Compress2 Function
Compresses data given the compression context, input buffer, output buffer, compression level, and compression operation.
Syntax
HRESULT WINAPI Compress2(
IN OUT PVOID context,
IN CONST BYTE* input_buffer,
IN LONG input_buffer_size,
IN PBYTE output_buffer,
IN LONG output_buffer_size,
OUT PLONG input_used,
OUT PLONG output_used,
IN INT compression_level,
IN INT operation
);
Parameters
context
[IN][OUT] Pointer to the new compression context.
input_buffer
[IN] Pointer to the input buffer.
input_buffer_size
[IN] The size of the input buffer.
output_buffer
[IN] Pointer to the output buffer.
output_buffer_size
[IN] Size of the output buffer.
input_used
[IN] Amount of input buffer used.
output_used
[OUT] Amount of output buffer used.
compression_level
[IN] Compression level.
operation
[IN] Compression operation. It can be one of the following values:
| Identifier | Value | Description |
|---|---|---|
| IIS_COMPRESSION_OPERATION_PROCESS | 0 | Process input data. The encoder may choose to buffer the data and postpone flushing output. |
| IIS_COMPRESSION_OPERATION_FLUSH | 1 | Flush all pending output data buffered in the encoder. Flush is performed when the available input data is depleted. |
| IIS_COMPRESSION_OPERATION_FINISH | 2 | Finalize the stream. Finalization happens when the input stream reaches the end |
Return Value
An HRESULT. Possible values include, but are not limited to, those in the following table.
| Value | Description |
|---|---|
| S_OK | Indicates that the operation was successful. |
| S_FALSE | Indicates that all the available input data has been processed and all the output data has been produced. |
Remarks
When used with IIS, this method is called repeatedly until all the data required to fulfill the request is compressed.
Requirements
| Type | Description |
|---|---|
| Client | - |
| Server | - |
| Product | - |
| Header | Httpcompression.h |