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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <string.h>
#include "lib/jpegli/encode.h"
#include "lib/jpegli/error.h"
#include "lib/jpegli/memory_manager.h"
namespace jpegli {
constexpr size_t kDestBufferSize = 64 << 10;
struct StdioDestinationManager {
jpeg_destination_mgr pub;
FILE* f;
uint8_t* buffer;
static void init_destination(j_compress_ptr cinfo) {
auto dest = reinterpret_cast<StdioDestinationManager*>(cinfo->dest);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = kDestBufferSize;
}
static boolean empty_output_buffer(j_compress_ptr cinfo) {
auto dest = reinterpret_cast<StdioDestinationManager*>(cinfo->dest);
if (fwrite(dest->buffer, 1, kDestBufferSize, dest->f) != kDestBufferSize) {
JPEGLI_ERROR("Failed to write to output stream.");
}
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = kDestBufferSize;
return TRUE;
}
static void term_destination(j_compress_ptr cinfo) {
auto dest = reinterpret_cast<StdioDestinationManager*>(cinfo->dest);
size_t bytes_left = kDestBufferSize - dest->pub.free_in_buffer;
if (bytes_left &&
fwrite(dest->buffer, 1, bytes_left, dest->f) != bytes_left) {
JPEGLI_ERROR("Failed to write to output stream.");
}
fflush(dest->f);
if (ferror(dest->f)) {
JPEGLI_ERROR("Failed to write to output stream.");
}
}
};
struct MemoryDestinationManager {
jpeg_destination_mgr pub;
// Output buffer supplied by the application
uint8_t** output;
unsigned long* output_size;
// Output buffer allocated by us.
uint8_t* temp_buffer;
// Current output buffer (either application supplied or allocated by us).
uint8_t* current_buffer;
size_t buffer_size;
static void init_destination(j_compress_ptr cinfo) {}
static boolean empty_output_buffer(j_compress_ptr cinfo) {
auto dest = reinterpret_cast<MemoryDestinationManager*>(cinfo->dest);
uint8_t* next_buffer =
reinterpret_cast<uint8_t*>(malloc(dest->buffer_size * 2));
memcpy(next_buffer, dest->current_buffer, dest->buffer_size);
if (dest->temp_buffer != nullptr) {
free(dest->temp_buffer);
}
dest->temp_buffer = next_buffer;
dest->current_buffer = next_buffer;
*dest->output = next_buffer;
*dest->output_size = dest->buffer_size;
dest->pub.next_output_byte = next_buffer + dest->buffer_size;
dest->pub.free_in_buffer = dest->buffer_size;
dest->buffer_size *= 2;
return TRUE;
}
static void term_destination(j_compress_ptr cinfo) {
auto dest = reinterpret_cast<MemoryDestinationManager*>(cinfo->dest);
*dest->output_size = dest->buffer_size - dest->pub.free_in_buffer;
}
};
} // namespace jpegli
void jpegli_stdio_dest(j_compress_ptr cinfo, FILE* outfile) {
if (outfile == nullptr) {
JPEGLI_ERROR("jpegli_stdio_dest: Invalid destination.");
}
if (cinfo->dest && cinfo->dest->init_destination !=
jpegli::StdioDestinationManager::init_destination) {
JPEGLI_ERROR("jpegli_stdio_dest: a different dest manager was already set");
}
if (!cinfo->dest) {
cinfo->dest = reinterpret_cast<jpeg_destination_mgr*>(
jpegli::Allocate<jpegli::StdioDestinationManager>(cinfo, 1));
}
auto dest = reinterpret_cast<jpegli::StdioDestinationManager*>(cinfo->dest);
dest->f = outfile;
dest->buffer = jpegli::Allocate<uint8_t>(cinfo, jpegli::kDestBufferSize);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = jpegli::kDestBufferSize;
dest->pub.init_destination =
jpegli::StdioDestinationManager::init_destination;
dest->pub.empty_output_buffer =
jpegli::StdioDestinationManager::empty_output_buffer;
dest->pub.term_destination =
jpegli::StdioDestinationManager::term_destination;
}
void jpegli_mem_dest(j_compress_ptr cinfo, unsigned char** outbuffer,
unsigned long* outsize) {
if (outbuffer == nullptr || outsize == nullptr) {
JPEGLI_ERROR("jpegli_mem_dest: Invalid destination.");
}
if (cinfo->dest && cinfo->dest->init_destination !=
jpegli::MemoryDestinationManager::init_destination) {
JPEGLI_ERROR("jpegli_mem_dest: a different dest manager was already set");
}
if (!cinfo->dest) {
auto dest = jpegli::Allocate<jpegli::MemoryDestinationManager>(cinfo, 1);
dest->temp_buffer = nullptr;
cinfo->dest = reinterpret_cast<jpeg_destination_mgr*>(dest);
}
auto dest = reinterpret_cast<jpegli::MemoryDestinationManager*>(cinfo->dest);
dest->pub.init_destination =
jpegli::MemoryDestinationManager::init_destination;
dest->pub.empty_output_buffer =
jpegli::MemoryDestinationManager::empty_output_buffer;
dest->pub.term_destination =
jpegli::MemoryDestinationManager::term_destination;
dest->output = outbuffer;
dest->output_size = outsize;
if (*outbuffer == nullptr || *outsize == 0) {
dest->temp_buffer =
reinterpret_cast<uint8_t*>(malloc(jpegli::kDestBufferSize));
*outbuffer = dest->temp_buffer;
*outsize = jpegli::kDestBufferSize;
}
dest->current_buffer = *outbuffer;
dest->buffer_size = *outsize;
dest->pub.next_output_byte = dest->current_buffer;
dest->pub.free_in_buffer = dest->buffer_size;
}
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