sacommon.c

IBE是一种非对称密码技术

/* Copyright 2005-2006, Voltage Security, all rights reserved.
 */

#include "vibe.h"
#include "environment.h"
#include "base.h"
#include "libctx.h"
#include "sacommon.h"
#include "vtassert.h"
#include "errorctx.h"
#include "stringutil.h"

const char* VoltSecureArchiveEntryListAttributeName       = "Attachments";
const char* VoltSecureArchiveEntryAttributeName           = "Attachment";
const char* VoltSecureArchiveModDateAttributeName         = "ModDate";
const char* VoltSecureArchiveNameAttributeName            = "Name";
const char* VoltSecureArchiveCompressionAttributeName     = "Compression";
const char* VoltSecureArchiveSizeAttributeName            = "Size";
const char* VoltSecureArchiveCompressedSizeAttributeName  = "CompressedSize";
const char* VoltSecureArchiveDateAttributeFormat          = "%d %d %d %d %d %d";
const char* VoltSecureArchiveIndexFilePathName            = "Index";
const char* VoltSecureArchiveFilePrefixPathName           = "File_";
const char* VoltSecureArchiveHeadersName                  = "ZDMv2Headers";
const char* VoltSecureArchiveYearAttributeName            = "Year";
const char* VoltSecureArchiveMonthAttributeName           = "Month";
const char* VoltSecureArchiveDayAttributeName             = "Day";
const char* VoltSecureArchiveHourAttributeName            = "Hour";
const char* VoltSecureArchiveMinuteAttributeName          = "Minute";
const char* VoltSecureArchiveSecondAttributeName          = "Second";

int VoltCreateTempBufferStream(
  VtLibCtx libCtx,
  VtBufferTypeInfo* bufferTypeInfo,
  VtStreamObject* tempStream
)
{
  int status = 0;
  VtStreamImplMemoryInfo memInfo;
  VtStreamImplFileInfo fileInfo;
  VOLT_DECLARE_FNCT_LINE(fnctLine)

  VT_ASSERT(libCtx != (VtLibCtx)0);
  VT_ASSERT(bufferTypeInfo != (VtBufferTypeInfo*)0);
  VT_ASSERT(tempStream != (VtStreamObject*)0);
  
  do
  {
    *tempStream = (VtStreamObject)0;
    
    if (bufferTypeInfo->bufferType == VT_BUFFER_TYPE_MEMORY)
    {
      Z2Memset(&memInfo, 0, sizeof(memInfo));
      memInfo.openMode = VT_STREAM_OPEN_READ_WRITE;
      memInfo.flags = VT_STREAM_OPEN_ON_ACCESS;
      
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VtCreateStreamObject(libCtx, VtStreamImplMemory,
        (Pointer)&memInfo, tempStream);
    }
    else
    {
      VT_ASSERT(bufferTypeInfo->bufferType == VT_BUFFER_TYPE_FILE);

      Z2Memset(&fileInfo, 0, sizeof(fileInfo));
      fileInfo.fileCtx = bufferTypeInfo->fileCtx;
      fileInfo.openMode = VT_STREAM_OPEN_TEMPORARY;
      fileInfo.flags = VT_STREAM_OPEN_ON_ACCESS;
      fileInfo.fileName = "vt_";
      
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VtCreateStreamObject(libCtx, VtStreamImplFile,
        (Pointer)&fileInfo, tempStream);
    }
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, 0,
    fnctLine, "VoltSecureArchiveCreateTempStream", (unsigned char*)0)
    
  return status;
}

int VoltSecureArchiveFormatEntryExpression(
  VtLibCtx libCtx,
  unsigned int entryIndex,
  const unsigned char* attributeName,
  unsigned char* expression,
  unsigned int expressionSize
)
{
  int status = 0;
  unsigned int length;
  unsigned char* p;
  VOLT_DECLARE_FNCT_LINE(fnctLine)

  VT_ASSERT(libCtx != (VtLibCtx)0);
  VT_ASSERT(attributeName != (unsigned char*)0);
  VT_ASSERT(expression != (unsigned char*)0);
  
  do
  {
    /* Copy over the top-level entry array node name to the
     * expression. And the opening bracket for the array index.
     */
    length = Z2Strlen(VoltSecureArchiveEntryListAttributeName);
    
    VT_ASSERT(expressionSize > length + 10);
    
    Z2Memcpy(expression, VoltSecureArchiveEntryListAttributeName, length);
    p = expression + length;
    *p++ = '[';
    
    /* Convert the entryIndex to a string in the num buffer. We
     * work backwards in the buffer, starting with the null
     * terminator.
     */
    VOLT_SET_FNCT_LINE(fnctLine)
    status = VoltNumToDecimalString(entryIndex, p,
      expression + expressionSize - p, libCtx);
    if (status != 0)
      break;
    length = Z2Strlen(p);
    p += length;
    
    *p++ = ']';
    *p++ = '.';
    
    /* Now append the entry-level expression. Currently this
     * should just be a simple name, but in theory it could be
     * an expression (i.e. with nested elements). We also do a
     * check for the length of the name passed in to make sure
     * we won't overflow the buffer we allocated on the stack.
     */
    length = Z2Strlen(attributeName);
    if (length >= (unsigned int) (expression + expressionSize - p))
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_BUFFER_TOO_SMALL;
      break;
    }
    Z2Memcpy(p, attributeName, length);
    p += length;
    *p++ = 0;
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, 0,
    fnctLine, "VoltSecureArchiveFormatEntryExpression", (unsigned char*)0)
    
  return status;
}

int VoltSecureArchiveHasConsecutiveEOL(
  const unsigned char* text
)
{
  const unsigned char* p;
  unsigned char previousEOL = 0;
  unsigned char c;
  
  if (text != (const unsigned char*)0)
  {
    p = text;
    while ((c = *p++) != 0)
    {
      if ((c == '\r') || (c == '\n'))
      {
        if (previousEOL)
          return 1;
        if ((c == '\r') && (*p == '\n'))
          p++;
        previousEOL = 1;
      }
      else
      {
        previousEOL = 0;
      }
    }
  }
  
  return 0;
}