--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/base64.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,326 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2019, 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 https://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 */
+
+#include "curl_setup.h"
+
+#if !defined(CURL_DISABLE_HTTP_AUTH) || defined(USE_SSH) || \
+  !defined(CURL_DISABLE_LDAP) || \
+  !defined(CURL_DISABLE_DOH) || defined(USE_SSL)
+
+#include "urldata.h" /* for the Curl_easy definition */
+#include "warnless.h"
+#include "curl_base64.h"
+#include "non-ascii.h"
+
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/* ---- Base64 Encoding/Decoding Table --- */
+static const char base64[]=
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+/* The Base 64 encoding with an URL and filename safe alphabet, RFC 4648
+   section 5 */
+static const char base64url[]=
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+static size_t decodeQuantum(unsigned char *dest, const char *src)
+{
+  size_t padding = 0;
+  const char *s, *p;
+  unsigned long i, x = 0;
+
+  for(i = 0, s = src; i < 4; i++, s++) {
+    if(*s == '=') {
+      x = (x << 6);
+      padding++;
+    }
+    else {
+      unsigned long v = 0;
+      p = base64;
+
+      while(*p && (*p != *s)) {
+        v++;
+        p++;
+      }
+
+      if(*p == *s)
+        x = (x << 6) + v;
+      else
+        return 0;
+    }
+  }
+
+  if(padding < 1)
+    dest[2] = curlx_ultouc(x & 0xFFUL);
+
+  x >>= 8;
+  if(padding < 2)
+    dest[1] = curlx_ultouc(x & 0xFFUL);
+
+  x >>= 8;
+  dest[0] = curlx_ultouc(x & 0xFFUL);
+
+  return 3 - padding;
+}
+
+/*
+ * Curl_base64_decode()
+ *
+ * Given a base64 NUL-terminated string at src, decode it and return a
+ * pointer in *outptr to a newly allocated memory area holding decoded
+ * data. Size of decoded data is returned in variable pointed by outlen.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When decoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64_decode(const char *src,
+                            unsigned char **outptr, size_t *outlen)
+{
+  size_t srclen = 0;
+  size_t length = 0;
+  size_t padding = 0;
+  size_t i;
+  size_t numQuantums;
+  size_t rawlen = 0;
+  unsigned char *pos;
+  unsigned char *newstr;
+
+  *outptr = NULL;
+  *outlen = 0;
+  srclen = strlen(src);
+
+  /* Check the length of the input string is valid */
+  if(!srclen || srclen % 4)
+    return CURLE_BAD_CONTENT_ENCODING;
+
+  /* Find the position of any = padding characters */
+  while((src[length] != '=') && src[length])
+    length++;
+
+  /* A maximum of two = padding characters is allowed */
+  if(src[length] == '=') {
+    padding++;
+    if(src[length + 1] == '=')
+      padding++;
+  }
+
+  /* Check the = padding characters weren't part way through the input */
+  if(length + padding != srclen)
+    return CURLE_BAD_CONTENT_ENCODING;
+
+  /* Calculate the number of quantums */
+  numQuantums = srclen / 4;
+
+  /* Calculate the size of the decoded string */
+  rawlen = (numQuantums * 3) - padding;
+
+  /* Allocate our buffer including room for a zero terminator */
+  newstr = malloc(rawlen + 1);
+  if(!newstr)
+    return CURLE_OUT_OF_MEMORY;
+
+  pos = newstr;
+
+  /* Decode the quantums */
+  for(i = 0; i < numQuantums; i++) {
+    size_t result = decodeQuantum(pos, src);
+    if(!result) {
+      free(newstr);
+
+      return CURLE_BAD_CONTENT_ENCODING;
+    }
+
+    pos += result;
+    src += 4;
+  }
+
+  /* Zero terminate */
+  *pos = '\0';
+
+  /* Return the decoded data */
+  *outptr = newstr;
+  *outlen = rawlen;
+
+  return CURLE_OK;
+}
+
+static CURLcode base64_encode(const char *table64,
+                              struct Curl_easy *data,
+                              const char *inputbuff, size_t insize,
+                              char **outptr, size_t *outlen)
+{
+  CURLcode result;
+  unsigned char ibuf[3];
+  unsigned char obuf[4];
+  int i;
+  int inputparts;
+  char *output;
+  char *base64data;
+  char *convbuf = NULL;
+
+  const char *indata = inputbuff;
+
+  *outptr = NULL;
+  *outlen = 0;
+
+  if(!insize)
+    insize = strlen(indata);
+
+#if SIZEOF_SIZE_T == 4
+  if(insize > UINT_MAX/4)
+    return CURLE_OUT_OF_MEMORY;
+#endif
+
+  base64data = output = malloc(insize * 4 / 3 + 4);
+  if(!output)
+    return CURLE_OUT_OF_MEMORY;
+
+  /*
+   * 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.
+   */
+  result = Curl_convert_clone(data, indata, insize, &convbuf);
+  if(result) {
+    free(output);
+    return result;
+  }
+
+  if(convbuf)
+    indata = (char *)convbuf;
+
+  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 */
+      msnprintf(output, 5, "%c%c==",
+                table64[obuf[0]],
+                table64[obuf[1]]);
+      break;
+
+    case 2: /* two bytes read */
+      msnprintf(output, 5, "%c%c%c=",
+                table64[obuf[0]],
+                table64[obuf[1]],
+                table64[obuf[2]]);
+      break;
+
+    default:
+      msnprintf(output, 5, "%c%c%c%c",
+                table64[obuf[0]],
+                table64[obuf[1]],
+                table64[obuf[2]],
+                table64[obuf[3]]);
+      break;
+    }
+    output += 4;
+  }
+
+  /* Zero terminate */
+  *output = '\0';
+
+  /* Return the pointer to the new data (allocated memory) */
+  *outptr = base64data;
+
+  free(convbuf);
+
+  /* Return the length of the new data */
+  *outlen = strlen(base64data);
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_base64_encode()
+ *
+ * Given a pointer to an input buffer and an input size, encode it and
+ * return a pointer in *outptr to a newly allocated memory area holding
+ * encoded data. Size of encoded data is returned in variable pointed by
+ * outlen.
+ *
+ * Input length of 0 indicates input buffer holds a NUL-terminated string.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When encoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64_encode(struct Curl_easy *data,
+                            const char *inputbuff, size_t insize,
+                            char **outptr, size_t *outlen)
+{
+  return base64_encode(base64, data, inputbuff, insize, outptr, outlen);
+}
+
+/*
+ * Curl_base64url_encode()
+ *
+ * Given a pointer to an input buffer and an input size, encode it and
+ * return a pointer in *outptr to a newly allocated memory area holding
+ * encoded data. Size of encoded data is returned in variable pointed by
+ * outlen.
+ *
+ * Input length of 0 indicates input buffer holds a NUL-terminated string.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When encoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64url_encode(struct Curl_easy *data,
+                               const char *inputbuff, size_t insize,
+                               char **outptr, size_t *outlen)
+{
+  return base64_encode(base64url, data, inputbuff, insize, outptr, outlen);
+}
+
+#endif /* no users so disabled */