liveMedia/Base64.cpp File Reference

#include "Base64.hh"
#include <strDup.hh>
#include <string.h>

Include dependency graph for Base64.cpp:

Go to the source code of this file.

Functions
static void	initBase64DecodeTable ()
unsigned char *	base64Decode (char *in, unsigned &resultSize, Boolean trimTrailingZeros)
char *	base64Encode (char const *origSigned, unsigned origLength)
Variables
static char	base64DecodeTable [256]
static const char	base64Char []

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Function Documentation

unsigned char* base64Decode	(	char *	in,
		unsigned &	resultSize,
		Boolean	trimTrailingZeros
	)

Definition at line 40 of file Base64.cpp.

References base64DecodeTable, False, initBase64DecodeTable(), strDupSize(), and True.

Referenced by QuickTimeFileSink::addAtom_hdlr2(), and parseSPropParameterSets().

                                                       {
  static Boolean haveInitedBase64DecodeTable = False;
  if (!haveInitedBase64DecodeTable) {
    initBase64DecodeTable();
    haveInitedBase64DecodeTable = True;
  }

  unsigned char* out = (unsigned char*)strDupSize(in); // ensures we have enough space
  int k = 0;
  int const jMax = strlen(in) - 3;
     // in case "in" is not a multiple of 4 bytes (although it should be)
  for (int j = 0; j < jMax; j += 4) {
    char inTmp[4], outTmp[4];
    for (int i = 0; i < 4; ++i) {
      inTmp[i] = in[i+j];
      outTmp[i] = base64DecodeTable[(unsigned char)inTmp[i]];
      if ((outTmp[i]&0x80) != 0) outTmp[i] = 0; // pretend the input was 'A'
    }

    out[k++] = (outTmp[0]<<2) | (outTmp[1]>>4);
    out[k++] = (outTmp[1]<<4) | (outTmp[2]>>2);
    out[k++] = (outTmp[2]<<6) | outTmp[3];
  }

  if (trimTrailingZeros) {
    while (k > 0 && out[k-1] == '\0') --k;
  }
  resultSize = k;
  unsigned char* result = new unsigned char[resultSize];
  memmove(result, out, resultSize);
  delete[] out;

  return result;
}

char* base64Encode	(	char const *	origSigned,
		unsigned	origLength
	)

Definition at line 79 of file Base64.cpp.

References base64Char, and NULL.

Referenced by RTSPClient::createAuthenticatorString(), and RTSPClient::sendRequest().

                                                                {
  unsigned char const* orig = (unsigned char const*)origSigned; // in case any input bytes have the MSB set
  if (orig == NULL) return NULL;

  unsigned const numOrig24BitValues = origLength/3;
  Boolean havePadding = origLength > numOrig24BitValues*3;
  Boolean havePadding2 = origLength == numOrig24BitValues*3 + 2;
  unsigned const numResultBytes = 4*(numOrig24BitValues + havePadding);
  char* result = new char[numResultBytes+1]; // allow for trailing '\0'

  // Map each full group of 3 input bytes into 4 output base-64 characters:
  unsigned i;
  for (i = 0; i < numOrig24BitValues; ++i) {
    result[4*i+0] = base64Char[(orig[3*i]>>2)&0x3F];
    result[4*i+1] = base64Char[(((orig[3*i]&0x3)<<4) | (orig[3*i+1]>>4))&0x3F];
    result[4*i+2] = base64Char[((orig[3*i+1]<<2) | (orig[3*i+2]>>6))&0x3F];
    result[4*i+3] = base64Char[orig[3*i+2]&0x3F];
  }

  // Now, take padding into account.  (Note: i == numOrig24BitValues)
  if (havePadding) {
    result[4*i+0] = base64Char[(orig[3*i]>>2)&0x3F];
    if (havePadding2) {
      result[4*i+1] = base64Char[(((orig[3*i]&0x3)<<4) | (orig[3*i+1]>>4))&0x3F];
      result[4*i+2] = base64Char[(orig[3*i+1]<<2)&0x3F];
    } else {
      result[4*i+1] = base64Char[((orig[3*i]&0x3)<<4)&0x3F];
      result[4*i+2] = '=';
    }
    result[4*i+3] = '=';
  }

  result[numResultBytes] = '\0';
  return result;
}

static void initBase64DecodeTable

(

)

[static]

Definition at line 27 of file Base64.cpp.

References base64DecodeTable.

Referenced by base64Decode().

                                    {
  int i;
  for (i = 0; i < 256; ++i) base64DecodeTable[i] = (char)0x80;
      // default value: invalid

  for (i = 'A'; i <= 'Z'; ++i) base64DecodeTable[i] = 0 + (i - 'A');
  for (i = 'a'; i <= 'z'; ++i) base64DecodeTable[i] = 26 + (i - 'a');
  for (i = '0'; i <= '9'; ++i) base64DecodeTable[i] = 52 + (i - '0');
  base64DecodeTable[(unsigned char)'+'] = 62;
  base64DecodeTable[(unsigned char)'/'] = 63;
  base64DecodeTable[(unsigned char)'='] = 0;
}

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Variable Documentation

const char base64Char[] [static]

Initial value:

"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

Definition at line 76 of file Base64.cpp.

Referenced by base64Encode().

char base64DecodeTable[256] [static]

Definition at line 25 of file Base64.cpp.

Referenced by base64Decode(), and initBase64DecodeTable().

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