LZRead

The LZRead function reads (at most) the specified number of bytes from a file and copies them into a buffer.

INT LZRead(

INT hFile,	// LZ file handle of file
LPSTR lpBuffer,	// address of buffer for bytes
INT cbRead	// count of bytes
);

Parameters

hFile

Identifies the source file.

lpBuffer

Points to a buffer that receives the bytes read from the file.

cbRead

Specifies the count of bytes to be read.

Return Values

If the function succeeds, the return value specifies the number of bytes read.

If the function fails, the return value is an LZERROR_* code. These codes have values less than zero. Note that LZRead calls neither SetLastError nor SetLastErrorEx; thus, its failure does not affect a thread's last-error code.

Here is a list of the LZERROR_* codes that LZRead can return upon failure:

Value	Meaning
LZERROR_BADINHANDLE	The handle identifying the source file is not valid. The file cannot be read.
LZERROR_BADOUTHANDLE	The handle identifying the destination file is not valid. The file cannot be written.
LZERROR_BADVALUE	One of the input parameters is not valid.
LZERROR_GLOBALLOC	The maximum number of open compressed files has been exceeded or local memory cannot be allocated.
LZERROR_GLOBLOCK	The LZ file handle cannot be locked down.
LZERROR_READ	The source file format is not valid.
LZERROR_WRITE	There is insufficient space for the output file.

Remarks

The handle identifying the file must be retrieved by calling either the LZInit or LZOpenFile function.

If the file is compressed, LZRead emulates the _lread function on an expanded image of the file and copies the bytes of data into the specified buffer.

Applications must call the LZOpenFile, LZSeek, and LZRead functions instead of the OpenFile, _llseek, and _lread functions.

See Also

LZInit, LZOpenFile, LZSeek

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