base64.* -> guacio.*

guacamole/proxy/guacio.c

@@ -0,0 +1,126 @@
+
+#include <unistd.h>
+#include <stdio.h>
+
+#include "guacio.h"
+
+char characters[64] = {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+    'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', 
+};
+
+int ready_buf[3];
+int ready = 0;
+
+int written = 0;
+char out_buf[8192];
+
+ssize_t __write_base64_triplet(int fd, int a, int b, int c) {
+
+    int retval;
+
+    /* Byte 1 */
+    out_buf[written++] = characters[(a & 0xFC) >> 2]; /* [AAAAAA]AABBBB BBBBCC CCCCCC */
+
+    if (b >= 0) {
+        out_buf[written++] = characters[((a & 0x03) << 4) | ((b & 0xF0) >> 4)]; /* AAAAAA[AABBBB]BBBBCC CCCCCC */
+
+        if (c >= 0) {
+            out_buf[written++] = characters[((b & 0x0F) << 2) | ((c & 0xC0) >> 6)]; /* AAAAAA AABBBB[BBBBCC]CCCCCC */
+            out_buf[written++] = characters[c & 0x3F]; /* AAAAAA AABBBB BBBBCC[CCCCCC] */
+        }
+        else { 
+            out_buf[written++] = characters[((b & 0x0F) << 2)]; /* AAAAAA AABBBB[BBBB--]------ */
+            out_buf[written++] = '='; /* AAAAAA AABBBB BBBB--[------] */
+        }
+    }
+    else {
+        out_buf[written++] = characters[((a & 0x03) << 4)]; /* AAAAAA[AA----]------ ------ */
+        out_buf[written++] = '='; /* AAAAAA AA----[------]------ */
+        out_buf[written++] = '='; /* AAAAAA AA---- ------[------] */
+    }
+
+    /* At this point, 4 bytes have been written */
+
+    /* Flush when necessary, return on error */
+    if (written > 8188 /* sizeof(out_buf) - 4 */) {
+        retval = write(fd, out_buf, written);
+        if (retval < 0)
+            return retval;
+
+        written = 0;
+    }
+
+    if (b < 0)
+        return 1;
+
+    if (c < 0)
+        return 2;
+
+    return 3;
+
+}
+
+ssize_t __write_base64_byte(int fd, char buf) {
+
+    int retval;
+
+    ready_buf[ready++] = buf & 0xFF;
+
+    /* Flush triplet */
+    if (ready == 3) {
+        retval = __write_base64_triplet(fd, ready_buf[0], ready_buf[1], ready_buf[2]);
+        if (retval < 0)
+            return retval;
+
+        ready = 0;
+    }
+
+    return 1;
+}
+
+ssize_t write_base64(int fd, const void* buf, size_t count) {
+
+    int retval;
+
+    const char* char_buf = (const char*) buf;
+    const char* end = char_buf + count;
+
+    while (char_buf < end) {
+
+        retval = __write_base64_byte(fd, *(char_buf++));
+        if (retval < 0)
+            return retval;
+
+    }
+
+    return count;
+
+}
+
+ssize_t flush_base64(int fd) {
+
+    int retval;
+
+    /* Flush triplet to output buffer */
+    while (ready > 0) {
+        retval = __write_base64_byte(fd, -1);
+        if (retval < 0)
+            return retval;
+    }
+
+    /* Flush remaining bytes in buffer */
+    if (written > 0) {
+        retval = write(fd, out_buf, written);
+        if (retval < 0)
+            return retval;
+
+        written = 0;
+    }
+
+    return 0;
+
+}
+