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-rw-r--r--src/decoder/DecoderBuffer.cxx92
1 files changed, 23 insertions, 69 deletions
diff --git a/src/decoder/DecoderBuffer.cxx b/src/decoder/DecoderBuffer.cxx
index 7902e6e89..b2320032b 100644
--- a/src/decoder/DecoderBuffer.cxx
+++ b/src/decoder/DecoderBuffer.cxx
@@ -21,33 +21,19 @@
#include "DecoderBuffer.hxx"
#include "DecoderAPI.hxx"
#include "util/ConstBuffer.hxx"
-#include "util/VarSize.hxx"
+#include "util/DynamicFifoBuffer.hxx"
#include <assert.h>
-#include <string.h>
-#include <stdlib.h>
struct DecoderBuffer {
Decoder *decoder;
InputStream *is;
- /** the allocated size of the buffer */
- size_t size;
-
- /** the current length of the buffer */
- size_t length;
-
- /** number of bytes already consumed at the beginning of the
- buffer */
- size_t consumed;
-
- /** the actual buffer (dynamic size) */
- unsigned char data[sizeof(size_t)];
+ DynamicFifoBuffer<uint8_t> buffer;
DecoderBuffer(Decoder *_decoder, InputStream &_is,
size_t _size)
- :decoder(_decoder), is(&_is),
- size(_size), length(0), consumed(0) {}
+ :decoder(_decoder), is(&_is), buffer(_size) {}
};
DecoderBuffer *
@@ -56,9 +42,7 @@ decoder_buffer_new(Decoder *decoder, InputStream &is,
{
assert(size > 0);
- return NewVarSize<DecoderBuffer>(sizeof(DecoderBuffer::data),
- size,
- decoder, is, size);
+ return new DecoderBuffer(decoder, is, size);
}
void
@@ -66,7 +50,7 @@ decoder_buffer_free(DecoderBuffer *buffer)
{
assert(buffer != nullptr);
- DeleteVarSize(buffer);
+ delete buffer;
}
const InputStream &
@@ -78,73 +62,48 @@ decoder_buffer_get_stream(const DecoderBuffer *buffer)
void
decoder_buffer_clear(DecoderBuffer *buffer)
{
- buffer->length = buffer->consumed = 0;
-}
-
-static void
-decoder_buffer_shift(DecoderBuffer *buffer)
-{
- assert(buffer->consumed > 0);
-
- buffer->length -= buffer->consumed;
- memmove(buffer->data, buffer->data + buffer->consumed, buffer->length);
- buffer->consumed = 0;
+ buffer->buffer.Clear();
}
bool
decoder_buffer_fill(DecoderBuffer *buffer)
{
- size_t nbytes;
-
- if (buffer->consumed > 0)
- decoder_buffer_shift(buffer);
-
- if (buffer->length >= buffer->size)
+ auto w = buffer->buffer.Write();
+ if (w.IsEmpty())
/* buffer is full */
return false;
- nbytes = decoder_read(buffer->decoder, *buffer->is,
- buffer->data + buffer->length,
- buffer->size - buffer->length);
+ size_t nbytes = decoder_read(buffer->decoder, *buffer->is,
+ w.data, w.size);
if (nbytes == 0)
/* end of file, I/O error or decoder command
received */
return false;
- buffer->length += nbytes;
- assert(buffer->length <= buffer->size);
-
+ buffer->buffer.Append(nbytes);
return true;
}
-static const void *
-decoder_buffer_head(const DecoderBuffer *buffer)
-{
- return buffer->data + buffer->consumed;
-}
-
size_t
decoder_buffer_available(const DecoderBuffer *buffer)
{
- return buffer->length - buffer->consumed;
+ return buffer->buffer.GetAvailable();
}
ConstBuffer<void>
decoder_buffer_read(const DecoderBuffer *buffer)
{
- return {
- decoder_buffer_head(buffer),
- decoder_buffer_available(buffer),
- };
+ auto r = buffer->buffer.Read();
+ return { r.data, r.size };
}
ConstBuffer<void>
decoder_buffer_need(DecoderBuffer *buffer, size_t min_size)
{
while (true) {
- const auto available = decoder_buffer_available(buffer);
- if (available >= min_size)
- return { decoder_buffer_head(buffer), available };
+ const auto r = decoder_buffer_read(buffer);
+ if (r.size >= min_size)
+ return r;
if (!decoder_buffer_fill(buffer))
return nullptr;
@@ -154,25 +113,20 @@ decoder_buffer_need(DecoderBuffer *buffer, size_t min_size)
void
decoder_buffer_consume(DecoderBuffer *buffer, size_t nbytes)
{
- /* just move the "consumed" pointer - decoder_buffer_shift()
- will do the real work later (called by
- decoder_buffer_fill()) */
- buffer->consumed += nbytes;
-
- assert(buffer->consumed <= buffer->length);
+ buffer->buffer.Consume(nbytes);
}
bool
decoder_buffer_skip(DecoderBuffer *buffer, size_t nbytes)
{
- const size_t available = decoder_buffer_available(buffer);
- if (available >= nbytes) {
- decoder_buffer_consume(buffer, nbytes);
+ const auto r = buffer->buffer.Read();
+ if (r.size >= nbytes) {
+ buffer->buffer.Consume(nbytes);
return true;
}
- decoder_buffer_clear(buffer);
- nbytes -= available;
+ buffer->buffer.Clear();
+ nbytes -= r.size;
return decoder_skip(buffer->decoder, *buffer->is, nbytes);
}