Add support for parsing edid-decode text dumps

src/edid_parse.cpp

@@ -0,0 +1,120 @@
+#include <cstdlib>
+#include <cstdio>
+#include <vector>
+#include <sstream>
+
+#include <regex>
+
+extern "C"
+{
+#include <86box/86box.h>
+#include <86box/plat.h>    
+
+extern int ini_detect_bom(const char *fn);
+extern ssize_t local_getline(char **buf, size_t *bufsiz, FILE *fp);
+}
+
+// https://stackoverflow.com/a/64886763
+static std::vector<std::string> split(const std::string str, const std::string regex_str)
+{
+    std::regex regexz(regex_str);
+    std::vector<std::string> list(std::sregex_token_iterator(str.begin(), str.end(), regexz, -1),
+                                  std::sregex_token_iterator());
+    return list;
+}
+
+extern "C"
+{
+    bool parse_edid_decode_file(const char* path, uint8_t* out, ssize_t* size_out) 
+    {
+        std::regex regexLib("^([a-f0-9]{32}|[a-f0-9 ]{47})$", std::regex_constants::egrep);
+        FILE* file;
+        pclog("Parse %s\n", path);
+        try {
+            bool bom = ini_detect_bom(path);
+            {
+                // First check for "edid-decode (hex)" string.
+                file = plat_fopen(path, "rb");
+                if (file) {
+                    std::string str;
+                    size_t size;
+                    if (!fseek(file, 0, SEEK_END)) {
+                        size = ftell(file);
+                        if (size != -1) {
+                            str.resize(size);
+                        }
+                        fseek(file, 0, SEEK_SET);
+                        auto read = fread((void*)str.data(), 1, size, file);
+                        str.resize(read);
+                        fclose(file);
+                        file = NULL;
+
+                        if (str.size() == 0) {
+                            return false;
+                        }
+
+                        if (str.find("edid-decode") == std::string::npos) {
+                            return false;
+                        }
+                    }
+                } else {
+                    return false;
+                }
+            }
+            file = plat_fopen(path, "rb");
+            if (file) {
+                char* buf = NULL;
+                size_t size = 0;
+                std::string edid_decode_text;
+                fseek(file, 0, SEEK_END);
+                size = ftell(file);
+                fseek(file, 0, SEEK_SET);
+                if (bom) {
+                    fseek(file, 3, SEEK_SET);
+                    size -= 3;
+                }
+                edid_decode_text.resize(size);
+                auto err = fread((void*)edid_decode_text.data(), size, 1, file);
+                fclose(file);
+                file = NULL;
+                if (err == 0) {
+                    return false;
+                }
+                std::istringstream isstream(edid_decode_text);
+                std::string line;
+                std::string edid;
+                while (std::getline(isstream, line)) {
+                    if (line[line.size() - 1] == '\r') {
+                        line.resize(line.size() - 1);
+                    }
+                    std::smatch matched;
+                    if (std::regex_match(line, matched, regexLib)) {
+                        edid.append(matched.str() + " ");
+                    }
+                }
+                if (edid.size() >= 3) {
+                    edid.resize(edid.size() - 1);
+                    auto vals = split(edid, "\\s+");
+                    if (vals.size()) {
+                        *size_out = vals.size();
+                        if (vals.size() > 256)
+                            return false;
+                        for (int i = 0; i < vals.size(); i++) {
+                            out[i] = (uint8_t)std::strtoul(&vals[i][0], nullptr, 16);
+                        }
+                        return true;
+                    }
+                }
+            }
+
+            return false;
+        } catch (std::bad_alloc&) {
+            if (file) {
+                fclose(file);
+                file = NULL;
+            }
+            return false;
+        }
+        return false;
+    }
+}