to_byte(&c, 'c'); */
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RZ_API bool rz_hex_to_byte(ut8 *val, ut8 c) {
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if (IS_DIGIT(c)) {
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*val = (ut8)(*val) * 16 + (c - '0');
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} else if (c >= 'A' && c <= 'F') {
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*val = (ut8)(*val) * 16 + (c - 'A' + 10);
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} else if (c >= 'a' && c <= 'f') {
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*val = (ut8)(*val) * 16 + (c - 'a' + 10);
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} else {
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return 1;
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}
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return 0;
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}
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RZ_API char *rz_hex_from_py_str(char *out, const char *code) {
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if (!strncmp(code, "'''", 3)) {
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const char *s = code + 2;
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return rz_hex_from_c_str(out, &s);
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}
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return rz_hex_from_c_str(out, &code);
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}
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static const char *skip_comment_py(const char *code) {
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if (*code != '#') {
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return code;
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}
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char *end = strchr(code, '\n');
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if (end) {
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code = end;
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}
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return code + 1;
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}
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RZ_API char *rz_hex_from_py_array(char *out, const char *code) {
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const char abc[] = "0123456789abcdef";
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if (*code != '[' || !strchr(code, ']')) {
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return NULL;
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}
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code++;
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for (; *code; code++) {
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char *comma = strchr(code, ',');
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if (!comma) {
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comma = strchr(code, ']');
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}
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if (!comma) {
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break;
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}
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char *_word = rz_str_ndup(code, comma - code);
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const char *word = _word;
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while (*word == ' ' || *word == '\t' || *word == '\n') {
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word++;
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word = skip_comment_py(word);
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}
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if (IS_DIGIT(*word)) {
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ut8 n = (ut8)rz_num_math(NULL, word);
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*out++ = abc[(n >> 4) & 0xf];
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*out++ = abc[n & 0xf];
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}
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free(_word);
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code = comma;
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if (*code == ']') {
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break;
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}
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}
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return out;
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}
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RZ_API char *rz_hex_from_py(const char *code) {
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if (!code) {
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return NULL;
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}
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char *const ret = malloc(strlen(code) * 3);
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if (!ret) {
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return NULL;
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}
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*ret = '\0';
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char *out = ret;
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const char *tmp_code = strchr(code, '=');
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if (tmp_code) {
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code = tmp_code;
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}
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for (; *code && *code != '[' && *code != '\'' && *code != '"'; code++) {
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code = skip_comment_py(code);
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}
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if (*code == '[') {
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out = rz_hex_from_py_array(out, code);
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} else if (*code == '"' || *code == '\'') {
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out = rz_hex_from_py_str(out, code);
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}
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if (!out) {
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free(ret);
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return NULL;
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}
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*out = '\0';
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return ret;
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}
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RZ_API char *rz_hex_from_c_str(char *out, const char **code) {
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const char abc[] = "0123456789abcdefABCDEF";
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const char *iter = *code;
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if (*iter != '\'' && *iter != '"') {
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return NULL;
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}
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const char end_char = *iter;
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iter++;
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for (; *iter && *iter != end_char; iter++) {
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if (*iter == '\\') {
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iter++;
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switch (iter[0]) {
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case 'e':
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*out++ = '1';
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*out++ = 'b';
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break;
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case 'r':
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*out++ = '0';
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*out++ = 'd';
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break;
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case 'n':
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*out++ = '0';
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*out++ = 'a';
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break;
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case 'x': {
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ut8 c1 = iter[1];
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ut8 c2 = iter[2];
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iter += 2;
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if (c1 == '\0' || c2 == '\0') {
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return NULL;
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} else if (strchr(abc, c1) && strchr(abc, c2)) {
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*out++ = tolower(c1);
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*out++ = tolower(c2);
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} else {
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return NULL;
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}
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break;
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}
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default:
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if (iter[0] == end_char) {
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*out++ = abc[*iter >> 4];
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*out++ = abc[*iter & 0xf];
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}
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return NULL;
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}
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} else {
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*out++ = abc[*iter >> 4];
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*out++ = abc[*iter & 0xf];
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}
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}
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*code = iter;
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return out;
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}
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const char *skip_comment_c(const char *code) {
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if (!strncmp(code, "/*", 2)) {
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char *end = strstr(code, "*/");
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if (end) {
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code = end + 2;
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} else {
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eprintf("Missing closing comment\n");
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}
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} else if (!strncmp(code, "//", 2)) {
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char *end = strchr(code, '\n');
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if (end) {
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code = end + 2;
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}
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}
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return code;
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}
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RZ_API char *rz_hex_from_c_array(char *out, const char *code) {
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const char abc[] = "0123456789abcdef";
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if (*code != '{' || !strchr(code, '}')) {
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return NULL;
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}
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code++;
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for (; *code; code++) {
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const char *comma = strchr(code, ',');
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if (!comma) {
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comma = strchr(code, '}');
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}
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char *_word = rz_str_ndup(code, comma - code);
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const char *word = _word;
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word = skip_comment_c(word);
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while (*word == ' ' || *word == '\t' || *word == '\n') {
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word++;
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word = skip_comment_c(word);
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}
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if (IS_DIGIT(*word)) {
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ut8 n = (ut8)rz_num_math(NULL, word);
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*out++ = abc[(n >> 4) & 0xf];
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*out++ = abc[n & 0xf];
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}
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free(_word);
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code = comma;
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if (*code == '}') {
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break;
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}
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}
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return out;
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}
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/* convert:
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* char *foo = "\x41\x23\x42\x1b";
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* into:
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* 4123421b
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*/
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RZ_API char *rz_hex_from_c(const char *code) {
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if (!code) {
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return NULL;
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}
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char *const ret = malloc(strlen(code) * 3);
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if (!ret) {
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return NULL;
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}
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*ret = '\0';
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char *out = ret;
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const char *tmp_code = strchr(code, '=');
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if (tmp_code) {
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code = tmp_code;
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}
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for (; *code != '\0' && *code != '{' && *code != '"'; code++) {
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code = skip_comment_c(code);
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}
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if (*code == '{') {
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out = rz_hex_from_c_array(out, code);
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} else if (*code == '"') {
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const char *s1, *s2;
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s1 = code;
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do {
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code = s1;
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out = rz_hex_from_c_str(out, &code);
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if (!out) {
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break;
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}
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s1 = strchr(code + 1, '"');
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s2 = strchr(code + 1, ';');
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} while (s1 && s2 && (s1 <= s2));
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}
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if (!out) {
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free(ret);
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return NULL;
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}
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*out = '\0';
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return ret;
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}
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RZ_API char *rz_hex_from_js(const char *code) {
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char *s1 = strchr(code, '\'');
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char *s2 = strchr(code, '"');
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/* there are no strings in the input */
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if (!(s1 || s2)) {
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return NULL;
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}
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char *start, *end;
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if (s1 < s2) {
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start = s1;
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end = strchr(start + 1, '\'');
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} else {
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start = s2;
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end = strchr(start + 1, '"');
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}
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/* the string isn't properly terminated */
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if (!end) {
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return NULL;
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}
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char *str = rz_str_ndup(start + 1, end - start - 1);
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/* assuming base64 input, output will always be shorter */
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ut8 *b64d = malloc(end - start);
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if (!b64d) {
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free(str);
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return NULL;
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}
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rz_base64_decode(b64d, str, end - start - 1);
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if (!b64d) {
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free(str);
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free(b64d);
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return NULL;
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}
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// TODO: use rz_str_bin2hex
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int i, len = strlen((const char *)b64d);
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char *out = malloc(len * 2 + 1);
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if (!out) {
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free(str);
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free(b64d);
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return NULL;
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}
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for (i = 0; i < len; i++) {
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sprintf(&out[i * 2], "%02x", b64d[i]);
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}
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out[len * 2] = '\0';
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free(str);
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free(b64d);
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return out;
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}
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/* convert
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* "\x41\x23\x42\x1b"
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* "\x41\x23\x42\x1b"
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* into
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* 4123421b4123421b
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*/
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RZ_API char *rz_hex_no_code(const char *code) {
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if (!code) {
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return NULL;
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}
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char *const ret = calloc(1, strlen(code) * 3);
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if (!ret) {
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return NULL;
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}
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*ret = '\0';
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char *out = ret;
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out = rz_hex_from_c_str(out, &code);
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code = strchr(code + 1, '"');
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if (!out) {
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free(ret);
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return NULL;
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}
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*out = '\0';
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while (out && code) {
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*out = '\0';
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out = rz_hex_from_c_str(out, &code);
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code = strchr(code + 1, '"');
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}
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return ret;
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}
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RZ_API char *rz_hex_from_code(const char *code) {
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if (!strchr(code, '=')) {
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return rz_hex_no_code(code);
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}
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/* C language */
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if (strstr(code, "char") || strstr(code, "int")) {
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return rz_hex_from_c(code);
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}
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/* JavaScript */
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if (strstr(code, "var")) {
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return rz_hex_from_js(code);
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}
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/* Python */
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return rz_hex_from_py(code);
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}
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/* int byte = hexpair2bin("A0"); */
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// (0A) => 10 || -1 (on error)
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RZ_API int rz_hex_pair2bin(const char *arg) {
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ut8 *ptr, c = 0, d = 0;
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ut32 j = 0;
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for (ptr = (ut8 *)arg;; ptr = ptr + 1) {
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if (!*ptr || *ptr == ' ' || j == 2) {
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break;
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}
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d = c;
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if (*ptr != '.' && rz_hex_to_byte(&c, *ptr)) {
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eprintf("Invalid hexa string at char '%c' (%s).\n",
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*ptr, arg);
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return -1;
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}
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c |= d;
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if (j++ == 0) {
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c <<= 4;
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}
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}
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return (int)c;
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}
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RZ_API int rz_hex_bin2str(const ut8 *in, int len, char *out) {
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int i, idx;
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char tmp[8];
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if (len < 0) {
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return 0;
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}
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for (idx = i = 0; i < len; i++, idx += 2) {
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snprintf(tmp, sizeof(tmp), "%02x", in[i]);
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memcpy(out + idx, tmp, 2);
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}
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out[idx] = 0;
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return len;
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}
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RZ_API char *rz_hex_bin2strdup(const ut8 *in, int len) {
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int i, idx;
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char tmp[5], *out;
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if ((len + 1) * 2 < len) {
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return NULL;
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}
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out = malloc((len + 1) * 2);
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if (!out) {
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return NULL;
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}
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for (i = idx = 0; i < len; i++, idx += 2) {
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snprintf(tmp, sizeof(tmp), "%02x", in[i]);
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memcpy(out + idx, tmp, 2);
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}
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out[idx] = 0;
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return out;
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}
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RZ_API int rz_hex_str2bin(const char *in, ut8 *out) {
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long nibbles = 0;
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while (in && *in) {
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ut8 tmp;
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/* skip hex prefix */
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if (*in == '0' && in[1] == 'x') {
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in += 2;
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}
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/* read hex digits */
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while (!rz_hex_to_byte(out ? &out[nibbles / 2] : &tmp, *in)) {
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nibbles++;
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in++;
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}
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if (*in == '\0') {
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break;
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}
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/* comments */
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if (*in == '#' || (*in == '/' && in[1] == '/')) {
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if ((in = strchr(in, '\n'))) {
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in++;
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}
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continue;
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} else if (*in == '/' && in[1] == '*') {
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if ((in = strstr(in, "*/"))) {
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in += 2;
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}
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continue;
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} else if (!IS_WHITESPACE(*in) && *in != '\n') {
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/* this is not a valid string */
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return 0;
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}
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/* ignore character */
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in++;
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}
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if (nibbles % 2) {
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if (out) {
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rz_hex_to_byte(&out[nibbles / 2], '0');
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}
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return -(nibbles + 1) / 2;
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}
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return nibbles / 2;
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}
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RZ_API int rz_hex_str2binmask(const char *in, ut8 *out, ut8 *mask) {
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ut8 *ptr;
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int len, ilen = strlen(in) + 1;
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int has_nibble = 0;
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memcpy(out, in, ilen);
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for (ptr = out; *ptr; ptr++) {
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if (*ptr == '.') {
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*ptr = '0';
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}
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}
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len = rz_hex_str2bin((char *)out, out);
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if (len < 0) {
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has_nibble = 1;
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len = -(len + 1);
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}
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if (len != -1) {
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memcpy(mask, in, ilen);
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if (has_nibble) {
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memcpy(mask + ilen, "f0", 3);
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}
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for (ptr = mask; *ptr; ptr++) {
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if (IS_HEXCHAR(*ptr)) {
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*ptr = 'f';
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} else if (*ptr == '.') {
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*ptr = '0';
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}
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}
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len = rz_hex_str2bin((char *)mask, mask);
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if (len < 0) {
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len++;
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}
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}
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return len;
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}
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RZ_API st64 rz_hex_bin_truncate(ut64 in, int n) {
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switch (n) {
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case 1:
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if ((in & UT8_GT0)) {
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return UT64_8U | in;
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}
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return in & UT8_MAX;
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case 2:
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if ((in & UT16_GT0)) {
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return UT64_16U | in;
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}
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return in & UT16_MAX;
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case 4:
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if ((in & UT32_GT0)) {
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return UT64_32U | in;
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}
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return in & UT32_MAX;
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case 8:
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return in & UT64_MAX;
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}
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return in;
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}
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// Check if str contains only hexadecimal characters and return length of bytes
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RZ_API int rz_hex_str_is_valid(const char *str) {
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int i;
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int len = 0;
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if (!strncmp(str, "0x", 2)) {
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str += 2;
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}
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for (i = 0; str[i] != '\0'; i++) {
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if (IS_HEXCHAR(str[i])) {
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len++;
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}
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if (IS_HEXCHAR(str[i]) || IS_WHITESPACE(str[i])) {
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continue;
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}
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return -1; //if we're here, then str isn't valid
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}
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return len;
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}
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