Initial commit.

c_bridge.c

@@ -0,0 +1,118 @@
+#include "c_bridge.h"
+#include <string.h>
+#include <unicode/utypes.h>
+#include <unicode/ucsdet.h>
+#include <stdlib.h>
+#include <unicode/ucnv.h>
+
+// See description in c_bridge.h
+const int detectCharset(void        *detector, 
+                        void        *input, 
+                        int         input_len, 
+                        int         *status, 
+                        MatchData   *matchBuffer, 
+                        int         matchBufferSize) {
+
+    // Put input bytes in the detector.
+    ucsdet_setText((UCharsetDetector*)detector, (char*)input, input_len, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    // Prepare vars for returned count and guesses.
+    int matchCount;
+    const UCharsetMatch **bestGuesses;
+
+    // Perform analysis and return all guesses and their count.
+    bestGuesses = ucsdet_detectAll((UCharsetDetector*)detector, &matchCount, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    // Fill the matchBuffer. Its size is matchBufferSize, so it is filled with
+    // less or equal to matchBufferSize number of entries.
+    int i;
+    int retCount = matchCount > matchBufferSize ? matchBufferSize : matchCount;
+
+    for (i = 0; i < retCount; i++) {
+
+        const UCharsetMatch* bestGuess = bestGuesses[i];
+        const char *bestGuessedCharset = NULL;
+        const char *bestGuessedLanguage = NULL;
+
+        // Fill guessed encoding
+        bestGuessedCharset = ucsdet_getName(bestGuess, status);
+        if (*status != U_ZERO_ERROR) {
+            return 0;
+        }
+
+        // Fill guessed language
+        bestGuessedLanguage = ucsdet_getLanguage(bestGuess, status);
+        if (*status != U_ZERO_ERROR) {
+            return 0;
+        }
+
+        // Fill its confidence rating
+        int32_t conf = ucsdet_getConfidence(bestGuess, status);
+        if (*status != U_ZERO_ERROR) {
+            return 0;
+        }
+
+        matchBuffer[i].confidence = conf;
+        matchBuffer[i].charset = bestGuessedCharset;
+        matchBuffer[i].language = bestGuessedLanguage;
+    }
+
+    // Return the number of guesses put into matchBuffer.
+    return retCount;
+}
+
+// See description in c_bridge.h
+int convertToUtf16(const char   *srcEncoding,
+                   UChar        *dest, 
+                   int32_t      destCapacity,
+                   const char   *src,
+                   int32_t      srcLength,
+                   int          *status){
+    UConverter *conv;
+
+    conv = ucnv_open(srcEncoding, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    /* Convert from original encoding to UTF-16 */
+    int len = ucnv_toUChars(conv, dest, destCapacity, src, srcLength, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    ucnv_close(conv);
+
+    return len;
+}
+
+// See description in c_bridge.h
+int convertFromUtf16(const char   *destEncoding,
+                     char         *dest, 
+                     int32_t      destCapacity,
+                     const UChar  *src,
+                     int32_t      srcLength,
+                     int          *status){
+    UConverter *conv;
+
+    conv = ucnv_open(destEncoding, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    /* Convert from UTF-16 to destination encoding */
+    int len = ucnv_fromUChars(conv, dest, destCapacity, src, srcLength, status);
+    if (*status != U_ZERO_ERROR) {
+        return 0;
+    }
+
+    ucnv_close(conv);
+
+    return len;
+}