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Updating with new functions and adding "C" style entrypoint library with example application.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8564 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jcarsey
2009-06-16 00:23:19 +00:00
parent 14e96c2996
commit b1f95a06ca
11 changed files with 700 additions and 49 deletions
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304
ShellPkg/Library/BaseFileHandleLib/BaseFileHandleLib.c
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@ -14,11 +14,14 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Uefi.h>
#include <Library/ShellLib.h>
#include <Protocol/SimpleFileSystem.h>
#include <Guid/FileInfo.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Protocol/SimpleFileSystem.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#define MAX_FILE_NAME_LEN 522 // (20 * (6+5+2))+1) unicode characters from EFI FAT spec (doubled for bytes)
#define FIND_XXXXX_FILE_BUFFER_SIZE (SIZE_OF_EFI_FILE_INFO + MAX_FILE_NAME_LEN)
@ -620,4 +623,297 @@ FileHandleGetSize (
FreePool(FileInfo);
return (EFI_SUCCESS);
}
}
/**
Safely append (on the left) with automatic string resizing given length of Destination and
desired length of copy from Source.
append the first D characters of Source to the end of Destination, where D is
the lesser of Count and the StrLen() of Source. If appending those D characters
will fit within Destination (whose Size is given as CurrentSize) and
still leave room for a null terminator, then those characters are appended,
starting at the original terminating null of Destination, and a new terminating
null is appended.
If appending D characters onto Destination will result in a overflow of the size
given in CurrentSize the string will be grown such that the copy can be performed
and CurrentSize will be updated to the new size.
If Source is NULL, there is nothing to append, just return the current buffer in
Destination.
if Destination is NULL, then ASSERT()
if Destination's current length (including NULL terminator) is already more then
CurrentSize, then ASSERT()
@param[in][out] Destination The String to append onto
@param[in][out] CurrentSize on call the number of bytes in Destination. On
return possibly the new size (still in bytes). if NULL
then allocate whatever is needed.
@param[in] Source The String to append from
@param[in] Count Maximum number of characters to append. if 0 then
all are appended.
@return Destination return the resultant string.
**/
CHAR16*
EFIAPI
StrnCatGrowLeft (
IN OUT CHAR16 **Destination,
IN OUT UINTN *CurrentSize,
IN CONST CHAR16 *Source,
IN UINTN Count
){
UINTN DestinationStartSize;
UINTN NewSize;
//
// ASSERTs
//
ASSERT(Destination != NULL);
//
// If there's nothing to do then just return Destination
//
if (Source == NULL) {
return (*Destination);
}
//
// allow for NULL pointers address as Destination
//
if (*Destination != NULL) {
ASSERT(CurrentSize != 0);
DestinationStartSize = StrSize(*Destination);
ASSERT(DestinationStartSize <= *CurrentSize);
} else {
DestinationStartSize = 0;
// ASSERT(*CurrentSize == 0);
}
//
// Append all of Source?
//
if (Count == 0) {
Count = StrLen(Source);
}
//
// Test and grow if required
//
if (CurrentSize != NULL) {
NewSize = *CurrentSize;
while (NewSize < (DestinationStartSize + (Count*sizeof(CHAR16)))) {
NewSize += 2 * Count * sizeof(CHAR16);
}
*Destination = ReallocatePool(*CurrentSize, NewSize, *Destination);
*CurrentSize = NewSize;
} else {
*Destination = AllocateZeroPool((Count+1)*sizeof(CHAR16));
}
*Destination = CopyMem(*Destination+StrLen(Source), *Destination, StrSize(*Destination));
*Destination = CopyMem(*Destination, Source, StrLen(Source));
return (*Destination);
}
/**
Function to get a full filename given a EFI_FILE_HANDLE somewhere lower on the
directory 'stack'.
if Handle is NULL, return EFI_INVALID_PARAMETER
@param[in] Handle Handle to the Directory or File to create path to.
@param[out] FullFileName pointer to pointer to generated full file name. It
is the responsibility of the caller to free this memory
with a call to FreePool().
@retval EFI_SUCCESS the operation was sucessful and the FullFileName is valid.
@retval EFI_INVALID_PARAMETER Handle was NULL.
@retval EFI_INVALID_PARAMETER FullFileName was NULL.
@retval EFI_OUT_OF_RESOURCES a memory allocation failed.
**/
EFI_STATUS
EFIAPI
FileHandleGetFileName (
IN CONST EFI_FILE_HANDLE Handle,
OUT CHAR16 **FullFileName
){
EFI_STATUS Status;
UINTN Size;
EFI_FILE_HANDLE CurrentHandle;
EFI_FILE_HANDLE NextHigherHandle;
EFI_FILE_INFO *FileInfo;
Size = 0;
*FullFileName = NULL;
//
// Check our parameters
//
if (FullFileName == NULL || Handle == NULL) {
return (EFI_INVALID_PARAMETER);
}
Status = Handle->Open(Handle, &CurrentHandle, L".", EFI_FILE_MODE_READ, 0);
if (!EFI_ERROR(Status)) {
//
// Reverse out the current directory on the device
//
for (;;) {
FileInfo = FileHandleGetInfo(CurrentHandle);
if (FileInfo == NULL) {
Status = EFI_OUT_OF_RESOURCES;
break;
} else {
//
// We got info... do we have a name? if yes preceed the current path with it...
//
if (StrLen (FileInfo->FileName) == 0) {
*FullFileName = StrnCatGrowLeft(FullFileName, &Size, L"\\", 0);
FreePool(FileInfo);
break;
} else {
*FullFileName = StrnCatGrowLeft(FullFileName, &Size, FileInfo->FileName, 0);
*FullFileName = StrnCatGrowLeft(FullFileName, &Size, L"\\", 0);
FreePool(FileInfo);
}
}
//
// Move to the parent directory
//
Status = CurrentHandle->Open (CurrentHandle, &NextHigherHandle, L"..", EFI_FILE_MODE_READ, 0);
if (EFI_ERROR (Status)) {
break;
}
FileHandleClose(CurrentHandle);
CurrentHandle = NextHigherHandle;
}
}
if (CurrentHandle != NULL) {
CurrentHandle->Close (CurrentHandle);
}
if (EFI_ERROR(Status) && *FullFileName != NULL) {
FreePool(FullFileName);
}
return (Status);
}
/**
Function to read a single line (up to but not including the \n) from a file.
@param[in] Handle FileHandle to read from
@param[in][out] Buffer pointer to buffer to read into
@param[in][out] Size pointer to number of bytes in buffer
@param[in[ Truncate if TRUE then allows for truncation of the line to fit.
if FALSE will reset the position to the begining of the
line if the buffer is not large enough.
@retval EFI_SUCCESS the operation was sucessful. the line is stored in
Buffer.
@retval EFI_INVALID_PARAMETER Handle was NULL.
@retval EFI_INVALID_PARAMETER Buffer was NULL.
@retval EFI_INVALID_PARAMETER Size was NULL.
@retval EFI_BUFFER_TOO_SMALL Size was not enough space to store the line.
Size was updated to minimum space required.
@sa FileHandleRead
**/
EFI_STATUS
EFIAPI
FileHandleReadLine(
IN EFI_FILE_HANDLE Handle,
IN OUT VOID *Buffer,
IN OUT UINTN *Size,
IN BOOLEAN Truncate
){
EFI_STATUS Status;
CHAR16 CharBuffer;
UINTN CharSize;
UINTN CountSoFar;
UINT64 Position;
if (Handle == NULL
||Buffer == NULL
||Size == NULL
){
return (EFI_INVALID_PARAMETER);
}
FileHandleGetPosition(Handle, &Position);
for (CountSoFar = 0;;CountSoFar++){
CharSize = sizeof(CharBuffer);
Status = FileHandleRead(Handle, &CharSize, &CharBuffer);
if ( EFI_ERROR(Status)
|| CharSize == 0
|| CharBuffer == '\n'
){
break;
}
//
// if we have space save it...
//
if ((CountSoFar+1)*sizeof(CHAR16) < *Size){
((CHAR16*)Buffer)[CountSoFar] = CharBuffer;
((CHAR16*)Buffer)[CountSoFar+1] = '\0';
}
}
//
// if we ran out of space tell when...
//
if ((CountSoFar+1)*sizeof(CHAR16) > *Size){
*Size = (CountSoFar+1)*sizeof(CHAR16);
if (Truncate == FALSE) {
FileHandleSetPosition(Handle, Position);
} else {
DEBUG((DEBUG_WARN, "The line was truncated in ReadLine"));
}
return (EFI_BUFFER_TOO_SMALL);
}
*Size = (CountSoFar+1)*sizeof(CHAR16);
return (Status);
}
/**
function to write a line of unicode text to a file.
if Handle is NULL, ASSERT.
if Buffer is NULL, do nothing. (return SUCCESS)
@param[in] Handle FileHandle to write to
@param[in] Buffer Buffer to write
@retval EFI_SUCCESS the data was written.
@retval other failure.
@sa FileHandleWrite
**/
EFI_STATUS
EFIAPI
FileHandleWriteLine(
IN EFI_FILE_HANDLE Handle,
IN CHAR16 *Buffer
){
EFI_STATUS Status;
UINTN Size;
ASSERT(Handle != NULL);
if (Buffer == NULL) {
return (EFI_SUCCESS);
}
Size = StrLen(Buffer);
Status = FileHandleWrite(Handle, &Size, Buffer);
if (EFI_ERROR(Status)) {
return (Status);
}
Size = StrLen(L"\r\n");
return FileHandleWrite(Handle, &Size, L"\r\n");
}