1"use strict";(self.webpackChunk_N_E=self.webpackChunk_N_E||[]).push([[1093],{31093:(e,t,r)=>{r.r(t),r.d(t,{default:()=>i,frontmatter:()=>s});var n=r(95155),o=r(5674);r(88145),r(88482),r(49026),r(34964);let s={title:"EOT to SVG Converter: Embedded OpenType to Vector Graphics Extraction",description:"Specialized EOT to SVG converter for legacy IE font format transformation. Extract and convert Embedded OpenType fonts to modern SVG paths with compression handling.",keywords:["EOT to SVG","Embedded OpenType converter","IE font format","legacy font conversion","MTX compression","web font migration"],author:"SVG AI Team",date:"2025-01-17",category:"Typography Converters",subcategory:"Legacy Formats",featured:!1,views:0,likes:0};function a(e){let t={h1:"h1",h2:"h2",h3:"h3",p:"p",...(0,o.R)(),...e.components},{EOTToSVGConverter:r,FAQSection:s,RelatedConverters:a}=t;return r||c("EOTToSVGConverter",!0),s||c("FAQSection",!0),a||c("RelatedConverters",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(t.h1,{children:"EOT to SVG Converter: Legacy Font Format Transformation"}),"\n",(0,n.jsx)(t.h2,{children:"Understanding Embedded OpenType"}),"\n",(0,n.jsx)(t.p,{children:"Embedded OpenType (EOT) represents a pivotal moment in web typography historyâMicrosoft's proprietary solution for web font delivery in Internet Explorer. Created in the late 1990s, EOT files wrap TrueType or OpenType fonts with proprietary compression (MTX) and optional subsetting, including URL binding for rudimentary DRM. While obsolete in modern web development, converting EOT to SVG enables recovery of legacy web fonts and migration to contemporary formats."}),"\n",(0,n.jsx)(r,{}),"\n",(0,n.jsx)(t.h2,{children:"EOT File Structure Deep Dive"}),"\n",(0,n.jsx)(t.h3,{children:"The Proprietary Container"}),"\n",(0,n.jsx)(t.p,{children:"EOT's structure reflects Microsoft's early approach to web font security:"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// EOT header structure analysis 2class EOTParser { 3constructor(buffer) { 4 this.data = new DataView(buffer); 5 this.offset = 0; 6} 7 8parseEOTHeader() { 9 const header = { 10 // Fixed header 11 EOTSize: this.readUInt32LE(), 12 FontDataSize: this.readUInt32LE(), 13 Version: this.readUInt32LE(), 14 Flags: this.readUInt32LE(), 15 16 // Font panose and metrics 17 FontPANOSE: this.readBytes(10), 18 Charset: this.readByte(), 19 Italic: this.readByte(), 20 Weight: this.readUInt32LE(), 21 fsType: this.readUInt16LE(), 22 MagicNumber: this.readUInt16LE(), // Should be 0x504C 23 24 // Unicode ranges (OS/2 table data) 25 UnicodeRange1: this.readUInt32LE(), 26 UnicodeRange2: this.readUInt32LE(), 27 UnicodeRange3: this.readUInt32LE(), 28 UnicodeRange4: this.readUInt32LE(), 29 30 // Code page ranges 31 CodePageRange1: this.readUInt32LE(), 32 CodePageRange2: this.readUInt32LE(), 33 34 // Checksum and padding 35 CheckSumAdjustment: this.readUInt32LE(), 36 Reserved: this.readBytes(16), 37 38 // Padding to 16-byte boundary 39 Padding1: this.readUInt16LE() 40 }; 41 42 // Variable-length data 43 header.FamilyName = this.readUnicodeString(); 44 header.StyleName = this.readUnicodeString(); 45 header.VersionName = this.readUnicodeString(); 46 header.FullName = this.readUnicodeString(); 47 48 // Optional root string (URL binding) 49 if (header.Flags & 0x0001) { 50 header.RootString = this.readUnicodeString(); 51 } 52 53 return header; 54} 55 56readUnicodeString() { 57 const length = this.readUInt16LE(); 58 const bytes = this.readBytes(length); 59 60 // EOT uses UTF-16LE encoding 61 let string = ''; 62 for (let i = 0; i < bytes.length; i += 2) { 63 string += String.fromCharCode(bytes[i] | (bytes[i + 1] << 8)); 64 } 65 66 // Align to 4-byte boundary 67 const padding = (4 - ((length + 2) % 4)) % 4; 68 this.offset += padding; 69 70 return string; 71} 72}`}),"\n",(0,n.jsx)(t.h3,{children:"MTX Compression Algorithm"}),"\n",(0,n.jsx)(t.p,{children:"EOT uses Microsoft's proprietary MTX compression:"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// MTX decompression implementation 73class MTXDecompressor { 74decompress(compressedData, uncompressedSize) { 75 const output = new Uint8Array(uncompressedSize); 76 let inputPos = 0; 77 let outputPos = 0; 78 79 while (outputPos < uncompressedSize && inputPos < compressedData.length) { 80 const controlByte = compressedData[inputPos++]; 81 82 for (let bit = 0; bit < 8 && outputPos < uncompressedSize; bit++) { 83 if (controlByte & (1 << bit)) { 84 // Literal byte 85 output[outputPos++] = compressedData[inputPos++]; 86 } else { 87 // LZ77 reference 88 if (inputPos + 1 >= compressedData.length) break; 89 90 const byte1 = compressedData[inputPos++]; 91 const byte2 = compressedData[inputPos++]; 92 93 // Extract offset and length 94 const offset = ((byte2 & 0xF0) << 4) | byte1; 95 const length = (byte2 & 0x0F) + 3; 96 97 // Copy from previous output 98 for (let i = 0; i < length && outputPos < uncompressedSize; i++) { 99 output[outputPos] = output[outputPos - offset]; 100 outputPos++; 101 } 102 } 103 } 104 } 105 106 return output; 107} 108 109// Alternative: Handle uncompressed EOT 110handleUncompressed(eotData) { 111 const header = this.parseEOTHeader(eotData); 112 113 if (header.Flags & 0x0004) { 114 // Font data is not compressed 115 const fontStart = this.calculateFontDataOffset(header); 116 return eotData.slice(fontStart, fontStart + header.FontDataSize); 117 } else { 118 // Apply MTX decompression 119 const compressed = eotData.slice( 120 this.calculateFontDataOffset(header) 121 ); 122 return this.decompress(compressed, header.FontDataSize); 123 } 124} 125}`}),"\n",(0,n.jsx)(t.h2,{children:"Font Extraction and Reconstruction"}),"\n",(0,n.jsx)(t.h3,{children:"Recovering the Original Font"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Font reconstruction from EOT 126class FontReconstructor { 127reconstructFromEOT(eotData) { 128 // Parse EOT header 129 const eotHeader = new EOTParser(eotData).parseEOTHeader(); 130 131 // Extract and decompress font data 132 const decompressor = new MTXDecompressor(); 133 const fontData = decompressor.handleUncompressed(eotData); 134 135 // Determine font type 136 const fontType = this.identifyFontType(fontData); 137 138 // Reconstruct font tables 139 if (fontType === 'TrueType') { 140 return this.reconstructTrueType(fontData, eotHeader); 141 } else if (fontType === 'OpenType') { 142 return this.reconstructOpenType(fontData, eotHeader); 143 } 144 145 throw new Error('Unknown font type in EOT'); 146} 147 148identifyFontType(fontData) { 149 const signature = new DataView(fontData.buffer).getUint32(0); 150 151 if (signature === 0x00010000 || signature === 0x74727565) { 152 return 'TrueType'; 153 } else if (signature === 0x4F54544F) { 154 return 'OpenType'; 155 } 156 157 return 'Unknown'; 158} 159 160reconstructTrueType(fontData, eotHeader) { 161 // Parse TrueType tables 162 const ttf = new TrueTypeParser(fontData); 163 const tables = ttf.parseTables(); 164 165 // Restore metadata from EOT header 166 this.restoreMetadata(tables, eotHeader); 167 168 // Rebuild font 169 return { 170 type: 'TrueType', 171 tables: tables, 172 glyphs: this.extractGlyphs(tables), 173 metrics: this.extractMetrics(tables, eotHeader) 174 }; 175} 176 177restoreMetadata(tables, eotHeader) {
178 // Restore name table entries from EOT header 179 if (!tables.name) { 180 tables.name = this.createNameTable(); 181 } 182 183 // Add EOT metadata to name table 184 this.addNameEntry(tables.name, 1, eotHeader.FamilyName); // Family 185 this.addNameEntry(tables.name, 2, eotHeader.StyleName); // Style 186 this.addNameEntry(tables.name, 4, eotHeader.FullName); // Full name 187 this.addNameEntry(tables.name, 5, eotHeader.VersionName); // Version 188 189 // Restore OS/2 table data 190 if (tables.OS2) { 191 tables.OS2.panose = eotHeader.FontPANOSE; 192 tables.OS2.usWeightClass = eotHeader.Weight; 193 tables.OS2.fsType = eotHeader.fsType; 194 tables.OS2.ulUnicodeRange1 = eotHeader.UnicodeRange1; 195 tables.OS2.ulUnicodeRange2 = eotHeader.UnicodeRange2; 196 tables.OS2.ulUnicodeRange3 = eotHeader.UnicodeRange3; 197 tables.OS2.ulUnicodeRange4 = eotHeader.UnicodeRange4; 198 } 199} 200}`}),"\n",(0,n.jsx)(t.h2,{children:"Handling URL Binding and DRM"}),"\n",(0,n.jsx)(t.h3,{children:"Extracting Root Strings"}),"\n",(0,n.jsx)(t.p,{children:"EOT's URL binding mechanism for rudimentary DRM:"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// URL binding extraction and documentation 201class EOTSecurity { 202extractSecurityInfo(eotData) { 203 const header = new EOTParser(eotData).parseEOTHeader(); 204 const security = { 205 hasRootString: !!(header.Flags & 0x0001), 206 rootString: null, 207 isSubsetted: !!(header.Flags & 0x0002), 208 permissions: this.parsePermissions(header.fsType) 209 }; 210 211 if (security.hasRootString) { 212 security.rootString = header.RootString; 213 security.allowedDomains = this.parseRootString(header.RootString); 214 } 215 216 return security; 217} 218 219parseRootString(rootString) { 220 // Root strings can contain multiple URLs separated by spaces 221 const urls = rootString.split(/s+/); 222 const domains = []; 223 224 urls.forEach(url => { 225 try { 226 const parsed = new URL(url); 227 domains.push({ 228 protocol: parsed.protocol, 229 hostname: parsed.hostname, 230 pathname: parsed.pathname || '/', 231 original: url 232 }); 233 } catch (e) { 234 // Handle malformed URLs 235 domains.push({ 236 pattern: url, 237 original: url 238 }); 239 } 240 }); 241 242 return domains; 243} 244 245parsePermissions(fsType) { 246 return { 247 installable: fsType === 0x0000, 248 restricted: !!(fsType & 0x0002), 249 previewPrint: !!(fsType & 0x0004), 250 editable: !!(fsType & 0x0008), 251 noSubsetting: !!(fsType & 0x0100), 252 bitmapOnly: !!(fsType & 0x0200) 253 }; 254} 255 256// Generate security report for converted font 257generateSecurityReport(security) { 258 const report = []; 259 260 if (security.hasRootString) { 261 report.push('â ï¸ URL Binding Detected:'); 262 security.allowedDomains.forEach(domain => { 263 report.push(\` - \${domain.original}\`); 264 }); 265 } 266 267 if (security.permissions.restricted) { 268 report.push('ð Restricted License: Embedding not permitted'); 269 } 270 271 if (security.permissions.noSubsetting) { 272 report.push('ð No Subsetting: Full font must be embedded'); 273 } 274 275 return report.join(' 276'); 277} 278}`}),"\n",(0,n.jsx)(t.h2,{children:"Character Subset Recovery"}),"\n",(0,n.jsx)(t.h3,{children:"Reconstructing Full Character Sets"}),"\n",(0,n.jsx)(t.p,{children:"EOT files often contain subsetted fonts:"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Subset analysis and recovery 279class SubsetAnalyzer { 280analyzeSubset(eotFont) { 281 const analysis = { 282 isSubsetted: false, 283 includedRanges: [], 284 missingRanges: [], 285 coverage: 0 286 }; 287 288 // Check if font is subsetted 289 if (eotFont.header.Flags & 0x0002) { 290 analysis.isSubsetted = true; 291 } 292 293 // Analyze Unicode coverage 294 const ranges = this.parseUnicodeRanges(eotFont.header); 295 const cmap = eotFont.tables.cmap; 296 297 ranges.forEach(range => { 298 let included = 0; 299 let total = range.end - range.start + 1; 300 301 for (let code = range.start; code <= range.end; code++) { 302 if (cmap && cmap[code]) { 303 included++; 304 } 305 } 306 307 if (included === total) { 308 analysis.includedRanges.push(range); 309 } else if (included === 0) { 310 analysis.missingRanges.push(range); 311 } else { 312 analysis.includedRanges.push({ 313 ...range, 314 partial: true, 315 coverage: included / total 316 }); 317 } 318 }); 319 320 // Calculate overall coverage 321 const totalPossible = this.calculateTotalCharacters(ranges); 322 const totalIncluded = this.countIncludedCharacters(cmap); 323 analysis.coverage = totalIncluded / totalPossible; 324 325 return analysis; 326} 327 328parseUnicodeRanges(header) { 329 const ranges = []; 330 const bits = [ 331 header.UnicodeRange1, 332 header.UnicodeRange2, 333 header.UnicodeRange3, 334 header.UnicodeRange4 335 ]; 336 337 // Map OS/2 Unicode range bits to actual ranges 338 const unicodeRanges = [ 339 { bit: 0, start: 0x0020, end: 0x007E, name: 'Basic Latin' }, 340 { bit: 1, start: 0x0080, end: 0x00FF, name: 'Latin-1 Supplement' }, 341 { bit: 2, start: 0x0100, end: 0x017F, name: 'Latin Extended-A' }, 342 { bit: 3, start: 0x0180, end: 0x024F, name: 'Latin Extended-B' }, 343 { bit: 4, start: 0x0250, end: 0x02AF, name: 'IPA Extensions' }, 344 { bit: 5, start: 0x02B0, end: 0x02FF, name: 'Spacing Modifiers' }, 345 { bit: 6, start: 0x0300, end: 0x036F, name: 'Combining Diacritical' }, 346 { bit: 7, start: 0x0370, end: 0x03FF, name: 'Greek and Coptic' }, 347 // ... continue for all 128 bits 348 ]; 349
350 unicodeRanges.forEach(range => { 351 const dwordIndex = Math.floor(range.bit / 32); 352 const bitIndex = range.bit % 32; 353 354 if (bits[dwordIndex] & (1 << bitIndex)) { 355 ranges.push(range); 356 } 357 }); 358 359 return ranges; 360} 361 362// Attempt to recover missing glyphs 363recoverMissingGlyphs(font, missingRanges) { 364 const recovered = []; 365 366 missingRanges.forEach(range => { 367 if (range.name === 'Basic Latin') { 368 // Generate basic ASCII glyphs if missing 369 for (let code = range.start; code <= range.end; code++) { 370 if (!font.glyphs[code]) { 371 recovered.push({ 372 unicode: code, 373 char: String.fromCharCode(code), 374 synthetic: true, 375 glyph: this.generateSyntheticGlyph(code) 376 }); 377 } 378 } 379 } 380 }); 381 382 return recovered; 383} 384}`}),"\n",(0,n.jsx)(t.h2,{children:"Legacy Browser Compatibility"}),"\n",(0,n.jsx)(t.h3,{children:"Historical Context Preservation"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Document EOT's historical context 385class EOTHistoryDocumenter { 386generateCompatibilityReport(eotData) { 387 const report = { 388 format: 'Embedded OpenType (EOT)', 389 created: this.estimateCreationDate(eotData), 390 targetBrowser: 'Internet Explorer 4.0+', 391 compressionType: 'MTX (MicroType Express)', 392 features: [], 393 limitations: [], 394 modernAlternatives: [] 395 }; 396 397 // Analyze EOT features 398 const header = new EOTParser(eotData).parseEOTHeader(); 399 400 if (header.Version === 0x00010000) { 401 report.version = 'EOT Version 1.0'; 402 } else if (header.Version === 0x00020001) { 403 report.version = 'EOT Version 2.0 (with subsetting)'; 404 } else if (header.Version === 0x00020002) { 405 report.version = 'EOT Version 2.1 (with EUDC)'; 406 } 407 408 // Document features 409 if (header.Flags & 0x0001) { 410 report.features.push('URL binding for domain restriction'); 411 } 412 if (header.Flags & 0x0002) { 413 report.features.push('Font subsetting enabled'); 414 } 415 if (header.Flags & 0x0004) { 416 report.features.push('Uncompressed font data'); 417 } 418 419 // Document limitations 420 report.limitations = [ 421 'Internet Explorer exclusive format', 422 'Proprietary compression algorithm', 423 'Limited to TrueType/OpenType fonts', 424 'No support for color fonts or variable fonts', 425 'URL binding easily circumvented' 426 ]; 427 428 // Suggest modern alternatives 429 report.modernAlternatives = [ 430 { format: 'WOFF2', reason: 'Better compression, universal support' }, 431 { format: 'WOFF', reason: 'Wide browser support, standard format' }, 432 { format: 'Variable Fonts', reason: 'Multiple weights in single file' } 433 ]; 434 435 return report; 436} 437 438estimateCreationDate(eotData) { 439 // EOT was primarily used between 1997-2010 440 const header = new EOTParser(eotData).parseEOTHeader(); 441 442 if (header.Version === 0x00010000) { 443 return 'Likely 1997-2003 (EOT 1.0 era)'; 444 } else if (header.Version === 0x00020001) { 445 return 'Likely 2003-2008 (EOT 2.0 era)'; 446 } else { 447 return 'Likely 2008-2012 (Late EOT era)'; 448 } 449} 450}`}),"\n",(0,n.jsx)(t.h2,{children:"Conversion to Modern SVG"}),"\n",(0,n.jsx)(t.h3,{children:"Optimized Path Generation"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// EOT to SVG conversion pipeline 451class EOTToSVGPipeline { 452async convert(eotData, options = {}) { 453 const { 454 preserveHinting = false, 455 generateFallbacks = true, 456 embedMetadata = true, 457 optimizePaths = true 458 } = options; 459 460 // Step 1: Extract font from EOT 461 const reconstructor = new FontReconstructor(); 462 const font = reconstructor.reconstructFromEOT(eotData); 463 464 // Step 2: Analyze subset 465 const subsetAnalyzer = new SubsetAnalyzer(); 466 const subset = subsetAnalyzer.analyzeSubset(font); 467 468 // Step 3: Convert glyphs to SVG 469 const svgGlyphs = new Map(); 470 471 for (const [unicode, glyph] of Object.entries(font.glyphs)) { 472 const svgPath = this.glyphToSVG(glyph, font.metrics); 473 474 if (optimizePaths) { 475 svgPath.d = this.optimizePath(svgPath.d); 476 } 477 478 svgGlyphs.set(unicode, svgPath); 479 } 480 481 // Step 4: Generate SVG font or collection 482 const svg = this.generateSVGOutput(svgGlyphs, font, { 483 embedMetadata, 484 subset, 485 preserveHinting 486 }); 487 488 // Step 5: Add fallbacks if requested 489 if (generateFallbacks) { 490 svg.fallbacks = this.generateFallbacks(font); 491 } 492 493 return svg; 494} 495 496glyphToSVG(glyph, metrics) { 497 // Handle EOT-specific glyph data 498 const path = { 499 unicode: glyph.unicode, 500 name: glyph.name || \`glyph\${glyph.unicode}\`, 501 d: '', 502 advance: glyph.advanceWidth || metrics.defaultAdvance, 503 bbox: null 504 }; 505 506 // Convert glyph outlines 507 if (glyph.contours) { 508 path.d = this.contoursToPath(glyph.contours, metrics); 509 path.bbox = this.calculateBBox(glyph.contours); 510 } else if (glyph.simple) { 511 path.d = this.simpleGlyphToPath(glyph.simple); 512 } else if (glyph.composite) { 513 path.d = this.compositeGlyphToPath(glyph.composite); 514 } 515 516 return path; 517} 518 519generateSVGOutput(glyphs, font, options) { 520 const svg = { 521 type: 'font', 522 metadata: {}, 523 glyphs: Array.from(glyphs.values()), 524 metrics: font.metrics 525 }; 526 527 if (options.embedMetadata) { 528 svg.metadata = { 529 source: 'EOT Conversion', 530 originalFormat: 'Embedded OpenType', 531 fontFamily: font.names?.family, 532 copyright: font.names?.copyright, 533 subset: options.subset, 534 conversionDate: new Date().toISOString() 535 }; 536 } 537 538 return svg; 539} 540}`}),"\n",(0,n.jsx)(t.h2,{children:"Migration Strategies"}),"\n",(0,n.jsx)(t.h3,{children:"Bulk EOT Conversion"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Batch EOT migration tool 541class EOTMigrationTool { 542async migrateLegacyFonts(eotFiles, targetFormat = 'woff2') { 543 const results = { 544 successful: [], 545 failed: [], 546 warnings: [] 547 }; 548 549 for (const file of eotFiles) { 550 try { 551 // Read EOT file 552 const eotData = await this.readFile(file); 553
554 // Check security restrictions 555 const security = new EOTSecurity().extractSecurityInfo(eotData); 556 557 if (security.permissions.restricted) { 558 results.warnings.push({ 559 file: file.name, 560 message: 'Font has embedding restrictions' 561 }); 562 } 563 564 // Convert to intermediate format 565 const font = await new FontReconstructor().reconstructFromEOT(eotData); 566 567 // Convert to target format 568 let output; 569 switch (targetFormat) { 570 case 'svg': 571 output = await this.convertToSVG(font); 572 break; 573 case 'woff': 574 output = await this.convertToWOFF(font); 575 break; 576 case 'woff2': 577 output = await this.convertToWOFF2(font); 578 break; 579 case 'ttf': 580 output = await this.convertToTTF(font); 581 break; 582 } 583 584 results.successful.push({ 585 source: file.name, 586 target: \`\${file.name.replace('.eot', '')}.\${targetFormat}\`, 587 size: { 588 before: eotData.byteLength, 589 after: output.byteLength, 590 reduction: Math.round((1 - output.byteLength / eotData.byteLength) * 100) 591 } 592 }); 593 594 } catch (error) { 595 results.failed.push({ 596 file: file.name, 597 error: error.message 598 }); 599 } 600 } 601 602 return results; 603} 604}`}),"\n",(0,n.jsx)(t.h2,{children:"Quality Assurance"}),"\n",(0,n.jsx)(t.h3,{children:"EOT Validation"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Comprehensive EOT validation 605class EOTValidator { 606validate(eotData) { 607 const validation = { 608 structure: this.validateStructure(eotData), 609 compression: this.validateCompression(eotData), 610 font: this.validateFontData(eotData), 611 security: this.validateSecurity(eotData) 612 }; 613 614 return { 615 valid: Object.values(validation).every(v => v.valid), 616 details: validation, 617 recommendations: this.generateRecommendations(validation) 618 }; 619} 620 621validateStructure(data) { 622 const checks = []; 623 624 try { 625 const header = new EOTParser(data).parseEOTHeader(); 626 627 // Check magic number 628 checks.push({ 629 name: 'Magic Number', 630 valid: header.MagicNumber === 0x504C, 631 value: \`0x\${header.MagicNumber.toString(16)}\` 632 }); 633 634 // Check version 635 checks.push({ 636 name: 'Version', 637 valid: [0x00010000, 0x00020001, 0x00020002].includes(header.Version), 638 value: \`0x\${header.Version.toString(16)}\` 639 }); 640 641 // Check data size consistency 642 checks.push({ 643 name: 'Size Consistency', 644 valid: header.EOTSize <= data.byteLength, 645 value: \`\${header.EOTSize} / \${data.byteLength}\` 646 }); 647 648 } catch (error) { 649 return { 650 valid: false, 651 error: error.message, 652 checks: checks 653 }; 654 } 655 656 return { 657 valid: checks.every(c => c.valid), 658 checks: checks 659 }; 660} 661}`}),"\n",(0,n.jsx)(t.h2,{children:"Performance Optimization"}),"\n",(0,n.jsx)(t.h3,{children:"Streaming Decompression"}),"\n",(0,n.jsx)("pre",{className:"bg-slate-900 text-gray-100 p-4 rounded-lg overflow-x-auto my-4 font-mono text-sm",children:`// Streaming MTX decompression for large EOT files 662class StreamingMTXDecompressor { 663async decompressStream(inputStream, expectedSize) { 664 const reader = inputStream.getReader(); 665 const output = new Uint8Array(expectedSize); 666 let outputPos = 0; 667 668 const buffer = []; 669 let bufferPos = 0; 670 671 while (outputPos < expectedSize) { 672 // Read more data if buffer is empty 673 if (bufferPos >= buffer.length) { 674 const { value, done } = await reader.read(); 675 if (done) break; 676 677 buffer.push(...value); 678 bufferPos = 0; 679 } 680 681 // Process control byte 682 const controlByte = buffer[bufferPos++]; 683 684 for (let bit = 0; bit < 8 && outputPos < expectedSize; bit++) { 685 if (bufferPos >= buffer.length) { 686 // Need more data 687 break; 688 } 689 690 if (controlByte & (1 << bit)) { 691 // Literal byte 692 output[outputPos++] = buffer[bufferPos++]; 693 } else { 694 // LZ77 reference 695 if (bufferPos + 1 >= buffer.length) break; 696 697 const byte1 = buffer[bufferPos++]; 698 const byte2 = buffer[bufferPos++]; 699 700 const offset = ((byte2 & 0xF0) << 4) | byte1; 701 const length = (byte2 & 0x0F) + 3; 702 703 for (let i = 0; i < length && outputPos < expectedSize; i++) { 704 output[outputPos] = output[outputPos - offset]; 705 outputPos++; 706 } 707 } 708 } 709 } 710 711 return output; 712} 713}`}),"\n",(0,n.jsx)(t.h2,{children:"Related Tools"}),"\n",(0,n.jsx)(a,{converters:[{name:"TTF to SVG",path:"/convert/ttf-to-svg"},{name:"OTF to SVG",path:"/convert/otf-to-svg"},{name:"WOFF to SVG",path:"/convert/woff-to-svg"},{name:"SVG to TTF",path:"/convert/svg-to-ttf"}]}),"\n",(0,n.jsx)(t.h2,{children:"Frequently Asked Questions"}),"\n",(0,n.jsx)(s,{faqs:[{question:"Why would I need to convert EOT files in 2024?",answer:"EOT conversion is primarily needed for legacy website migration, font recovery from old projects, or historical preservation. Many organizations have EOT files from IE-only intranets that need modernization for current browsers."},{question:"Is MTX compression better than modern alternatives?",answer:"No, MTX compression is inferior to modern methods. WOFF uses zlib compression (40% reduction) while WOFF2 uses Brotli (50-60% reduction). MTX typically achieved only 20-30% compression and is proprietary to Microsoft."},{question:"Can URL-bound EOT files be converted legally?",answer:"URL binding was a weak DRM attempt, not a legal restriction. However, you should still respect the font's actual license terms. The URL binding can be documented but doesn't prevent te
713chnical conversion."},{question:"How do I handle corrupted EOT files?",answer:"Our converter attempts recovery through multiple strategies: trying uncompressed extraction, partial decompression, and reconstructing missing tables from EOT header metadata. Some corruption may be unrecoverable."},{question:"Should I preserve EOT files or convert them all?",answer:"Convert for practical use, but consider preserving originals for historical documentation. EOT files represent an important chapter in web typography history, even if the format is obsolete."}]}),"\n",(0,n.jsx)(t.h2,{children:"Conclusion"}),"\n",(0,n.jsx)(t.p,{children:"EOT to SVG conversion represents more than technical format transformationâit's digital archaeology, recovering typography assets from the early web era. While EOT's proprietary compression, URL binding, and Internet Explorer exclusivity made it a evolutionary dead-end, the fonts contained within these files often have historical or practical value worth preserving."}),"\n",(0,n.jsx)(t.p,{children:"The conversion process navigates multiple challenges: proprietary MTX decompression, subset recovery, security restriction handling, and metadata preservation. Success requires understanding both the historical context of EOT's creation and modern font standards for proper migration."}),"\n",(0,n.jsx)(t.p,{children:"As we move forward with universal font formats like WOFF2 and variable fonts, EOT conversion ensures no typography is left behind in the transition. Whether migrating legacy corporate systems, preserving web history, or recovering lost font assets, this converter bridges the gap between Microsoft's proprietary past and the open standards of modern web typography."})]})}function i(e={}){let{wrapper:t}={...(0,o.R)(),...e.components};return t?(0,n.jsx)(t,{...e,children:(0,n.jsx)(a,{...e})}):a(e)}function c(e,t){throw Error("Expected "+(t?"component":"object")+" `"+e+"` to be defined: you likely forgot to import, pass, or provide it.")}}}]);
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.