mirror of
https://github.com/radareorg/radare2.git
synced 2024-12-03 19:01:31 +00:00
499 lines
9.9 KiB
C
499 lines
9.9 KiB
C
/* radare - LGPL - Copyright 2007-2016 - pancake */
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#include "r_types.h"
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#include "r_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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R_API int r_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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R_API char *r_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 r_hex_from_c_str (out, &s);
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}
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return r_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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R_API char *r_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 = r_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)r_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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R_API char* r_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 != '\''
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&& *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 = r_hex_from_py_array (out, code);
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} else if (*code == '"' || *code == '\'') {
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out = r_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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R_API char *r_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': *out++='1';*out++='b';break;
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case 'r': *out++='0';*out++='d';break;
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case 'n': *out++='0';*out++='a';break;
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case 'x': {
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char c1 = iter[1];
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char 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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R_API char *r_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 = r_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)r_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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R_API char *r_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 = r_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 = r_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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R_API char *r_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 = r_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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r_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 r_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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R_API char *r_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 = 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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out = r_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 = r_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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R_API char *r_hex_from_code(const char *code) {
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if (!strchr (code, '=')) {
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return r_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 r_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 r_hex_from_js (code);
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}
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/* Python */
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return r_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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R_API int r_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!='.' && r_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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R_API int r_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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R_API char *r_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) return NULL;
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out = malloc ((len + 1) * 2);
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if (!out) return NULL;
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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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R_API int r_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 (!r_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) r_hex_to_byte (&out[nibbles/2], '0');
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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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R_API int r_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++) if (*ptr=='.') *ptr = '0';
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len = r_hex_str2bin ((char*)out, out);
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if (len<0) { has_nibble = 1; len = -(len+1); }
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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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for (ptr=mask; *ptr; ptr++) *ptr = (*ptr=='.')?'0':'f';
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len = r_hex_str2bin ((char*)mask, mask);
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if (len<0) len++;
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}
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return len;
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}
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R_API st64 r_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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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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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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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 hexademical characters and return length of bytes
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R_API int r_hex_str_is_valid(const char* str) {
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int i;
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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' && str[i] != ' '; i++) {
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if (IS_HEXCHAR (str[i])) {
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continue;
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}
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return -1; //if we're here, then str isnt valid
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}
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return i;
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}
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