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loadContentXXX methods with sliceBytes supports

This commit is contained in:
lionsoul2014 2025-12-24 13:01:07 +08:00
parent b0de60f6cb
commit 7f9e6b8586
1 changed files with 31 additions and 5 deletions
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36
binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
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@ -25,7 +25,9 @@ public class Searcher {
public static final int VectorIndexCols = 256;
public static final int VectorIndexSize = 8;
// Linux max write / read bytes
// Linux max write / read bytes.
// Check https://mp.weixin.qq.com/s/4xHRcnQbIcjtMGdXEGrxsA
// to get to know why we default to this value.
public static final int MAX_WRITE_BYTES = 0x7ffff000;
// ip version
@ -254,13 +256,19 @@ public class Searcher {
// --- read xdb content
// -- load xdb buffer with random access file handle
public static LongByteArray loadContent(RandomAccessFile handle) throws IOException {
return loadContent(handle, MAX_WRITE_BYTES);
}
public static LongByteArray loadContent(RandomAccessFile handle, final int sliceBytes) throws IOException {
handle.seek(0);
// check the length and do the buff load
long toRead = handle.length();
final LongByteArray byteArray = new LongByteArray();
while (toRead > 0) {
final byte[] buff = new byte[(int) Math.min(toRead, MAX_WRITE_BYTES)];
final byte[] buff = new byte[(int) Math.min(toRead, sliceBytes)];
final int rLen = handle.read(buff);
if (rLen != buff.length) {
throw new IOException("incomplete read: read bytes should be " + buff.length + ", got `" + rLen + "`");
@ -273,25 +281,43 @@ public class Searcher {
return byteArray;
}
// -- load xdb buffer with xdb file object
public static LongByteArray loadContentFromFile(File xdbFile) throws IOException {
return loadContentFromFile(xdbFile, MAX_WRITE_BYTES);
}
public static LongByteArray loadContentFromFile(File xdbFile, final int sliceBytes) throws IOException {
final RandomAccessFile handle = new RandomAccessFile(xdbFile, "r");
final LongByteArray content = loadContent(handle);
final LongByteArray content = loadContent(handle, sliceBytes);
handle.close();
return content;
}
// -- load xdb buffer with xdb file path
public static LongByteArray loadContentFromFile(String xdbPath) throws IOException {
return loadContentFromFile(new File(xdbPath));
return loadContentFromFile(xdbPath, MAX_WRITE_BYTES);
}
public static LongByteArray loadContentFromFile(String xdbPath, final int sliceBytes) throws IOException {
return loadContentFromFile(new File(xdbPath), sliceBytes);
}
// load xdb buffer from input stream
public static LongByteArray loadContentFromInputStream(InputStream is) throws IOException {
return loadContentFromInputStream(is, MAX_WRITE_BYTES);
}
public static LongByteArray loadContentFromInputStream(InputStream is, final int sliceBytes) throws IOException {
final LongByteArray byteArray = new LongByteArray();
while (true) {
boolean done = false;
// read at most MAX_WRITE_BYTES bytes
int rLen, tBytes = 0;
final byte[] buff = new byte[MAX_WRITE_BYTES];
final byte[] buff = new byte[sliceBytes];
while (true) {
rLen = is.read(buff, tBytes, buff.length - tBytes);
if (rLen == -1) {