rdpgfx_common.c

 
#include <freerdp/config.h>
 
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/stream.h>
 
#include "rdpgfx_common.h"
 
UINT rdpgfx_read_header(wLog* log, wStream* s, RDPGFX_HEADER* header, size_t* pPacketLength)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(header);
 
  if (pPacketLength)
    *pPacketLength = 0;
 
  if (!Stream_CheckAndLogRequiredLengthWLog(log, s, 8))
    return ERROR_INVALID_DATA;
 
  Stream_Read_UINT16(s, header->cmdId);     /* cmdId (2 bytes) */
  Stream_Read_UINT16(s, header->flags);     /* flags (2 bytes) */
  Stream_Read_UINT32(s, header->pduLength); /* pduLength (4 bytes) */
 
  if (header->pduLength < 8)
  {
    WLog_Print(log, WLOG_ERROR, "header->pduLength %u less than 8!", header->pduLength);
    return ERROR_INVALID_DATA;
  }
 
  const size_t size = (header->pduLength - 8ull);
  if (!Stream_CheckAndLogRequiredLengthWLog(log, s, size))
    return ERROR_INVALID_DATA;
  if (pPacketLength)
    *pPacketLength = size;
 
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_write_header(wStream* s, const RDPGFX_HEADER* header)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(header);
 
  if (!Stream_EnsureRemainingCapacity(s, 8))
    return CHANNEL_RC_NO_MEMORY;
  Stream_Write_UINT16(s, header->cmdId);     /* cmdId (2 bytes) */
  Stream_Write_UINT16(s, header->flags);     /* flags (2 bytes) */
  Stream_Write_UINT32(s, header->pduLength); /* pduLength (4 bytes) */
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_read_point16(wLog* log, wStream* s, RDPGFX_POINT16* pt16)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(pt16);
 
  if (!Stream_CheckAndLogRequiredLengthWLog(log, s, 4))
    return ERROR_INVALID_DATA;
 
  Stream_Read_UINT16(s, pt16->x); /* x (2 bytes) */
  Stream_Read_UINT16(s, pt16->y); /* y (2 bytes) */
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_write_point16(wStream* s, const RDPGFX_POINT16* point16)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(point16);
 
  if (!Stream_EnsureRemainingCapacity(s, 4))
    return CHANNEL_RC_NO_MEMORY;
 
  Stream_Write_UINT16(s, point16->x); /* x (2 bytes) */
  Stream_Write_UINT16(s, point16->y); /* y (2 bytes) */
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_read_rect16(wLog* log, wStream* s, RECTANGLE_16* rect16)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(rect16);
 
  if (!Stream_CheckAndLogRequiredLengthWLog(log, s, 8))
    return ERROR_INVALID_DATA;
 
  Stream_Read_UINT16(s, rect16->left);   /* left (2 bytes) */
  Stream_Read_UINT16(s, rect16->top);    /* top (2 bytes) */
  Stream_Read_UINT16(s, rect16->right);  /* right (2 bytes) */
  Stream_Read_UINT16(s, rect16->bottom); /* bottom (2 bytes) */
  if (rect16->left >= rect16->right)
  {
    WLog_Print(log, WLOG_ERROR, "Invalid RECTANGLE_16: left(%" PRIu16 ") > right(%" PRIu16 ")",
               rect16->left, rect16->right);
    return ERROR_INVALID_DATA;
  }
  if (rect16->top >= rect16->bottom)
  {
    WLog_Print(log, WLOG_ERROR, "Invalid RECTANGLE_16: top(%" PRIu16 ") > bottom(%" PRIu16 ")",
               rect16->top, rect16->bottom);
    return ERROR_INVALID_DATA;
  }
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_write_rect16(wStream* s, const RECTANGLE_16* rect16)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(rect16);
 
  if (!Stream_EnsureRemainingCapacity(s, 8))
    return CHANNEL_RC_NO_MEMORY;
 
  Stream_Write_UINT16(s, rect16->left);   /* left (2 bytes) */
  Stream_Write_UINT16(s, rect16->top);    /* top (2 bytes) */
  Stream_Write_UINT16(s, rect16->right);  /* right (2 bytes) */
  Stream_Write_UINT16(s, rect16->bottom); /* bottom (2 bytes) */
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_read_color32(wLog* log, wStream* s, RDPGFX_COLOR32* color32)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(color32);
 
  if (!Stream_CheckAndLogRequiredLengthWLog(log, s, 4))
    return ERROR_INVALID_DATA;
 
  Stream_Read_UINT8(s, color32->B);  /* B (1 byte) */
  Stream_Read_UINT8(s, color32->G);  /* G (1 byte) */
  Stream_Read_UINT8(s, color32->R);  /* R (1 byte) */
  Stream_Read_UINT8(s, color32->XA); /* XA (1 byte) */
  return CHANNEL_RC_OK;
}
 
UINT rdpgfx_write_color32(wStream* s, const RDPGFX_COLOR32* color32)
{
  WINPR_ASSERT(s);
  WINPR_ASSERT(color32);
 
  if (!Stream_EnsureRemainingCapacity(s, 4))
    return CHANNEL_RC_NO_MEMORY;
 
  Stream_Write_UINT8(s, color32->B);  /* B (1 byte) */
  Stream_Write_UINT8(s, color32->G);  /* G (1 byte) */
  Stream_Write_UINT8(s, color32->R);  /* R (1 byte) */
  Stream_Write_UINT8(s, color32->XA); /* XA (1 byte) */
  return CHANNEL_RC_OK;
}