third-party libs

third-party/curl-7.21.4/lib/base64.c

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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/* Base64 encoding/decoding
+ *
+ * Test harnesses down the bottom - compile with -DTEST_ENCODE for
+ * a program that will read in raw data from stdin and write out
+ * a base64-encoded version to stdout, and the length returned by the
+ * encoding function to stderr. Compile with -DTEST_DECODE for a program that
+ * will go the other way.
+ *
+ * This code will break if int is smaller than 32 bits
+ */
+
+#include "setup.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "urldata.h" /* for the SessionHandle definition */
+#include "easyif.h"  /* for Curl_convert_... prototypes */
+#include "warnless.h"
+#include "curl_base64.h"
+#include "curl_memory.h"
+
+/* include memdebug.h last */
+#include "memdebug.h"
+
+/* ---- Base64 Encoding/Decoding Table --- */
+static const char table64[]=
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static void decodeQuantum(unsigned char *dest, const char *src)
+{
+  const char *s, *p;
+  unsigned long i, v, x = 0;
+
+  for(i = 0, s = src; i < 4; i++, s++) {
+    v = 0;
+    p = table64;
+    while(*p && (*p != *s)) {
+      v++;
+      p++;
+    }
+    if(*p == *s)
+      x = (x << 6) + v;
+    else if(*s == '=')
+      x = (x << 6);
+  }
+
+  dest[2] = curlx_ultouc(x);
+  x >>= 8;
+  dest[1] = curlx_ultouc(x);
+  x >>= 8;
+  dest[0] = curlx_ultouc(x);
+}
+
+/*
+ * Curl_base64_decode()
+ *
+ * Given a base64 string at src, decode it and return an allocated memory in
+ * the *outptr. Returns the length of the decoded data.
+ */
+size_t Curl_base64_decode(const char *src, unsigned char **outptr)
+{
+  size_t length = 0;
+  size_t equalsTerm = 0;
+  size_t i;
+  size_t numQuantums;
+  unsigned char lastQuantum[3];
+  size_t rawlen = 0;
+  unsigned char *newstr;
+
+  *outptr = NULL;
+
+  while((src[length] != '=') && src[length])
+    length++;
+  /* A maximum of two = padding characters is allowed */
+  if(src[length] == '=') {
+    equalsTerm++;
+    if(src[length+equalsTerm] == '=')
+      equalsTerm++;
+  }
+  numQuantums = (length + equalsTerm) / 4;
+
+  /* Don't allocate a buffer if the decoded length is 0 */
+  if(numQuantums == 0)
+    return 0;
+
+  rawlen = (numQuantums * 3) - equalsTerm;
+
+  /* The buffer must be large enough to make room for the last quantum
+  (which may be partially thrown out) and the zero terminator. */
+  newstr = malloc(rawlen+4);
+  if(!newstr)
+    return 0;
+
+  *outptr = newstr;
+
+  /* Decode all but the last quantum (which may not decode to a
+  multiple of 3 bytes) */
+  for(i = 0; i < numQuantums - 1; i++) {
+    decodeQuantum(newstr, src);
+    newstr += 3; src += 4;
+  }
+
+  /* This final decode may actually read slightly past the end of the buffer
+  if the input string is missing pad bytes.  This will almost always be
+  harmless. */
+  decodeQuantum(lastQuantum, src);
+  for(i = 0; i < 3 - equalsTerm; i++)
+    newstr[i] = lastQuantum[i];
+
+  newstr[i] = '\0'; /* zero terminate */
+  return rawlen;
+}
+
+/*
+ * Curl_base64_encode()
+ *
+ * Returns the length of the newly created base64 string. The third argument
+ * is a pointer to an allocated area holding the base64 data. If something
+ * went wrong, 0 is returned.
+ *
+ */
+size_t Curl_base64_encode(struct SessionHandle *data,
+                          const char *inputbuff, size_t insize,
+                          char **outptr)
+{
+  unsigned char ibuf[3];
+  unsigned char obuf[4];
+  int i;
+  int inputparts;
+  char *output;
+  char *base64data;
+#ifdef CURL_DOES_CONVERSIONS
+  char *convbuf = NULL;
+#endif
+
+  const char *indata = inputbuff;
+
+  *outptr = NULL; /* set to NULL in case of failure before we reach the end */
+
+  if(0 == insize)
+    insize = strlen(indata);
+
+  base64data = output = malloc(insize*4/3+4);
+  if(NULL == output)
+    return 0;
+
+#ifdef CURL_DOES_CONVERSIONS
+  /*
+   * The base64 data needs to be created using the network encoding
+   * not the host encoding.  And we can't change the actual input
+   * so we copy it to a buffer, translate it, and use that instead.
+   */
+  if(data) {
+    convbuf = malloc(insize);
+    if(!convbuf) {
+      free(output);
+      return 0;
+    }
+    memcpy(convbuf, indata, insize);
+    if(CURLE_OK != Curl_convert_to_network(data, convbuf, insize)) {
+      free(convbuf);
+      free(output);
+      return 0;
+    }
+    indata = convbuf; /* switch to the converted buffer */
+  }
+#else
+  (void)data;
+#endif
+
+  while(insize > 0) {
+    for (i = inputparts = 0; i < 3; i++) {
+      if(insize > 0) {
+        inputparts++;
+        ibuf[i] = (unsigned char) *indata;
+        indata++;
+        insize--;
+      }
+      else
+        ibuf[i] = 0;
+    }
+
+    obuf[0] = (unsigned char)  ((ibuf[0] & 0xFC) >> 2);
+    obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
+                               ((ibuf[1] & 0xF0) >> 4));
+    obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
+                               ((ibuf[2] & 0xC0) >> 6));
+    obuf[3] = (unsigned char)   (ibuf[2] & 0x3F);
+
+    switch(inputparts) {
+    case 1: /* only one byte read */
+      snprintf(output, 5, "%c%c==",
+               table64[obuf[0]],
+               table64[obuf[1]]);
+      break;
+    case 2: /* two bytes read */
+      snprintf(output, 5, "%c%c%c=",
+               table64[obuf[0]],
+               table64[obuf[1]],
+               table64[obuf[2]]);
+      break;
+    default:
+      snprintf(output, 5, "%c%c%c%c",
+               table64[obuf[0]],
+               table64[obuf[1]],
+               table64[obuf[2]],
+               table64[obuf[3]] );
+      break;
+    }
+    output += 4;
+  }
+  *output=0;
+  *outptr = base64data; /* make it return the actual data memory */
+
+#ifdef CURL_DOES_CONVERSIONS
+  if(data)
+    free(convbuf);
+#endif
+  return strlen(base64data); /* return the length of the new data */
+}
+/* ---- End of Base64 Encoding ---- */