ResolutionParsing.c

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#include <Library/BaseLib.h>
#include <Library/BaseOverflowLib.h>
#include <Library/DebugLib.h>
#include <Library/OcConsoleLib.h>
 
STATIC
VOID
ParseResolution (
  IN  CONST CHAR8  *String,
  OUT UINT32       *Width,
  OUT UINT32       *Height,
  OUT UINT32       *Bpp OPTIONAL,
  OUT BOOLEAN      *Max
  )
{
  UINT32  TmpWidth;
  UINT32  TmpHeight;
 
  *Width  = 0;
  *Height = 0;
  *Max    = FALSE;
 
  if (Bpp != NULL) {
    *Bpp = 0;
  }
 
  if (AsciiStrCmp (String, "Max") == 0) {
    *Max = TRUE;
    return;
  }
 
  if ((*String == '\0') || (*String < '0') || (*String > '9')) {
    return;
  }
 
  TmpWidth = TmpHeight = 0;
 
  while (*String >= '0' && *String <= '9') {
    if (BaseOverflowMulAddU32 (TmpWidth, 10, *String++ - '0', &TmpWidth)) {
      return;
    }
  }
 
  if ((*String++ != 'x') || (*String < '0') || (*String > '9')) {
    return;
  }
 
  while (*String >= '0' && *String <= '9') {
    if (BaseOverflowMulAddU32 (TmpHeight, 10, *String++ - '0', &TmpHeight)) {
      return;
    }
  }
 
  if ((*String != '\0') && ((*String != '@') || (Bpp == NULL))) {
    return;
  }
 
  *Width  = TmpWidth;
  *Height = TmpHeight;
 
  if (*String == '\0') {
    return;
  }
 
  TmpWidth = 0;
  while (*String >= '0' && *String <= '9') {
    if (BaseOverflowMulAddU32 (TmpWidth, 10, *String++ - '0', &TmpWidth)) {
      return;
    }
  }
 
  if (*String != '\0') {
    return;
  }
 
  *Bpp = TmpWidth;
}
 
VOID
OcParseScreenResolution (
  IN  CONST CHAR8  *String,
  OUT UINT32       *Width,
  OUT UINT32       *Height,
  OUT UINT32       *Bpp,
  OUT BOOLEAN      *Max
  )
{
  ASSERT (String != NULL);
  ASSERT (Width != NULL);
  ASSERT (Height != NULL);
  ASSERT (Bpp != NULL);
  ASSERT (Max != NULL);
 
  ParseResolution (String, Width, Height, Bpp, Max);
}
 
VOID
OcParseConsoleMode (
  IN  CONST CHAR8  *String,
  OUT UINT32       *Width,
  OUT UINT32       *Height,
  OUT BOOLEAN      *Max
  )
{
  ASSERT (String != NULL);
  ASSERT (Width != NULL);
  ASSERT (Height != NULL);
  ASSERT (Max != NULL);
 
  ParseResolution (String, Width, Height, NULL, Max);
}