Task 189: .ESCSCH File Format
Task 189: .ESCSCH File Format
.ESCSCH File Format Specifications
After extensive searching across web sources, including Wikipedia, company websites, and related tools, the .ESCSCH file format (typically lowercase .escsch) is a proprietary data format used by esCAD sch, a free circuit diagram creation CAD software developed by Electro-System Co., Ltd. (Japan). It stores schematic data for electronic circuit designs, such as components, wiring, references, and properties. The software is designed for Windows and integrates with esCAD pcb for PCB pattern design.
However, no public specifications for the internal structure of .ESCSCH files were found. It is described as a "data file" in sources like Wikipedia's list of file formats, but no detailed documentation on headers, fields, encoding, or byte layout is available online. The format is likely proprietary and binary, based on the software's description (e.g., it supports text-based package files for libraries but the main schematic file is not detailed). Without specs, decoding or writing code to parse it would require reverse engineering, which is not recommended or supported here.
List of Properties Intrinsic to the File Format:
- File Extension: .escsch (case-insensitive, often lowercase).
- Mime Type: Unknown (not standardized; treated as application/octet-stream or similar).
- Associated Software: esCAD sch (freeware from Electro-System Co., Ltd.).
- Content Type: Schematic data for electronic circuits, including components (with pins, references, values), wiring, groups, and properties.
- Format Type: Proprietary, likely binary (inferred from similar CAD formats; libraries use text but main files do not).
- Integration: Supports back annotation from PCB tools like esCAD pcb, using separate correction files.
- Backup Mechanism: Software includes data backup features, but this is application-level, not intrinsic to the file.
- Size/Compression: No known compression; file size depends on schematic complexity (no limits specified).
- Versioning: Tied to software versions (e.g., latest Ver 1.690 as of 2023); files may include version metadata internally, but unconfirmed.
- Platform: Windows-specific (requires .NET Framework 4.0).
These properties are derived from software descriptions; no deeper file system intrinsics (e.g., magic numbers, endianness) are publicly documented.
Two Direct Download Links for .ESCSCH Files:
No public sample or example .ESCSCH files were found in searches. The software is available for download (via email from http://sch.escad.jp/), and users can create their own files, but no pre-made samples or direct downloads exist online. If you install esCAD sch, you can generate empty or tutorial files.
Since no public file format specifications are available, I cannot provide functional code to decode, read, or write .ESCSCH files without guessing or reverse engineering, which would be inaccurate and misleading. The following code snippets are placeholders demonstrating how such classes might be structured if specs were known (e.g., assuming a hypothetical header with magic bytes "ESCS" and fields for component count). They will not work on real .ESCSCH files.
Ghost Blog Embedded HTML/JavaScript for Drag-and-Drop .ESCSCH Dumper:
Python Class for .ESCSCH Handling:
import struct
import sys
class ESCSCHHandler:
def __init__(self, filepath):
self.filepath = filepath
self.data = None
def read(self):
with open(self.filepath, 'rb') as f:
self.data = f.read()
# Hypothetical decoding (no real specs)
magic, version, component_count = struct.unpack('<4sII', self.data[:12])
print(f"File Extension: .escsch")
print(f"Magic: {magic.decode('ascii')}")
print(f"Version: {version}")
print(f"Component Count: {component_count}")
# Other properties would be added if specs were known
def write(self, properties):
# Hypothetical writing (placeholder)
with open(self.filepath, 'wb') as f:
f.write(struct.pack('<4sII', b'ESCS', 1, 0)) # Dummy data
print("File written (hypothetical; no real specs available).")
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Usage: python escsch.py <file.escsch>")
else:
handler = ESCSCHHandler(sys.argv[1])
handler.read()
Java Class for .ESCSCH Handling:
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class ESCSCHHandler {
private String filepath;
private byte[] data;
public ESCSCHHandler(String filepath) {
this.filepath = filepath;
}
public void read() throws IOException {
try (FileInputStream fis = new FileInputStream(filepath)) {
data = fis.readAllBytes();
}
// Hypothetical decoding
ByteBuffer bb = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
String magic = new String(data, 0, 4, "ASCII");
int version = bb.getInt(4);
int componentCount = bb.getInt(8);
System.out.println("File Extension: .escsch");
System.out.println("Magic: " + magic);
System.out.println("Version: " + version);
System.out.println("Component Count: " + componentCount);
}
public void write() throws IOException {
// Hypothetical writing
try (FileOutputStream fos = new FileOutputStream(filepath)) {
ByteBuffer bb = ByteBuffer.allocate(12).order(ByteOrder.LITTLE_ENDIAN);
bb.put("ESCS".getBytes("ASCII"));
bb.putInt(1); // version
bb.putInt(0); // component count
fos.write(bb.array());
}
System.out.println("File written (hypothetical; no real specs available).");
}
public static void main(String[] args) {
if (args.length < 1) {
System.out.println("Usage: java ESCSCHHandler <file.escsch>");
return;
}
try {
ESCSCHHandler handler = new ESCSCHHandler(args[0]);
handler.read();
} catch (IOException e) {
e.printStackTrace();
}
}
}
JavaScript Class for .ESCSCH Handling:
class ESCSCHHandler {
constructor(filepath) {
this.filepath = filepath;
}
async read() {
// Node.js example; requires fs module
const fs = require('fs');
const buffer = fs.readFileSync(this.filepath);
const view = new DataView(buffer.buffer);
const magic = String.fromCharCode(view.getUint8(0), view.getUint8(1), view.getUint8(2), view.getUint8(3));
const version = view.getUint32(4, true);
const componentCount = view.getUint32(8, true);
console.log('File Extension: .escsch');
console.log(`Magic: ${magic}`);
console.log(`Version: ${version}`);
console.log(`Component Count: ${componentCount}`);
}
write() {
// Hypothetical writing (Node.js)
const fs = require('fs');
const buffer = Buffer.alloc(12);
buffer.write('ESCS', 0, 4, 'ascii');
buffer.writeUInt32LE(1, 4); // version
buffer.writeUInt32LE(0, 8); // component count
fs.writeFileSync(this.filepath, buffer);
console.log('File written (hypothetical; no real specs available).');
}
}
// Usage: node escsch.js <file.escsch>
if (process.argv.length < 3) {
console.log('Usage: node escsch.js <file.escsch>');
} else {
const handler = new ESCSCHHandler(process.argv[2]);
handler.read();
}
C Class (Struct) for .ESCSCH Handling:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef struct {
char* filepath;
uint8_t* data;
size_t size;
} ESCSCHHandler;
ESCSCHHandler* create_handler(const char* filepath) {
ESCSCHHandler* h = malloc(sizeof(ESCSCHHandler));
h->filepath = (char*)filepath;
return h;
}
void read(ESCSCHHandler* h) {
FILE* f = fopen(h->filepath, "rb");
if (!f) {
perror("Error opening file");
return;
}
fseek(f, 0, SEEK_END);
h->size = ftell(f);
fseek(f, 0, SEEK_SET);
h->data = malloc(h->size);
fread(h->data, 1, h->size, f);
fclose(f);
// Hypothetical decoding (little-endian assumed)
char magic[5] = {0};
snprintf(magic, 5, "%c%c%c%c", h->data[0], h->data[1], h->data[2], h->data[3]);
uint32_t version = *(uint32_t*)(h->data + 4);
uint32_t component_count = *(uint32_t*)(h->data + 8);
printf("File Extension: .escsch\n");
printf("Magic: %s\n", magic);
printf("Version: %u\n", version);
printf("Component Count: %u\n", component_count);
}
void write(ESCSCHHandler* h) {
FILE* f = fopen(h->filepath, "wb");
if (!f) {
perror("Error opening file");
return;
}
uint8_t buffer[12] = {'E', 'S', 'C', 'S', 1, 0, 0, 0, 0, 0, 0, 0}; // Dummy data (LE)
fwrite(buffer, 1, 12, f);
fclose(f);
printf("File written (hypothetical; no real specs available).\n");
}
void destroy_handler(ESCSCHHandler* h) {
free(h->data);
free(h);
}
int main(int argc, char** argv) {
if (argc < 2) {
printf("Usage: %s <file.escsch>\n", argv[0]);
return 1;
}
ESCSCHHandler* handler = create_handler(argv[1]);
read(handler);
destroy_handler(handler);
return 0;
}