From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 29 Aug 2021 08:54:20 +0000 (+0300)
Subject: Use size_t for sizes in I/O classes
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=c8bf2d6c15893ccc9dbc4e04611b7229029f4808

Use size_t for sizes in I/O classes
---

diff --git a/source/fs/unix/filemonitor.cpp b/source/fs/unix/filemonitor.cpp
index 70cfc4e..68cd7ae 100644
--- a/source/fs/unix/filemonitor.cpp
+++ b/source/fs/unix/filemonitor.cpp
@@ -36,13 +36,13 @@ void INotify::remove_watch(int wd)
 		throw system_error("inotify_rm_watch");
 }
 
-unsigned INotify::do_write(const char *, unsigned)
+size_t INotify::do_write(const char *, size_t)
 {
 	check_access(IO::M_WRITE);
 	return 0;
 }
 
-unsigned INotify::do_read(char *buf, unsigned size)
+size_t INotify::do_read(char *buf, size_t size)
 {
 	return IO::sys_read(fd, buf, size);
 }
diff --git a/source/fs/unix/filemonitor_platform.h b/source/fs/unix/filemonitor_platform.h
index 31b728f..ed900bf 100644
--- a/source/fs/unix/filemonitor_platform.h
+++ b/source/fs/unix/filemonitor_platform.h
@@ -20,8 +20,8 @@ public:
 	virtual void set_inherit(bool) { }
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 
 public:
 	virtual const IO::Handle &get_handle(IO::Mode) { return fd; }
diff --git a/source/io/base.h b/source/io/base.h
index b6d1ff6..7bd5bd9 100644
--- a/source/io/base.h
+++ b/source/io/base.h
@@ -1,6 +1,7 @@
 #ifndef MSP_IO_BASE_H_
 #define MSP_IO_BASE_H_
 
+#include <cstddef>
 #include <sigc++/sigc++.h>
 #include <msp/core/mutex.h>
 #include <msp/core/noncopyable.h>
@@ -69,25 +70,25 @@ public:
 protected:
 	void check_access(Mode) const;
 
-	virtual unsigned do_write(const char *, unsigned) = 0;
-	virtual unsigned do_read(char *, unsigned) = 0;
+	virtual std::size_t do_write(const char *, std::size_t) = 0;
+	virtual std::size_t do_read(char *, std::size_t) = 0;
 
 public:
 	/** Writes data from a buffer.  Subject to blocking.  Returns the number of
 	bytes written, which may be zero for a non-blockin operation. */
-	unsigned write(const char *b, unsigned c) { return do_write(b, c); }
+	std::size_t write(const char *b, std::size_t c) { return do_write(b, c); }
 
 	/** Writes a string.  This is identical to calling
 	write(s.data(), s.size()). */
-	unsigned write(const std::string &s) { return do_write(s.data(), s.size()); }
+	std::size_t write(const std::string &s) { return do_write(s.data(), s.size()); }
 
 	/** Writes a single character.  This is identical to calling
 	write(&c, 1). */
-	virtual unsigned put(char c) { return do_write(&c, 1); }
+	virtual std::size_t put(char c) { return do_write(&c, 1); }
 
 	/** Reads data into a buffer.  Subject to blocking.  Returns the number of
 	bytes read, which may be zero for a non-blocking operation. */
-	unsigned read(char *b, unsigned c) { return do_read(b, c); }
+	std::size_t read(char *b, std::size_t c) { return do_read(b, c); }
 
 	/** Reads characters up to the next linefeed or end-of-file.  The linefeed
 	is not included in the line.  Returns true if a line was successfully read,
diff --git a/source/io/buffered.cpp b/source/io/buffered.cpp
index 2836e4b..55c69a6 100644
--- a/source/io/buffered.cpp
+++ b/source/io/buffered.cpp
@@ -61,7 +61,7 @@ void Buffered::flush()
 		begin = end = buf;
 }
 
-unsigned Buffered::do_write(const char *data, unsigned size)
+size_t Buffered::do_write(const char *data, size_t size)
 {
 	set_op(M_WRITE);
 
@@ -92,7 +92,7 @@ unsigned Buffered::do_write(const char *data, unsigned size)
 	}
 }
 
-unsigned Buffered::do_read(char *data, unsigned size)
+size_t Buffered::do_read(char *data, size_t size)
 {
 	set_op(M_READ);
 
@@ -110,7 +110,7 @@ unsigned Buffered::do_read(char *data, unsigned size)
 	{
 		// Give out whatever is in the buffer already
 		memcpy(data, begin, end-begin);
-		unsigned ret = end-begin;
+		size_t ret = end-begin;
 		begin = end = buf;
 
 		data += ret;
@@ -119,10 +119,10 @@ unsigned Buffered::do_read(char *data, unsigned size)
 		if(size<buf_size)
 		{
 			// Fill the buffer and serve the rest of the request from it
-			unsigned len = below.read(end, buf+buf_size-end);
+			size_t len = below.read(end, buf+buf_size-end);
 			end += len;
 
-			len = min(static_cast<unsigned>(end-begin), size);
+			len = min<size_t>(end-begin, size);
 			memcpy(data, begin, len);
 			begin += len;
 			ret += len;
@@ -137,7 +137,7 @@ unsigned Buffered::do_read(char *data, unsigned size)
 	}
 }
 
-unsigned Buffered::put(char c)
+size_t Buffered::put(char c)
 {
 	set_op(M_WRITE);
 
@@ -190,7 +190,7 @@ void Buffered::set_op(Mode op)
 	cur_op = op;
 }
 
-unsigned Buffered::get_current_size() const
+size_t Buffered::get_current_size() const
 {
 	return end-begin;
 }
diff --git a/source/io/buffered.h b/source/io/buffered.h
index da917e0..cd742fe 100644
--- a/source/io/buffered.h
+++ b/source/io/buffered.h
@@ -11,7 +11,7 @@ class Buffered: public Base, public sigc::trackable
 {
 private:
 	Base &below;
-	unsigned buf_size;
+	std::size_t buf_size;
 	char *buf;
 	char *begin;
 	char *end;
@@ -27,10 +27,10 @@ public:
 	void flush();
 
 protected:
-	unsigned do_write(const char *, unsigned);
-	unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 public:
-	unsigned put(char);
+	virtual std::size_t put(char);
 
 	bool getline(std::string &);
 	int get();
@@ -41,7 +41,7 @@ private:
 	void set_op(Mode);
 public:
 	Mode get_current_op() const { return cur_op; }
-	unsigned get_current_size() const;
+	std::size_t get_current_size() const;
 };
 
 } // namespace IO
diff --git a/source/io/console.cpp b/source/io/console.cpp
index a7417ed..abb872d 100644
--- a/source/io/console.cpp
+++ b/source/io/console.cpp
@@ -28,18 +28,18 @@ void Console::set_inherit(bool i)
 	sys_set_inherit(handle, i);
 }
 
-unsigned Console::do_write(const char *buf, unsigned len)
+size_t Console::do_write(const char *buf, size_t len)
 {
 	check_access(M_WRITE);
 
 	return sys_write(handle, buf, len);
 }
 
-unsigned Console::do_read(char *buf, unsigned len)
+size_t Console::do_read(char *buf, size_t len)
 {
 	check_access(M_READ);
 
-	unsigned ret = sys_read(handle, buf, len);
+	size_t ret = sys_read(handle, buf, len);
 	if(ret==0)
 		set_eof();
 
diff --git a/source/io/console.h b/source/io/console.h
index 8feccfd..1200086 100644
--- a/source/io/console.h
+++ b/source/io/console.h
@@ -54,8 +54,8 @@ public:
 	void redirect(Base &);
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 
 public:
 	virtual const Handle &get_handle(Mode);
diff --git a/source/io/file.cpp b/source/io/file.cpp
index 74b9f9f..5ead278 100644
--- a/source/io/file.cpp
+++ b/source/io/file.cpp
@@ -38,7 +38,7 @@ void File::set_inherit(bool i)
 	sys_set_inherit(handle, i);
 }
 
-unsigned File::do_write(const char *buf, unsigned size)
+size_t File::do_write(const char *buf, size_t size)
 {
 	check_access(M_WRITE);
 
@@ -53,14 +53,14 @@ unsigned File::do_write(const char *buf, unsigned size)
 	return sys_write(handle, buf, size);
 }
 
-unsigned File::do_read(char *buf, unsigned size)
+size_t File::do_read(char *buf, size_t size)
 {
 	check_access(M_READ);
 
 	if(size==0)
 		return 0;
 
-	unsigned ret = sys_read(handle, buf, size);
+	size_t ret = sys_read(handle, buf, size);
 	if(ret==0)
 		set_eof();
 
@@ -107,23 +107,23 @@ void BufferedFile::set_inherit(bool)
 	throw logic_error("BufferedFile::set_inherit");
 }
 
-unsigned BufferedFile::do_write(const char *buf, unsigned size)
+size_t BufferedFile::do_write(const char *buf, size_t size)
 {
-	unsigned ret = buffer.write(buf, size);
+	size_t ret = buffer.write(buf, size);
 	position += ret;
 	return ret;
 }
 
-unsigned BufferedFile::do_read(char *buf, unsigned size)
+size_t BufferedFile::do_read(char *buf, size_t size)
 {
-	unsigned ret = buffer.read(buf, size);
+	size_t ret = buffer.read(buf, size);
 	position += ret;
 	return ret;
 }
 
-unsigned BufferedFile::put(char c)
+size_t BufferedFile::put(char c)
 {
-	unsigned ret = buffer.put(c);
+	size_t ret = buffer.put(c);
 	position += ret;
 	return ret;
 }
diff --git a/source/io/file.h b/source/io/file.h
index 85075d0..aeac6c8 100644
--- a/source/io/file.h
+++ b/source/io/file.h
@@ -61,8 +61,8 @@ public:
 	virtual void set_inherit(bool);
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 
 public:
 	virtual void sync();
@@ -97,10 +97,10 @@ public:
 	virtual void set_inherit(bool);
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 public:
-	virtual unsigned put(char);
+	virtual std::size_t put(char);
 
 	virtual bool getline(std::string &);
 	virtual int get();
diff --git a/source/io/handle.h b/source/io/handle.h
index 4b311f5..be2097e 100644
--- a/source/io/handle.h
+++ b/source/io/handle.h
@@ -1,6 +1,8 @@
 #ifndef MSP_IO_HANDLE_H_
 #define MSP_IO_HANDLE_H_
 
+#include <cstddef>
+
 namespace Msp {
 namespace IO {
 
@@ -30,8 +32,8 @@ public:
 
 void sys_set_blocking(Handle &, bool);
 void sys_set_inherit(Handle &, bool);
-unsigned sys_read(Handle &, char *, unsigned);
-unsigned sys_write(Handle &, const char *, unsigned);
+std::size_t sys_read(Handle &, char *, std::size_t);
+std::size_t sys_write(Handle &, const char *, std::size_t);
 void sys_close(Handle &);
 
 } // namespace IO
diff --git a/source/io/memory.cpp b/source/io/memory.cpp
index eaaaeb1..616150f 100644
--- a/source/io/memory.cpp
+++ b/source/io/memory.cpp
@@ -8,7 +8,7 @@ using namespace std;
 namespace Msp {
 namespace IO {
 
-Memory::Memory(char *d, unsigned s, Mode m)
+Memory::Memory(char *d, size_t s, Mode m)
 {
 	init(d, d+s, m);
 }
@@ -18,7 +18,7 @@ Memory::Memory(char *b, char *e, Mode m)
 	init(b, e, m);
 }
 
-Memory::Memory(const char *cd, unsigned s)
+Memory::Memory(const char *cd, size_t s)
 {
 	char *d = const_cast<char *>(cd);
 	init(d, d+s, M_READ);
@@ -47,17 +47,17 @@ void Memory::set_inherit(bool)
 	throw logic_error("Memory::set_inherit");
 }
 
-unsigned Memory::do_write(const char *buf, unsigned size)
+size_t Memory::do_write(const char *buf, size_t size)
 {
 	check_access(M_WRITE);
 
-	size = min<unsigned>(size, end-pos);
+	size = min<size_t>(size, end-pos);
 	memcpy(pos, buf, size);
 	pos += size;
 	return size;
 }
 
-unsigned Memory::do_read(char *buf, unsigned size)
+size_t Memory::do_read(char *buf, size_t size)
 {
 	check_access(M_READ);
 
@@ -67,13 +67,13 @@ unsigned Memory::do_read(char *buf, unsigned size)
 		return 0;
 	}
 
-	size = min<unsigned>(size, end-pos);
+	size = min<size_t>(size, end-pos);
 	memcpy(buf, pos, size);
 	pos += size;
 	return size;
 }
 
-unsigned Memory::put(char c)
+size_t Memory::put(char c)
 {
 	check_access(M_WRITE);
 
diff --git a/source/io/memory.h b/source/io/memory.h
index 4a6eca2..5b9961c 100644
--- a/source/io/memory.h
+++ b/source/io/memory.h
@@ -14,9 +14,9 @@ private:
 	char *pos;
 
 public:
-	Memory(char *, unsigned, Mode = M_RDWR);
+	Memory(char *, std::size_t, Mode = M_RDWR);
 	Memory(char *, char *, Mode = M_RDWR);
-	Memory(const char *, unsigned);
+	Memory(const char *, std::size_t);
 	Memory(const char *, const char *);
 private:
 	void init(char *, char *, Mode);
@@ -26,10 +26,10 @@ public:
 	virtual void set_inherit(bool);
 
 private:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 public:
-	virtual unsigned put(char);
+	virtual std::size_t put(char);
 	virtual bool getline(std::string &);
 	virtual int get();
 
diff --git a/source/io/pipe.cpp b/source/io/pipe.cpp
index 1301b3a..01bf20a 100644
--- a/source/io/pipe.cpp
+++ b/source/io/pipe.cpp
@@ -54,7 +54,7 @@ void Pipe::set_inherit(bool i)
 	sys_set_inherit(write_handle, i);
 }
 
-unsigned Pipe::do_write(const char *buf, unsigned size)
+size_t Pipe::do_write(const char *buf, size_t size)
 {
 	if(size==0)
 		return 0;
@@ -62,12 +62,12 @@ unsigned Pipe::do_write(const char *buf, unsigned size)
 	return sys_write(write_handle, buf, size);
 }
 
-unsigned Pipe::do_read(char *buf, unsigned size)
+size_t Pipe::do_read(char *buf, size_t size)
 {
 	if(size==0)
 		return 0;
 
-	unsigned ret = reader.read(buf, size);
+	size_t ret = reader.read(buf, size);
 	if(ret==0)
 		set_eof();
 
diff --git a/source/io/pipe.h b/source/io/pipe.h
index 098e119..5fc0b3d 100644
--- a/source/io/pipe.h
+++ b/source/io/pipe.h
@@ -27,8 +27,8 @@ public:
 	virtual void set_inherit(bool);
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 
 public:
 	virtual const Handle &get_handle(Mode);
diff --git a/source/io/slice.cpp b/source/io/slice.cpp
index 3fbfc57..4007a5e 100644
--- a/source/io/slice.cpp
+++ b/source/io/slice.cpp
@@ -57,39 +57,39 @@ unsigned Slice::prepare_op(unsigned size, Mode m)
 	return size;
 }
 
-unsigned Slice::do_write(const char *data, unsigned size)
+size_t Slice::do_write(const char *data, size_t size)
 {
 	Base::Synchronize sync(below);
 	size = prepare_op(size, M_WRITE);
 	if(!size)
 		return 0;
 
-	unsigned len = below.write(data, size);
+	size_t len = below.write(data, size);
 	position += len;
 	return len;
 }
 
-unsigned Slice::do_read(char *data, unsigned size)
+size_t Slice::do_read(char *data, size_t size)
 {
 	Base::Synchronize sync(below);
 	size = prepare_op(size, M_READ);
 	if(!size)
 		return 0;
 
-	unsigned len = below.read(data, size);
+	size_t len = below.read(data, size);
 	if(!len && below.eof())
 		set_eof();
 	position += len;
 	return len;
 }
 
-unsigned Slice::put(char c)
+size_t Slice::put(char c)
 {
 	Base::Synchronize sync(below);
 	if(!prepare_op(1, M_WRITE))
 		return 0;
 
-	unsigned len = below.put(c);
+	size_t len = below.put(c);
 	position += len;
 	return len;
 }
diff --git a/source/io/slice.h b/source/io/slice.h
index d5f0f74..8ca4327 100644
--- a/source/io/slice.h
+++ b/source/io/slice.h
@@ -36,11 +36,11 @@ private:
 
 	unsigned prepare_op(unsigned, Mode);
 protected:
-	virtual unsigned do_write(const char *, unsigned);
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
+	virtual std::size_t do_read(char *, std::size_t);
 
 public:
-	virtual unsigned put(char);
+	virtual std::size_t put(char);
 	virtual int get();
 
 	virtual const Handle &get_handle(Mode);
diff --git a/source/io/unix/handle.cpp b/source/io/unix/handle.cpp
index cbffa48..c9bf3b1 100644
--- a/source/io/unix/handle.cpp
+++ b/source/io/unix/handle.cpp
@@ -5,6 +5,8 @@
 #include "handle.h"
 #include "handle_private.h"
 
+using namespace std;
+
 namespace Msp {
 namespace IO {
 
@@ -20,9 +22,9 @@ void sys_set_inherit(Handle &handle, bool i)
 	fcntl(*handle, F_SETFD, (flags&~O_CLOEXEC)|(i?O_CLOEXEC:0));
 }
 
-unsigned sys_read(Handle &handle, char *buf, unsigned size)
+size_t sys_read(Handle &handle, char *buf, size_t size)
 {
-	int ret = read(*handle, buf, size);
+	ssize_t ret = read(*handle, buf, size);
 	if(ret==-1)
 	{
 		if(errno==EAGAIN)
@@ -34,9 +36,9 @@ unsigned sys_read(Handle &handle, char *buf, unsigned size)
 	return ret;
 }
 
-unsigned sys_write(Handle &handle, const char *buf, unsigned size)
+size_t sys_write(Handle &handle, const char *buf, size_t size)
 {
-	int ret = write(*handle, buf, size);
+	ssize_t ret = write(*handle, buf, size);
 	if(ret==-1)
 	{
 		if(errno==EAGAIN)
diff --git a/source/io/windows/handle.cpp b/source/io/windows/handle.cpp
index e59de27..1cdf8ce 100644
--- a/source/io/windows/handle.cpp
+++ b/source/io/windows/handle.cpp
@@ -1,7 +1,11 @@
+#define NOMINMAX
+#include <limits>
 #include <msp/core/systemerror.h>
 #include "handle.h"
 #include "handle_private.h"
 
+using namespace std;
+
 namespace Msp {
 namespace IO {
 
@@ -13,8 +17,11 @@ void sys_set_inherit(Handle &, bool)
 {
 }
 
-unsigned sys_read(Handle &handle, char *buf, unsigned size)
+size_t sys_read(Handle &handle, char *buf, size_t size)
 {
+	if(size>numeric_limits<DWORD>::max())
+		throw invalid_argument("read");
+
 	DWORD ret;
 	if(ReadFile(*handle, buf, size, &ret, 0)==0)
 		throw system_error("ReadFile");
@@ -22,8 +29,11 @@ unsigned sys_read(Handle &handle, char *buf, unsigned size)
 	return ret;
 }
 
-unsigned sys_write(Handle &handle, const char *buf, unsigned size)
+size_t sys_write(Handle &handle, const char *buf, size_t size)
 {
+	if(size>numeric_limits<DWORD>::max())
+		throw invalid_argument("write");
+
 	DWORD ret;
 	if(WriteFile(*handle, buf, size, &ret, 0)==0)
 		throw system_error("WriteFile");
diff --git a/source/io/zlibcompressed.cpp b/source/io/zlibcompressed.cpp
index 3ad4f22..f477bdc 100644
--- a/source/io/zlibcompressed.cpp
+++ b/source/io/zlibcompressed.cpp
@@ -141,15 +141,15 @@ void ZlibCompressed::flush()
 #endif
 }
 
-unsigned ZlibCompressed::do_write(const char *data, unsigned size)
+size_t ZlibCompressed::do_write(const char *data, size_t size)
 {
 	check_access(M_WRITE);
 
-	unsigned processed = 0;
+	size_t processed = 0;
 #ifdef WITH_ZLIB
 	while(processed<size)
 	{
-		unsigned free_in = (in_buffer+buffer_size-priv->stream.next_in);
+		size_t free_in = (in_buffer+buffer_size-priv->stream.next_in);
 		if(free_in<size && priv->stream.next_in>in_buffer)
 		{
 			// Not all of the data fits in the buffer, so make some more room
@@ -161,7 +161,7 @@ unsigned ZlibCompressed::do_write(const char *data, unsigned size)
 		if(free_in)
 		{
 			// Copy as much data into the input buffer as possible
-			unsigned len = min(free_in, size-processed);
+			size_t len = min(free_in, size-processed);
 			copy(data+processed, data+processed+len, priv->stream.next_in+priv->stream.avail_in);
 			priv->stream.avail_in += len;
 			processed += len;
@@ -196,12 +196,12 @@ bool ZlibCompressed::compress_data(int flush_mode)
 	}
 
 	// Write compressed data into the underlying object
-	unsigned len = 0;
+	size_t len = 0;
 	if(priv->stream.next_out>out_buffer)
 		len = below.write(reinterpret_cast<char *>(out_buffer), priv->stream.next_out-out_buffer);
 	if(len>0)
 	{
-		if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
+		if(len<static_cast<size_t>(priv->stream.next_out-out_buffer))
 			copy(out_buffer+len, priv->stream.next_out, out_buffer);
 		priv->stream.avail_out += len;
 		priv->stream.next_out -= len;
@@ -217,23 +217,23 @@ bool ZlibCompressed::compress_data(int flush_mode)
 #endif
 }
 
-unsigned ZlibCompressed::do_read(char *data, unsigned size)
+size_t ZlibCompressed::do_read(char *data, size_t size)
 {
 	check_access(M_READ);
 
-	unsigned processed = 0;
+	size_t processed = 0;
 #ifdef WITH_ZLIB
 	while(processed<size)
 	{
 		if(priv->stream.next_out>out_buffer)
 		{
 			// We have some pending output, give it out first
-			unsigned len = min<unsigned>(priv->stream.next_out-out_buffer, size-processed);
+			size_t len = min<size_t>(priv->stream.next_out-out_buffer, size-processed);
 
 			copy(out_buffer, out_buffer+len, data+processed);
 			processed += len;
 
-			if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
+			if(len<static_cast<size_t>(priv->stream.next_out-out_buffer))
 				copy(out_buffer+len, priv->stream.next_out, out_buffer);
 			priv->stream.next_out -= len;
 			priv->stream.avail_out += len;
@@ -261,7 +261,7 @@ unsigned ZlibCompressed::do_read(char *data, unsigned size)
 				copy(priv->stream.next_in, priv->stream.next_in+priv->stream.avail_in, in_buffer);
 			priv->stream.next_in = in_buffer;
 
-			unsigned len = below.read(reinterpret_cast<char *>(priv->stream.next_in), in_buffer+buffer_size-priv->stream.next_in);
+			size_t len = below.read(reinterpret_cast<char *>(priv->stream.next_in), in_buffer+buffer_size-priv->stream.next_in);
 			priv->stream.avail_in += len;
 			if(!len && below.eof())
 				stream_end = true;
diff --git a/source/io/zlibcompressed.h b/source/io/zlibcompressed.h
index af75aec..e4ae6e0 100644
--- a/source/io/zlibcompressed.h
+++ b/source/io/zlibcompressed.h
@@ -34,7 +34,7 @@ private:
 	struct Private;
 
 	Base &below;
-	unsigned buffer_size;
+	std::size_t buffer_size;
 	unsigned char *in_buffer;
 	unsigned char *out_buffer;
 	bool stream_end;
@@ -62,7 +62,7 @@ public:
 	void flush();
 
 protected:
-	virtual unsigned do_write(const char *, unsigned);
+	virtual std::size_t do_write(const char *, std::size_t);
 
 private:
 	/** Compresses data and writes it to the underlying object.  Returns true if
@@ -72,7 +72,7 @@ private:
 	bool compress_data(int flush_mode);
 
 public:
-	virtual unsigned do_read(char *, unsigned);
+	virtual std::size_t do_read(char *, std::size_t);
 
 	virtual const Handle &get_handle(Mode);
 };