Server : Apache/2.4.62 (Unix) OpenSSL/1.0.2k-fips System : Linux server1.richineiserver.com 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 User : fdshops ( 1003) PHP Version : 8.2.21 Disable Function : NONE Directory : /usr/local/src/libavif-0.11.1/src/ |
// Copyright 2019 Joe Drago. All rights reserved.
// SPDX-License-Identifier: BSD-2-Clause
#include "avif/internal.h"
#include <assert.h>
#include <inttypes.h>
#include <stdint.h>
#include <string.h>
// ---------------------------------------------------------------------------
// avifROStream
const uint8_t * avifROStreamCurrent(avifROStream * stream)
{
return stream->raw->data + stream->offset;
}
void avifROStreamStart(avifROStream * stream, avifROData * raw, avifDiagnostics * diag, const char * diagContext)
{
stream->raw = raw;
stream->offset = 0;
stream->diag = diag;
stream->diagContext = diagContext;
// If diag is non-NULL, diagContext must also be non-NULL
assert(!stream->diag || stream->diagContext);
}
avifBool avifROStreamHasBytesLeft(const avifROStream * stream, size_t byteCount)
{
return byteCount <= (stream->raw->size - stream->offset);
}
size_t avifROStreamRemainingBytes(const avifROStream * stream)
{
return stream->raw->size - stream->offset;
}
size_t avifROStreamOffset(const avifROStream * stream)
{
return stream->offset;
}
void avifROStreamSetOffset(avifROStream * stream, size_t offset)
{
stream->offset = offset;
if (stream->offset > stream->raw->size) {
stream->offset = stream->raw->size;
}
}
avifBool avifROStreamSkip(avifROStream * stream, size_t byteCount)
{
if (!avifROStreamHasBytesLeft(stream, byteCount)) {
avifDiagnosticsPrintf(stream->diag, "%s: Failed to skip %zu bytes, truncated data?", stream->diagContext, byteCount);
return AVIF_FALSE;
}
stream->offset += byteCount;
return AVIF_TRUE;
}
avifBool avifROStreamRead(avifROStream * stream, uint8_t * data, size_t size)
{
if (!avifROStreamHasBytesLeft(stream, size)) {
avifDiagnosticsPrintf(stream->diag, "%s: Failed to read %zu bytes, truncated data?", stream->diagContext, size);
return AVIF_FALSE;
}
memcpy(data, stream->raw->data + stream->offset, size);
stream->offset += size;
return AVIF_TRUE;
}
avifBool avifROStreamReadUX8(avifROStream * stream, uint64_t * v, uint64_t factor)
{
if (factor == 0) {
// Don't read anything, just set to 0
*v = 0;
} else if (factor == 1) {
uint8_t tmp;
AVIF_CHECK(avifROStreamRead(stream, &tmp, 1));
*v = tmp;
} else if (factor == 2) {
uint16_t tmp;
AVIF_CHECK(avifROStreamReadU16(stream, &tmp));
*v = tmp;
} else if (factor == 4) {
uint32_t tmp;
AVIF_CHECK(avifROStreamReadU32(stream, &tmp));
*v = tmp;
} else if (factor == 8) {
uint64_t tmp;
AVIF_CHECK(avifROStreamReadU64(stream, &tmp));
*v = tmp;
} else {
// Unsupported factor
avifDiagnosticsPrintf(stream->diag, "%s: Failed to read UX8 value; Unsupported UX8 factor [%" PRIu64 "]", stream->diagContext, factor);
return AVIF_FALSE;
}
return AVIF_TRUE;
}
avifBool avifROStreamReadU16(avifROStream * stream, uint16_t * v)
{
AVIF_CHECK(avifROStreamRead(stream, (uint8_t *)v, sizeof(uint16_t)));
*v = avifNTOHS(*v);
return AVIF_TRUE;
}
avifBool avifROStreamReadU16Endianness(avifROStream * stream, uint16_t * v, avifBool littleEndian)
{
AVIF_CHECK(avifROStreamRead(stream, (uint8_t *)v, sizeof(uint16_t)));
*v = littleEndian ? avifCTOHS(*v) : avifNTOHS(*v);
return AVIF_TRUE;
}
avifBool avifROStreamReadU32(avifROStream * stream, uint32_t * v)
{
AVIF_CHECK(avifROStreamRead(stream, (uint8_t *)v, sizeof(uint32_t)));
*v = avifNTOHL(*v);
return AVIF_TRUE;
}
avifBool avifROStreamReadU32Endianness(avifROStream * stream, uint32_t * v, avifBool littleEndian)
{
AVIF_CHECK(avifROStreamRead(stream, (uint8_t *)v, sizeof(uint32_t)));
*v = littleEndian ? avifCTOHL(*v) : avifNTOHL(*v);
return AVIF_TRUE;
}
avifBool avifROStreamReadU64(avifROStream * stream, uint64_t * v)
{
AVIF_CHECK(avifROStreamRead(stream, (uint8_t *)v, sizeof(uint64_t)));
*v = avifNTOH64(*v);
return AVIF_TRUE;
}
avifBool avifROStreamReadString(avifROStream * stream, char * output, size_t outputSize)
{
// Check for the presence of a null terminator in the stream.
size_t remainingBytes = avifROStreamRemainingBytes(stream);
const uint8_t * p = avifROStreamCurrent(stream);
avifBool foundNullTerminator = AVIF_FALSE;
for (size_t i = 0; i < remainingBytes; ++i) {
if (p[i] == 0) {
foundNullTerminator = AVIF_TRUE;
break;
}
}
if (!foundNullTerminator) {
avifDiagnosticsPrintf(stream->diag, "%s: Failed to find a NULL terminator when reading a string", stream->diagContext);
return AVIF_FALSE;
}
const char * streamString = (const char *)p;
size_t stringLen = strlen(streamString);
stream->offset += stringLen + 1; // update the stream to have read the "whole string" in
if (output && outputSize) {
// clamp to our output buffer
if (stringLen >= outputSize) {
stringLen = outputSize - 1;
}
memcpy(output, streamString, stringLen);
output[stringLen] = 0;
}
return AVIF_TRUE;
}
avifBool avifROStreamReadBoxHeaderPartial(avifROStream * stream, avifBoxHeader * header)
{
size_t startOffset = stream->offset;
uint32_t smallSize;
AVIF_CHECK(avifROStreamReadU32(stream, &smallSize));
AVIF_CHECK(avifROStreamRead(stream, header->type, 4));
uint64_t size = smallSize;
if (size == 1) {
AVIF_CHECK(avifROStreamReadU64(stream, &size));
}
if (!memcmp(header->type, "uuid", 4)) {
AVIF_CHECK(avifROStreamSkip(stream, 16));
}
size_t bytesRead = stream->offset - startOffset;
if ((size < bytesRead) || ((size - bytesRead) > SIZE_MAX)) {
avifDiagnosticsPrintf(stream->diag, "%s: Header size overflow check failure", stream->diagContext);
return AVIF_FALSE;
}
header->size = (size_t)(size - bytesRead);
return AVIF_TRUE;
}
avifBool avifROStreamReadBoxHeader(avifROStream * stream, avifBoxHeader * header)
{
AVIF_CHECK(avifROStreamReadBoxHeaderPartial(stream, header));
if (header->size > avifROStreamRemainingBytes(stream)) {
avifDiagnosticsPrintf(stream->diag, "%s: Child box too large, possibly truncated data", stream->diagContext);
return AVIF_FALSE;
}
return AVIF_TRUE;
}
avifBool avifROStreamReadVersionAndFlags(avifROStream * stream, uint8_t * version, uint32_t * flags)
{
uint8_t versionAndFlags[4];
AVIF_CHECK(avifROStreamRead(stream, versionAndFlags, 4));
if (version) {
*version = versionAndFlags[0];
}
if (flags) {
*flags = (versionAndFlags[1] << 16) + (versionAndFlags[2] << 8) + (versionAndFlags[3] << 0);
}
return AVIF_TRUE;
}
avifBool avifROStreamReadAndEnforceVersion(avifROStream * stream, uint8_t enforcedVersion)
{
uint8_t version;
AVIF_CHECK(avifROStreamReadVersionAndFlags(stream, &version, NULL));
if (version != enforcedVersion) {
avifDiagnosticsPrintf(stream->diag, "%s: Expecting box version %u, got version %u", stream->diagContext, enforcedVersion, version);
return AVIF_FALSE;
}
return AVIF_TRUE;
}
// ---------------------------------------------------------------------------
// avifRWStream
#define AVIF_STREAM_BUFFER_INCREMENT (1024 * 1024)
static void makeRoom(avifRWStream * stream, size_t size)
{
size_t neededSize = stream->offset + size;
size_t newSize = stream->raw->size;
while (newSize < neededSize) {
newSize += AVIF_STREAM_BUFFER_INCREMENT;
}
if (stream->raw->size != newSize) {
avifRWDataRealloc(stream->raw, newSize);
}
}
void avifRWStreamStart(avifRWStream * stream, avifRWData * raw)
{
stream->raw = raw;
stream->offset = 0;
}
size_t avifRWStreamOffset(const avifRWStream * stream)
{
return stream->offset;
}
void avifRWStreamSetOffset(avifRWStream * stream, size_t offset)
{
stream->offset = offset;
if (stream->offset > stream->raw->size) {
stream->offset = stream->raw->size;
}
}
void avifRWStreamFinishWrite(avifRWStream * stream)
{
if (stream->raw->size != stream->offset) {
if (stream->offset) {
stream->raw->size = stream->offset;
} else {
avifRWDataFree(stream->raw);
}
}
}
void avifRWStreamWrite(avifRWStream * stream, const void * data, size_t size)
{
if (!size) {
return;
}
makeRoom(stream, size);
memcpy(stream->raw->data + stream->offset, data, size);
stream->offset += size;
}
void avifRWStreamWriteChars(avifRWStream * stream, const char * chars, size_t size)
{
avifRWStreamWrite(stream, chars, size);
}
avifBoxMarker avifRWStreamWriteFullBox(avifRWStream * stream, const char * type, size_t contentSize, int version, uint32_t flags)
{
avifBoxMarker marker = stream->offset;
size_t headerSize = sizeof(uint32_t) + 4 /* size of type */;
if (version != -1) {
headerSize += 4;
}
makeRoom(stream, headerSize);
memset(stream->raw->data + stream->offset, 0, headerSize);
uint32_t noSize = avifHTONL((uint32_t)(headerSize + contentSize));
memcpy(stream->raw->data + stream->offset, &noSize, sizeof(uint32_t));
memcpy(stream->raw->data + stream->offset + 4, type, 4);
if (version != -1) {
stream->raw->data[stream->offset + 8] = (uint8_t)version;
stream->raw->data[stream->offset + 9] = (uint8_t)((flags >> 16) & 0xff);
stream->raw->data[stream->offset + 10] = (uint8_t)((flags >> 8) & 0xff);
stream->raw->data[stream->offset + 11] = (uint8_t)((flags >> 0) & 0xff);
}
stream->offset += headerSize;
return marker;
}
avifBoxMarker avifRWStreamWriteBox(avifRWStream * stream, const char * type, size_t contentSize)
{
return avifRWStreamWriteFullBox(stream, type, contentSize, -1, 0);
}
void avifRWStreamFinishBox(avifRWStream * stream, avifBoxMarker marker)
{
uint32_t noSize = avifHTONL((uint32_t)(stream->offset - marker));
memcpy(stream->raw->data + marker, &noSize, sizeof(uint32_t));
}
void avifRWStreamWriteU8(avifRWStream * stream, uint8_t v)
{
makeRoom(stream, 1);
stream->raw->data[stream->offset] = v;
stream->offset += 1;
}
void avifRWStreamWriteU16(avifRWStream * stream, uint16_t v)
{
size_t size = sizeof(uint16_t);
v = avifHTONS(v);
makeRoom(stream, size);
memcpy(stream->raw->data + stream->offset, &v, size);
stream->offset += size;
}
void avifRWStreamWriteU32(avifRWStream * stream, uint32_t v)
{
size_t size = sizeof(uint32_t);
v = avifHTONL(v);
makeRoom(stream, size);
memcpy(stream->raw->data + stream->offset, &v, size);
stream->offset += size;
}
void avifRWStreamWriteU64(avifRWStream * stream, uint64_t v)
{
size_t size = sizeof(uint64_t);
v = avifHTON64(v);
makeRoom(stream, size);
memcpy(stream->raw->data + stream->offset, &v, size);
stream->offset += size;
}
void avifRWStreamWriteZeros(avifRWStream * stream, size_t byteCount)
{
makeRoom(stream, byteCount);
uint8_t * p = stream->raw->data + stream->offset;
uint8_t * end = p + byteCount;
while (p != end) {
*p = 0;
++p;
}
stream->offset += byteCount;
}